Package mongo

ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
defer cancel()
client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://foo:bar@localhost:27017"))
if err != nil { return err }

collection := client.Database("baz").Collection("qux")

res, err := collection.InsertOne(context.Background(), bson.M{"hello": "world"})
if err != nil { return err }
id := res.InsertedID

cur, err := collection.Find(context.Background(), bson.D{})
if err != nil { log.Fatal(err) }
defer cur.Close(context.Background())
for cur.Next(context.Background()) {
  // To decode into a struct, use cursor.Decode()
  result := struct{
    Foo string
    Bar int32
  }{}
  err := cur.Decode(&result)
  if err != nil { log.Fatal(err) }
  // do something with result...

  // To get the raw bson bytes use cursor.Current
  raw := cur.Current
  // do something with raw...
}
if err := cur.Err(); err != nil {
  return err
}

var results []struct{
  Foo string
  Bar int32
}
if err = cur.All(context.Background(), &results); err != nil {
  log.Fatal(err)
}
// do something with results...

result := struct{
  Foo string
  Bar int32
}{}
filter := bson.D{{"hello", "world"}}
err := collection.FindOne(context.Background(), filter).Decode(&result)
if err != nil { return err }
// do something with result...

IsDuplicateKeyError(error)
IsNetworkError(error)
IsTimeout(error)

go build -tags cse

mkdir -p c:/libmongocrypt/bin
mkdir -p c:/libmongocrypt/include

// Run the curl command in an empty directory as it will create new directories when unpacked.
curl https://s3.amazonaws.com/mciuploads/libmongocrypt/windows/latest_release/libmongocrypt.tar.gz --output libmongocrypt.tar.gz
tar -xvzf libmongocrypt.tar.gz

cp ./bin/mongocrypt.dll c:/libmongocrypt/bin
cp ./include/mongocrypt/*.h c:/libmongocrypt/include
export PATH=$PATH:/cygdrive/c/libmongocrypt/bin

// This would have to be the same master key that was used to create the
// encryption key.
localKey := make([]byte, 96)
if _, err := rand.Read(localKey); err != nil {
    log.Fatal(err)
}
kmsProviders := map[string]map[string]interface{}{
    "local": {
        "key": localKey,
    },
}
keyVaultNamespace := "encryption.__keyVault"

uri := "mongodb://localhost:27017"
autoEncryptionOpts := options.AutoEncryption().
    SetKeyVaultNamespace(keyVaultNamespace).
    SetKmsProviders(kmsProviders)
clientOpts := options.Client().
    ApplyURI(uri).
    SetAutoEncryptionOptions(autoEncryptionOpts)
client, err := Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatalf("Connect error: %v", err)
}
defer func() {
    if err = client.Disconnect(context.TODO()); err != nil {
        log.Fatalf("Disconnect error: %v", err)
    }
}()

collection := client.Database("test").Collection("coll")
if err := collection.Drop(context.TODO()); err != nil {
    log.Fatalf("Collection.Drop error: %v", err)
}

_, err = collection.InsertOne(
    context.TODO(),
    bson.D{{"encryptedField", "123456789"}})
if err != nil {
    log.Fatalf("InsertOne error: %v", err)
}
res, err := collection.FindOne(context.TODO(), bson.D{}).Raw()
if err != nil {
    log.Fatalf("FindOne error: %v", err)
}
fmt.Println(res)

keyVaultNamespace := "encryption.__keyVault"
uri := "mongodb://localhost:27017"
// kmsProviders would have to be populated with the correct KMS provider
// information before it's used.
var kmsProviders map[string]map[string]interface{}

// Create Client and ClientEncryption
clientEncryptionOpts := options.ClientEncryption().
    SetKeyVaultNamespace(keyVaultNamespace).
    SetKmsProviders(kmsProviders)
keyVaultClient, err := Connect(
    context.TODO(),
    options.Client().ApplyURI(uri))
if err != nil {
    log.Fatalf("Connect error for keyVaultClient: %v", err)
}
clientEnc, err := NewClientEncryption(keyVaultClient, clientEncryptionOpts)
if err != nil {
    log.Fatalf("NewClientEncryption error: %v", err)
}
defer func() {
    // this will disconnect the keyVaultClient as well
    if err = clientEnc.Close(context.TODO()); err != nil {
        log.Fatalf("Close error: %v", err)
    }
}()

// Create a new data key and encode it as base64
dataKeyID, err := clientEnc.CreateDataKey(context.TODO(), "local")
if err != nil {
    log.Fatalf("CreateDataKey error: %v", err)
}
dataKeyBase64 := base64.StdEncoding.EncodeToString(dataKeyID.Data)

// Create a JSON schema using the new data key. This schema could also be
// written in a separate file and read in using I/O functions.
schema := `{
        "properties": {
            "encryptedField": {
                "encrypt": {
                    "keyId": [{
                        "$binary": {
                            "base64": "%s",
                            "subType": "04"
                        }
                    }],
                    "bsonType": "string",
                    "algorithm": "AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic"
                }
            }
        },
        "bsonType": "object"
    }`
schema = fmt.Sprintf(schema, dataKeyBase64)
var schemaDoc bson.Raw
err = bson.UnmarshalExtJSON([]byte(schema), true, &schemaDoc)
if err != nil {
    log.Fatalf("UnmarshalExtJSON error: %v", err)
}

// Configure a Client with auto encryption using the new schema
dbName := "test"
collName := "coll"
schemaMap := map[string]interface{}{
    dbName + "." + collName: schemaDoc,
}
autoEncryptionOpts := options.AutoEncryption().
    SetKmsProviders(kmsProviders).
    SetKeyVaultNamespace(keyVaultNamespace).
    SetSchemaMap(schemaMap)

clientOptions := options.Client().
    ApplyURI(uri).
    SetAutoEncryptionOptions(autoEncryptionOpts)
client, err := Connect(context.TODO(), clientOptions)
if err != nil {
    log.Fatalf("Connect error for encrypted client: %v", err)
}
defer func() {
    _ = client.Disconnect(context.TODO())
}()

// Use client for operations.

// localMasterKey must be the same master key that was used to create the
// encryption key.
var localMasterKey []byte
kmsProviders := map[string]map[string]interface{}{
    "local": {
        "key": localMasterKey,
    },
}

// The MongoDB namespace (db.collection) used to store the encryption data
// keys.
keyVaultDBName, keyVaultCollName := "encryption", "testKeyVault"
keyVaultNamespace := keyVaultDBName + "." + keyVaultCollName

// The Client used to read/write application data.
client, err := Connect(
    context.TODO(),
    options.Client().ApplyURI("mongodb://localhost:27017"))
if err != nil {
    panic(err)
}
defer func() { _ = client.Disconnect(context.TODO()) }()

// Get a handle to the application collection and clear existing data.
coll := client.Database("test").Collection("coll")
_ = coll.Drop(context.TODO())

// Set up the key vault for this example.
keyVaultColl := client.Database(keyVaultDBName).Collection(keyVaultCollName)
_ = keyVaultColl.Drop(context.TODO())
// Ensure that two data keys cannot share the same keyAltName.
keyVaultIndex := IndexModel{
    Keys: bson.D{{"keyAltNames", 1}},
    Options: options.Index().
        SetUnique(true).
        SetPartialFilterExpression(bson.D{
            {"keyAltNames", bson.D{
                {"$exists", true},
            }},
        }),
}
_, err = keyVaultColl.Indexes().CreateOne(context.TODO(), keyVaultIndex)
if err != nil {
    panic(err)
}

// Create the ClientEncryption object to use for explicit
// encryption/decryption. The Client passed to NewClientEncryption is used
// to read/write to the key vault. This can be the same Client used by the
// main application.
clientEncryptionOpts := options.ClientEncryption().
    SetKmsProviders(kmsProviders).
    SetKeyVaultNamespace(keyVaultNamespace)
clientEncryption, err := NewClientEncryption(client, clientEncryptionOpts)
if err != nil {
    panic(err)
}
defer func() { _ = clientEncryption.Close(context.TODO()) }()

// Create a new data key for the encrypted field.
dataKeyOpts := options.DataKey().
    SetKeyAltNames([]string{"go_encryption_example"})
dataKeyID, err := clientEncryption.CreateDataKey(
    context.TODO(),
    "local",
    dataKeyOpts)
if err != nil {
    panic(err)
}

// Create a bson.RawValue to encrypt and encrypt it using the key that was
// just created.
rawValueType, rawValueData, err := bson.MarshalValue("123456789")
if err != nil {
    panic(err)
}
rawValue := bson.RawValue{Type: rawValueType, Value: rawValueData}
encryptionOpts := options.Encrypt().
    SetAlgorithm("AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic").
    SetKeyID(dataKeyID)
encryptedField, err := clientEncryption.Encrypt(
    context.TODO(),
    rawValue,
    encryptionOpts)
if err != nil {
    panic(err)
}

// Insert a document with the encrypted field and then find it.
_, err = coll.InsertOne(
    context.TODO(),
    bson.D{{"encryptedField", encryptedField}})
if err != nil {
    panic(err)
}
var foundDoc bson.M
err = coll.FindOne(context.TODO(), bson.D{}).Decode(&foundDoc)
if err != nil {
    panic(err)
}

// Decrypt the encrypted field in the found document.
decrypted, err := clientEncryption.Decrypt(
    context.TODO(),
    foundDoc["encryptedField"].(primitive.Binary))
if err != nil {
    panic(err)
}
fmt.Printf("Decrypted value: %s\n", decrypted)

// Automatic encryption requires MongoDB 4.2 enterprise, but automatic
// decryption is supported for all users.

// localMasterKey must be the same master key that was used to create the
// encryption key.
var localMasterKey []byte
kmsProviders := map[string]map[string]interface{}{
    "local": {
        "key": localMasterKey,
    },
}

// The MongoDB namespace (db.collection) used to store the encryption data
// keys.
keyVaultDBName, keyVaultCollName := "encryption", "testKeyVault"
keyVaultNamespace := keyVaultDBName + "." + keyVaultCollName

// Create the Client for reading/writing application data. Configure it with
// BypassAutoEncryption=true to disable automatic encryption but keep
// automatic decryption. Setting BypassAutoEncryption will also bypass
// spawning mongocryptd in the driver.
autoEncryptionOpts := options.AutoEncryption().
    SetKmsProviders(kmsProviders).
    SetKeyVaultNamespace(keyVaultNamespace).
    SetBypassAutoEncryption(true)
clientOpts := options.Client().
    ApplyURI("mongodb://localhost:27017").
    SetAutoEncryptionOptions(autoEncryptionOpts)
client, err := Connect(context.TODO(), clientOpts)
if err != nil {
    panic(err)
}
defer func() { _ = client.Disconnect(context.TODO()) }()

// Get a handle to the application collection and clear existing data.
coll := client.Database("test").Collection("coll")
_ = coll.Drop(context.TODO())

// Set up the key vault for this example.
keyVaultColl := client.Database(keyVaultDBName).Collection(keyVaultCollName)
_ = keyVaultColl.Drop(context.TODO())
// Ensure that two data keys cannot share the same keyAltName.
keyVaultIndex := IndexModel{
    Keys: bson.D{{"keyAltNames", 1}},
    Options: options.Index().
        SetUnique(true).
        SetPartialFilterExpression(bson.D{
            {"keyAltNames", bson.D{
                {"$exists", true},
            }},
        }),
}

_, err = keyVaultColl.Indexes().CreateOne(context.TODO(), keyVaultIndex)
if err != nil {
    panic(err)
}

// Create the ClientEncryption object to use for explicit
// encryption/decryption. The Client passed to NewClientEncryption is used
// to read/write to the key vault. This can be the same Client used by the
// main application.
clientEncryptionOpts := options.ClientEncryption().
    SetKmsProviders(kmsProviders).
    SetKeyVaultNamespace(keyVaultNamespace)
clientEncryption, err := NewClientEncryption(client, clientEncryptionOpts)
if err != nil {
    panic(err)
}
defer func() { _ = clientEncryption.Close(context.TODO()) }()

// Create a new data key for the encrypted field.
dataKeyOpts := options.DataKey().
    SetKeyAltNames([]string{"go_encryption_example"})
dataKeyID, err := clientEncryption.CreateDataKey(
    context.TODO(),
    "local",
    dataKeyOpts)
if err != nil {
    panic(err)
}

// Create a bson.RawValue to encrypt and encrypt it using the key that was
// just created.
rawValueType, rawValueData, err := bson.MarshalValue("123456789")
if err != nil {
    panic(err)
}
rawValue := bson.RawValue{Type: rawValueType, Value: rawValueData}
encryptionOpts := options.Encrypt().
    SetAlgorithm("AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic").
    SetKeyID(dataKeyID)
encryptedField, err := clientEncryption.Encrypt(
    context.TODO(),
    rawValue,
    encryptionOpts)
if err != nil {
    panic(err)
}

// Insert a document with the encrypted field and then find it. The FindOne
// call will automatically decrypt the field in the document.
_, err = coll.InsertOne(
    context.TODO(),
    bson.D{{"encryptedField", encryptedField}})
if err != nil {
    panic(err)
}
var foundDoc bson.M
err = coll.FindOne(context.TODO(), bson.D{}).Decode(&foundDoc)
if err != nil {
    panic(err)
}
fmt.Printf("Decrypted document: %v\n", foundDoc)

Variables

var (
    // ErrMissingResumeToken indicates that a change stream notification from the server did not contain a resume token.
    ErrMissingResumeToken = errors.New("cannot provide resume functionality when the resume token is missing")
    // ErrNilCursor indicates that the underlying cursor for the change stream is nil.
    ErrNilCursor = errors.New("cursor is nil")
)

ErrClientDisconnected is returned when disconnected Client is used to run an operation.

var ErrClientDisconnected = errors.New("client is disconnected")

ErrEmptySlice is returned when an empty slice is passed to a CRUD method that requires a non-empty slice.

var ErrEmptySlice = errors.New("must provide at least one element in input slice")

ErrInvalidIndexValue is returned if an index is created with a keys document that has a value that is not a number or string.

var ErrInvalidIndexValue = errors.New("invalid index value")

ErrMultipleIndexDrop is returned if multiple indexes would be dropped from a call to IndexView.DropOne.

var ErrMultipleIndexDrop = errors.New("multiple indexes would be dropped")

ErrNilDocument is returned when a nil document is passed to a CRUD method.

var ErrNilDocument = errors.New("document is nil")

ErrNilValue is returned when a nil value is passed to a CRUD method.

var ErrNilValue = errors.New("value is nil")

ErrNoDocuments is returned by SingleResult methods when the operation that created the SingleResult did not return any documents.

var ErrNoDocuments = errors.New("mongo: no documents in result")

ErrNonStringIndexName is returned if an index is created with a name that is not a string.

var ErrNonStringIndexName = errors.New("index name must be a string")

ErrUnacknowledgedWrite is returned by operations that have an unacknowledged write concern.

var ErrUnacknowledgedWrite = errors.New("unacknowledged write")

ErrWrongClient is returned when a user attempts to pass in a session created by a different client than the method call is using.

var ErrWrongClient = errors.New("session was not created by this client")

func BatchCursorFromCursor ¶

func BatchCursorFromCursor(c *Cursor) *driver.BatchCursor

BatchCursorFromCursor returns a driver.BatchCursor for the given Cursor. If there is no underlying driver.BatchCursor, nil is returned.

Deprecated: This is an unstable function because the driver.BatchCursor type exists in the "x" package. Neither this function nor the driver.BatchCursor type should be used by applications and may be changed or removed in any release.

func IsDuplicateKeyError ¶

func IsDuplicateKeyError(err error) bool

IsDuplicateKeyError returns true if err is a duplicate key error.

func IsNetworkError ¶

func IsNetworkError(err error) bool

IsNetworkError returns true if err is a network error

func IsTimeout ¶

func IsTimeout(err error) bool

IsTimeout returns true if err was caused by a timeout. For error chains, IsTimeout returns true if any error in the chain was caused by a timeout.

func WithSession ¶

func WithSession(ctx context.Context, sess Session, fn func(SessionContext) error) error

WithSession creates a new SessionContext from the ctx and sess parameters and uses it to call the fn callback. The SessionContext must be used as the Context parameter for any operations in the fn callback that should be executed under the session.

WithSession is safe to call from multiple goroutines concurrently. However, the SessionContext passed to the WithSession callback function is not safe for concurrent use by multiple goroutines.

If the ctx parameter already contains a Session, that Session will be replaced with the one provided.

Any error returned by the fn callback will be returned without any modifications.

// Assume client is configured with write concern majority and read
// preference primary.
var client *mongo.Client

// Specify the DefaultReadConcern option so any transactions started through
// the session will have read concern majority.
// The DefaultReadPreference and DefaultWriteConcern options aren't
// specified so they will be inheritied from client and be set to primary
// and majority, respectively.
opts := options.Session().SetDefaultReadConcern(readconcern.Majority())
sess, err := client.StartSession(opts)
if err != nil {
    log.Fatal(err)
}
defer sess.EndSession(context.TODO())

// Call WithSession to start a transaction within the new session.
err = mongo.WithSession(
    context.TODO(),
    sess,
    func(ctx mongo.SessionContext) error {
        // Use the mongo.SessionContext as the Context parameter for
        // InsertOne and FindOne so both operations are run under the new
        // Session.

        if err := sess.StartTransaction(); err != nil {
            return err
        }

        coll := client.Database("db").Collection("coll")
        res, err := coll.InsertOne(ctx, bson.D{{"x", 1}})
        if err != nil {
            // Abort the transaction after an error. Use
            // context.Background() to ensure that the abort can complete
            // successfully even if the context passed to mongo.WithSession
            // is changed to have a timeout.
            _ = sess.AbortTransaction(context.Background())
            return err
        }

        var result bson.M
        err = coll.FindOne(
            ctx,
            bson.D{{"_id", res.InsertedID}},
        ).Decode(result)
        if err != nil {
            // Abort the transaction after an error. Use
            // context.Background() to ensure that the abort can complete
            // successfully even if the context passed to mongo.WithSession
            // is changed to have a timeout.
            _ = sess.AbortTransaction(context.Background())
            return err
        }
        fmt.Println(result)

        // Use context.Background() to ensure that the commit can complete
        // successfully even if the context passed to mongo.WithSession is
        // changed to have a timeout.
        return sess.CommitTransaction(context.Background())
    })
if err != nil {
    log.Fatal(err)
}

type BSONAppender ¶

BSONAppender is an interface implemented by types that can marshal a provided type into BSON bytes and append those bytes to the provided []byte. The AppendBSON can return a non-nil error and non-nil []byte. The AppendBSON method may also write incomplete BSON to the []byte.

