The QgsAbstractDatabaseProviderConnection class provides common functionality for DB based connections. More...

#include <qgsabstractdatabaseproviderconnection.h>

Inheritance diagram for QgsAbstractDatabaseProviderConnection:

Classes
struct	QueryResult
	The QueryResult class represents the result of a query executed by execSql() More...

struct	SpatialIndexOptions
	The SpatialIndexOptions contains extra options relating to spatial index creation. More...

struct	SqlVectorLayerOptions
	The SqlVectorLayerOptions stores all information required to create a SQL (query) layer. More...

struct	TableProperty
	The TableProperty class represents a database table or view. More...

Public Types
typedef QFlags< Capability >	Capabilities

enum	Capability { CreateVectorTable = 1 << 1 , DropRasterTable = 1 << 2 , DropVectorTable = 1 << 3 , RenameVectorTable = 1 << 4 , RenameRasterTable = 1 << 5 , CreateSchema = 1 << 6 , DropSchema = 1 << 7 , RenameSchema = 1 << 8 , ExecuteSql = 1 << 9 , Vacuum = 1 << 10 , Tables = 1 << 11 , Schemas = 1 << 12 , SqlLayers = 1 << 13 , TableExists = 1 << 14 , Spatial = 1 << 15 , CreateSpatialIndex = 1 << 16 , SpatialIndexExists = 1 << 17 , DeleteSpatialIndex = 1 << 18 , DeleteField = 1 << 19 , DeleteFieldCascade = 1 << 20 , AddField = 1 << 21 , ListFieldDomains = 1 << 22 , RetrieveFieldDomain = 1 << 23 , SetFieldDomain = 1 << 24 , AddFieldDomain = 1 << 25 , RenameField = 1 << 26 , RetrieveRelationships = 1 << 27 , AddRelationship = 1 << 28 , UpdateRelationship = 1 << 29 , DeleteRelationship = 1 << 30 }
	The Capability enum represents the operations supported by the connection. More...

typedef QFlags< GeometryColumnCapability >	GeometryColumnCapabilities

enum	GeometryColumnCapability { Z = 1 << 1 , M = 1 << 2 , SinglePart = 1 << 3 , Curves = 1 << 4 , SinglePoint = 1 << 5 , SingleLineString = 1 << 6 , SinglePolygon = 1 << 7 , PolyhedralSurfaces = 1 << 8 }
	The GeometryColumnCapability enum represents the geometry column features supported by the connection. More...

enum class	TableFlag : int { Aspatial = 1 << 1 , Vector = 1 << 2 , Raster = 1 << 3 , View = 1 << 4 , MaterializedView = 1 << 5 , Foreign = 1 << 6 , IncludeSystemTables = 1 << 7 }
	Flags for table properties. More...

typedef QFlags< TableFlag >	TableFlags

Public Member Functions
	QgsAbstractDatabaseProviderConnection (const QString &name)
	Creates a new connection with name by reading its configuration from the settings.

	QgsAbstractDatabaseProviderConnection (const QString &uri, const QVariantMap &configuration)
	Creates a new connection from the given uri and configuration.

virtual void	addField (const QgsField &field, const QString &schema, const QString &tableName) const
	Adds a field.

virtual void	addFieldDomain (const QgsFieldDomain &domain, const QString &schema) const
	Adds a new field domain to the database.

virtual void	addRelationship (const QgsWeakRelation &relationship) const
	Adds a new field relationship to the database.

Capabilities	capabilities () const
	Returns connection capabilities.

Qgis::DatabaseProviderConnectionCapabilities2	capabilities2 () const
	Returns extended connection capabilities.

virtual void	createSchema (const QString &name) const
	Creates a new schema with the specified name.

virtual void	createSpatialIndex (const QString &schema, const QString &name, const QgsAbstractDatabaseProviderConnection::SpatialIndexOptions &options=QgsAbstractDatabaseProviderConnection::SpatialIndexOptions()) const
	Creates a spatial index for the database table with given schema and name (schema is ignored if not supported by the backend).

virtual QgsVectorLayer *	createSqlVectorLayer (const SqlVectorLayerOptions &options) const
	Creates and returns a (possibly invalid) vector layer based on the sql statement and optional options.

virtual void	createVectorTable (const QString &schema, const QString &name, const QgsFields &fields, Qgis::WkbType wkbType, const QgsCoordinateReferenceSystem &srs, bool overwrite, const QMap< QString, QVariant > *options) const
	Creates an empty table with name in the given schema (schema is ignored if not supported by the backend).

virtual void	deleteField (const QString &fieldName, const QString &schema, const QString &tableName, bool force=false) const
	Deletes the field with the specified name.

virtual void	deleteRelationship (const QgsWeakRelation &relationship) const
	Deletes an existing relationship in the database.

virtual void	deleteSpatialIndex (const QString &schema, const QString &name, const QString &geometryColumn) const
	Deletes the existing spatial index for the database table with given schema, name and geometryColumn (schema and geometryColumn are ignored if not supported by the backend).

virtual void	dropRasterTable (const QString &schema, const QString &name) const
	Drops a raster table with given schema (schema is ignored if not supported by the backend) and name.

virtual void	dropSchema (const QString &name, bool force=false) const
	Drops an entire schema with the specified name.

virtual void	dropVectorTable (const QString &schema, const QString &name) const
	Drops a vector (or aspatial) table with given schema (schema is ignored if not supported by the backend) and name.

virtual QueryResult	execSql (const QString &sql, QgsFeedback *feedback=nullptr) const
	Executes raw sql and returns the (possibly empty) query results, optionally feedback can be provided.

