Class: QgsVectorLayerExporter

class qgis.core.QgsVectorLayerExporter(uri: str, provider: str, fields: QgsFields, geometryType: QgsWkbTypes.Type, crs: QgsCoordinateReferenceSystem, overwrite: bool = False, options: Dict[str, Any] = {}, sinkFlags: Union[QgsFeatureSink.SinkFlags, QgsFeatureSink.SinkFlag] = QgsFeatureSink.SinkFlags())

Bases: QgsFeatureSink

Constructor for QgsVectorLayerExporter.

Parameters
  • uri (str) – URI for destination data source

  • provider (str) – string key for destination data provider

  • fields (QgsFields) – fields to include in created layer

  • geometryType (QgsWkbTypes.Type) – destination geometry type

  • crs (QgsCoordinateReferenceSystem) – desired CRS, or an invalid (default constructed) CRS if not available

  • overwrite (bool = False) – set to True to overwrite any existing data source

  • options (Dict[str) – optional provider dataset options

  • sinkFlags (Union[QgsFeatureSink.SinkFlags) – for how to add features

A convenience class for exporting vector layers to a destination data provider.

QgsVectorLayerExporter can be used in two ways:

# Using a static call to QgsVectorLayerExporter.exportLayer(…) which exports the

entire layer to the destination provider.

# Create an instance of the class and issue calls to addFeature(…)

Methods

addFeature

param feature

addFeatures

param features

errorCode

Returns any encountered error code, or False if no error was encountered.

errorCount

Returns the number of error messages encountered during the export.

errorMessage

Returns any error message encountered during the export.

exportLayer

Writes the contents of vector layer to a different datasource.

flushBuffer

rtype

bool

lastError

rtype

str

Attributes

ErrAttributeCreationFailed

ErrAttributeTypeUnsupported

ErrConnectionFailed

ErrCreateDataSource

ErrCreateLayer

ErrFeatureWriteFailed

ErrInvalidLayer

ErrInvalidProvider

ErrProjection

ErrProviderUnsupportedFeature

ErrUserCanceled

NoError

ErrAttributeCreationFailed = 4
ErrAttributeTypeUnsupported = 3
ErrConnectionFailed = 10
ErrCreateDataSource = 1
ErrCreateLayer = 2
ErrFeatureWriteFailed = 6
ErrInvalidLayer = 7
ErrInvalidProvider = 8
ErrProjection = 5
ErrProviderUnsupportedFeature = 9
ErrUserCanceled = 11
class ExportError

Bases: int

NoError = 0
addFeature(self, feature: QgsFeature, flags: Union[QgsFeatureSink.Flags, QgsFeatureSink.Flag] = QgsFeatureSink.Flags()) → bool
Parameters
Return type

bool

addFeatures(self, features: Iterable[QgsFeature], flags: Union[QgsFeatureSink.Flags, QgsFeatureSink.Flag] = QgsFeatureSink.Flags()) → bool
Parameters
Return type

bool

errorCode(self)QgsVectorLayerExporter.ExportError

Returns any encountered error code, or False if no error was encountered.

See also

errorMessage()

See also

errorCount()

Return type

QgsVectorLayerExporter.ExportError

errorCount(self) → int

Returns the number of error messages encountered during the export.

See also

errorMessage()

See also

errorCode()

Return type

int

errorMessage(self) → str

Returns any error message encountered during the export.

See also

errorCount()

See also

errorCode()

Return type

str

exportLayer(layer: QgsVectorLayer, uri: str, providerKey: str, destCRS: QgsCoordinateReferenceSystem, onlySelected: bool = False, options: Dict[str, Any] = {}, feedback: QgsFeedback = None) → Tuple[QgsVectorLayerExporter.ExportError, str]

Writes the contents of vector layer to a different datasource.

Parameters
  • layer (QgsVectorLayer) – source layer

  • uri (str) – URI for destination data source

  • providerKey (str) – string key for destination data provider

  • destCRS (QgsCoordinateReferenceSystem) – destination CRS, or an invalid (default constructed) CRS if not available

  • onlySelected (bool = False) – set to True to export only selected features

  • errorMessage – if non-null, will be set to any error messages

  • options (Dict[str) – optional provider dataset options

  • feedback (QgsFeedback = None) – optional feedback object to show progress and cancellation of export

Return type

Tuple[QgsVectorLayerExporter.ExportError, str]

Returns

NoError for a successful export, or encountered error

flushBuffer(self) → bool
Return type

bool

lastError(self) → str
Return type

str