Deprecated: BSONAppender is unused and will be removed in Go Driver 2.0.

type BSONAppender interface {
    AppendBSON([]byte, interface{}) ([]byte, error)
}

type BSONAppenderFunc ¶

BSONAppenderFunc is an adapter function that allows any function that satisfies the AppendBSON method signature to be used where a BSONAppender is used.

Deprecated: BSONAppenderFunc is unused and will be removed in Go Driver 2.0.

type BSONAppenderFunc func([]byte, interface{}) ([]byte, error)

func (BSONAppenderFunc) AppendBSON ¶

func (baf BSONAppenderFunc) AppendBSON(dst []byte, val interface{}) ([]byte, error)

AppendBSON implements the BSONAppender interface

Deprecated: BSONAppenderFunc is unused and will be removed in Go Driver 2.0.

type BulkWriteError ¶

BulkWriteError is an error that occurred during execution of one operation in a BulkWrite. This error type is only returned as part of a BulkWriteException.

type BulkWriteError struct {
    WriteError            // The WriteError that occurred.
    Request    WriteModel // The WriteModel that caused this error.
}

func (BulkWriteError) Error ¶

func (bwe BulkWriteError) Error() string

Error implements the error interface.

type BulkWriteException ¶

BulkWriteException is the error type returned by BulkWrite and InsertMany operations.

type BulkWriteException struct {
    // The write concern error that occurred, or nil if there was none.
    WriteConcernError *WriteConcernError

    // The write errors that occurred during operation execution.
    WriteErrors []BulkWriteError

    // The categories to which the exception belongs.
    Labels []string
}

func (BulkWriteException) Error ¶

func (bwe BulkWriteException) Error() string

Error implements the error interface.

func (BulkWriteException) HasErrorCode ¶

func (bwe BulkWriteException) HasErrorCode(code int) bool

HasErrorCode returns true if any of the errors have the specified code.

func (BulkWriteException) HasErrorCodeWithMessage ¶

func (bwe BulkWriteException) HasErrorCodeWithMessage(code int, message string) bool

HasErrorCodeWithMessage returns true if any of the contained errors have the specified code and message.

func (BulkWriteException) HasErrorLabel ¶

func (bwe BulkWriteException) HasErrorLabel(label string) bool

HasErrorLabel returns true if the error contains the specified label.

func (BulkWriteException) HasErrorMessage ¶

func (bwe BulkWriteException) HasErrorMessage(message string) bool

HasErrorMessage returns true if the error contains the specified message.

type BulkWriteResult ¶

BulkWriteResult is the result type returned by a BulkWrite operation.

type BulkWriteResult struct {
    // The number of documents inserted.
    InsertedCount int64

    // The number of documents matched by filters in update and replace operations.
    MatchedCount int64

    // The number of documents modified by update and replace operations.
    ModifiedCount int64

    // The number of documents deleted.
    DeletedCount int64

    // The number of documents upserted by update and replace operations.
    UpsertedCount int64

    // A map of operation index to the _id of each upserted document.
    UpsertedIDs map[int64]interface{}
}

type ChangeStream ¶

ChangeStream is used to iterate over a stream of events. Each event can be decoded into a Go type via the Decode method or accessed as raw BSON via the Current field. This type is not goroutine safe and must not be used concurrently by multiple goroutines. For more information about change streams, see https://www.mongodb.com/docs/manual/changeStreams/.

type ChangeStream struct {
    // Current is the BSON bytes of the current event. This property is only valid until the next call to Next or
    // TryNext. If continued access is required, a copy must be made.
    Current bson.Raw
    // contains filtered or unexported fields
}

func (*ChangeStream) Close ¶

func (cs *ChangeStream) Close(ctx context.Context) error

Close closes this change stream and the underlying cursor. Next and TryNext must not be called after Close has been called. Close is idempotent. After the first call, any subsequent calls will not change the state.

func (*ChangeStream) Decode ¶

func (cs *ChangeStream) Decode(val interface{}) error

Decode will unmarshal the current event document into val and return any errors from the unmarshalling process without any modification. If val is nil or is a typed nil, an error will be returned.

func (*ChangeStream) Err ¶

func (cs *ChangeStream) Err() error

Err returns the last error seen by the change stream, or nil if no errors has occurred.

func (*ChangeStream) ID ¶

func (cs *ChangeStream) ID() int64

ID returns the ID for this change stream, or 0 if the cursor has been closed or exhausted.

func (*ChangeStream) Next ¶

func (cs *ChangeStream) Next(ctx context.Context) bool

Next gets the next event for this change stream. It returns true if there were no errors and the next event document is available.

Next blocks until an event is available, an error occurs, or ctx expires. If ctx expires, the error will be set to ctx.Err(). In an error case, Next will return false.

If Next returns false, subsequent calls will also return false.

var stream *mongo.ChangeStream
defer stream.Close(context.TODO())

// Iterate the change stream and print out each event.
// Because the Next call blocks until an event is available, another way to
// iterate the change stream is to call Next in a goroutine and pass in a
// context that can be cancelled to abort the call.

for stream.Next(context.TODO()) {
    // A new event variable should be declared for each event.
    var event bson.M
    if err := stream.Decode(&event); err != nil {
        log.Fatal(err)
    }
    fmt.Println(event)
}
if err := stream.Err(); err != nil {
    log.Fatal(err)
}

func (*ChangeStream) ResumeToken ¶

func (cs *ChangeStream) ResumeToken() bson.Raw

ResumeToken returns the last cached resume token for this change stream, or nil if a resume token has not been stored.

var client *mongo.Client

// Assume stream was created via client.Watch()
var stream *mongo.ChangeStream

cancelCtx, cancel := context.WithCancel(context.TODO())
defer cancel()
var wg sync.WaitGroup
wg.Add(1)

// Run a goroutine to process events.
go func() {
    for stream.Next(cancelCtx) {
        fmt.Println(stream.Current)
    }
    wg.Done()
}()

// Assume client needs to be disconnected. Cancel the context being used by
// the goroutine to abort any in-progres Next calls and wait for the
// goroutine to exit.
cancel()
wg.Wait()

// Before disconnecting the client, store the last seen resume token for the
// change stream.
resumeToken := stream.ResumeToken()
_ = client.Disconnect(context.TODO())

// Once a new client is created, the change stream can be re-created.
// Specify resumeToken as the ResumeAfter option so only events that
// occurred after resumeToken will be returned.
var newClient *mongo.Client
opts := options.ChangeStream().SetResumeAfter(resumeToken)
newStream, err := newClient.Watch(context.TODO(), mongo.Pipeline{}, opts)
if err != nil {
    log.Fatal(err)
}
defer newStream.Close(context.TODO())

func (*ChangeStream) SetBatchSize ¶

func (cs *ChangeStream) SetBatchSize(size int32)

SetBatchSize sets the number of documents to fetch from the database with each iteration of the ChangeStream's "Next" or "TryNext" method. This setting only affects subsequent document batches fetched from the database.

func (*ChangeStream) TryNext ¶

func (cs *ChangeStream) TryNext(ctx context.Context) bool

TryNext attempts to get the next event for this change stream. It returns true if there were no errors and the next event document is available.

TryNext returns false if the change stream is closed by the server, an error occurs when getting changes from the server, the next change is not yet available, or ctx expires. If ctx expires, the error will be set to ctx.Err().

If TryNext returns false and an error occurred or the change stream was closed (i.e. cs.Err() != nil || cs.ID() == 0), subsequent attempts will also return false. Otherwise, it is safe to call TryNext again until a change is available.

This method requires driver version >= 1.2.0.

var stream *mongo.ChangeStream
defer stream.Close(context.TODO())

// Iterate the change stream and print out each event until the change
// stream is closed by the server or there is an error getting the next
// event.
for {
    if stream.TryNext(context.TODO()) {
        // A new event variable should be declared for each event.
        var event bson.M
        if err := stream.Decode(&event); err != nil {
            log.Fatal(err)
        }
        fmt.Println(event)
        continue
    }

    // If TryNext returns false, the next change is not yet available, the
    // change stream was closed by the server, or an error occurred. TryNext
    // should only be called again for the empty batch case.
    if err := stream.Err(); err != nil {
        log.Fatal(err)
    }
    if stream.ID() == 0 {
        break
    }
}

type Client ¶

Client is a handle representing a pool of connections to a MongoDB deployment. It is safe for concurrent use by multiple goroutines.

The Client type opens and closes connections automatically and maintains a pool of idle connections. For connection pool configuration options, see documentation for the ClientOptions type in the mongo/options package.

type Client struct {
    // contains filtered or unexported fields
}

// Create a Client and execute a ListDatabases operation.

client, err := mongo.Connect(
    context.TODO(),
    options.Client().ApplyURI("mongodb://localhost:27017"))
if err != nil {
    log.Fatal(err)
}
defer func() {
    if err = client.Disconnect(context.TODO()); err != nil {
        log.Fatal(err)
    }
}()

collection := client.Database("db").Collection("coll")
result, err := collection.InsertOne(context.TODO(), bson.D{{"x", 1}})
if err != nil {
    log.Fatal(err)
}
fmt.Printf("inserted ID: %v\n", result.InsertedID)

func Connect ¶

func Connect(ctx context.Context, opts ...*options.ClientOptions) (*Client, error)

Connect creates a new Client and then initializes it using the Connect method. This is equivalent to calling NewClient followed by Client.Connect.

When creating an options.ClientOptions, the order the methods are called matters. Later Set* methods will overwrite the values from previous Set* method invocations. This includes the ApplyURI method. This allows callers to determine the order of precedence for option application. For instance, if ApplyURI is called before SetAuth, the Credential from SetAuth will overwrite the values from the connection string. If ApplyURI is called after SetAuth, then its values will overwrite those from SetAuth.

The opts parameter is processed using options.MergeClientOptions, which will overwrite entire option fields of previous options, there is no partial overwriting. For example, if Username is set in the Auth field for the first option, and Password is set for the second but with no Username, after the merge the Username field will be empty.

The NewClient function does not do any I/O and returns an error if the given options are invalid. The Client.Connect method starts background goroutines to monitor the state of the deployment and does not do any I/O in the main goroutine to prevent the main goroutine from blocking. Therefore, it will not error if the deployment is down.

The Client.Ping method can be used to verify that the deployment is successfully connected and the Client was correctly configured.

// Configure a Client with authentication using the MONGODB-AWS
// authentication mechanism. Credentials for this mechanism can come from
// one of four sources:
//
// 1. AWS IAM credentials (an access key ID and a secret access key)
//
// 2. Temporary AWS IAM credentials
// (https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp.html)
// obtained from an AWS Security Token Service (STS) Assume Role request
// (https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html)
//
// 3. AWS Lambda environment variables
// (https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html#configuration-envvars-runtime)
//
// 4. Temporary AWS IAM credentials assigned to an EC2 instance or ECS task
// (https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-ec2.html)

// The order in which the driver searches for credentials is:
//
// 1. Credentials passed through the URI
// 2. Environment variables
// 3. ECS endpoint if and only if AWS_CONTAINER_CREDENTIALS_RELATIVE_URI is
//    set
// 4. EC2 endpoint
//
// The following examples set the appropriate credentials via the
// ClientOptions.SetAuth method. All of these credentials can be specified
// via the ClientOptions.ApplyURI method as well. If using ApplyURI, both
// the username and password must be URL encoded (see net.URL.QueryEscape())

// AWS IAM Credentials

// Applications can authenticate using AWS IAM credentials by providing a
// valid access key ID and secret access key pair as the username and
// password, respectively.
var accessKeyID, secretAccessKey string
awsCredential := options.Credential{
    AuthMechanism: "MONGODB-AWS",
    Username:      accessKeyID,
    Password:      secretAccessKey,
}
awsIAMClient, err := mongo.Connect(
    context.TODO(),
    options.Client().SetAuth(awsCredential))
if err != nil {
    panic(err)
}
_ = awsIAMClient

// AssumeRole

// Applications can authenticate using temporary credentials returned from
// an assume role request. These temporary credentials consist of an access
// key ID, a secret access key, and a security token.
var sessionToken string
assumeRoleCredential := options.Credential{
    AuthMechanism: "MONGODB-AWS",
    Username:      accessKeyID,
    Password:      secretAccessKey,
    AuthMechanismProperties: map[string]string{
        "AWS_SESSION_TOKEN": sessionToken,
    },
}
assumeRoleClient, err := mongo.Connect(
    context.TODO(),
    options.Client().SetAuth(assumeRoleCredential))
if err != nil {
    panic(err)
}
_ = assumeRoleClient

// AWS Lambda (Environment Variables)

// When the username and password are not provided and the MONGODB-AWS
// mechanism is set, the client will fallback to using the environment
// variables AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, and AWS_SESSION_TOKEN
// for the access key ID, secret access key, and session token,
// respectively. These environment variables must not be URL encoded.

// $ export AWS_ACCESS_KEY_ID=<accessKeyID>
// $ export AWS_SECRET_ACCESS_KEY=<secretAccessKey>
// $ export AWS_SESSION_TOKEN=<sessionToken>
envVariablesCredential := options.Credential{
    AuthMechanism: "MONGODB-AWS",
}
envVariablesClient, err := mongo.Connect(
    context.TODO(),
    options.Client().SetAuth(envVariablesCredential))
if err != nil {
    panic(err)
}
_ = envVariablesClient

// ECS Container or EC2 Instance

// Applications can authenticate from an ECS container or EC2 instance via
// temporary credentials assigned to the machine. If using an ECS container,
// the "AWS_CONTAINER_CREDENTIALS_RELATIVE_URI" environment variable must be
// set to a non-empty value. The driver will query the ECS or EC2 endpoint
// to obtain the relevant credentials.
ecCredential := options.Credential{
    AuthMechanism: "MONGODB-AWS",
}
ecClient, err := mongo.Connect(
    context.TODO(),
    options.Client().SetAuth(ecCredential))
if err != nil {
    panic(err)
}
_ = ecClient

// Configure a client that customizes the BSON marshal and unmarshal
// behavior.

// Specify BSON options that cause the driver to fallback to "json"
// struct tags if "bson" struct tags are missing, marshal nil Go maps as
// empty BSON documents, and marshals nil Go slices as empty BSON
// arrays.
bsonOpts := &options.BSONOptions{
    UseJSONStructTags: true,
    NilMapAsEmpty:     true,
    NilSliceAsEmpty:   true,
}

clientOpts := options.Client().
    ApplyURI("mongodb://localhost:27017").
    SetBSONOptions(bsonOpts)

client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    panic(err)
}
defer func() {
    if err := client.Disconnect(context.TODO()); err != nil {
        panic(err)
    }
}()

coll := client.Database("db").Collection("coll")

// Define a struct that contains a map and a slice and uses "json" struct
// tags to specify field names.
type myDocument struct {
    MyMap   map[string]interface{} `json:"a"`
    MySlice []string               `json:"b"`
}

// Insert an instance of the struct with all empty fields. Expect the
// resulting BSON document to have a structure like {"a": {}, "b": []}
_, err = coll.InsertOne(context.TODO(), myDocument{})
if err != nil {
    panic(err)
}

// Create a direct connection to a host. The driver will send all requests
// to that host and will not automatically discover other hosts in the
// deployment.

clientOpts := options.Client().ApplyURI(
    "mongodb://localhost:27017/?connect=direct")
client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

// Configure a Client with GSSAPI/SSPI authentication (https://www.mongodb.com/docs/manual/core/kerberos/).
// MongoDB Enterprise supports proxy authentication through a Kerberos
// service. Using Kerberos authentication requires the "gssapi" build tag
// and cgo support during compilation. The default service name for Kerberos
// is "mongodb". This can be configured via the AuthMechanismProperties
// field in the options.Credential struct or the authMechanismProperties URI
// parameter.

// For Linux, the libkrb5 library is required.
// Users can authenticate in one of two ways:
// 1. Use an explicit password. In this case, a password must be specified
// in the URI or the options.Credential struct and no further setup is
// required.
// 2. Store authentication keys in keytab files. To do this, the kinit
// binary should be used to initialize a credential cache for authenticating
// the user principal. In this example, the invocation would be
// "kinit drivers@KERBEROS.EXAMPLE.COM".

// To configure auth via a URI instead of a Credential, use
// "mongodb://drivers%40KERBEROS.EXAMPLE.COM@mongo-server.example.com:27017/?authMechanism=GSSAPI".
credential := options.Credential{
    AuthMechanism: "GSSAPI",
    Username:      "drivers@KERBEROS.EXAMPLE.COM",
}
uri := "mongo-server.example.com:27017"
clientOpts := options.Client().ApplyURI(uri).SetAuth(credential)

client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

// Configure a Client with LDAP authentication
// (https://www.mongodb.com/docs/manual/core/authentication-mechanisms-enterprise/#security-auth-ldap).
// MongoDB Enterprise supports proxy authentication through an LDAP service
// that can be used through the PLAIN authentication mechanism.
// This auth mechanism sends the password in plaintext and therefore should
// only be used with TLS connections.

// To configure auth via a URI instead of a Credential, use
// "mongodb://ldap-user:ldap-pwd@localhost:27017/?authMechanism=PLAIN".
credential := options.Credential{
    AuthMechanism: "PLAIN",
    Username:      "ldap-user",
    Password:      "ldap-pwd",
}
clientOpts := options.Client().ApplyURI("mongodb://localhost:27017").
    SetAuth(credential)

client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

// Create a Client to a MongoDB server and use Ping to verify that the
// server is running.

clientOpts := options.Client().ApplyURI("mongodb://localhost:27017")
client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
defer func() {
    if err = client.Disconnect(context.TODO()); err != nil {
        log.Fatal(err)
    }
}()

// Call Ping to verify that the deployment is up and the Client was
// configured successfully. As mentioned in the Ping documentation, this
// reduces application resiliency as the server may be temporarily
// unavailable when Ping is called.
if err = client.Ping(context.TODO(), readpref.Primary()); err != nil {
    log.Fatal(err)
}

// Create and connect a Client to a replica set deployment.
// Given this URI, the Go driver will first communicate with localhost:27017
// and use the response to discover any other members in the replica set.
// The URI in this example specifies multiple members of the replica set to
// increase resiliency as one of the members may be down when the
// application is started.

clientOpts := options.Client().ApplyURI(
    "mongodb://localhost:27017,localhost:27018/?replicaSet=replset")
client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

// Configure a Client with SCRAM authentication
// (https://www.mongodb.com/docs/manual/core/security-scram/).
// The default authentication database for SCRAM is "admin". This can be
// configured via the authSource query parameter in the URI or the
// AuthSource field in the options.Credential struct. SCRAM is the default
// auth mechanism so specifying a mechanism is not required.