virtual QList< QList< QVariant > >	executeSql (const QString &sql, QgsFeedback *feedback=nullptr) const
	Executes raw sql and returns the (possibly empty) list of results in a multi-dimensional array, optionally feedback can be provided.

virtual QgsFieldDomain *	fieldDomain (const QString &name) const
	Returns the field domain with the specified name from the provider.

virtual QStringList	fieldDomainNames () const
	Returns a list of field domain names present on the provider.

virtual QgsFields	fields (const QString &schema, const QString &table, QgsFeedback *feedback=nullptr) const
	Returns the fields of a table and schema.

virtual GeometryColumnCapabilities	geometryColumnCapabilities ()
	Returns connection geometry column capabilities (Z, M, SinglePart, Curves).

virtual QSet< QString >	illegalFieldNames () const
	Returns a list of field names which are considered illegal by the connection and should not be used when creating or altering fields.

virtual QList< QgsVectorDataProvider::NativeType >	nativeTypes () const =0
	Returns a list of native types supported by the connection.

QString	providerKey () const
	Returns the provider key.

virtual QgsProviderSqlQueryBuilder *	queryBuilder () const
	Returns a SQL query builder for the connection, which provides an interface for provider-specific creation of SQL queries.

virtual QStringList	relatedTableTypes () const
	Returns a list of the related table types supported by the database format.

virtual QList< QgsWeakRelation >	relationships (const QString &schema=QString(), const QString &tableName=QString()) const
	Returns a list of relationships detected in the database.

virtual void	renameField (const QString &schema, const QString &tableName, const QString &name, const QString &newName) const
	Renames an existing field.

virtual void	renameRasterTable (const QString &schema, const QString &name, const QString &newName) const
	Renames a raster table with given schema (schema is ignored if not supported by the backend) and name.

virtual void	renameSchema (const QString &name, const QString &newName) const
	Renames a schema with the specified name.

virtual void	renameVectorTable (const QString &schema, const QString &name, const QString &newName) const
	Renames a vector or aspatial table with given schema (schema is ignored if not supported by the backend) and name.

virtual QStringList	schemas () const
	Returns information about the existing schemas.

virtual QList< QgsLayerMetadataProviderResult >	searchLayerMetadata (const QgsMetadataSearchContext &searchContext, const QString &searchString=QString(), const QgsRectangle &geographicExtent=QgsRectangle(), QgsFeedback *feedback=nullptr) const
	Search the stored layer metadata in the connection, optionally limiting the search to the metadata identifier, title, abstract, keywords and categories.

virtual void	setFieldAlias (const QString &fieldName, const QString &schema, const QString &tableName, const QString &alias) const
	Sets the alias for the existing field with the specified name.

virtual void	setFieldComment (const QString &fieldName, const QString &schema, const QString &tableName, const QString &comment) const
	Sets the comment for the existing field with the specified name.

virtual void	setFieldDomainName (const QString &fieldName, const QString &schema, const QString &tableName, const QString &domainName) const
	Sets the field domain name for the existing field with the specified name.

virtual bool	spatialIndexExists (const QString &schema, const QString &name, const QString &geometryColumn) const
	Determines whether a spatial index exists for the database table with given schema, name and geometryColumn (schema and geometryColumn are ignored if not supported by the backend).

virtual QMultiMap< Qgis::SqlKeywordCategory, QStringList >	sqlDictionary ()
	Returns a dictionary of SQL keywords supported by the provider.

virtual Qgis::SqlLayerDefinitionCapabilities	sqlLayerDefinitionCapabilities ()
	Returns SQL layer definition capabilities (Filters, GeometryColumn, PrimaryKeys).

virtual SqlVectorLayerOptions	sqlOptions (const QString &layerSource)
	Returns the SQL layer options from a layerSource.

virtual QList< Qgis::FieldDomainType >	supportedFieldDomainTypes () const
	Returns a list of field domain types which are supported by the provider.

virtual Qgis::RelationshipCapabilities	supportedRelationshipCapabilities () const
	Returns the relationship capabilities supported by the provider.

virtual QList< Qgis::RelationshipCardinality >	supportedRelationshipCardinalities () const
	Returns a list of relationship cardinalities which are supported by the provider.

virtual QList< Qgis::RelationshipStrength >	supportedRelationshipStrengths () const
	Returns a list of relationship strengths which are supported by the provider.

virtual QgsAbstractDatabaseProviderConnection::TableProperty	table (const QString &schema, const QString &table, QgsFeedback *feedback=nullptr) const
	Returns information on a table in the given schema.

virtual bool	tableExists (const QString &schema, const QString &name) const
	Checks whether a table name exists in the given schema.

virtual QList< QgsAbstractDatabaseProviderConnection::TableProperty >	tables (const QString &schema=QString(), const QgsAbstractDatabaseProviderConnection::TableFlags &flags=QgsAbstractDatabaseProviderConnection::TableFlags(), QgsFeedback *feedback=nullptr) const
	Returns information on the tables in the given schema.

QList< QgsAbstractDatabaseProviderConnection::TableProperty >	tablesInt (const QString &schema=QString(), const int flags=0) const
	Returns information on the tables in the given schema.

virtual QString	tableUri (const QString &schema, const QString &name) const
	Returns the URI string for the given table and schema.

virtual void	updateRelationship (const QgsWeakRelation &relationship) const
	Updates an existing relationship in the database.

virtual void	vacuum (const QString &schema, const QString &name) const
	Vacuum the database table with given schema and name (schema is ignored if not supported by the backend).

