WriteConcern class
WriteConcern control the acknowledgment of write operations with various paramaters.
Constructors
- WriteConcern({dynamic w, int? wtimeout, bool fsync = true, bool j = true, String? provenance})
-
Creates a WriteConcern object
const
-
WriteConcern.fromMap(Map<
String, Object> writeConcernMap)
Properties
-
command
→ Map<
String, dynamic> -
Gets the getlasterror command for this write concern.
no setter
- fsync → bool
-
Enables or disable fsync() operation before acknowledgement of
the requested write operation.
If
true, wait for mongod instance to write data to disk before returning.final - hashCode → int
-
The hash code for this object.
no setterinherited
- j → bool
-
Enables or disable journaling of the requested write operation before
acknowledgement.
If
true, wait for mongod instance to write data to the on-disk journal before returning.final - provenance → String?
-
A string value indicating where the write concern originated
(known as write concern provenance). The following table shows the
possible values for this field and their significance:
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- w → dynamic
-
Denotes the Write Concern level that takes the following values
(int or String):
final
- wtimeout → int?
-
Specifies a timeout for this Write Concern in milliseconds,
or infinite if equal to 0.
final
Methods
-
asMap(
ServerStatus serverStatus) → Map< String, Object> - To be used starting with journaled engines (Only Wired Tiger, Journal Only) For inMemoryEngine the J option is ignored
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Constants
- ACKNOWLEDGED → const WriteConcern
- acknowledged → const WriteConcern
- Write operations that use this write concern will wait for acknowledgement from the primary server before returning. Exceptions are raised for network issues, and server errors.
- ERRORS_IGNORED → const WriteConcern
- No exceptions are raised, even for network issues.
- FSYNCED → const WriteConcern
- Exceptions are raised for network issues, and server errors; the write operation waits for the server to flush the data to disk.
- JOURNALED → const WriteConcern
- journaled → const WriteConcern
- Exceptions are raised for network issues, and server errors; the write operation waits for the server to group commit to the journal file on disk.
- MAJORITY → const WriteConcern
- majority → const WriteConcern
- Exceptions are raised for network issues, and server errors; waits on a majority of servers for the write operation.
- REPLICA_ACKNOWLEDGED → const WriteConcern
- replicaAcknowledged → const WriteConcern
- Exceptions are raised for network issues, and server errors; waits for at least 2 servers for the write operation.
- UNACKNOWLEDGED → const WriteConcern
- unacknowledged → const WriteConcern
- Write operations that use this write concern will return as soon as the message is written to the socket. Exceptions are raised for network issues, but not server errors.