// To configure auth via URI instead of a Credential, use
// "mongodb://user:password@localhost:27017".
credential := options.Credential{
    Username: "user",
    Password: "password",
}
clientOpts := options.Client().ApplyURI("mongodb://localhost:27017").
    SetAuth(credential)
client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

// Create and connect a Client using an SRV record.
// SRV records allow administrators to configure a single domain to return a
// list of host names. The driver will resolve SRV records prefixed with
// "_mongodb_tcp" and use the returned host names to build its view of the
// deployment.
// See https://www.mongodb.com/docs/manual/reference/connection-string/ for more
// information about SRV. Full support for SRV records with sharded clusters
// requires driver version 1.1.0 or higher.

clientOpts := options.Client().ApplyURI("mongodb+srv://mongodb.example.com")
client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

// Create and connect a Client to a sharded deployment.
// The URI for a sharded deployment should specify the mongos servers that
// the application wants to send messages to.

clientOpts := options.Client().ApplyURI(
    "mongodb://localhost:27017,localhost:27018")
client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

// Configure a Client with stable API.
//
// Stable API is a new feature in MongoDB 5.0 that allows user-selectable
// API versions, subsets of MongoDB server semantics, to be declared on a
// Client. During communication with a server, Clients with a declared API
// version will force that server to behave in a manner compatible with the
// API version. Declaring an API version on your Client can be used to
// ensure consistent responses from a server, providing long term API
// stability for an application.
//
// The declared API version is applied to all commands run through the
// Client, including those sent through the generic RunCommand helper.
// Specifying stable API options in the command document AND declaring
// an API version on the Client is not supported and will lead to undefined
// behavior. To run any command with a different API version or without
// declaring one, create a separate Client that declares the appropriate API
// version.

// ServerAPIOptions must be declared with an API version. ServerAPIVersion1
// is a constant equal to "1".
serverAPI := options.ServerAPI(options.ServerAPIVersion1)
serverAPIClient, err := mongo.Connect(
    context.TODO(),
    options.Client().SetServerAPIOptions(serverAPI))
if err != nil {
    panic(err)
}
_ = serverAPIClient

// ServerAPIOptions can be declared with a Strict option. Declaring a strict
// API version will cause the MongoDB server to reject all commands that are
// not part of the declared API version. This includes command options and
// aggregation pipeline stages. For example, the following Distinct call
// would fail because the distinct command is not part of API version 1:
serverAPIStrict := options.ServerAPI(options.ServerAPIVersion1).
    SetStrict(true)
serverAPIStrictClient, err := mongo.Connect(
    context.TODO(),
    options.Client().SetServerAPIOptions(serverAPIStrict))
if err != nil {
    panic(err)
}

coll := serverAPIStrictClient.Database("db").Collection("coll")
// Fails with error: (APIStrictError) Provided apiStrict:true, but the
// command distinct is not in API Version 1
_, err = coll.Distinct(context.TODO(), "distinct", bson.D{})
log.Println(err)

// ServerAPIOptions can be declared with a DeprecationErrors option.
// DeprecationErrors can be used to enable command failures when using
// functionality that is deprecated in the declared API version. Note that
// at the time of this writing, no deprecations in API version 1 exist.
serverAPIDeprecation := options.ServerAPI(options.ServerAPIVersion1).
    SetDeprecationErrors(true)
serverAPIDeprecationClient, err := mongo.Connect(
    context.TODO(),
    options.Client().SetServerAPIOptions(serverAPIDeprecation))
if err != nil {
    panic(err)
}
_ = serverAPIDeprecationClient

// Configure a Client with X509 authentication
// (https://www.mongodb.com/docs/manual/core/security-x.509/).

// X509 can be configured with different sets of options in the connection
// string:
// 1. tlsCAFile (or SslCertificateAuthorityFile): Path to the file with
// either a single or bundle of certificate authorities to be considered
// trusted when making a TLS connection.
// 2. tlsCertificateKeyFile (or SslClientCertificateKeyFile): Path to the
// client certificate file or the client private key file. In the case that
// both are needed, the files should be concatenated.

// The SetAuth client option should also be used. The username field is
// optional. If it is not specified, it will be extracted from the
// certificate key file. The AuthSource is required to be $external.

caFilePath := "path/to/cafile"
certificateKeyFilePath := "path/to/client-certificate"

// To configure auth via a URI instead of a Credential, append
// "&authMechanism=MONGODB-X509" to the URI.
uri := "mongodb://host:port/?tlsCAFile=%s&tlsCertificateKeyFile=%s"
uri = fmt.Sprintf(uri, caFilePath, certificateKeyFilePath)
credential := options.Credential{
    AuthMechanism: "MONGODB-X509",
}
clientOpts := options.Client().ApplyURI(uri).SetAuth(credential)

client, err := mongo.Connect(context.TODO(), clientOpts)
if err != nil {
    log.Fatal(err)
}
_ = client

func NewClient ¶

func NewClient(opts ...*options.ClientOptions) (*Client, error)

NewClient creates a new client to connect to a deployment specified by the uri.

When creating an options.ClientOptions, the order the methods are called matters. Later Set* methods will overwrite the values from previous Set* method invocations. This includes the ApplyURI method. This allows callers to determine the order of precedence for option application. For instance, if ApplyURI is called before SetAuth, the Credential from SetAuth will overwrite the values from the connection string. If ApplyURI is called after SetAuth, then its values will overwrite those from SetAuth.

The opts parameter is processed using options.MergeClientOptions, which will overwrite entire option fields of previous options, there is no partial overwriting. For example, if Username is set in the Auth field for the first option, and Password is set for the second but with no Username, after the merge the Username field will be empty.

Deprecated: Use Connect instead.

func (*Client) Connect ¶

func (c *Client) Connect(ctx context.Context) error

Connect initializes the Client by starting background monitoring goroutines. If the Client was created using the NewClient function, this method must be called before a Client can be used.

Connect starts background goroutines to monitor the state of the deployment and does not do any I/O in the main goroutine. The Client.Ping method can be used to verify that the connection was created successfully.

Deprecated: Use mongo.Connect instead.

func (*Client) Database ¶

func (c *Client) Database(name string, opts ...*options.DatabaseOptions) *Database

Database returns a handle for a database with the given name configured with the given DatabaseOptions.

func (*Client) Disconnect ¶

func (c *Client) Disconnect(ctx context.Context) error

Disconnect closes sockets to the topology referenced by this Client. It will shut down any monitoring goroutines, close the idle connection pool, and will wait until all the in use connections have been returned to the connection pool and closed before returning. If the context expires via cancellation, deadline, or timeout before the in use connections have returned, the in use connections will be closed, resulting in the failure of any in flight read or write operations. If this method returns with no errors, all connections associated with this Client have been closed.

func (*Client) ListDatabaseNames ¶

func (c *Client) ListDatabaseNames(ctx context.Context, filter interface{}, opts ...*options.ListDatabasesOptions) ([]string, error)

ListDatabaseNames executes a listDatabases command and returns a slice containing the names of all of the databases on the server.

The filter parameter must be a document containing query operators and can be used to select which databases are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include all databases.

The opts parameter can be used to specify options for this operation (see the options.ListDatabasesOptions documentation.)

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listDatabases/.

var client *mongo.Client

// Use a filter to only select non-empty databases.
result, err := client.ListDatabaseNames(
    context.TODO(),
    bson.D{{"empty", false}})
if err != nil {
    log.Fatal(err)
}

for _, db := range result {
    fmt.Println(db)
}

func (*Client) ListDatabases ¶

func (c *Client) ListDatabases(ctx context.Context, filter interface{}, opts ...*options.ListDatabasesOptions) (ListDatabasesResult, error)

ListDatabases executes a listDatabases command and returns the result.

The filter parameter must be a document containing query operators and can be used to select which databases are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include all databases.

The opts parameter can be used to specify options for this operation (see the options.ListDatabasesOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listDatabases/.

func (*Client) NumberSessionsInProgress ¶

func (c *Client) NumberSessionsInProgress() int

NumberSessionsInProgress returns the number of sessions that have been started for this client but have not been closed (i.e. EndSession has not been called).

func (*Client) Ping ¶

func (c *Client) Ping(ctx context.Context, rp *readpref.ReadPref) error

Ping sends a ping command to verify that the client can connect to the deployment.

The rp parameter is used to determine which server is selected for the operation. If it is nil, the client's read preference is used.

If the server is down, Ping will try to select a server until the client's server selection timeout expires. This can be configured through the ClientOptions.SetServerSelectionTimeout option when creating a new Client. After the timeout expires, a server selection error is returned.

Using Ping reduces application resilience because applications starting up will error if the server is temporarily unavailable or is failing over (e.g. during autoscaling due to a load spike).

func (*Client) StartSession ¶

func (c *Client) StartSession(opts ...*options.SessionOptions) (Session, error)

StartSession starts a new session configured with the given options.

StartSession does not actually communicate with the server and will not error if the client is disconnected.

StartSession is safe to call from multiple goroutines concurrently. However, Sessions returned by StartSession are not safe for concurrent use by multiple goroutines.

If the DefaultReadConcern, DefaultWriteConcern, or DefaultReadPreference options are not set, the client's read concern, write concern, or read preference will be used, respectively.

// Assume client is configured with write concern majority and read
// preference primary.
var client *mongo.Client

// Specify the DefaultReadConcern option so any transactions started through
// the session will have read concern majority.
// The DefaultReadPreference and DefaultWriteConcern options aren't
// specified so they will be inheritied from client and be set to primary
// and majority, respectively.
opts := options.Session().SetDefaultReadConcern(readconcern.Majority())
sess, err := client.StartSession(opts)
if err != nil {
    log.Fatal(err)
}
defer sess.EndSession(context.TODO())

// Specify the ReadPreference option to set the read preference to primary
// preferred for this transaction.
txnOpts := options.Transaction().
    SetReadPreference(readpref.PrimaryPreferred())
result, err := sess.WithTransaction(
    context.TODO(),
    func(ctx mongo.SessionContext) (interface{}, error) {
        // Use the mongo.SessionContext as the Context parameter for
        // InsertOne and FindOne so both operations are run in the same
        // transaction.

        coll := client.Database("db").Collection("coll")
        res, err := coll.InsertOne(ctx, bson.D{{"x", 1}})
        if err != nil {
            return nil, err
        }

        var result bson.M
        err = coll.FindOne(
            ctx,
            bson.D{{"_id", res.InsertedID}},
        ).Decode(result)
        if err != nil {
            return nil, err
        }
        return result, err
    },
    txnOpts)
if err != nil {
    log.Fatal(err)
}
fmt.Printf("result: %v\n", result)

func (*Client) Timeout ¶

func (c *Client) Timeout() *time.Duration

Timeout returns the timeout set for this client.

func (*Client) UseSession ¶

func (c *Client) UseSession(ctx context.Context, fn func(SessionContext) error) error

UseSession creates a new Session and uses it to create a new SessionContext, which is used to call the fn callback. The SessionContext parameter must be used as the Context parameter for any operations in the fn callback that should be executed under a session. After the callback returns, the created Session is ended, meaning that any in-progress transactions started by fn will be aborted even if fn returns an error.

UseSession is safe to call from multiple goroutines concurrently. However, the SessionContext passed to the UseSession callback function is not safe for concurrent use by multiple goroutines.

If the ctx parameter already contains a Session, that Session will be replaced with the newly created one.

Any error returned by the fn callback will be returned without any modifications.

func (*Client) UseSessionWithOptions ¶

func (c *Client) UseSessionWithOptions(ctx context.Context, opts *options.SessionOptions, fn func(SessionContext) error) error

UseSessionWithOptions operates like UseSession but uses the given SessionOptions to create the Session.

UseSessionWithOptions is safe to call from multiple goroutines concurrently. However, the SessionContext passed to the UseSessionWithOptions callback function is not safe for concurrent use by multiple goroutines.

var client *mongo.Client

// Specify the DefaultReadConcern option so any transactions started through
// the session will have read concern majority.
// The DefaultReadPreference and DefaultWriteConcern options aren't
// specified so they will be inheritied from client and be set to primary
// and majority, respectively.
opts := options.Session().SetDefaultReadConcern(readconcern.Majority())
err := client.UseSessionWithOptions(
    context.TODO(),
    opts,
    func(ctx mongo.SessionContext) error {
        // Use the mongo.SessionContext as the Context parameter for
        // InsertOne and FindOne so both operations are run under the new
        // Session.

        if err := ctx.StartTransaction(); err != nil {
            return err
        }

        coll := client.Database("db").Collection("coll")
        res, err := coll.InsertOne(ctx, bson.D{{"x", 1}})
        if err != nil {
            // Abort the transaction after an error. Use
            // context.Background() to ensure that the abort can complete
            // successfully even if the context passed to mongo.WithSession
            // is changed to have a timeout.
            _ = ctx.AbortTransaction(context.Background())
            return err
        }

        var result bson.M
        err = coll.FindOne(
            ctx,
            bson.D{{"_id", res.InsertedID}},
        ).Decode(result)
        if err != nil {
            // Abort the transaction after an error. Use
            // context.Background() to ensure that the abort can complete
            // successfully even if the context passed to mongo.WithSession
            // is changed to have a timeout.
            _ = ctx.AbortTransaction(context.Background())
            return err
        }
        fmt.Println(result)

        // Use context.Background() to ensure that the commit can complete
        // successfully even if the context passed to mongo.WithSession is
        // changed to have a timeout.
        return ctx.CommitTransaction(context.Background())
    })
if err != nil {
    log.Fatal(err)
}

func (*Client) Watch ¶

func (c *Client) Watch(ctx context.Context, pipeline interface{},
    opts ...*options.ChangeStreamOptions) (*ChangeStream, error)

Watch returns a change stream for all changes on the deployment. See https://www.mongodb.com/docs/manual/changeStreams/ for more information about change streams.

The client must be configured with read concern majority or no read concern for a change stream to be created successfully.

The pipeline parameter must be an array of documents, each representing a pipeline stage. The pipeline cannot be nil or empty. The stage documents must all be non-nil. See https://www.mongodb.com/docs/manual/changeStreams/ for a list of pipeline stages that can be used with change streams. For a pipeline of bson.D documents, the mongo.Pipeline{} type can be used.

The opts parameter can be used to specify options for change stream creation (see the options.ChangeStreamOptions documentation).

var client *mongo.Client

// Specify a pipeline that will only match "insert" events.
// Specify the MaxAwaitTimeOption to have each attempt wait two seconds for
// new documents.
matchStage := bson.D{{"$match", bson.D{{"operationType", "insert"}}}}
opts := options.ChangeStream().SetMaxAwaitTime(2 * time.Second)
changeStream, err := client.Watch(
    context.TODO(),
    mongo.Pipeline{matchStage},
    opts)
if err != nil {
    log.Fatal(err)
}

// Print out all change stream events in the order they're received.
// See the mongo.ChangeStream documentation for more examples of using
// change streams.
for changeStream.Next(context.TODO()) {
    fmt.Println(changeStream.Current)
}

type ClientEncryption ¶

ClientEncryption is used to create data keys and explicitly encrypt and decrypt BSON values.

type ClientEncryption struct {
    // contains filtered or unexported fields
}

func NewClientEncryption ¶

func NewClientEncryption(keyVaultClient *Client, opts ...*options.ClientEncryptionOptions) (*ClientEncryption, error)

NewClientEncryption creates a new ClientEncryption instance configured with the given options.

func (*ClientEncryption) AddKeyAltName ¶

func (ce *ClientEncryption) AddKeyAltName(ctx context.Context, id primitive.Binary, keyAltName string) *SingleResult

AddKeyAltName adds a keyAltName to the keyAltNames array of the key document in the key vault collection with the given UUID (BSON binary subtype 0x04). Returns the previous version of the key document.

func (*ClientEncryption) Close ¶

func (ce *ClientEncryption) Close(ctx context.Context) error

Close cleans up any resources associated with the ClientEncryption instance. This includes disconnecting the key-vault Client instance.

func (*ClientEncryption) CreateDataKey ¶

func (ce *ClientEncryption) CreateDataKey(ctx context.Context, kmsProvider string,
    opts ...*options.DataKeyOptions) (primitive.Binary, error)

CreateDataKey creates a new key document and inserts into the key vault collection. Returns the _id of the created document as a UUID (BSON binary subtype 0x04).

func (*ClientEncryption) CreateEncryptedCollection ¶

func (ce *ClientEncryption) CreateEncryptedCollection(ctx context.Context,
    db *Database, coll string, createOpts *options.CreateCollectionOptions,
    kmsProvider string, masterKey interface{}) (*Collection, bson.M, error)

CreateEncryptedCollection creates a new collection for Queryable Encryption with the help of automatic generation of new encryption data keys for null keyIds. It returns the created collection and the encrypted fields document used to create it.

func (*ClientEncryption) Decrypt ¶

func (ce *ClientEncryption) Decrypt(ctx context.Context, val primitive.Binary) (bson.RawValue, error)

Decrypt decrypts an encrypted value (BSON binary of subtype 6) and returns the original BSON value.

func (*ClientEncryption) DeleteKey ¶

func (ce *ClientEncryption) DeleteKey(ctx context.Context, id primitive.Binary) (*DeleteResult, error)

DeleteKey removes the key document with the given UUID (BSON binary subtype 0x04) from the key vault collection. Returns the result of the internal deleteOne() operation on the key vault collection.

func (*ClientEncryption) Encrypt ¶

func (ce *ClientEncryption) Encrypt(ctx context.Context, val bson.RawValue,
    opts ...*options.EncryptOptions) (primitive.Binary, error)