Public Member Functions inherited from QgsAbstractProviderConnection
	QgsAbstractProviderConnection (const QString &name)
	Creates a new connection with name by reading its configuration from the settings.

	QgsAbstractProviderConnection (const QString &uri, const QVariantMap &configuration)
	Creates a new connection from the given uri and configuration.

virtual	~QgsAbstractProviderConnection ()=default

QVariantMap	configuration () const
	Returns the connection configuration parameters.

virtual QIcon	icon () const
	Returns an icon representing the connection.

virtual void	remove (const QString &name) const =0
	Deletes the connection from the settings.

void	setConfiguration (const QVariantMap &configuration)
	Sets the connection configuration.

void	setUri (const QString &uri)
	Sets the connection data source URI to uri.

virtual void	store (const QString &name) const =0
	Stores the connection in the settings.

QString	uri () const
	Returns the connection data source URI string representation.

Protected Attributes
Capabilities	mCapabilities = Capabilities()

Qgis::DatabaseProviderConnectionCapabilities2	mCapabilities2 = Qgis::DatabaseProviderConnectionCapabilities2()

GeometryColumnCapabilities	mGeometryColumnCapabilities = GeometryColumnCapabilities()

QSet< QString >	mIllegalFieldNames

QString	mProviderKey

Qgis::SqlLayerDefinitionCapabilities	mSqlLayerDefinitionCapabilities = Qgis::SqlLayerDefinitionCapabilities()

Detailed Description

The QgsAbstractDatabaseProviderConnection class provides common functionality for DB based connections.

This class performs low level DB operations without asking the user for confirmation or handling currently opened layers and the registry entries, it is responsibility of the client code to keep layers in sync. The class methods will throw exceptions in case the requested operation is not supported or cannot be performed without errors.

Since: QGIS 3.10

Definition at line 47 of file qgsabstractdatabaseproviderconnection.h.

Member Typedef Documentation

◆ Capabilities

typedef QFlags< Capability > QgsAbstractDatabaseProviderConnection::Capabilities

Definition at line 519 of file qgsabstractdatabaseproviderconnection.h.

◆ GeometryColumnCapabilities

typedef QFlags< GeometryColumnCapability > QgsAbstractDatabaseProviderConnection::GeometryColumnCapabilities

Definition at line 541 of file qgsabstractdatabaseproviderconnection.h.

◆ TableFlags

typedef QFlags< TableFlag > QgsAbstractDatabaseProviderConnection::TableFlags

Definition at line 72 of file qgsabstractdatabaseproviderconnection.h.

Member Enumeration Documentation

◆ Capability

enum QgsAbstractDatabaseProviderConnection::Capability

The Capability enum represents the operations supported by the connection.

See also: Qgis::DatabaseProviderConnectionCapability2

Enumerator
CreateVectorTable	Can CREATE a vector (or aspatial) table/layer.
DropRasterTable	Can DROP a raster table/layer.
DropVectorTable	Can DROP a vector (or aspatial) table/layer.
RenameVectorTable	Can RENAME a vector (or aspatial) table/layer.
RenameRasterTable	Can RENAME a raster table/layer.
CreateSchema	Can CREATE a schema.
DropSchema	Can DROP a schema.
RenameSchema	Can RENAME a schema.
ExecuteSql	Can execute raw SQL queries (without returning results)
Vacuum	Can run vacuum.
Tables	Can list tables.
Schemas	Can list schemas (if not set, the connection does not support schemas)
SqlLayers	Can create vector layers from SQL SELECT queries.
TableExists	Can check if table exists.
Spatial	The connection supports spatial tables.
CreateSpatialIndex	The connection can create spatial indices.
SpatialIndexExists	The connection can determine if a spatial index exists.
DeleteSpatialIndex	The connection can delete spatial indices for tables.
DeleteField	Can delete an existing field/column.
DeleteFieldCascade	Can delete an existing field/column with cascade.
AddField	Can add a new field/column.
ListFieldDomains	Can return a list of field domain names via fieldDomainNames() Since QGIS 3.26
RetrieveFieldDomain	Can retrieve field domain details from provider via fieldDomain() Since QGIS 3.26
SetFieldDomain	Can set the domain for an existing field via setFieldDomainName() Since QGIS 3.26
AddFieldDomain	Can add new field domains to the database via addFieldDomain() Since QGIS 3.26
RenameField	Can rename existing fields via renameField() Since QGIS 3.28
RetrieveRelationships	Can retrieve relationships from the database. Since QGIS 3.28
AddRelationship	Can add new relationships to the database via addRelationship() Since QGIS 3.30
UpdateRelationship	Can update existing relationships in the database via updateRelationship() Since QGIS 3.30
DeleteRelationship	Can delete existing relationships from the database via deleteRelationship() Since QGIS 3.30

Definition at line 485 of file qgsabstractdatabaseproviderconnection.h.

◆ GeometryColumnCapability

enum QgsAbstractDatabaseProviderConnection::GeometryColumnCapability

The GeometryColumnCapability enum represents the geometry column features supported by the connection.

Since: QGIS 3.16

Enumerator
Z	Supports Z dimension.
M	Supports M dimension.
SinglePart	Multi and single part types are distinct types. Deprecated since QGIS 3.28 – use the granular SinglePoint/SingleLineString/SinglePolygon capabilities instead.
Curves	Supports curves.
SinglePoint	Supports single point types (as distinct from multi point types) Since QGIS 3.28
SingleLineString	Supports single linestring types (as distinct from multi line types) Since QGIS 3.28
SinglePolygon	Supports single polygon types (as distinct from multi polygon types) Since QGIS 3.28
PolyhedralSurfaces	Supports polyhedral surfaces (PolyhedralSurface, TIN) types (as distinct from multi polygon types) Since QGIS 3.40

Definition at line 527 of file qgsabstractdatabaseproviderconnection.h.

