QgsVectorLayerFeatureIterator::FetchJoinInfo Struct Reference

Join information prepared for fast attribute id mapping in QgsVectorLayerJoinBuffer::updateFeatureAttributes(). More...

#include <qgsvectorlayerfeatureiterator.h>

Public Member Functions
void	addJoinedAttributesCached (QgsFeature &f, const QVariant &joinValue) const
void	addJoinedAttributesDirect (QgsFeature &f, const QVariant &joinValue) const

Public Attributes
QgsAttributeList	attributes
	Attributes to fetch.
QMap< int, int >	attributesSourceToDestLayerMap
	Mapping from original attribute index to the joined layer index.
int	indexOffset
	At what position the joined fields start.
int	joinField
const QgsVectorLayerJoinInfo *	joinInfo
	Canonical source of information about the join.
QgsFields	joinLayerFields
	Fields from joined layer.
std::shared_ptr< QgsVectorLayerFeatureSource >	joinSource
	Feature source for join.
int	targetField
	Index of field (of this layer) that drives the join.

Detailed Description

Join information prepared for fast attribute id mapping in QgsVectorLayerJoinBuffer::updateFeatureAttributes().

Created in the select() method of QgsVectorLayerJoinBuffer for the joins that contain fetched attributes

Definition at line 174 of file qgsvectorlayerfeatureiterator.h.

Member Function Documentation

addJoinedAttributesCached()

void QgsVectorLayerFeatureIterator::FetchJoinInfo::addJoinedAttributesCached	(	QgsFeature &	f,
		const QVariant &	joinValue
	)		const

Definition at line 1154 of file qgsvectorlayerfeatureiterator.cpp.

addJoinedAttributesDirect()

void QgsVectorLayerFeatureIterator::FetchJoinInfo::addJoinedAttributesDirect	(	QgsFeature &	f,
		const QVariant &	joinValue
	)		const

Definition at line 1172 of file qgsvectorlayerfeatureiterator.cpp.

Member Data Documentation

attributes

QgsAttributeList QgsVectorLayerFeatureIterator::FetchJoinInfo::attributes

Attributes to fetch.

Definition at line 179 of file qgsvectorlayerfeatureiterator.h.

attributesSourceToDestLayerMap

QMap<int, int> QgsVectorLayerFeatureIterator::FetchJoinInfo::attributesSourceToDestLayerMap

Mapping from original attribute index to the joined layer index.

Definition at line 181 of file qgsvectorlayerfeatureiterator.h.

indexOffset

int QgsVectorLayerFeatureIterator::FetchJoinInfo::indexOffset

At what position the joined fields start.

Definition at line 183 of file qgsvectorlayerfeatureiterator.h.

joinField

int QgsVectorLayerFeatureIterator::FetchJoinInfo::joinField

Definition at line 208 of file qgsvectorlayerfeatureiterator.h.

joinInfo

const QgsVectorLayerJoinInfo* QgsVectorLayerFeatureIterator::FetchJoinInfo::joinInfo

Canonical source of information about the join.

Definition at line 177 of file qgsvectorlayerfeatureiterator.h.

joinLayerFields

QgsFields QgsVectorLayerFeatureIterator::FetchJoinInfo::joinLayerFields

Fields from joined layer.

Note

Not available in Python bindings

Since

QGIS 3.20

Definition at line 201 of file qgsvectorlayerfeatureiterator.h.

joinSource

std::shared_ptr< QgsVectorLayerFeatureSource > QgsVectorLayerFeatureIterator::FetchJoinInfo::joinSource

Feature source for join.

Note

Not available in Python bindings

Since

QGIS 3.20

Definition at line 193 of file qgsvectorlayerfeatureiterator.h.

targetField

int QgsVectorLayerFeatureIterator::FetchJoinInfo::targetField

Index of field (of this layer) that drives the join.

Index of field (of the joined layer) must have equal value

Definition at line 205 of file qgsvectorlayerfeatureiterator.h.

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

• /home/fischer/src/qgis-3.38/src/core/vector/qgsvectorlayerfeatureiterator.h
• /home/fischer/src/qgis-3.38/src/core/vector/qgsvectorlayerfeatureiterator.cpp