Encrypt encrypts a BSON value with the given key and algorithm. Returns an encrypted value (BSON binary of subtype 6).

func (*ClientEncryption) EncryptExpression ¶

func (ce *ClientEncryption) EncryptExpression(ctx context.Context, expr interface{}, result interface{}, opts ...*options.EncryptOptions) error

EncryptExpression encrypts an expression to query a range index. On success, `result` is populated with the resulting BSON document. `expr` is expected to be a BSON document of one of the following forms: 1. A Match Expression of this form: {$and: [{<field>: {$gt: <value1>}}, {<field>: {$lt: <value2> }}]} 2. An Aggregate Expression of this form: {$and: [{$gt: [<fieldpath>, <value1>]}, {$lt: [<fieldpath>, <value2>]}] $gt may also be $gte. $lt may also be $lte. Only supported for queryType "rangePreview" Beta: The Range algorithm is experimental only. It is not intended for public use. It is subject to breaking changes.

func (*ClientEncryption) GetKey ¶

func (ce *ClientEncryption) GetKey(ctx context.Context, id primitive.Binary) *SingleResult

GetKey finds a single key document with the given UUID (BSON binary subtype 0x04). Returns the result of the internal find() operation on the key vault collection.

func (*ClientEncryption) GetKeyByAltName ¶

func (ce *ClientEncryption) GetKeyByAltName(ctx context.Context, keyAltName string) *SingleResult

GetKeyByAltName returns a key document in the key vault collection with the given keyAltName.

func (*ClientEncryption) GetKeys ¶

func (ce *ClientEncryption) GetKeys(ctx context.Context) (*Cursor, error)

GetKeys finds all documents in the key vault collection. Returns the result of the internal find() operation on the key vault collection.

func (*ClientEncryption) RemoveKeyAltName ¶

func (ce *ClientEncryption) RemoveKeyAltName(ctx context.Context, id primitive.Binary, keyAltName string) *SingleResult

RemoveKeyAltName removes a keyAltName from the keyAltNames array of the key document in the key vault collection with the given UUID (BSON binary subtype 0x04). Returns the previous version of the key document.

func (*ClientEncryption) RewrapManyDataKey ¶

func (ce *ClientEncryption) RewrapManyDataKey(ctx context.Context, filter interface{},
    opts ...*options.RewrapManyDataKeyOptions) (*RewrapManyDataKeyResult, error)

RewrapManyDataKey decrypts and encrypts all matching data keys with a possibly new masterKey value. For all matching documents, this method will overwrite the "masterKey", "updateDate", and "keyMaterial". On error, some matching data keys may have been rewrapped. libmongocrypt 1.5.2 is required. An error is returned if the detected version of libmongocrypt is less than 1.5.2.

type Collection ¶

Collection is a handle to a MongoDB collection. It is safe for concurrent use by multiple goroutines.

type Collection struct {
    // contains filtered or unexported fields
}

func (*Collection) Aggregate ¶

func (coll *Collection) Aggregate(ctx context.Context, pipeline interface{},
    opts ...*options.AggregateOptions) (*Cursor, error)

Aggregate executes an aggregate command against the collection and returns a cursor over the resulting documents.

The pipeline parameter must be an array of documents, each representing an aggregation stage. The pipeline cannot be nil but can be empty. The stage documents must all be non-nil. For a pipeline of bson.D documents, the mongo.Pipeline type can be used. See https://www.mongodb.com/docs/manual/reference/operator/aggregation-pipeline/#db-collection-aggregate-stages for a list of valid stages in aggregations.

The opts parameter can be used to specify options for the operation (see the options.AggregateOptions documentation.)

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/aggregate/.

var coll *mongo.Collection

// Specify a pipeline that will return the number of times each name appears
// in the collection.
// Specify the MaxTime option to limit the amount of time the operation can
// run on the server.
groupStage := bson.D{
    {"$group", bson.D{
        {"_id", "$name"},
        {"numTimes", bson.D{
            {"$sum", 1},
        }},
    }},
}
opts := options.Aggregate().SetMaxTime(2 * time.Second)
cursor, err := coll.Aggregate(
    context.TODO(),
    mongo.Pipeline{groupStage},
    opts)
if err != nil {
    log.Fatal(err)
}

// Get a list of all returned documents and print them out.
// See the mongo.Cursor documentation for more examples of using cursors.
var results []bson.M
if err = cursor.All(context.TODO(), &results); err != nil {
    log.Fatal(err)
}
for _, result := range results {
    fmt.Printf(
        "name %v appears %v times\n",
        result["_id"],
        result["numTimes"])
}

func (*Collection) BulkWrite ¶

func (coll *Collection) BulkWrite(ctx context.Context, models []WriteModel,
    opts ...*options.BulkWriteOptions) (*BulkWriteResult, error)

BulkWrite performs a bulk write operation (https://www.mongodb.com/docs/manual/core/bulk-write-operations/).

The models parameter must be a slice of operations to be executed in this bulk write. It cannot be nil or empty. All of the models must be non-nil. See the mongo.WriteModel documentation for a list of valid model types and examples of how they should be used.

The opts parameter can be used to specify options for the operation (see the options.BulkWriteOptions documentation.)

var coll *mongo.Collection
var firstID, secondID primitive.ObjectID

// Update the "email" field for two users.
// For each update, specify the Upsert option to insert a new document if a
// document matching the filter isn't found.
// Set the Ordered option to false to allow both operations to happen even
// if one of them errors.
firstUpdate := bson.D{
    {"$set", bson.D{
        {"email", "firstEmail@example.com"},
    }},
}
secondUpdate := bson.D{
    {"$set", bson.D{
        {"email", "secondEmail@example.com"},
    }},
}
models := []mongo.WriteModel{
    mongo.NewUpdateOneModel().SetFilter(bson.D{{"_id", firstID}}).
        SetUpdate(firstUpdate).SetUpsert(true),
    mongo.NewUpdateOneModel().SetFilter(bson.D{{"_id", secondID}}).
        SetUpdate(secondUpdate).SetUpsert(true),
}
opts := options.BulkWrite().SetOrdered(false)
res, err := coll.BulkWrite(context.TODO(), models, opts)
if err != nil {
    log.Fatal(err)
}

fmt.Printf(
    "inserted %v and deleted %v documents\n",
    res.InsertedCount,
    res.DeletedCount)

func (*Collection) Clone ¶

func (coll *Collection) Clone(opts ...*options.CollectionOptions) (*Collection, error)

Clone creates a copy of the Collection configured with the given CollectionOptions. The specified options are merged with the existing options on the collection, with the specified options taking precedence.

func (*Collection) CountDocuments ¶

func (coll *Collection) CountDocuments(ctx context.Context, filter interface{},
    opts ...*options.CountOptions) (int64, error)

CountDocuments returns the number of documents in the collection. For a fast count of the documents in the collection, see the EstimatedDocumentCount method.

The filter parameter must be a document and can be used to select which documents contribute to the count. It cannot be nil. An empty document (e.g. bson.D{}) should be used to count all documents in the collection. This will result in a full collection scan.

The opts parameter can be used to specify options for the operation (see the options.CountOptions documentation).

var coll *mongo.Collection

// Count the number of times the name "Bob" appears in the collection.
// Specify the MaxTime option to limit the amount of time the operation can
// run on the server.
opts := options.Count().SetMaxTime(2 * time.Second)
count, err := coll.CountDocuments(
    context.TODO(),
    bson.D{{"name", "Bob"}},
    opts)
if err != nil {
    log.Fatal(err)
}
fmt.Printf("name Bob appears in %v documents", count)

func (*Collection) Database ¶

func (coll *Collection) Database() *Database

Database returns the Database that was used to create the Collection.

func (*Collection) DeleteMany ¶

func (coll *Collection) DeleteMany(ctx context.Context, filter interface{},
    opts ...*options.DeleteOptions) (*DeleteResult, error)

DeleteMany executes a delete command to delete documents from the collection.

The filter parameter must be a document containing query operators and can be used to select the documents to be deleted. It cannot be nil. An empty document (e.g. bson.D{}) should be used to delete all documents in the collection. If the filter does not match any documents, the operation will succeed and a DeleteResult with a DeletedCount of 0 will be returned.

The opts parameter can be used to specify options for the operation (see the options.DeleteOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/delete/.

var coll *mongo.Collection

// Delete all documents in which the "name" field is "Bob" or "bob".
// Specify the Collation option to provide a collation that will ignore case
// for string comparisons.
opts := options.Delete().SetCollation(&options.Collation{
    Locale:    "en_US",
    Strength:  1,
    CaseLevel: false,
})
res, err := coll.DeleteMany(context.TODO(), bson.D{{"name", "bob"}}, opts)
if err != nil {
    log.Fatal(err)
}
fmt.Printf("deleted %v documents\n", res.DeletedCount)

func (*Collection) DeleteOne ¶

func (coll *Collection) DeleteOne(ctx context.Context, filter interface{},
    opts ...*options.DeleteOptions) (*DeleteResult, error)

DeleteOne executes a delete command to delete at most one document from the collection.

The filter parameter must be a document containing query operators and can be used to select the document to be deleted. It cannot be nil. If the filter does not match any documents, the operation will succeed and a DeleteResult with a DeletedCount of 0 will be returned. If the filter matches multiple documents, one will be selected from the matched set.

The opts parameter can be used to specify options for the operation (see the options.DeleteOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/delete/.

var coll *mongo.Collection

// Delete at most one document in which the "name" field is "Bob" or "bob".
// Specify the SetCollation option to provide a collation that will ignore
// case for string comparisons.
opts := options.Delete().SetCollation(&options.Collation{
    Locale:    "en_US",
    Strength:  1,
    CaseLevel: false,
})
res, err := coll.DeleteOne(context.TODO(), bson.D{{"name", "bob"}}, opts)
if err != nil {
    log.Fatal(err)
}
fmt.Printf("deleted %v documents\n", res.DeletedCount)

func (*Collection) Distinct ¶

func (coll *Collection) Distinct(ctx context.Context, fieldName string, filter interface{},
    opts ...*options.DistinctOptions) ([]interface{}, error)

Distinct executes a distinct command to find the unique values for a specified field in the collection.

The fieldName parameter specifies the field name for which distinct values should be returned.

The filter parameter must be a document containing query operators and can be used to select which documents are considered. It cannot be nil. An empty document (e.g. bson.D{}) should be used to select all documents.

The opts parameter can be used to specify options for the operation (see the options.DistinctOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/distinct/.

var coll *mongo.Collection

// Find all unique values for the "name" field for documents in which the
// "age" field is greater than 25.
// Specify the MaxTime option to limit the amount of time the operation can
// run on the server.
filter := bson.D{{"age", bson.D{{"$gt", 25}}}}
opts := options.Distinct().SetMaxTime(2 * time.Second)
values, err := coll.Distinct(context.TODO(), "name", filter, opts)
if err != nil {
    log.Fatal(err)
}

for _, value := range values {
    fmt.Println(value)
}

func (*Collection) Drop ¶

func (coll *Collection) Drop(ctx context.Context) error

Drop drops the collection on the server. This method ignores "namespace not found" errors so it is safe to drop a collection that does not exist on the server.

func (*Collection) EstimatedDocumentCount ¶

func (coll *Collection) EstimatedDocumentCount(ctx context.Context,
    opts ...*options.EstimatedDocumentCountOptions) (int64, error)

EstimatedDocumentCount executes a count command and returns an estimate of the number of documents in the collection using collection metadata.

The opts parameter can be used to specify options for the operation (see the options.EstimatedDocumentCountOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/count/.

var coll *mongo.Collection

// Get and print an estimated of the number of documents in the collection.
// Specify the MaxTime option to limit the amount of time the operation can
// run on the server.
opts := options.EstimatedDocumentCount().SetMaxTime(2 * time.Second)
count, err := coll.EstimatedDocumentCount(context.TODO(), opts)
if err != nil {
    log.Fatal(err)
}
fmt.Printf("estimated document count: %v", count)

func (*Collection) Find ¶

func (coll *Collection) Find(ctx context.Context, filter interface{},
    opts ...*options.FindOptions) (cur *Cursor, err error)

Find executes a find command and returns a Cursor over the matching documents in the collection.

The filter parameter must be a document containing query operators and can be used to select which documents are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include all documents.

The opts parameter can be used to specify options for the operation (see the options.FindOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/find/.

var coll *mongo.Collection

// Find all documents in which the "name" field is "Bob".
// Specify the Sort option to sort the returned documents by age in
// ascending order.
opts := options.Find().SetSort(bson.D{{"age", 1}})
cursor, err := coll.Find(context.TODO(), bson.D{{"name", "Bob"}}, opts)
if err != nil {
    log.Fatal(err)
}

// Get a list of all returned documents and print them out.
// See the mongo.Cursor documentation for more examples of using cursors.
var results []bson.M
if err = cursor.All(context.TODO(), &results); err != nil {
    log.Fatal(err)
}
for _, result := range results {
    fmt.Println(result)
}

ctx := context.TODO()
clientOptions := options.Client().ApplyURI("mongodb://localhost:27017")

// Connect to a mongodb server.
client, err := mongo.Connect(ctx, clientOptions)
if err != nil {
    panic(err)
}

defer func() { _ = client.Disconnect(ctx) }()

type Pet struct {
    Type string `bson:"type"`
    Name string `bson:"name"`
}

// Create a slice of documents to insert. We will lookup a subset of
// these documents using regex.
toInsert := []interface{}{
    Pet{Type: "cat", Name: "Mo"},
    Pet{Type: "dog", Name: "Loki"},
}

coll := client.Database("test").Collection("test")

if _, err := coll.InsertMany(ctx, toInsert); err != nil {
    panic(err)
}

// Create a filter to find a document with key "name" and any value that
// starts with letter "m". Use the "i" option to indicate
// case-insensitivity.
filter := bson.D{{"name", primitive.Regex{Pattern: "^m", Options: "i"}}}

_, err = coll.Find(ctx, filter)
if err != nil {
    panic(err)
}

ctx := context.TODO()
clientOptions := options.Client().ApplyURI("mongodb://localhost:27017")

// Connect to a mongodb server.
client, err := mongo.Connect(ctx, clientOptions)
if err != nil {
    panic(err)
}

defer func() { _ = client.Disconnect(ctx) }()

type Pet struct {
    Type string `bson:"type"`
    Name string `bson:"name"`
}

// Create a slice of documents to insert. We will lookup a subset of
// these documents using regex.
toInsert := []interface{}{
    Pet{Type: "cat", Name: "Mo"},
    Pet{Type: "dog", Name: "Loki"},
}

coll := client.Database("test").Collection("test")

if _, err := coll.InsertMany(ctx, toInsert); err != nil {
    panic(err)
}

// Create a filter to find a document with key "name" and any value that
// starts with letter "m". Use the "i" option to indicate
// case-insensitivity.
filter := bson.D{{"name", bson.D{{"$regex", "^m"}, {"$options", "i"}}}}

_, err = coll.Find(ctx, filter)
if err != nil {
    panic(err)
}

func (*Collection) FindOne ¶

func (coll *Collection) FindOne(ctx context.Context, filter interface{},
    opts ...*options.FindOneOptions) *SingleResult

FindOne executes a find command and returns a SingleResult for one document in the collection.

The filter parameter must be a document containing query operators and can be used to select the document to be returned. It cannot be nil. If the filter does not match any documents, a SingleResult with an error set to ErrNoDocuments will be returned. If the filter matches multiple documents, one will be selected from the matched set.

The opts parameter can be used to specify options for this operation (see the options.FindOneOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/find/.

var coll *mongo.Collection
var id primitive.ObjectID

// Find the document for which the _id field matches id.
// Specify the Sort option to sort the documents by age.
// The first document in the sorted order will be returned.
opts := options.FindOne().SetSort(bson.D{{"age", 1}})
var result bson.M
err := coll.FindOne(
    context.TODO(),
    bson.D{{"_id", id}},
    opts,
).Decode(&result)
if err != nil {
    // ErrNoDocuments means that the filter did not match any documents in
    // the collection.
    if errors.Is(err, mongo.ErrNoDocuments) {
        return
    }
    log.Fatal(err)
}
fmt.Printf("found document %v", result)

func (*Collection) FindOneAndDelete ¶

func (coll *Collection) FindOneAndDelete(ctx context.Context, filter interface{},
    opts ...*options.FindOneAndDeleteOptions) *SingleResult

FindOneAndDelete executes a findAndModify command to delete at most one document in the collection. and returns the document as it appeared before deletion.

The filter parameter must be a document containing query operators and can be used to select the document to be deleted. It cannot be nil. If the filter does not match any documents, a SingleResult with an error set to ErrNoDocuments wil be returned. If the filter matches multiple documents, one will be selected from the matched set.

The opts parameter can be used to specify options for the operation (see the options.FindOneAndDeleteOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/findAndModify/.

var coll *mongo.Collection
var id primitive.ObjectID

// Find and delete the document for which the _id field matches id.
// Specify the Projection option to only include the name and age fields in
// the returned document.
opts := options.FindOneAndDelete().
    SetProjection(bson.D{{"name", 1}, {"age", 1}})
var deletedDocument bson.M
err := coll.FindOneAndDelete(
    context.TODO(),
    bson.D{{"_id", id}},
    opts,
).Decode(&deletedDocument)
if err != nil {
    // ErrNoDocuments means that the filter did not match any documents in
    // the collection.
    if errors.Is(err, mongo.ErrNoDocuments) {
        return
    }
    log.Fatal(err)
}
fmt.Printf("deleted document %v", deletedDocument)

func (*Collection) FindOneAndReplace ¶

func (coll *Collection) FindOneAndReplace(ctx context.Context, filter interface{},
    replacement interface{}, opts ...*options.FindOneAndReplaceOptions) *SingleResult

FindOneAndReplace executes a findAndModify command to replace at most one document in the collection and returns the document as it appeared before replacement.

The filter parameter must be a document containing query operators and can be used to select the document to be replaced. It cannot be nil. If the filter does not match any documents, a SingleResult with an error set to ErrNoDocuments wil be returned. If the filter matches multiple documents, one will be selected from the matched set.

The replacement parameter must be a document that will be used to replace the selected document. It cannot be nil and cannot contain any update operators (https://www.mongodb.com/docs/manual/reference/operator/update/).