◆ TableFlag

enum class QgsAbstractDatabaseProviderConnection::TableFlag : int

strong

Flags for table properties.

Flags can be useful for filtering the tables returned from tables().

Enumerator
Aspatial	Aspatial table (it does not contain any geometry column)
Vector	Vector table (it does contain one geometry column)
Raster	Raster table.
View	View table.
MaterializedView	Materialized view table.
Foreign	Foreign data wrapper.
IncludeSystemTables	Include system tables. Since QGIS 3.30

Definition at line 60 of file qgsabstractdatabaseproviderconnection.h.

Constructor & Destructor Documentation

◆ QgsAbstractDatabaseProviderConnection() [1/2]

QgsAbstractDatabaseProviderConnection::QgsAbstractDatabaseProviderConnection ( const QString & name )

Creates a new connection with name by reading its configuration from the settings.

If a connection with this name cannot be found, an empty connection will be returned.

Definition at line 27 of file qgsabstractdatabaseproviderconnection.cpp.

◆ QgsAbstractDatabaseProviderConnection() [2/2]

QgsAbstractDatabaseProviderConnection::QgsAbstractDatabaseProviderConnection	(	const QString &	uri,
		const QVariantMap &	configuration
	)

Creates a new connection from the given uri and configuration.

The connection is not automatically stored in the settings.

See also: store()

Definition at line 33 of file qgsabstractdatabaseproviderconnection.cpp.

Member Function Documentation

◆ addField()

void QgsAbstractDatabaseProviderConnection::addField	(	const QgsField &	field,
		const QString &	schema,
		const QString &	tableName
	)		const

virtual

Adds a field.

Parameters

field	specification of the new field
schema	name of the schema (schema is ignored if not supported by the backend).
tableName	name of the table

Note: it is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.16

Definition at line 1217 of file qgsabstractdatabaseproviderconnection.cpp.

◆ addFieldDomain()

void QgsAbstractDatabaseProviderConnection::addFieldDomain	(	const QgsFieldDomain &	domain,
		const QString &	schema
	)		const

virtual

Adds a new field domain to the database.

Parameters

domain	field domain to add
schema	name of the schema (schema is ignored if not supported by the backend).

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.26

Definition at line 1371 of file qgsabstractdatabaseproviderconnection.cpp.

◆ addRelationship()

void QgsAbstractDatabaseProviderConnection::addRelationship ( const QgsWeakRelation & relationship ) const

virtual

Adds a new field relationship to the database.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.30

Definition at line 1392 of file qgsabstractdatabaseproviderconnection.cpp.

◆ capabilities()

QgsAbstractDatabaseProviderConnection::Capabilities QgsAbstractDatabaseProviderConnection::capabilities ( ) const

Returns connection capabilities.

See also: capabilities2()

Definition at line 39 of file qgsabstractdatabaseproviderconnection.cpp.

◆ capabilities2()

Qgis::DatabaseProviderConnectionCapabilities2 QgsAbstractDatabaseProviderConnection::capabilities2 ( ) const

Returns extended connection capabilities.

See also: capabilities()

Since: QGIS 3.32

Definition at line 44 of file qgsabstractdatabaseproviderconnection.cpp.

◆ createSchema()

void QgsAbstractDatabaseProviderConnection::createSchema ( const QString & name ) const

virtual

Creates a new schema with the specified name.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1137 of file qgsabstractdatabaseproviderconnection.cpp.

◆ createSpatialIndex()

void QgsAbstractDatabaseProviderConnection::createSpatialIndex	(	const QString &	schema,
		const QString &	name,
		const QgsAbstractDatabaseProviderConnection::SpatialIndexOptions &	options = `QgsAbstractDatabaseProviderConnection::SpatialIndexOptions()`
	)		const

virtual

Creates a spatial index for the database table with given schema and name (schema is ignored if not supported by the backend).

The options argument can be used to provide extra options controlling the spatial index creation.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.14

Definition at line 1170 of file qgsabstractdatabaseproviderconnection.cpp.

◆ createSqlVectorLayer()

QgsVectorLayer * QgsAbstractDatabaseProviderConnection::createSqlVectorLayer ( const SqlVectorLayerOptions & options ) const

virtual

Creates and returns a (possibly invalid) vector layer based on the sql statement and optional options.

Exceptions

QgsProviderConnectionException if any errors are encountered or if SQL layer creation is not supported.

Since: QGIS 3.22

Definition at line 1175 of file qgsabstractdatabaseproviderconnection.cpp.

◆ createVectorTable()

void QgsAbstractDatabaseProviderConnection::createVectorTable	(	const QString &	schema,
		const QString &	name,
		const QgsFields &	fields,
		Qgis::WkbType	wkbType,
		const QgsCoordinateReferenceSystem &	srs,
		bool	overwrite,
		const QMap< QString, QVariant > *	options
	)		const

virtual

Creates an empty table with name in the given schema (schema is ignored if not supported by the backend).

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1067 of file qgsabstractdatabaseproviderconnection.cpp.

◆ deleteField()

void QgsAbstractDatabaseProviderConnection::deleteField	(	const QString &	fieldName,
		const QString &	schema,
		const QString &	tableName,
		bool	force = `false`
	)		const

virtual

Deletes the field with the specified name.

