This requires the DeleteFeatures capability.Data providers abstract the retrieval and writing (where supported)of feature and attribute information from a spatial datasource.check if provider supports type of fieldConstructor for a vector data provider.Default implementation walks all numeric attributes and caches minimaland maximal values. The default SQLOLEDB network packet size is 4096. Application pooling (or OLE DB resource pooling) is on by default. If this property is set to False, SQLOLEDB does not perform OEM/ANSI character conversion on multi-byte character string data. Thereafter set the connection object's Prompt property to adPromptAlways.
The default value of 8192 might cause Failed to reserve contiguous memory errors as well, read more here. The base implementation does nothing,but subclasses can override this method to handoff calculation of aggregates to the provider.Returns any default value clauses which are present at the provider for a specifiedfield index. Also set an explicit timeout as these scenarios might require more time.Use serverName\instanceName as Data Source to use a specific SQL Server instance.
First you need to set the connection object's Prompt property to adPromptAlways. the comment for postgres table).Gets the translated metadata value.iterator for matching features from providerInvalidates the min/max cache.
mutexes) to prevent data corruption.Returns the transaction this data provider is included in, if any.Create an attribute index on the datasourceAn empty encoding string indicates that the provider should automaticallyselect the most appropriate encoding for the data source.Discover the available relations with the given layers.Returns the maximum value of an attributeQgsVectorDataProvider.Capabilities(Union[QgsVectorDataProvider.Capabilities, QgsVectorDataProvider.Capability])QgsVectorDataProvider.Capabilities(QgsVectorDataProvider.Capabilities)Changes attribute values and geometries of existing features. In den folgenden Codeauflistungen wird veranschaulicht, wie Daten mit ADO.NET-Datenanbietern aus einer Datenbank abgerufen werden. change of subset string) will not bereflected in the feature source, therefore it can be safely used for processing in background withouthaving to care about possible changes within provider that may happen concurrently. Parameters. XML, UDT, varchar(max), nvarchar(max), and varbinary(max), include DataTypeCompatibility=80; in the connection string. Prompt for username and password. This might however not be optimal, try to set this value to 4096 instead. Then use the connection string to connect to the database.To use the User Instance functionality you need to enable it on the SQL Server. Then use the connection string to connect to the database.Always Encrypted in System.Data.SqlClient is available only for .NET Framework, not .NET Core. It uses the attached database as the default for the connection.This one is a bit tricky. The data is returned in a … This works only on a local SQL Server instance and only when connecting using windows authentication over local named pipes. Returns an empty stringlist if a provider does not support enum typesor if the given attribute is not an enum type.Will always return FeatureAvailability.FeaturesAvailable orFeatureAvailability.NoFeaturesAvailable.Creates labeling settings, using provider backend specific information.Gets the translated metadata key.Cancels the current reloading of data.Calculates an aggregated value from the layer’s features. If you connect to a database that is being mirrored, your application can take advantage of the drivers ability to automatically redirect connections when a database mirroring failover occurs.
This is done by executing the following command: sp_configure 'user instances enabled', '1'. You can combine this with the other connection strings options available.This one is a bit tricky.
The purpose is to be able to create a full rights SQL Server instance to a user with limited administrative rights on the computer.An availability group must enable read-only routing for this to work.Are you using SQL Server 2005 Express?
TCP is the only supported protocol. If the named database have already been attached, SQL Server does not reattach it. STR sets the standard for data intelligence and global benchmarking, allowing you to compete strategically, plan for the future and understand your customers. If this happens, wait a bit and connect again.Use a read workload when connecting. (7.0) or "General network error.
This in particular determines the order of layer loading.Returns the names of the supported typesQgsVectorDataProvider.NativeType(QgsVectorDataProvider.NativeType)Converts the geometry to the provider type if possible / necessaryReturns a list of available encodings
Please note that the multiple SQL Server instances feature is available only from SQL Server version 2000 and not in any previous versions.
The context connection lets you execute Transact-SQL statements in the same context (connection) that your code was invoked in the first place.This one is usefull when receving errors "sp_setapprole was not invoked correctly." Connection strings for SQL Server 2016. First set the connection object's Provider property to "sqloledb".
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