The opts parameter can be used to specify options for the operation (see the options.FindOneAndReplaceOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/findAndModify/.

var coll *mongo.Collection
var id primitive.ObjectID

// Find the document for which the _id field matches id and add a field
// called "location".
// Specify the Upsert option to insert a new document if a document matching
// the filter isn't found.
opts := options.FindOneAndReplace().SetUpsert(true)
filter := bson.D{{"_id", id}}
replacement := bson.D{{"location", "NYC"}}
var replacedDocument bson.M
err := coll.FindOneAndReplace(
    context.TODO(),
    filter,
    replacement,
    opts,
).Decode(&replacedDocument)
if err != nil {
    // ErrNoDocuments means that the filter did not match any documents in
    // the collection.
    if errors.Is(err, mongo.ErrNoDocuments) {
        return
    }
    log.Fatal(err)
}
fmt.Printf("replaced document %v", replacedDocument)

func (*Collection) FindOneAndUpdate ¶

func (coll *Collection) FindOneAndUpdate(ctx context.Context, filter interface{},
    update interface{}, opts ...*options.FindOneAndUpdateOptions) *SingleResult

FindOneAndUpdate executes a findAndModify command to update at most one document in the collection and returns the document as it appeared before updating.

The filter parameter must be a document containing query operators and can be used to select the document to be updated. It cannot be nil. If the filter does not match any documents, a SingleResult with an error set to ErrNoDocuments wil be returned. If the filter matches multiple documents, one will be selected from the matched set.

The update parameter must be a document containing update operators (https://www.mongodb.com/docs/manual/reference/operator/update/) and can be used to specify the modifications to be made to the selected document. It cannot be nil or empty.

The opts parameter can be used to specify options for the operation (see the options.FindOneAndUpdateOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/findAndModify/.

var coll *mongo.Collection
var id primitive.ObjectID

// Find the document for which the _id field matches id and set the email to
// "newemail@example.com".
// Specify the Upsert option to insert a new document if a document matching
// the filter isn't found.
opts := options.FindOneAndUpdate().SetUpsert(true)
filter := bson.D{{"_id", id}}
update := bson.D{{"$set", bson.D{{"email", "newemail@example.com"}}}}
var updatedDocument bson.M
err := coll.FindOneAndUpdate(
    context.TODO(),
    filter,
    update,
    opts,
).Decode(&updatedDocument)
if err != nil {
    // ErrNoDocuments means that the filter did not match any documents in
    // the collection.
    if errors.Is(err, mongo.ErrNoDocuments) {
        return
    }
    log.Fatal(err)
}
fmt.Printf("updated document %v", updatedDocument)

func (*Collection) Indexes ¶

func (coll *Collection) Indexes() IndexView

Indexes returns an IndexView instance that can be used to perform operations on the indexes for the collection.

func (*Collection) InsertMany ¶

func (coll *Collection) InsertMany(ctx context.Context, documents []interface{},
    opts ...*options.InsertManyOptions) (*InsertManyResult, error)

InsertMany executes an insert command to insert multiple documents into the collection. If write errors occur during the operation (e.g. duplicate key error), this method returns a BulkWriteException error.

The documents parameter must be a slice of documents to insert. The slice cannot be nil or empty. The elements must all be non-nil. For any document that does not have an _id field when transformed into BSON, one will be added automatically to the marshalled document. The original document will not be modified. The _id values for the inserted documents can be retrieved from the InsertedIDs field of the returned InsertManyResult.

The opts parameter can be used to specify options for the operation (see the options.InsertManyOptions documentation.)

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/insert/.

var coll *mongo.Collection

// Insert documents {name: "Alice"} and {name: "Bob"}.
// Set the Ordered option to false to allow both operations to happen even
// if one of them errors.
docs := []interface{}{
    bson.D{{"name", "Alice"}},
    bson.D{{"name", "Bob"}},
}
opts := options.InsertMany().SetOrdered(false)
res, err := coll.InsertMany(context.TODO(), docs, opts)
if err != nil {
    log.Fatal(err)
}
fmt.Printf("inserted documents with IDs %v\n", res.InsertedIDs)

func (*Collection) InsertOne ¶

func (coll *Collection) InsertOne(ctx context.Context, document interface{},
    opts ...*options.InsertOneOptions) (*InsertOneResult, error)

InsertOne executes an insert command to insert a single document into the collection.

The document parameter must be the document to be inserted. It cannot be nil. If the document does not have an _id field when transformed into BSON, one will be added automatically to the marshalled document. The original document will not be modified. The _id can be retrieved from the InsertedID field of the returned InsertOneResult.

The opts parameter can be used to specify options for the operation (see the options.InsertOneOptions documentation.)

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/insert/.

var coll *mongo.Collection

// Insert the document {name: "Alice"}.
res, err := coll.InsertOne(context.TODO(), bson.D{{"name", "Alice"}})
if err != nil {
    log.Fatal(err)
}
fmt.Printf("inserted document with ID %v\n", res.InsertedID)

func (*Collection) Name ¶

func (coll *Collection) Name() string

Name returns the name of the collection.

func (*Collection) ReplaceOne ¶

func (coll *Collection) ReplaceOne(ctx context.Context, filter interface{},
    replacement interface{}, opts ...*options.ReplaceOptions) (*UpdateResult, error)

ReplaceOne executes an update command to replace at most one document in the collection.

The filter parameter must be a document containing query operators and can be used to select the document to be replaced. It cannot be nil. If the filter does not match any documents, the operation will succeed and an UpdateResult with a MatchedCount of 0 will be returned. If the filter matches multiple documents, one will be selected from the matched set and MatchedCount will equal 1.

The replacement parameter must be a document that will be used to replace the selected document. It cannot be nil and cannot contain any update operators (https://www.mongodb.com/docs/manual/reference/operator/update/).

The opts parameter can be used to specify options for the operation (see the options.ReplaceOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/update/.

var coll *mongo.Collection
var id primitive.ObjectID

// Find the document for which the _id field matches id and add a field
// called "location".
// Specify the Upsert option to insert a new document if a document matching
// the filter isn't found.
opts := options.Replace().SetUpsert(true)
filter := bson.D{{"_id", id}}
replacement := bson.D{{"location", "NYC"}}
result, err := coll.ReplaceOne(context.TODO(), filter, replacement, opts)
if err != nil {
    log.Fatal(err)
}

if result.MatchedCount != 0 {
    fmt.Println("matched and replaced an existing document")
    return
}
if result.UpsertedCount != 0 {
    fmt.Printf("inserted a new document with ID %v\n", result.UpsertedID)
}

func (*Collection) SearchIndexes ¶

func (coll *Collection) SearchIndexes() SearchIndexView

SearchIndexes returns a SearchIndexView instance that can be used to perform operations on the search indexes for the collection.

func (*Collection) UpdateByID ¶

func (coll *Collection) UpdateByID(ctx context.Context, id interface{}, update interface{},
    opts ...*options.UpdateOptions) (*UpdateResult, error)

UpdateByID executes an update command to update the document whose _id value matches the provided ID in the collection. This is equivalent to running UpdateOne(ctx, bson.D{{"_id", id}}, update, opts...).

The id parameter is the _id of the document to be updated. It cannot be nil. If the ID does not match any documents, the operation will succeed and an UpdateResult with a MatchedCount of 0 will be returned.

The update parameter must be a document containing update operators (https://www.mongodb.com/docs/manual/reference/operator/update/) and can be used to specify the modifications to be made to the selected document. It cannot be nil or empty.

The opts parameter can be used to specify options for the operation (see the options.UpdateOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/update/.

func (*Collection) UpdateMany ¶

func (coll *Collection) UpdateMany(ctx context.Context, filter interface{}, update interface{},
    opts ...*options.UpdateOptions) (*UpdateResult, error)

UpdateMany executes an update command to update documents in the collection.

The filter parameter must be a document containing query operators and can be used to select the documents to be updated. It cannot be nil. If the filter does not match any documents, the operation will succeed and an UpdateResult with a MatchedCount of 0 will be returned.

The update parameter must be a document containing update operators (https://www.mongodb.com/docs/manual/reference/operator/update/) and can be used to specify the modifications to be made to the selected documents. It cannot be nil or empty.

The opts parameter can be used to specify options for the operation (see the options.UpdateOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/update/.

var coll *mongo.Collection

// Increment the age for all users whose birthday is today.
today := time.Now().Format("01-01-1970")
filter := bson.D{{"birthday", today}}
update := bson.D{{"$inc", bson.D{{"age", 1}}}}

result, err := coll.UpdateMany(context.TODO(), filter, update)
if err != nil {
    log.Fatal(err)
}

if result.MatchedCount != 0 {
    fmt.Println("matched and replaced an existing document")
    return
}

func (*Collection) UpdateOne ¶

func (coll *Collection) UpdateOne(ctx context.Context, filter interface{}, update interface{},
    opts ...*options.UpdateOptions) (*UpdateResult, error)

UpdateOne executes an update command to update at most one document in the collection.

The filter parameter must be a document containing query operators and can be used to select the document to be updated. It cannot be nil. If the filter does not match any documents, the operation will succeed and an UpdateResult with a MatchedCount of 0 will be returned. If the filter matches multiple documents, one will be selected from the matched set and MatchedCount will equal 1.

The update parameter must be a document containing update operators (https://www.mongodb.com/docs/manual/reference/operator/update/) and can be used to specify the modifications to be made to the selected document. It cannot be nil or empty.

The opts parameter can be used to specify options for the operation (see the options.UpdateOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/update/.

var coll *mongo.Collection
var id primitive.ObjectID

// Find the document for which the _id field matches id and set the email to
// "newemail@example.com".
// Specify the Upsert option to insert a new document if a document matching
// the filter isn't found.
opts := options.Update().SetUpsert(true)
filter := bson.D{{"_id", id}}
update := bson.D{{"$set", bson.D{{"email", "newemail@example.com"}}}}

result, err := coll.UpdateOne(context.TODO(), filter, update, opts)
if err != nil {
    log.Fatal(err)
}

if result.MatchedCount != 0 {
    fmt.Println("matched and replaced an existing document")
    return
}
if result.UpsertedCount != 0 {
    fmt.Printf("inserted a new document with ID %v\n", result.UpsertedID)
}

func (*Collection) Watch ¶

func (coll *Collection) Watch(ctx context.Context, pipeline interface{},
    opts ...*options.ChangeStreamOptions) (*ChangeStream, error)

Watch returns a change stream for all changes on the corresponding collection. See https://www.mongodb.com/docs/manual/changeStreams/ for more information about change streams.

The Collection must be configured with read concern majority or no read concern for a change stream to be created successfully.

The pipeline parameter must be an array of documents, each representing a pipeline stage. The pipeline cannot be nil but can be empty. The stage documents must all be non-nil. See https://www.mongodb.com/docs/manual/changeStreams/ for a list of pipeline stages that can be used with change streams. For a pipeline of bson.D documents, the mongo.Pipeline{} type can be used.

The opts parameter can be used to specify options for change stream creation (see the options.ChangeStreamOptions documentation).

var collection *mongo.Collection

// Specify a pipeline that will only match "insert" events.
// Specify the MaxAwaitTimeOption to have each attempt wait two seconds for
// new documents.
matchStage := bson.D{{"$match", bson.D{{"operationType", "insert"}}}}
opts := options.ChangeStream().SetMaxAwaitTime(2 * time.Second)
changeStream, err := collection.Watch(
    context.TODO(),
    mongo.Pipeline{matchStage},
    opts)
if err != nil {
    log.Fatal(err)
}

// Print out all change stream events in the order they're received.
// See the mongo.ChangeStream documentation for more examples of using
// change streams.
for changeStream.Next(context.TODO()) {
    fmt.Println(changeStream.Current)
}

type CollectionSpecification ¶

CollectionSpecification represents a collection in a database. This type is returned by the Database.ListCollectionSpecifications function.

type CollectionSpecification struct {
    // The collection name.
    Name string

    // The type of the collection. This will either be "collection" or "view".
    Type string

    // Whether or not the collection is readOnly. This will be false for MongoDB versions < 3.4.
    ReadOnly bool

    // The collection UUID. This field will be nil for MongoDB versions < 3.6. For versions 3.6 and higher, this will
    // be a primitive.Binary with Subtype 4.
    UUID *primitive.Binary

    // A document containing the options used to construct the collection.
    Options bson.Raw

    // An IndexSpecification instance with details about the collection's _id index. This will be nil if the NameOnly
    // option is used and for MongoDB versions < 3.4.
    IDIndex *IndexSpecification
}

func (*CollectionSpecification) UnmarshalBSON ¶

func (cs *CollectionSpecification) UnmarshalBSON(data []byte) error

UnmarshalBSON implements the bson.Unmarshaler interface.

Deprecated: Unmarshaling a CollectionSpecification from BSON will not be supported in Go Driver 2.0.

type CommandError ¶

CommandError represents a server error during execution of a command. This can be returned by any operation.

type CommandError struct {
    Code    int32
    Message string
    Labels  []string // Categories to which the error belongs
    Name    string   // A human-readable name corresponding to the error code
    Wrapped error    // The underlying error, if one exists.
    Raw     bson.Raw // The original server response containing the error.
}

func (CommandError) Error ¶

func (e CommandError) Error() string

Error implements the error interface.

func (CommandError) HasErrorCode ¶

func (e CommandError) HasErrorCode(code int) bool

HasErrorCode returns true if the error has the specified code.

func (CommandError) HasErrorCodeWithMessage ¶

func (e CommandError) HasErrorCodeWithMessage(code int, message string) bool

HasErrorCodeWithMessage returns true if the error has the specified code and Message contains the specified message.

func (CommandError) HasErrorLabel ¶

func (e CommandError) HasErrorLabel(label string) bool

HasErrorLabel returns true if the error contains the specified label.

func (CommandError) HasErrorMessage ¶

func (e CommandError) HasErrorMessage(message string) bool

HasErrorMessage returns true if the error contains the specified message.

func (CommandError) IsMaxTimeMSExpiredError ¶

func (e CommandError) IsMaxTimeMSExpiredError() bool

IsMaxTimeMSExpiredError returns true if the error is a MaxTimeMSExpired error.

func (CommandError) Unwrap ¶

func (e CommandError) Unwrap() error

Unwrap returns the underlying error.

type Cursor ¶

Cursor is used to iterate over a stream of documents. Each document can be decoded into a Go type via the Decode method or accessed as raw BSON via the Current field. This type is not goroutine safe and must not be used concurrently by multiple goroutines.

type Cursor struct {
    // Current contains the BSON bytes of the current change document. This property is only valid until the next call
    // to Next or TryNext. If continued access is required, a copy must be made.
    Current bson.Raw
    // contains filtered or unexported fields
}

func NewCursorFromDocuments ¶

func NewCursorFromDocuments(documents []interface{}, err error, registry *bsoncodec.Registry) (*Cursor, error)

NewCursorFromDocuments creates a new Cursor pre-loaded with the provided documents, error and registry. If no registry is provided, bson.DefaultRegistry will be used.

The documents parameter must be a slice of documents. The slice may be nil or empty, but all elements must be non-nil.

func (*Cursor) All ¶

func (c *Cursor) All(ctx context.Context, results interface{}) error

All iterates the cursor and decodes each document into results. The results parameter must be a pointer to a slice. The slice pointed to by results will be completely overwritten. This method will close the cursor after retrieving all documents. If the cursor has been iterated, any previously iterated documents will not be included in results.

This method requires driver version >= 1.1.0.

var cursor *mongo.Cursor

var results []bson.M
if err := cursor.All(context.TODO(), &results); err != nil {
    log.Fatal(err)
}
fmt.Println(results)

func (*Cursor) Close ¶

func (c *Cursor) Close(ctx context.Context) error

Close closes this cursor. Next and TryNext must not be called after Close has been called. Close is idempotent. After the first call, any subsequent calls will not change the state.

func (*Cursor) Decode ¶

func (c *Cursor) Decode(val interface{}) error

Decode will unmarshal the current document into val and return any errors from the unmarshalling process without any modification. If val is nil or is a typed nil, an error will be returned.

func (*Cursor) Err ¶

func (c *Cursor) Err() error

Err returns the last error seen by the Cursor, or nil if no error has occurred.

func (*Cursor) ID ¶

func (c *Cursor) ID() int64

ID returns the ID of this cursor, or 0 if the cursor has been closed or exhausted.

func (*Cursor) Next ¶

func (c *Cursor) Next(ctx context.Context) bool

Next gets the next document for this cursor. It returns true if there were no errors and the cursor has not been exhausted.

Next blocks until a document is available or an error occurs. If the context expires, the cursor's error will be set to ctx.Err(). In case of an error, Next will return false.

If Next returns false, subsequent calls will also return false.

var cursor *mongo.Cursor
defer cursor.Close(context.TODO())

// Iterate the cursor and print out each document until the cursor is
// exhausted or there is an error getting the next document.
for cursor.Next(context.TODO()) {
    // A new result variable should be declared for each document.
    var result bson.M
    if err := cursor.Decode(&result); err != nil {
        log.Fatal(err)
    }
    fmt.Println(result)
}
if err := cursor.Err(); err != nil {
    log.Fatal(err)
}

func (*Cursor) RemainingBatchLength ¶

func (c *Cursor) RemainingBatchLength() int

RemainingBatchLength returns the number of documents left in the current batch. If this returns zero, the subsequent call to Next or TryNext will do a network request to fetch the next batch.

// Because we're using a tailable cursor, this must be a handle to a capped
// collection.
var coll *mongo.Collection

// Create a tailable await cursor. Specify the MaxAwaitTime option so
// requests to get more data will return if there are no documents available
// after two seconds.
findOpts := options.Find().
    SetCursorType(options.TailableAwait).
    SetMaxAwaitTime(2 * time.Second)
cursor, err := coll.Find(context.TODO(), bson.D{}, findOpts)
if err != nil {
    panic(err)
}

for {
    // Iterate the cursor using TryNext.
    if cursor.TryNext(context.TODO()) {
        fmt.Println(cursor.Current)
    }

    // Handle cursor errors or the cursor being closed by the server.
    if err = cursor.Err(); err != nil {
        panic(err)
    }
    if cursor.ID() == 0 {
        panic("cursor was unexpectedly closed by the server")
    }

    // Use the RemainingBatchLength function to rate-limit the number of
    // network requests the driver does. If the current batch is empty,
    // sleep for a short amount of time to let documents build up on the
    // server before the next TryNext call, which will do a network request.
    if cursor.RemainingBatchLength() == 0 {
        time.Sleep(100 * time.Millisecond)
    }
}

func (*Cursor) SetBatchSize ¶

func (c *Cursor) SetBatchSize(batchSize int32)

SetBatchSize sets the number of documents to fetch from the database with each iteration of the cursor's "Next" method. Note that some operations set an initial cursor batch size, so this setting only affects subsequent document batches fetched from the database.

func (*Cursor) SetComment ¶

func (c *Cursor) SetComment(comment interface{})

SetComment will set a user-configurable comment that can be used to identify the operation in server logs.

func (*Cursor) SetMaxTime ¶

func (c *Cursor) SetMaxTime(dur time.Duration)

SetMaxTime will set the maximum amount of time the server will allow the operations to execute. The server will error if this field is set but the cursor is not configured with awaitData=true.