Parameters

fieldName	name of the field to be deleted
schema	name of the schema (schema is ignored if not supported by the backend).
tableName	name of the table
force	if `true`, a DROP CASCADE will drop all related objects

Note: it is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.16

Definition at line 1192 of file qgsabstractdatabaseproviderconnection.cpp.

◆ deleteRelationship()

void QgsAbstractDatabaseProviderConnection::deleteRelationship ( const QgsWeakRelation & relationship ) const

virtual

Deletes an existing relationship in the database.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.30

Definition at line 1402 of file qgsabstractdatabaseproviderconnection.cpp.

◆ deleteSpatialIndex()

void QgsAbstractDatabaseProviderConnection::deleteSpatialIndex	(	const QString &	schema,
		const QString &	name,
		const QString &	geometryColumn
	)		const

virtual

Deletes the existing spatial index for the database table with given schema, name and geometryColumn (schema and geometryColumn are ignored if not supported by the backend).

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.14

Definition at line 1181 of file qgsabstractdatabaseproviderconnection.cpp.

◆ dropRasterTable()

void QgsAbstractDatabaseProviderConnection::dropRasterTable	(	const QString &	schema,
		const QString &	name
	)		const

virtual

Drops a raster table with given schema (schema is ignored if not supported by the backend) and name.

Note: It is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1132 of file qgsabstractdatabaseproviderconnection.cpp.

◆ dropSchema()

void QgsAbstractDatabaseProviderConnection::dropSchema	(	const QString &	name,
		bool	force = `false`
	)		const

virtual

Drops an entire schema with the specified name.

Parameters

name	name of the schema to be dropped
force	if `true`, a DROP CASCADE will drop all related objects

Note: It is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1142 of file qgsabstractdatabaseproviderconnection.cpp.

◆ dropVectorTable()

void QgsAbstractDatabaseProviderConnection::dropVectorTable	(	const QString &	schema,
		const QString &	name
	)		const

virtual

Drops a vector (or aspatial) table with given schema (schema is ignored if not supported by the backend) and name.

Note: It is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1103 of file qgsabstractdatabaseproviderconnection.cpp.

◆ execSql()

QgsAbstractDatabaseProviderConnection::QueryResult QgsAbstractDatabaseProviderConnection::execSql	(	const QString &	sql,
		QgsFeedback *	feedback = `nullptr`
	)		const

virtual

Executes raw sql and returns the (possibly empty) query results, optionally feedback can be provided.

See also: executeSql()

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.18

Definition at line 1158 of file qgsabstractdatabaseproviderconnection.cpp.

◆ executeSql()

QList< QList< QVariant > > QgsAbstractDatabaseProviderConnection::executeSql	(	const QString &	sql,
		QgsFeedback *	feedback = `nullptr`
	)		const

virtual

Executes raw sql and returns the (possibly empty) list of results in a multi-dimensional array, optionally feedback can be provided.

See also: execSql()

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1152 of file qgsabstractdatabaseproviderconnection.cpp.

◆ fieldDomain()

QgsFieldDomain * QgsAbstractDatabaseProviderConnection::fieldDomain ( const QString & name ) const

virtual

Returns the field domain with the specified name from the provider.

The caller takes ownership of the return object. Will return nullptr if no matching field domain is found.

This is supported on providers with the Capability::RetrieveFieldDomain capability only.

Exceptions

QgsProviderConnectionException if any errors are encountered.

See also: fieldDomainNames()

Since: QGIS 3.26

Definition at line 1360 of file qgsabstractdatabaseproviderconnection.cpp.

◆ fieldDomainNames()

QStringList QgsAbstractDatabaseProviderConnection::fieldDomainNames ( ) const

virtual

Returns a list of field domain names present on the provider.

This is supported on providers with the Capability::ListFieldDomains capability only.

Exceptions

QgsProviderConnectionException if any errors are encountered.

See also: fieldDomain()

Since: QGIS 3.26

Definition at line 1354 of file qgsabstractdatabaseproviderconnection.cpp.

◆ fields()

QgsFields QgsAbstractDatabaseProviderConnection::fields	(	const QString &	schema,
		const QString &	table,
		QgsFeedback *	feedback = `nullptr`
	)		const

virtual

Returns the fields of a table and schema.

Since QGIS 3.32 the optional feedback argument can be used to cancel the request.

Note: the default implementation creates a temporary vector layer, providers may choose to override this method for a greater efficiency of to overcome provider's behavior when the layer does not expose all fields (GPKG for example hides geometry and primary key column).

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.16

Definition at line 1338 of file qgsabstractdatabaseproviderconnection.cpp.

◆ geometryColumnCapabilities()

QgsAbstractDatabaseProviderConnection::GeometryColumnCapabilities QgsAbstractDatabaseProviderConnection::geometryColumnCapabilities ( )

virtual

Returns connection geometry column capabilities (Z, M, SinglePart, Curves).

Since: QGIS 3.16

Definition at line 49 of file qgsabstractdatabaseproviderconnection.cpp.

◆ illegalFieldNames()

QSet< QString > QgsAbstractDatabaseProviderConnection::illegalFieldNames ( ) const

virtual

Returns a list of field names which are considered illegal by the connection and should not be used when creating or altering fields.

Since: QGIS 3.30

Definition at line 1032 of file qgsabstractdatabaseproviderconnection.cpp.

◆ nativeTypes()

virtual QList< QgsVectorDataProvider::NativeType > QgsAbstractDatabaseProviderConnection::nativeTypes ( ) const

pure virtual

Returns a list of native types supported by the connection.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.16

◆ providerKey()

QString QgsAbstractDatabaseProviderConnection::providerKey ( ) const

Returns the provider key.