The time.Duration value passed by this setter will be converted and rounded down to the nearest millisecond.

func (*Cursor) TryNext ¶

func (c *Cursor) TryNext(ctx context.Context) bool

TryNext attempts to get the next document for this cursor. It returns true if there were no errors and the next document is available. This is only recommended for use with tailable cursors as a non-blocking alternative to Next. See https://www.mongodb.com/docs/manual/core/tailable-cursors/ for more information about tailable cursors.

TryNext returns false if the cursor is exhausted, an error occurs when getting results from the server, the next document is not yet available, or ctx expires. If the context expires, the cursor's error will be set to ctx.Err().

If TryNext returns false and an error occurred or the cursor has been exhausted (i.e. c.Err() != nil || c.ID() == 0), subsequent attempts will also return false. Otherwise, it is safe to call TryNext again until a document is available.

This method requires driver version >= 1.2.0.

var cursor *mongo.Cursor
defer cursor.Close(context.TODO())

// Iterate the cursor and print out each document until the cursor is
// exhausted or there is an error getting the next document.
for {
    if cursor.TryNext(context.TODO()) {
        // A new result variable should be declared for each document.
        var result bson.M
        if err := cursor.Decode(&result); err != nil {
            log.Fatal(err)
        }
        fmt.Println(result)
        continue
    }

    // If TryNext returns false, the next document is not yet available, the
    // cursor was exhausted and was closed, or an error occurred. TryNext
    // should only be called again for the empty batch case.
    if err := cursor.Err(); err != nil {
        log.Fatal(err)
    }
    if cursor.ID() == 0 {
        break
    }
}

type Database ¶

Database is a handle to a MongoDB database. It is safe for concurrent use by multiple goroutines.

type Database struct {
    // contains filtered or unexported fields
}

func (*Database) Aggregate ¶

func (db *Database) Aggregate(ctx context.Context, pipeline interface{},
    opts ...*options.AggregateOptions) (*Cursor, error)

Aggregate executes an aggregate command the database. This requires MongoDB version >= 3.6 and driver version >= 1.1.0.

The pipeline parameter must be a slice of documents, each representing an aggregation stage. The pipeline cannot be nil but can be empty. The stage documents must all be non-nil. For a pipeline of bson.D documents, the mongo.Pipeline type can be used. See https://www.mongodb.com/docs/manual/reference/operator/aggregation-pipeline/#db-aggregate-stages for a list of valid stages in database-level aggregations.

The opts parameter can be used to specify options for this operation (see the options.AggregateOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/aggregate/.

func (*Database) Client ¶

func (db *Database) Client() *Client

Client returns the Client the Database was created from.

func (*Database) Collection ¶

func (db *Database) Collection(name string, opts ...*options.CollectionOptions) *Collection

Collection gets a handle for a collection with the given name configured with the given CollectionOptions.

func (*Database) CreateCollection ¶

func (db *Database) CreateCollection(ctx context.Context, name string, opts ...*options.CreateCollectionOptions) error

CreateCollection executes a create command to explicitly create a new collection with the specified name on the server. If the collection being created already exists, this method will return a mongo.CommandError. This method requires driver version 1.4.0 or higher.

The opts parameter can be used to specify options for the operation (see the options.CreateCollectionOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/create/.

var db *mongo.Database

// Create a "users" collection with a JSON schema validator. The validator
// will ensure that each document in the collection has "name" and "age"
// fields.
jsonSchema := bson.M{
    "bsonType": "object",
    "required": []string{"name", "age"},
    "properties": bson.M{
        "name": bson.M{
            "bsonType": "string",
            "description": "the name of the user, which is required and " +
                "must be a string",
        },
        "age": bson.M{
            "bsonType": "int",
            "minimum":  18,
            "description": "the age of the user, which is required and " +
                "must be an integer >= 18",
        },
    },
}
validator := bson.M{
    "$jsonSchema": jsonSchema,
}
opts := options.CreateCollection().SetValidator(validator)

err := db.CreateCollection(context.TODO(), "users", opts)
if err != nil {
    log.Fatal(err)
}

func (*Database) CreateView ¶

func (db *Database) CreateView(ctx context.Context, viewName, viewOn string, pipeline interface{},
    opts ...*options.CreateViewOptions) error

CreateView executes a create command to explicitly create a view on the server. See https://www.mongodb.com/docs/manual/core/views/ for more information about views. This method requires driver version >= 1.4.0 and MongoDB version >= 3.4.

The viewName parameter specifies the name of the view to create.

The viewOn parameter specifies the name of the collection or view on which this view will be created

The pipeline parameter specifies an aggregation pipeline that will be exececuted against the source collection or view to create this view.

The opts parameter can be used to specify options for the operation (see the options.CreateViewOptions documentation).

var db *mongo.Database

// Create a view on the "users" collection called "usernames". Specify a
// pipeline that concatenates the "firstName" and "lastName" fields from
// each document in "users" and projects the result into the "fullName"
// field in the view.
projectStage := bson.D{
    {"$project", bson.D{
        {"_id", 0},
        {"fullName", bson.D{
            {"$concat", []string{"$firstName", " ", "$lastName"}},
        }},
    }},
}
pipeline := mongo.Pipeline{projectStage}

// Specify the Collation option to set a default collation for the view.
opts := options.CreateView().SetCollation(&options.Collation{
    Locale: "en_US",
})

err := db.CreateView(context.TODO(), "usernames", "users", pipeline, opts)
if err != nil {
    log.Fatal(err)
}

func (*Database) Drop ¶

func (db *Database) Drop(ctx context.Context) error

Drop drops the database on the server. This method ignores "namespace not found" errors so it is safe to drop a database that does not exist on the server.

func (*Database) ListCollectionNames ¶

func (db *Database) ListCollectionNames(ctx context.Context, filter interface{}, opts ...*options.ListCollectionsOptions) ([]string, error)

ListCollectionNames executes a listCollections command and returns a slice containing the names of the collections in the database. This method requires driver version >= 1.1.0.

The filter parameter must be a document containing query operators and can be used to select which collections are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include all collections.

The opts parameter can be used to specify options for the operation (see the options.ListCollectionsOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listCollections/.

BUG(benjirewis): ListCollectionNames prevents listing more than 100 collections per database when running against MongoDB version 2.6.

var db *mongo.Database

// Use a filter to only select capped collections.
result, err := db.ListCollectionNames(
    context.TODO(),
    bson.D{{"options.capped", true}})
if err != nil {
    log.Fatal(err)
}

for _, coll := range result {
    fmt.Println(coll)
}

func (*Database) ListCollectionSpecifications ¶

func (db *Database) ListCollectionSpecifications(ctx context.Context, filter interface{},
    opts ...*options.ListCollectionsOptions) ([]*CollectionSpecification, error)

ListCollectionSpecifications executes a listCollections command and returns a slice of CollectionSpecification instances representing the collections in the database.

The filter parameter must be a document containing query operators and can be used to select which collections are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include all collections.

The opts parameter can be used to specify options for the operation (see the options.ListCollectionsOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listCollections/.

BUG(benjirewis): ListCollectionSpecifications prevents listing more than 100 collections per database when running against MongoDB version 2.6.

func (*Database) ListCollections ¶

func (db *Database) ListCollections(ctx context.Context, filter interface{}, opts ...*options.ListCollectionsOptions) (*Cursor, error)

ListCollections executes a listCollections command and returns a cursor over the collections in the database.

The filter parameter must be a document containing query operators and can be used to select which collections are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include all collections.

The opts parameter can be used to specify options for the operation (see the options.ListCollectionsOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listCollections/.

BUG(benjirewis): ListCollections prevents listing more than 100 collections per database when running against MongoDB version 2.6.

func (*Database) Name ¶

func (db *Database) Name() string

Name returns the name of the database.

func (*Database) ReadConcern ¶

func (db *Database) ReadConcern() *readconcern.ReadConcern

ReadConcern returns the read concern used to configure the Database object.

func (*Database) ReadPreference ¶

func (db *Database) ReadPreference() *readpref.ReadPref

ReadPreference returns the read preference used to configure the Database object.

func (*Database) RunCommand ¶

func (db *Database) RunCommand(ctx context.Context, runCommand interface{}, opts ...*options.RunCmdOptions) *SingleResult

RunCommand executes the given command against the database.

This function does not obey the Database's readPreference. To specify a read preference, the RunCmdOptions.ReadPreference option must be used.

This function does not obey the Database's readConcern or writeConcern. A user must supply these values manually in the user-provided runCommand parameter.

The runCommand parameter must be a document for the command to be executed. It cannot be nil. This must be an order-preserving type such as bson.D. Map types such as bson.M are not valid.

The opts parameter can be used to specify options for this operation (see the options.RunCmdOptions documentation).

The behavior of RunCommand is undefined if the command document contains any of the following: - A session ID or any transaction-specific fields - API versioning options when an API version is already declared on the Client - maxTimeMS when Timeout is set on the Client

var db *mongo.Database

// Run an explain command to see the query plan for when a "find" is
// executed on collection "bar" specify the ReadPreference option to
// explicitly set the read preference to primary.
findCmd := bson.D{{"find", "bar"}}
command := bson.D{{"explain", findCmd}}
opts := options.RunCmd().SetReadPreference(readpref.Primary())
var result bson.M
err := db.RunCommand(context.TODO(), command, opts).Decode(&result)
if err != nil {
    log.Fatal(err)
}
fmt.Println(result)

func (*Database) RunCommandCursor ¶

func (db *Database) RunCommandCursor(ctx context.Context, runCommand interface{}, opts ...*options.RunCmdOptions) (*Cursor, error)

RunCommandCursor executes the given command against the database and parses the response as a cursor. If the command being executed does not return a cursor (e.g. insert), the command will be executed on the server and an error will be returned because the server response cannot be parsed as a cursor. This function does not obey the Database's read preference. To specify a read preference, the RunCmdOptions.ReadPreference option must be used.

The runCommand parameter must be a document for the command to be executed. It cannot be nil. This must be an order-preserving type such as bson.D. Map types such as bson.M are not valid.

The opts parameter can be used to specify options for this operation (see the options.RunCmdOptions documentation).

The behavior of RunCommandCursor is undefined if the command document contains any of the following: - A session ID or any transaction-specific fields - API versioning options when an API version is already declared on the Client - maxTimeMS when Timeout is set on the Client

func (*Database) Watch ¶

func (db *Database) Watch(ctx context.Context, pipeline interface{},
    opts ...*options.ChangeStreamOptions) (*ChangeStream, error)

Watch returns a change stream for all changes to the corresponding database. See https://www.mongodb.com/docs/manual/changeStreams/ for more information about change streams.

The Database must be configured with read concern majority or no read concern for a change stream to be created successfully.

The pipeline parameter must be a slice of documents, each representing a pipeline stage. The pipeline cannot be nil but can be empty. The stage documents must all be non-nil. See https://www.mongodb.com/docs/manual/changeStreams/ for a list of pipeline stages that can be used with change streams. For a pipeline of bson.D documents, the mongo.Pipeline{} type can be used.

The opts parameter can be used to specify options for change stream creation (see the options.ChangeStreamOptions documentation).

var db *mongo.Database

// Specify a pipeline that will only match "insert" events.
// Specify the MaxAwaitTimeOption to have each attempt wait two seconds for
// new documents.
matchStage := bson.D{{"$match", bson.D{{"operationType", "insert"}}}}
opts := options.ChangeStream().SetMaxAwaitTime(2 * time.Second)
changeStream, err := db.Watch(
    context.TODO(),
    mongo.Pipeline{matchStage},
    opts)
if err != nil {
    log.Fatal(err)
}

// Print out all change stream events in the order they're received.
// See the mongo.ChangeStream documentation for more examples of using
// change streams
for changeStream.Next(context.TODO()) {
    fmt.Println(changeStream.Current)
}

func (*Database) WriteConcern ¶

func (db *Database) WriteConcern() *writeconcern.WriteConcern

WriteConcern returns the write concern used to configure the Database object.

type DatabaseSpecification ¶

DatabaseSpecification contains information for a database. This type is returned as part of ListDatabasesResult.

type DatabaseSpecification struct {
    Name       string // The name of the database.
    SizeOnDisk int64  // The total size of the database files on disk in bytes.
    Empty      bool   // Specifies whether or not the database is empty.
}

type DeleteManyModel ¶

DeleteManyModel is used to delete multiple documents in a BulkWrite operation.

type DeleteManyModel struct {
    Filter    interface{}
    Collation *options.Collation
    Hint      interface{}
}

func NewDeleteManyModel ¶

func NewDeleteManyModel() *DeleteManyModel

NewDeleteManyModel creates a new DeleteManyModel.

func (*DeleteManyModel) SetCollation ¶

func (dmm *DeleteManyModel) SetCollation(collation *options.Collation) *DeleteManyModel

SetCollation specifies a collation to use for string comparisons. The default is nil, meaning no collation will be used.

func (*DeleteManyModel) SetFilter ¶

func (dmm *DeleteManyModel) SetFilter(filter interface{}) *DeleteManyModel

SetFilter specifies a filter to use to select documents to delete. The filter must be a document containing query operators. It cannot be nil.

func (*DeleteManyModel) SetHint ¶

func (dmm *DeleteManyModel) SetHint(hint interface{}) *DeleteManyModel

SetHint specifies the index to use for the operation. This should either be the index name as a string or the index specification as a document. This option is only valid for MongoDB versions >= 4.4. Server versions >= 3.4 will return an error if this option is specified. For server versions < 3.4, the driver will return a client-side error if this option is specified. The driver will return an error if this option is specified during an unacknowledged write operation. The driver will return an error if the hint parameter is a multi-key map. The default value is nil, which means that no hint will be sent.

type DeleteOneModel ¶

DeleteOneModel is used to delete at most one document in a BulkWriteOperation.

type DeleteOneModel struct {
    Filter    interface{}
    Collation *options.Collation
    Hint      interface{}
}

func NewDeleteOneModel ¶

func NewDeleteOneModel() *DeleteOneModel

NewDeleteOneModel creates a new DeleteOneModel.

func (*DeleteOneModel) SetCollation ¶

func (dom *DeleteOneModel) SetCollation(collation *options.Collation) *DeleteOneModel

SetCollation specifies a collation to use for string comparisons. The default is nil, meaning no collation will be used.

func (*DeleteOneModel) SetFilter ¶

func (dom *DeleteOneModel) SetFilter(filter interface{}) *DeleteOneModel

SetFilter specifies a filter to use to select the document to delete. The filter must be a document containing query operators. It cannot be nil. If the filter matches multiple documents, one will be selected from the matching documents.

func (*DeleteOneModel) SetHint ¶

func (dom *DeleteOneModel) SetHint(hint interface{}) *DeleteOneModel

SetHint specifies the index to use for the operation. This should either be the index name as a string or the index specification as a document. This option is only valid for MongoDB versions >= 4.4. Server versions >= 3.4 will return an error if this option is specified. For server versions < 3.4, the driver will return a client-side error if this option is specified. The driver will return an error if this option is specified during an unacknowledged write operation. The driver will return an error if the hint parameter is a multi-key map. The default value is nil, which means that no hint will be sent.

type DeleteResult ¶

DeleteResult is the result type returned by DeleteOne and DeleteMany operations.

type DeleteResult struct {
    DeletedCount int64 `bson:"n"` // The number of documents deleted.
}

type Dialer ¶

Dialer is used to make network connections.

type Dialer interface {
    DialContext(ctx context.Context, network, address string) (net.Conn, error)
}

type EncryptionKeyVaultError ¶

EncryptionKeyVaultError represents an error while communicating with the key vault collection during client-side encryption.

type EncryptionKeyVaultError struct {
    Wrapped error
}

func (EncryptionKeyVaultError) Error ¶

func (ekve EncryptionKeyVaultError) Error() string

Error implements the error interface.

func (EncryptionKeyVaultError) Unwrap ¶

func (ekve EncryptionKeyVaultError) Unwrap() error

Unwrap returns the underlying error.

type ErrMapForOrderedArgument ¶

ErrMapForOrderedArgument is returned when a map with multiple keys is passed to a CRUD method for an ordered parameter

type ErrMapForOrderedArgument struct {
    ParamName string
}

func (ErrMapForOrderedArgument) Error ¶

func (e ErrMapForOrderedArgument) Error() string

Error implements the error interface.

type IndexModel ¶

IndexModel represents a new index to be created.

type IndexModel struct {
    // A document describing which keys should be used for the index. It cannot be nil. This must be an order-preserving
    // type such as bson.D. Map types such as bson.M are not valid. See https://www.mongodb.com/docs/manual/indexes/#indexes
    // for examples of valid documents.
    Keys interface{}

    // The options to use to create the index.
    Options *options.IndexOptions
}

type IndexOptionsBuilder ¶

IndexOptionsBuilder specifies options for a new index.

Deprecated: Use the IndexOptions type in the mongo/options package instead.

type IndexOptionsBuilder struct {
    // contains filtered or unexported fields
}

func NewIndexOptionsBuilder ¶

func NewIndexOptionsBuilder() *IndexOptionsBuilder

NewIndexOptionsBuilder creates a new IndexOptionsBuilder.

Deprecated: Use the Index function in mongo/options instead.

func (*IndexOptionsBuilder) Background ¶

func (iob *IndexOptionsBuilder) Background(background bool) *IndexOptionsBuilder

Background specifies a value for the background option.

Deprecated: Use the IndexOptions.SetBackground function in mongo/options instead.

func (*IndexOptionsBuilder) Bits ¶

func (iob *IndexOptionsBuilder) Bits(bits int32) *IndexOptionsBuilder

Bits specifies a value for the bits option.

Deprecated: Use the IndexOptions.SetBits function in mongo/options instead.

func (*IndexOptionsBuilder) BucketSize ¶

func (iob *IndexOptionsBuilder) BucketSize(bucketSize int32) *IndexOptionsBuilder

BucketSize specifies a value for the bucketSize option.

Deprecated: Use the IndexOptions.SetBucketSize function in mongo/options instead.

func (*IndexOptionsBuilder) Build ¶

func (iob *IndexOptionsBuilder) Build() bson.D

Build finishes constructing an the builder.

Deprecated: Use the IndexOptions type in the mongo/options package instead.

func (*IndexOptionsBuilder) Collation ¶

func (iob *IndexOptionsBuilder) Collation(collation interface{}) *IndexOptionsBuilder

Collation specifies a value for the collation option.

Deprecated: Use the IndexOptions.SetCollation function in mongo/options instead.

func (*IndexOptionsBuilder) DefaultLanguage ¶

func (iob *IndexOptionsBuilder) DefaultLanguage(defaultLanguage string) *IndexOptionsBuilder

DefaultLanguage specifies a value for the default_language option.

Deprecated: Use the IndexOptions.SetDefaultLanguage function in mongo/options instead.

func (*IndexOptionsBuilder) ExpireAfterSeconds ¶

func (iob *IndexOptionsBuilder) ExpireAfterSeconds(expireAfterSeconds int32) *IndexOptionsBuilder

ExpireAfterSeconds specifies a value for the expireAfterSeconds option.

Deprecated: Use the IndexOptions.SetExpireAfterSeconds function in mongo/options instead.

func (*IndexOptionsBuilder) LanguageOverride ¶

func (iob *IndexOptionsBuilder) LanguageOverride(languageOverride string) *IndexOptionsBuilder

LanguageOverride specifies a value for the language_override option.

Deprecated: Use the IndexOptions.SetLanguageOverride function in mongo/options instead.

func (*IndexOptionsBuilder) Max ¶

func (iob *IndexOptionsBuilder) Max(max float64) *IndexOptionsBuilder

Max specifies a value for the max option.

Deprecated: Use the IndexOptions.SetMax function in mongo/options instead.

func (*IndexOptionsBuilder) Min ¶

func (iob *IndexOptionsBuilder) Min(min float64) *IndexOptionsBuilder

Min specifies a value for the min option.

Deprecated: Use the IndexOptions.SetMin function in mongo/options instead.

func (*IndexOptionsBuilder) Name ¶

func (iob *IndexOptionsBuilder) Name(name string) *IndexOptionsBuilder

Name specifies a value for the name option.

Deprecated: Use the IndexOptions.SetName function in mongo/options instead.

func (*IndexOptionsBuilder) PartialFilterExpression ¶

func (iob *IndexOptionsBuilder) PartialFilterExpression(partialFilterExpression interface{}) *IndexOptionsBuilder

PartialFilterExpression specifies a value for the partialFilterExpression option.

Deprecated: Use the IndexOptions.SetPartialFilterExpression function in mongo/options instead.

func (*IndexOptionsBuilder) Sparse ¶

func (iob *IndexOptionsBuilder) Sparse(sparse bool) *IndexOptionsBuilder

Sparse specifies a value for the sparse option.

Deprecated: Use the IndexOptions.SetSparse function in mongo/options instead.

func (*IndexOptionsBuilder) SphereVersion ¶

func (iob *IndexOptionsBuilder) SphereVersion(sphereVersion int32) *IndexOptionsBuilder

SphereVersion specifies a value for the 2dsphereIndexVersion option.

Deprecated: Use the IndexOptions.SetSphereVersion function in mongo/options instead.

func (*IndexOptionsBuilder) StorageEngine ¶

func (iob *IndexOptionsBuilder) StorageEngine(storageEngine interface{}) *IndexOptionsBuilder

StorageEngine specifies a value for the storageEngine option.

Deprecated: Use the IndexOptions.SetStorageEngine function in mongo/options instead.

func (*IndexOptionsBuilder) TextVersion ¶

func (iob *IndexOptionsBuilder) TextVersion(textVersion int32) *IndexOptionsBuilder

TextVersion specifies a value for the textIndexVersion option.

Deprecated: Use the IndexOptions.SetTextVersion function in mongo/options instead.

func (*IndexOptionsBuilder) Unique ¶

func (iob *IndexOptionsBuilder) Unique(unique bool) *IndexOptionsBuilder

Unique specifies a value for the unique option.

Deprecated: Use the IndexOptions.SetUnique function in mongo/options instead.

func (*IndexOptionsBuilder) Version ¶

func (iob *IndexOptionsBuilder) Version(version int32) *IndexOptionsBuilder

Version specifies a value for the version option.

Deprecated: Use the IndexOptions.SetVersion function in mongo/options instead.

func (*IndexOptionsBuilder) Weights ¶

func (iob *IndexOptionsBuilder) Weights(weights interface{}) *IndexOptionsBuilder

Weights specifies a value for the weights option.

Deprecated: Use the IndexOptions.SetWeights function in mongo/options instead.

type IndexSpecification ¶

IndexSpecification represents an index in a database. This type is returned by the IndexView.ListSpecifications function and is also used in the CollectionSpecification type.

type IndexSpecification struct {
    // The index name.
    Name string

    // The namespace for the index. This is a string in the format "databaseName.collectionName".
    Namespace string

    // The keys specification document for the index.
    KeysDocument bson.Raw

    // The index version.
    Version int32

    // The length of time, in seconds, for documents to remain in the collection. The default value is 0, which means
    // that documents will remain in the collection until they're explicitly deleted or the collection is dropped.
    ExpireAfterSeconds *int32

    // If true, the index will only reference documents that contain the fields specified in the index. The default is
    // false.
    Sparse *bool

    // If true, the collection will not accept insertion or update of documents where the index key value matches an
    // existing value in the index. The default is false.
    Unique *bool

    // The clustered index.
    Clustered *bool
}

func (*IndexSpecification) UnmarshalBSON ¶

func (i *IndexSpecification) UnmarshalBSON(data []byte) error

UnmarshalBSON implements the bson.Unmarshaler interface.

Deprecated: Unmarshaling an IndexSpecification from BSON will not be supported in Go Driver 2.0.

type IndexView ¶

IndexView is a type that can be used to create, drop, and list indexes on a collection. An IndexView for a collection can be created by a call to Collection.Indexes().

type IndexView struct {
    // contains filtered or unexported fields
}

func (IndexView) CreateMany ¶

func (iv IndexView) CreateMany(ctx context.Context, models []IndexModel, opts ...*options.CreateIndexesOptions) ([]string, error)

CreateMany executes a createIndexes command to create multiple indexes on the collection and returns the names of the new indexes.

For each IndexModel in the models parameter, the index name can be specified via the Options field. If a name is not given, it will be generated from the Keys document.

The opts parameter can be used to specify options for this operation (see the options.CreateIndexesOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/createIndexes/.

var indexView *mongo.IndexView

// Create two indexes: {name: 1, email: 1} and {name: 1, age: 1}
// For the first index, specify no options. The name will be generated as
// "name_1_email_1" by the driver.
// For the second index, specify the Name option to explicitly set the name
// to "nameAge".
models := []mongo.IndexModel{
    {
        Keys: bson.D{{"name", 1}, {"email", 1}},
    },
    {
        Keys:    bson.D{{"name", 1}, {"age", 1}},
        Options: options.Index().SetName("nameAge"),
    },
}

// Specify the MaxTime option to limit the amount of time the operation can
// run on the server
opts := options.CreateIndexes().SetMaxTime(2 * time.Second)
names, err := indexView.CreateMany(context.TODO(), models, opts)
if err != nil {
    log.Fatal(err)
}

fmt.Printf("created indexes %v\n", names)

func (IndexView) CreateOne ¶

func (iv IndexView) CreateOne(ctx context.Context, model IndexModel, opts ...*options.CreateIndexesOptions) (string, error)

CreateOne executes a createIndexes command to create an index on the collection and returns the name of the new index. See the IndexView.CreateMany documentation for more information and an example.

func (IndexView) DropAll ¶

func (iv IndexView) DropAll(ctx context.Context, opts ...*options.DropIndexesOptions) (bson.Raw, error)

DropAll executes a dropIndexes operation to drop all indexes on the collection. If the operation succeeds, this returns a BSON document in the form {nIndexesWas: <int32>}. The "nIndexesWas" field in the response contains the number of indexes that existed prior to the drop.

The opts parameter can be used to specify options for this operation (see the options.DropIndexesOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/dropIndexes/.

func (IndexView) DropOne ¶

func (iv IndexView) DropOne(ctx context.Context, name string, opts ...*options.DropIndexesOptions) (bson.Raw, error)

DropOne executes a dropIndexes operation to drop an index on the collection. If the operation succeeds, this returns a BSON document in the form {nIndexesWas: <int32>}. The "nIndexesWas" field in the response contains the number of indexes that existed prior to the drop.

The name parameter should be the name of the index to drop. If the name is "*", ErrMultipleIndexDrop will be returned without running the command because doing so would drop all indexes.

The opts parameter can be used to specify options for this operation (see the options.DropIndexesOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/dropIndexes/.

func (IndexView) List ¶

func (iv IndexView) List(ctx context.Context, opts ...*options.ListIndexesOptions) (*Cursor, error)

List executes a listIndexes command and returns a cursor over the indexes in the collection.

The opts parameter can be used to specify options for this operation (see the options.ListIndexesOptions documentation).

For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listIndexes/.

var indexView *mongo.IndexView

// Specify the MaxTime option to limit the amount of time the operation can
// run on the server
opts := options.ListIndexes().SetMaxTime(2 * time.Second)
cursor, err := indexView.List(context.TODO(), opts)
if err != nil {
    log.Fatal(err)
}

// Get a slice of all indexes returned and print them out.
var results []bson.M
if err = cursor.All(context.TODO(), &results); err != nil {
    log.Fatal(err)
}
fmt.Println(results)

func (IndexView) ListSpecifications ¶

func (iv IndexView) ListSpecifications(ctx context.Context, opts ...*options.ListIndexesOptions) ([]*IndexSpecification, error)

ListSpecifications executes a List command and returns a slice of returned IndexSpecifications

type InsertManyResult ¶

InsertManyResult is a result type returned by an InsertMany operation.

type InsertManyResult struct {
    // The _id values of the inserted documents. Values generated by the driver will be of type primitive.ObjectID.
    InsertedIDs []interface{}
}

type InsertOneModel ¶

InsertOneModel is used to insert a single document in a BulkWrite operation.

type InsertOneModel struct {
    Document interface{}
}

func NewInsertOneModel ¶

func NewInsertOneModel() *InsertOneModel

NewInsertOneModel creates a new InsertOneModel.

func (*InsertOneModel) SetDocument ¶

func (iom *InsertOneModel) SetDocument(doc interface{}) *InsertOneModel

SetDocument specifies the document to be inserted. The document cannot be nil. If it does not have an _id field when transformed into BSON, one will be added automatically to the marshalled document. The original document will not be modified.

type InsertOneResult ¶

InsertOneResult is the result type returned by an InsertOne operation.

type InsertOneResult struct {
    // The _id of the inserted document. A value generated by the driver will be of type primitive.ObjectID.
    InsertedID interface{}
}

type LabeledError ¶

LabeledError is an interface for errors with labels.

type LabeledError interface {
    error
    // HasErrorLabel returns true if the error contains the specified label.
    HasErrorLabel(string) bool
}

type ListDatabasesResult ¶

ListDatabasesResult is a result of a ListDatabases operation.

type ListDatabasesResult struct {
    // A slice containing one DatabaseSpecification for each database matched by the operation's filter.
    Databases []DatabaseSpecification

    // The total size of the database files of the returned databases in bytes.
    // This will be the sum of the SizeOnDisk field for each specification in Databases.
    TotalSize int64
}

type MarshalError ¶

MarshalError is returned when attempting to marshal a value into a document results in an error.

type MarshalError struct {
    Value interface{}
    Err   error
}

func (MarshalError) Error ¶

func (me MarshalError) Error() string

Error implements the error interface.

type MongocryptError ¶

MongocryptError represents an libmongocrypt error during client-side encryption.

type MongocryptError struct {
    Code    int32
    Message string
}

func (MongocryptError) Error ¶

func (m MongocryptError) Error() string

Error implements the error interface.

type MongocryptdError ¶

MongocryptdError represents an error while communicating with mongocryptd during client-side encryption.

type MongocryptdError struct {
    Wrapped error
}

func (MongocryptdError) Error ¶

func (e MongocryptdError) Error() string

Error implements the error interface.

func (MongocryptdError) Unwrap ¶

func (e MongocryptdError) Unwrap() error

Unwrap returns the underlying error.

type Pipeline ¶

Pipeline is a type that makes creating aggregation pipelines easier. It is a helper and is intended for serializing to BSON.

Example usage:

mongo.Pipeline{
	{{"$group", bson.D{{"_id", "$state"}, {"totalPop", bson.D{{"$sum", "$pop"}}}}}},
	{{"$match", bson.D{{"totalPop", bson.D{{"$gte", 10*1000*1000}}}}}},
}

type Pipeline []bson.D

type ReplaceOneModel ¶

ReplaceOneModel is used to replace at most one document in a BulkWrite operation.

type ReplaceOneModel struct {
    Collation   *options.Collation
    Upsert      *bool
    Filter      interface{}
    Replacement interface{}
    Hint        interface{}
}

func NewReplaceOneModel ¶

func NewReplaceOneModel() *ReplaceOneModel

NewReplaceOneModel creates a new ReplaceOneModel.

func (*ReplaceOneModel) SetCollation ¶

func (rom *ReplaceOneModel) SetCollation(collation *options.Collation) *ReplaceOneModel

SetCollation specifies a collation to use for string comparisons. The default is nil, meaning no collation will be used.

func (*ReplaceOneModel) SetFilter ¶

func (rom *ReplaceOneModel) SetFilter(filter interface{}) *ReplaceOneModel

SetFilter specifies a filter to use to select the document to replace. The filter must be a document containing query operators. It cannot be nil. If the filter matches multiple documents, one will be selected from the matching documents.

func (*ReplaceOneModel) SetHint ¶

func (rom *ReplaceOneModel) SetHint(hint interface{}) *ReplaceOneModel

SetHint specifies the index to use for the operation. This should either be the index name as a string or the index specification as a document. This option is only valid for MongoDB versions >= 4.2. Server versions >= 3.4 will return an error if this option is specified. For server versions < 3.4, the driver will return a client-side error if this option is specified. The driver will return an error if this option is specified during an unacknowledged write operation. The driver will return an error if the hint parameter is a multi-key map. The default value is nil, which means that no hint will be sent.

func (*ReplaceOneModel) SetReplacement ¶

func (rom *ReplaceOneModel) SetReplacement(rep interface{}) *ReplaceOneModel

SetReplacement specifies a document that will be used to replace the selected document. It cannot be nil and cannot contain any update operators (https://www.mongodb.com/docs/manual/reference/operator/update/).

func (*ReplaceOneModel) SetUpsert ¶

func (rom *ReplaceOneModel) SetUpsert(upsert bool) *ReplaceOneModel

SetUpsert specifies whether or not the replacement document should be inserted if no document matching the filter is found. If an upsert is performed, the _id of the upserted document can be retrieved from the UpsertedIDs field of the BulkWriteResult.

type RewrapManyDataKeyResult ¶

RewrapManyDataKeyResult is the result of the bulk write operation used to update the key vault collection with rewrapped data keys.

type RewrapManyDataKeyResult struct {
    *BulkWriteResult
}

type SearchIndexModel ¶

SearchIndexModel represents a new search index to be created.

type SearchIndexModel struct {
    // A document describing the definition for the search index. It cannot be nil.
    // See https://www.mongodb.com/docs/atlas/atlas-search/create-index/ for reference.
    Definition interface{}

    // The search index options.
    Options *options.SearchIndexesOptions
}

type SearchIndexView ¶

SearchIndexView is a type that can be used to create, drop, list and update search indexes on a collection. A SearchIndexView for a collection can be created by a call to Collection.SearchIndexes().

type SearchIndexView struct {
    // contains filtered or unexported fields
}

func (SearchIndexView) CreateMany ¶

func (siv SearchIndexView) CreateMany(
    ctx context.Context,
    models []SearchIndexModel,
    _ ...*options.CreateSearchIndexesOptions,
) ([]string, error)

CreateMany executes a createSearchIndexes command to create multiple search indexes on the collection and returns the names of the new search indexes.

For each SearchIndexModel in the models parameter, the index name can be specified.

The opts parameter can be used to specify options for this operation (see the options.CreateSearchIndexesOptions documentation).

func (SearchIndexView) CreateOne ¶

func (siv SearchIndexView) CreateOne(
    ctx context.Context,
    model SearchIndexModel,
    opts ...*options.CreateSearchIndexesOptions,
) (string, error)

CreateOne executes a createSearchIndexes command to create a search index on the collection and returns the name of the new search index. See the SearchIndexView.CreateMany documentation for more information and an example.

func (SearchIndexView) DropOne ¶

func (siv SearchIndexView) DropOne(
    ctx context.Context,
    name string,
    _ ...*options.DropSearchIndexOptions,
) error

DropOne executes a dropSearchIndexes operation to drop a search index on the collection.

The name parameter should be the name of the search index to drop. If the name is "*", ErrMultipleIndexDrop will be returned without running the command because doing so would drop all search indexes.

The opts parameter can be used to specify options for this operation (see the options.DropSearchIndexOptions documentation).

func (SearchIndexView) List ¶

func (siv SearchIndexView) List(
    ctx context.Context,
    searchIdxOpts *options.SearchIndexesOptions,
    opts ...*options.ListSearchIndexesOptions,
) (*Cursor, error)

List executes a listSearchIndexes command and returns a cursor over the search indexes in the collection.

The name parameter specifies the index name. A nil pointer matches all indexes.

The opts parameter can be used to specify options for this operation (see the options.ListSearchIndexesOptions documentation).

func (SearchIndexView) UpdateOne ¶

func (siv SearchIndexView) UpdateOne(
    ctx context.Context,
    name string,
    definition interface{},
    _ ...*options.UpdateSearchIndexOptions,
) error

UpdateOne executes a updateSearchIndex operation to update a search index on the collection.