Since: QGIS 3.16

Definition at line 89 of file qgsabstractdatabaseproviderconnection.cpp.

◆ queryBuilder()

QgsProviderSqlQueryBuilder * QgsAbstractDatabaseProviderConnection::queryBuilder ( ) const

virtual

Returns a SQL query builder for the connection, which provides an interface for provider-specific creation of SQL queries.

The caller takes ownership of the returned object.

Since: QGIS 3.28

Definition at line 1062 of file qgsabstractdatabaseproviderconnection.cpp.

◆ relatedTableTypes()

QStringList QgsAbstractDatabaseProviderConnection::relatedTableTypes ( ) const

virtual

Returns a list of the related table types supported by the database format.

The related table type is a free-form string representing the type of related features, where the exact interpretation is format dependent. For instance, table types from GeoPackage relationships will directly reflect the categories from the GeoPackage related tables extension (i.e. "media", "simple attributes", "features", "attributes" and "tiles").

Since: QGIS 3.30

Definition at line 1057 of file qgsabstractdatabaseproviderconnection.cpp.

◆ relationships()

QList< QgsWeakRelation > QgsAbstractDatabaseProviderConnection::relationships	(	const QString &	schema = `QString()`,
		const QString &	tableName = `QString()`
	)		const

virtual

Returns a list of relationships detected in the database.

This is supported on providers with the Capability::RetrieveRelationships capability only.

If a schema and/or tableName are specified, then only relationships where the specified table forms the left (or "parent" / "referenced") side of the relationship are retrieved.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.28

Definition at line 1386 of file qgsabstractdatabaseproviderconnection.cpp.

◆ renameField()

void QgsAbstractDatabaseProviderConnection::renameField	(	const QString &	schema,
		const QString &	tableName,
		const QString &	name,
		const QString &	newName
	)		const

virtual

Renames an existing field.

Parameters

schema	name of the schema (schema is ignored if not supported by the backend).
tableName	name of the table
name	current name of field
newName	new name for field

Note: it is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.28

Definition at line 1242 of file qgsabstractdatabaseproviderconnection.cpp.

◆ renameRasterTable()

void QgsAbstractDatabaseProviderConnection::renameRasterTable	(	const QString &	schema,
		const QString &	name,
		const QString &	newName
	)		const

virtual

Renames a raster table with given schema (schema is ignored if not supported by the backend) and name.

Note: It is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1098 of file qgsabstractdatabaseproviderconnection.cpp.

◆ renameSchema()

void QgsAbstractDatabaseProviderConnection::renameSchema	(	const QString &	name,
		const QString &	newName
	)		const

virtual

Renames a schema with the specified name.

Raises a QgsProviderConnectionException if any errors are encountered.

Note: it is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1147 of file qgsabstractdatabaseproviderconnection.cpp.

◆ renameVectorTable()

void QgsAbstractDatabaseProviderConnection::renameVectorTable	(	const QString &	schema,
		const QString &	name,
		const QString &	newName
	)		const

virtual

Renames a vector or aspatial table with given schema (schema is ignored if not supported by the backend) and name.

Note: It is responsibility of the caller to handle open layers and registry entries.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1086 of file qgsabstractdatabaseproviderconnection.cpp.

◆ schemas()

QStringList QgsAbstractDatabaseProviderConnection::schemas ( ) const

virtual

Returns information about the existing schemas.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1302 of file qgsabstractdatabaseproviderconnection.cpp.

◆ searchLayerMetadata()

QList< QgsLayerMetadataProviderResult > QgsAbstractDatabaseProviderConnection::searchLayerMetadata	(	const QgsMetadataSearchContext &	searchContext,
		const QString &	searchString = `QString()`,
		const QgsRectangle &	geographicExtent = `QgsRectangle()`,
		QgsFeedback *	feedback = `nullptr`
	)		const

virtual

Search the stored layer metadata in the connection, optionally limiting the search to the metadata identifier, title, abstract, keywords and categories.

searchContext context for the search searchString limit the search to metadata having an extent intersecting geographicExtent, an optional feedback can be used to monitor and control the search process.

The default implementation raises a QgsNotSupportedException, data providers may implement the search functionality.

A QgsProviderConnectionException is raised in case of errors happening during the search for providers that implement the search functionality.

Returns: a (possibly empty) list of QgsLayerMetadataProviderResult, throws a QgsProviderConnectionException if any error occurred during the search.

Exceptions

QgsProviderConnectionException
QgsNotSupportedException

Since: QGIS 3.28

Definition at line 1123 of file qgsabstractdatabaseproviderconnection.cpp.

◆ setFieldAlias()

void QgsAbstractDatabaseProviderConnection::setFieldAlias	(	const QString &	fieldName,
		const QString &	schema,
		const QString &	tableName,
		const QString &	alias
	)		const

virtual

Sets the alias for the existing field with the specified name.

Parameters

fieldName	name of the field to be modified
schema	name of the schema (schema is ignored if not supported by the backend).
tableName	name of the table
alias	alias to set for the field. Set to an empty string to remove a previously set alias.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.32

Definition at line 1376 of file qgsabstractdatabaseproviderconnection.cpp.

◆ setFieldComment()

void QgsAbstractDatabaseProviderConnection::setFieldComment	(	const QString &	fieldName,
		const QString &	schema,
		const QString &	tableName,
		const QString &	comment
	)		const

virtual

Sets the comment for the existing field with the specified name.

Parameters

fieldName	name of the field to be modified
schema	name of the schema (schema is ignored if not supported by the backend).
tableName	name of the table
comment	comment to set for the field. Set to an empty string to remove a previously set comment.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.32

Definition at line 1381 of file qgsabstractdatabaseproviderconnection.cpp.

◆ setFieldDomainName()

void QgsAbstractDatabaseProviderConnection::setFieldDomainName	(	const QString &	fieldName,
		const QString &	schema,
		const QString &	tableName,
		const QString &	domainName
	)		const

virtual

Sets the field domain name for the existing field with the specified name.

Parameters

fieldName	name of the field to be modified
schema	name of the schema (schema is ignored if not supported by the backend).
tableName	name of the table
domainName	name of the domain to set for the field. Must be an existing field domain (see fieldDomainNames()). Set to an empty string to remove a previously set domain.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.26

Definition at line 1366 of file qgsabstractdatabaseproviderconnection.cpp.

◆ spatialIndexExists()

bool QgsAbstractDatabaseProviderConnection::spatialIndexExists	(	const QString &	schema,
		const QString &	name,
		const QString &	geometryColumn
	)		const

virtual

Determines whether a spatial index exists for the database table with given schema, name and geometryColumn (schema and geometryColumn are ignored if not supported by the backend).

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.14

Definition at line 1186 of file qgsabstractdatabaseproviderconnection.cpp.

◆ sqlDictionary()

QMultiMap< Qgis::SqlKeywordCategory, QStringList > QgsAbstractDatabaseProviderConnection::sqlDictionary ( )

virtual

Returns a dictionary of SQL keywords supported by the provider.

The default implementation returns an list of common reserved words under the "Keyword" and "Constant" categories.

Subclasses should add provider- and/or connection- specific words.

Since: QGIS 3.22

Definition at line 94 of file qgsabstractdatabaseproviderconnection.cpp.

◆ sqlLayerDefinitionCapabilities()

Qgis::SqlLayerDefinitionCapabilities QgsAbstractDatabaseProviderConnection::sqlLayerDefinitionCapabilities ( )

virtual

Returns SQL layer definition capabilities (Filters, GeometryColumn, PrimaryKeys).

Since: QGIS 3.22

Definition at line 54 of file qgsabstractdatabaseproviderconnection.cpp.

◆ sqlOptions()

QgsAbstractDatabaseProviderConnection::SqlVectorLayerOptions QgsAbstractDatabaseProviderConnection::sqlOptions ( const QString & layerSource )

virtual

Returns the SQL layer options from a layerSource.

Note: the default implementation returns a default constructed option object.

Exceptions

QgsProviderConnectionException if any errors are encountered or if SQL layer creation is not supported.

Since: QGIS 3.22

Definition at line 1092 of file qgsabstractdatabaseproviderconnection.cpp.

◆ supportedFieldDomainTypes()

QList< Qgis::FieldDomainType > QgsAbstractDatabaseProviderConnection::supportedFieldDomainTypes ( ) const

virtual

Returns a list of field domain types which are supported by the provider.

Since: QGIS 3.28

Definition at line 1037 of file qgsabstractdatabaseproviderconnection.cpp.

◆ supportedRelationshipCapabilities()

Qgis::RelationshipCapabilities QgsAbstractDatabaseProviderConnection::supportedRelationshipCapabilities ( ) const

virtual

Returns the relationship capabilities supported by the provider.

Since: QGIS 3.30

Definition at line 1052 of file qgsabstractdatabaseproviderconnection.cpp.

◆ supportedRelationshipCardinalities()

QList< Qgis::RelationshipCardinality > QgsAbstractDatabaseProviderConnection::supportedRelationshipCardinalities ( ) const

virtual

Returns a list of relationship cardinalities which are supported by the provider.

Since: QGIS 3.30

Definition at line 1042 of file qgsabstractdatabaseproviderconnection.cpp.

◆ supportedRelationshipStrengths()

QList< Qgis::RelationshipStrength > QgsAbstractDatabaseProviderConnection::supportedRelationshipStrengths ( ) const

virtual

Returns a list of relationship strengths which are supported by the provider.

Since: QGIS 3.30

Definition at line 1047 of file qgsabstractdatabaseproviderconnection.cpp.

◆ table()

QgsAbstractDatabaseProviderConnection::TableProperty QgsAbstractDatabaseProviderConnection::table	(	const QString &	schema,
		const QString &	table,
		QgsFeedback *	feedback = `nullptr`
	)		const

virtual

Returns information on a table in the given schema.

Since QGIS 3.32 the optional feedback argument can be used to cancel the request.

Exceptions

QgsProviderConnectionException if any errors are encountered or if the table does not exist.

Note: Not available in Python bindings

Since: QGIS 3.12

Definition at line 1281 of file qgsabstractdatabaseproviderconnection.cpp.

◆ tableExists()

bool QgsAbstractDatabaseProviderConnection::tableExists	(	const QString &	schema,
		const QString &	name
	)		const

virtual

Checks whether a table name exists in the given schema.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1108 of file qgsabstractdatabaseproviderconnection.cpp.

◆ tables()

QList< QgsAbstractDatabaseProviderConnection::TableProperty > QgsAbstractDatabaseProviderConnection::tables	(	const QString &	schema = `QString()`,
		const QgsAbstractDatabaseProviderConnection::TableFlags &	flags = `QgsAbstractDatabaseProviderConnection::TableFlags()`,
		QgsFeedback *	feedback = `nullptr`
	)		const

virtual

Returns information on the tables in the given schema.

Parameters

schema	name of the schema (ignored if not supported by the backend)
flags	filter tables by flags, this option completely overrides search options stored in the connection
feedback	can be used to cancel the request (since QGIS 3.32)

Exceptions

QgsProviderConnectionException if any errors are encountered.