The name parameter should be the name of the search index to update.

The definition parameter is a document describing the definition for the search index. It cannot be nil.

The opts parameter can be used to specify options for this operation (see the options.UpdateSearchIndexOptions documentation).

type ServerError ¶

ServerError is the interface implemented by errors returned from the server. Custom implementations of this interface should not be used in production.

type ServerError interface {
    LabeledError
    // HasErrorCode returns true if the error has the specified code.
    HasErrorCode(int) bool
    // HasErrorMessage returns true if the error contains the specified message.
    HasErrorMessage(string) bool
    // HasErrorCodeWithMessage returns true if any of the contained errors have the specified code and message.
    HasErrorCodeWithMessage(int, string) bool
    // contains filtered or unexported methods
}

type Session ¶

Session is an interface that represents a MongoDB logical session. Sessions can be used to enable causal consistency for a group of operations or to execute operations in an ACID transaction. A new Session can be created from a Client instance. A Session created from a Client must only be used to execute operations using that Client or a Database or Collection created from that Client. Custom implementations of this interface should not be used in production. For more information about sessions, and their use cases, see https://www.mongodb.com/docs/manual/reference/server-sessions/, https://www.mongodb.com/docs/manual/core/read-isolation-consistency-recency/#causal-consistency, and https://www.mongodb.com/docs/manual/core/transactions/.

Implementations of Session are not safe for concurrent use by multiple goroutines.

type Session interface {
    // StartTransaction starts a new transaction, configured with the given options, on this
    // session. This method returns an error if there is already a transaction in-progress for this
    // session.
    StartTransaction(...*options.TransactionOptions) error

    // AbortTransaction aborts the active transaction for this session. This method returns an error
    // if there is no active transaction for this session or if the transaction has been committed
    // or aborted.
    AbortTransaction(context.Context) error

    // CommitTransaction commits the active transaction for this session. This method returns an
    // error if there is no active transaction for this session or if the transaction has been
    // aborted.
    CommitTransaction(context.Context) error

    // WithTransaction starts a transaction on this session and runs the fn callback. Errors with
    // the TransientTransactionError and UnknownTransactionCommitResult labels are retried for up to
    // 120 seconds. Inside the callback, the SessionContext must be used as the Context parameter
    // for any operations that should be part of the transaction. If the ctx parameter already has a
    // Session attached to it, it will be replaced by this session. The fn callback may be run
    // multiple times during WithTransaction due to retry attempts, so it must be idempotent.
    // Non-retryable operation errors or any operation errors that occur after the timeout expires
    // will be returned without retrying. If the callback fails, the driver will call
    // AbortTransaction. Because this method must succeed to ensure that server-side resources are
    // properly cleaned up, context deadlines and cancellations will not be respected during this
    // call. For a usage example, see the Client.StartSession method documentation.
    WithTransaction(ctx context.Context, fn func(ctx SessionContext) (interface{}, error),
        opts ...*options.TransactionOptions) (interface{}, error)

    // EndSession aborts any existing transactions and close the session.
    EndSession(context.Context)

    // ClusterTime returns the current cluster time document associated with the session.
    ClusterTime() bson.Raw

    // OperationTime returns the current operation time document associated with the session.
    OperationTime() *primitive.Timestamp

    // Client the Client associated with the session.
    Client() *Client

    // ID returns the current ID document associated with the session. The ID document is in the
    // form {"id": <BSON binary value>}.
    ID() bson.Raw

    // AdvanceClusterTime advances the cluster time for a session. This method returns an error if
    // the session has ended.
    AdvanceClusterTime(bson.Raw) error

    // AdvanceOperationTime advances the operation time for a session. This method returns an error
    // if the session has ended.
    AdvanceOperationTime(*primitive.Timestamp) error
    // contains filtered or unexported methods
}

func SessionFromContext ¶

func SessionFromContext(ctx context.Context) Session

SessionFromContext extracts the mongo.Session object stored in a Context. This can be used on a SessionContext that was created implicitly through one of the callback-based session APIs or explicitly by calling NewSessionContext. If there is no Session stored in the provided Context, nil is returned.

type SessionContext ¶

SessionContext combines the context.Context and mongo.Session interfaces. It should be used as the Context arguments to operations that should be executed in a session.

Implementations of SessionContext are not safe for concurrent use by multiple goroutines.

There are two ways to create a SessionContext and use it in a session/transaction. The first is to use one of the callback-based functions such as WithSession and UseSession. These functions create a SessionContext and pass it to the provided callback. The other is to use NewSessionContext to explicitly create a SessionContext.

type SessionContext interface {
    context.Context
    Session
}

func NewSessionContext ¶

func NewSessionContext(ctx context.Context, sess Session) SessionContext

NewSessionContext creates a new SessionContext associated with the given Context and Session parameters.

var client *mongo.Client

// Create a new Session and SessionContext.
sess, err := client.StartSession()
if err != nil {
    panic(err)
}
defer sess.EndSession(context.TODO())
ctx := mongo.NewSessionContext(context.TODO(), sess)

// Start a transaction and use the mongo.SessionContext as the Context
// parameter for InsertOne and FindOne so both operations are run in the
// transaction.
if err = sess.StartTransaction(); err != nil {
    panic(err)
}

coll := client.Database("db").Collection("coll")
res, err := coll.InsertOne(ctx, bson.D{{"x", 1}})
if err != nil {
    // Abort the transaction after an error. Use context.Background() to
    // ensure that the abort can complete successfully even if the context
    // passed to NewSessionContext is changed to have a timeout.
    _ = sess.AbortTransaction(context.Background())
    panic(err)
}

var result bson.M
err = coll.FindOne(
    ctx,
    bson.D{{"_id", res.InsertedID}},
).Decode(&result)
if err != nil {
    // Abort the transaction after an error. Use context.Background() to
    // ensure that the abort can complete successfully even if the context
    // passed to NewSessionContext is changed to have a timeout.
    _ = sess.AbortTransaction(context.Background())
    panic(err)
}
fmt.Printf("result: %v\n", result)

// Commit the transaction so the inserted document will be stored. Use
// context.Background() to ensure that the commit can complete successfully
// even if the context passed to NewSessionContext is changed to have a
// timeout.
if err = sess.CommitTransaction(context.Background()); err != nil {
    panic(err)
}

type SingleResult ¶

SingleResult represents a single document returned from an operation. If the operation resulted in an error, all SingleResult methods will return that error. If the operation did not return any documents, all SingleResult methods will return ErrNoDocuments.

type SingleResult struct {
    // contains filtered or unexported fields
}

func NewSingleResultFromDocument ¶

func NewSingleResultFromDocument(document interface{}, err error, registry *bsoncodec.Registry) *SingleResult

NewSingleResultFromDocument creates a SingleResult with the provided error, registry, and an underlying Cursor pre-loaded with the provided document, error and registry. If no registry is provided, bson.DefaultRegistry will be used. If an error distinct from the one provided occurs during creation of the SingleResult, that error will be stored on the returned SingleResult.

The document parameter must be a non-nil document.

func (*SingleResult) Decode ¶

func (sr *SingleResult) Decode(v interface{}) error

Decode will unmarshal the document represented by this SingleResult into v. If there was an error from the operation that created this SingleResult, that error will be returned. If the operation returned no documents, Decode will return ErrNoDocuments.

If the operation was successful and returned a document, Decode will return any errors from the unmarshalling process without any modification. If v is nil or is a typed nil, an error will be returned.

func (*SingleResult) DecodeBytes ¶

func (sr *SingleResult) DecodeBytes() (bson.Raw, error)

DecodeBytes will return the document represented by this SingleResult as a bson.Raw. If there was an error from the operation that created this SingleResult, both the result and that error will be returned. If the operation returned no documents, this will return (nil, ErrNoDocuments).

Deprecated: Use SingleResult.Raw instead.

func (*SingleResult) Err ¶

func (sr *SingleResult) Err() error

Err provides a way to check for query errors without calling Decode. Err returns the error, if any, that was encountered while running the operation. If the operation was successful but did not return any documents, Err returns ErrNoDocuments. If this error is not nil, this error will also be returned from Decode.

func (*SingleResult) Raw ¶

func (sr *SingleResult) Raw() (bson.Raw, error)

Raw returns the document represented by this SingleResult as a bson.Raw. If there was an error from the operation that created this SingleResult, both the result and that error will be returned. If the operation returned no documents, this will return (nil, ErrNoDocuments).

type StreamType ¶

StreamType represents the cluster type against which a ChangeStream was created.

type StreamType uint8

These constants represent valid change stream types. A change stream can be initialized over a collection, all collections in a database, or over a cluster.

const (
    CollectionStream StreamType = iota
    DatabaseStream
    ClientStream
)

type UpdateManyModel ¶

UpdateManyModel is used to update multiple documents in a BulkWrite operation.

type UpdateManyModel struct {
    Collation    *options.Collation
    Upsert       *bool
    Filter       interface{}
    Update       interface{}
    ArrayFilters *options.ArrayFilters
    Hint         interface{}
}

func NewUpdateManyModel ¶

func NewUpdateManyModel() *UpdateManyModel

NewUpdateManyModel creates a new UpdateManyModel.

func (*UpdateManyModel) SetArrayFilters ¶

func (umm *UpdateManyModel) SetArrayFilters(filters options.ArrayFilters) *UpdateManyModel

SetArrayFilters specifies a set of filters to determine which elements should be modified when updating an array field.

func (*UpdateManyModel) SetCollation ¶

func (umm *UpdateManyModel) SetCollation(collation *options.Collation) *UpdateManyModel

SetCollation specifies a collation to use for string comparisons. The default is nil, meaning no collation will be used.

func (*UpdateManyModel) SetFilter ¶

func (umm *UpdateManyModel) SetFilter(filter interface{}) *UpdateManyModel

SetFilter specifies a filter to use to select documents to update. The filter must be a document containing query operators. It cannot be nil.

func (*UpdateManyModel) SetHint ¶

func (umm *UpdateManyModel) SetHint(hint interface{}) *UpdateManyModel

SetHint specifies the index to use for the operation. This should either be the index name as a string or the index specification as a document. This option is only valid for MongoDB versions >= 4.2. Server versions >= 3.4 will return an error if this option is specified. For server versions < 3.4, the driver will return a client-side error if this option is specified. The driver will return an error if this option is specified during an unacknowledged write operation. The driver will return an error if the hint parameter is a multi-key map. The default value is nil, which means that no hint will be sent.

func (*UpdateManyModel) SetUpdate ¶

func (umm *UpdateManyModel) SetUpdate(update interface{}) *UpdateManyModel

SetUpdate specifies the modifications to be made to the selected documents. The value must be a document containing update operators (https://www.mongodb.com/docs/manual/reference/operator/update/). It cannot be nil or empty.

func (*UpdateManyModel) SetUpsert ¶

func (umm *UpdateManyModel) SetUpsert(upsert bool) *UpdateManyModel

SetUpsert specifies whether or not a new document should be inserted if no document matching the filter is found. If an upsert is performed, the _id of the upserted document can be retrieved from the UpsertedIDs field of the BulkWriteResult.

type UpdateOneModel ¶

UpdateOneModel is used to update at most one document in a BulkWrite operation.

type UpdateOneModel struct {
    Collation    *options.Collation
    Upsert       *bool
    Filter       interface{}
    Update       interface{}
    ArrayFilters *options.ArrayFilters
    Hint         interface{}
}

func NewUpdateOneModel ¶

func NewUpdateOneModel() *UpdateOneModel

NewUpdateOneModel creates a new UpdateOneModel.

func (*UpdateOneModel) SetArrayFilters ¶

func (uom *UpdateOneModel) SetArrayFilters(filters options.ArrayFilters) *UpdateOneModel

SetArrayFilters specifies a set of filters to determine which elements should be modified when updating an array field.

func (*UpdateOneModel) SetCollation ¶

func (uom *UpdateOneModel) SetCollation(collation *options.Collation) *UpdateOneModel

SetCollation specifies a collation to use for string comparisons. The default is nil, meaning no collation will be used.

func (*UpdateOneModel) SetFilter ¶

func (uom *UpdateOneModel) SetFilter(filter interface{}) *UpdateOneModel

SetFilter specifies a filter to use to select the document to update. The filter must be a document containing query operators. It cannot be nil. If the filter matches multiple documents, one will be selected from the matching documents.

func (*UpdateOneModel) SetHint ¶

func (uom *UpdateOneModel) SetHint(hint interface{}) *UpdateOneModel

SetHint specifies the index to use for the operation. This should either be the index name as a string or the index specification as a document. This option is only valid for MongoDB versions >= 4.2. Server versions >= 3.4 will return an error if this option is specified. For server versions < 3.4, the driver will return a client-side error if this option is specified. The driver will return an error if this option is specified during an unacknowledged write operation. The driver will return an error if the hint parameter is a multi-key map. The default value is nil, which means that no hint will be sent.

func (*UpdateOneModel) SetUpdate ¶

func (uom *UpdateOneModel) SetUpdate(update interface{}) *UpdateOneModel

SetUpdate specifies the modifications to be made to the selected document. The value must be a document containing update operators (https://www.mongodb.com/docs/manual/reference/operator/update/). It cannot be nil or empty.

func (*UpdateOneModel) SetUpsert ¶

func (uom *UpdateOneModel) SetUpsert(upsert bool) *UpdateOneModel

SetUpsert specifies whether or not a new document should be inserted if no document matching the filter is found. If an upsert is performed, the _id of the upserted document can be retrieved from the UpsertedIDs field of the BulkWriteResult.

type UpdateResult ¶

UpdateResult is the result type returned from UpdateOne, UpdateMany, and ReplaceOne operations.

type UpdateResult struct {
    MatchedCount  int64       // The number of documents matched by the filter.
    ModifiedCount int64       // The number of documents modified by the operation.
    UpsertedCount int64       // The number of documents upserted by the operation.
    UpsertedID    interface{} // The _id field of the upserted document, or nil if no upsert was done.
}

func (*UpdateResult) UnmarshalBSON ¶

func (result *UpdateResult) UnmarshalBSON(b []byte) error

UnmarshalBSON implements the bson.Unmarshaler interface.

Deprecated: Unmarshalling an UpdateResult directly from BSON is not supported and may produce different results compared to running Update* operations directly.

type WriteConcernError ¶

WriteConcernError represents a write concern failure during execution of a write operation. This error type is only returned as part of a WriteException or a BulkWriteException.

type WriteConcernError struct {
    Name    string
    Code    int
    Message string
    Details bson.Raw
    Raw     bson.Raw // The original write concern error from the server response.
}

func (WriteConcernError) Error ¶

func (wce WriteConcernError) Error() string

Error implements the error interface.

func (WriteConcernError) IsMaxTimeMSExpiredError ¶

func (wce WriteConcernError) IsMaxTimeMSExpiredError() bool

IsMaxTimeMSExpiredError returns true if the error is a MaxTimeMSExpired error.

type WriteError ¶

WriteError is an error that occurred during execution of a write operation. This error type is only returned as part of a WriteException or BulkWriteException.

type WriteError struct {
    // The index of the write in the slice passed to an InsertMany or BulkWrite operation that caused this error.
    Index int

    Code    int
    Message string
    Details bson.Raw

    // The original write error from the server response.
    Raw bson.Raw
}

func (WriteError) Error ¶

func (we WriteError) Error() string

func (WriteError) HasErrorCode ¶

func (we WriteError) HasErrorCode(code int) bool

HasErrorCode returns true if the error has the specified code.

func (WriteError) HasErrorCodeWithMessage ¶

func (we WriteError) HasErrorCodeWithMessage(code int, message string) bool

HasErrorCodeWithMessage returns true if the error has the specified code and Message contains the specified message.

func (WriteError) HasErrorLabel ¶

func (we WriteError) HasErrorLabel(string) bool

HasErrorLabel returns true if the error contains the specified label. WriteErrors do not contain labels, so we always return false.

func (WriteError) HasErrorMessage ¶

func (we WriteError) HasErrorMessage(message string) bool

HasErrorMessage returns true if the error contains the specified message.

type WriteErrors ¶

WriteErrors is a group of write errors that occurred during execution of a write operation.

type WriteErrors []WriteError

func (WriteErrors) Error ¶

func (we WriteErrors) Error() string

Error implements the error interface.

type WriteException ¶

WriteException is the error type returned by the InsertOne, DeleteOne, DeleteMany, UpdateOne, UpdateMany, and ReplaceOne operations.

type WriteException struct {
    // The write concern error that occurred, or nil if there was none.
    WriteConcernError *WriteConcernError

    // The write errors that occurred during operation execution.
    WriteErrors WriteErrors

    // The categories to which the exception belongs.
    Labels []string

    // The original server response containing the error.
    Raw bson.Raw
}

func (WriteException) Error ¶

func (mwe WriteException) Error() string

Error implements the error interface.

func (WriteException) HasErrorCode ¶

func (mwe WriteException) HasErrorCode(code int) bool

HasErrorCode returns true if the error has the specified code.

func (WriteException) HasErrorCodeWithMessage ¶

func (mwe WriteException) HasErrorCodeWithMessage(code int, message string) bool

HasErrorCodeWithMessage returns true if any of the contained errors have the specified code and message.

func (WriteException) HasErrorLabel ¶

func (mwe WriteException) HasErrorLabel(label string) bool

HasErrorLabel returns true if the error contains the specified label.

func (WriteException) HasErrorMessage ¶

func (mwe WriteException) HasErrorMessage(message string) bool

HasErrorMessage returns true if the error contains the specified message.

type WriteModel ¶

WriteModel is an interface implemented by models that can be used in a BulkWrite operation. Each WriteModel represents a write.

This interface is implemented by InsertOneModel, DeleteOneModel, DeleteManyModel, ReplaceOneModel, UpdateOneModel, and UpdateManyModel. Custom implementations of this interface must not be used.

type WriteModel interface {
    // contains filtered or unexported methods
}

type XSession ¶

XSession is an unstable interface for internal use only.

Deprecated: This interface is unstable because it provides access to a session.Client object, which exists in the "x" package. It should not be used by applications and may be changed or removed in any release.

type XSession interface {
    ClientSession() *session.Client
}

Subdirectories