Note: Not available in Python bindings

Definition at line 1274 of file qgsabstractdatabaseproviderconnection.cpp.

◆ tablesInt()

QList< QgsAbstractDatabaseProviderConnection::TableProperty > QgsAbstractDatabaseProviderConnection::tablesInt	(	const QString &	schema = `QString()`,
		const int	flags = `0`
	)		const

Returns information on the tables in the given schema.

Parameters

schema	name of the schema (ignored if not supported by the backend)
flags	filter tables by flags, this option completely overrides search options stored in the connection

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1296 of file qgsabstractdatabaseproviderconnection.cpp.

◆ tableUri()

QString QgsAbstractDatabaseProviderConnection::tableUri	(	const QString &	schema,
		const QString &	name
	)		const

virtual

Returns the URI string for the given table and schema.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.12

Definition at line 60 of file qgsabstractdatabaseproviderconnection.cpp.

◆ updateRelationship()

void QgsAbstractDatabaseProviderConnection::updateRelationship ( const QgsWeakRelation & relationship ) const

virtual

Updates an existing relationship in the database.

Exceptions

QgsProviderConnectionException if any errors are encountered.

Since: QGIS 3.30

Definition at line 1397 of file qgsabstractdatabaseproviderconnection.cpp.

◆ vacuum()

void QgsAbstractDatabaseProviderConnection::vacuum	(	const QString &	schema,
		const QString &	name
	)		const

virtual

Vacuum the database table with given schema and name (schema is ignored if not supported by the backend).

Exceptions

QgsProviderConnectionException if any errors are encountered.

Definition at line 1165 of file qgsabstractdatabaseproviderconnection.cpp.

Member Data Documentation

◆ mCapabilities

Capabilities QgsAbstractDatabaseProviderConnection::mCapabilities = Capabilities()

protected

Definition at line 1148 of file qgsabstractdatabaseproviderconnection.h.

◆ mCapabilities2

Qgis::DatabaseProviderConnectionCapabilities2 QgsAbstractDatabaseProviderConnection::mCapabilities2 = Qgis::DatabaseProviderConnectionCapabilities2()

protected

Definition at line 1149 of file qgsabstractdatabaseproviderconnection.h.

◆ mGeometryColumnCapabilities

GeometryColumnCapabilities QgsAbstractDatabaseProviderConnection::mGeometryColumnCapabilities = GeometryColumnCapabilities()

protected

Definition at line 1151 of file qgsabstractdatabaseproviderconnection.h.

◆ mIllegalFieldNames

QSet<QString> QgsAbstractDatabaseProviderConnection::mIllegalFieldNames

protected

Definition at line 1154 of file qgsabstractdatabaseproviderconnection.h.

◆ mProviderKey

QString QgsAbstractDatabaseProviderConnection::mProviderKey

protected

Definition at line 1153 of file qgsabstractdatabaseproviderconnection.h.

◆ mSqlLayerDefinitionCapabilities

Qgis::SqlLayerDefinitionCapabilities QgsAbstractDatabaseProviderConnection::mSqlLayerDefinitionCapabilities = Qgis::SqlLayerDefinitionCapabilities()

protected

Definition at line 1152 of file qgsabstractdatabaseproviderconnection.h.

The documentation for this class was generated from the following files:

/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/providers/qgsabstractdatabaseproviderconnection.h
/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/providers/qgsabstractdatabaseproviderconnection.cpp

Classes

Public Types

Public Member Functions

Protected Attributes

Detailed Description

Member Typedef Documentation

◆ Capabilities

◆ GeometryColumnCapabilities

◆ TableFlags

Member Enumeration Documentation

◆ Capability

◆ GeometryColumnCapability

◆ TableFlag

Constructor & Destructor Documentation

◆ QgsAbstractDatabaseProviderConnection() [1/2]

◆ QgsAbstractDatabaseProviderConnection() [2/2]

Member Function Documentation

◆ addField()

◆ addFieldDomain()

◆ addRelationship()

◆ capabilities()

◆ capabilities2()

◆ createSchema()

◆ createSpatialIndex()

◆ createSqlVectorLayer()

◆ createVectorTable()

◆ deleteField()

◆ deleteRelationship()

◆ deleteSpatialIndex()

◆ dropRasterTable()

◆ dropSchema()

◆ dropVectorTable()

◆ execSql()

◆ executeSql()

◆ fieldDomain()

◆ fieldDomainNames()

◆ fields()

◆ geometryColumnCapabilities()

◆ illegalFieldNames()

◆ nativeTypes()

◆ providerKey()

◆ queryBuilder()

◆ relatedTableTypes()

◆ relationships()

◆ renameField()

◆ renameRasterTable()

◆ renameSchema()

◆ renameVectorTable()

◆ schemas()

◆ searchLayerMetadata()

◆ setFieldAlias()

◆ setFieldComment()

◆ setFieldDomainName()

◆ spatialIndexExists()

◆ sqlDictionary()

◆ sqlLayerDefinitionCapabilities()

◆ sqlOptions()

◆ supportedFieldDomainTypes()

◆ supportedRelationshipCapabilities()

◆ supportedRelationshipCardinalities()

◆ supportedRelationshipStrengths()

◆ table()

◆ tableExists()

◆ tables()

◆ tablesInt()

◆ tableUri()

◆ updateRelationship()

◆ vacuum()

Member Data Documentation

◆ mCapabilities

◆ mCapabilities2

◆ mGeometryColumnCapabilities

◆ mIllegalFieldNames

◆ mProviderKey

◆ mSqlLayerDefinitionCapabilities