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

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 148 of file qgsvectorlayerfeatureiterator.h.

Member Function Documentation

addJoinedAttributesCached()

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

Definition at line 1074 of file qgsvectorlayerfeatureiterator.cpp.

addJoinedAttributesDirect()

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

Definition at line 1092 of file qgsvectorlayerfeatureiterator.cpp.

Member Data Documentation

attributes

QgsAttributeList QgsVectorLayerFeatureIterator::FetchJoinInfo::attributes

Attributes to fetch.

Definition at line 153 of file qgsvectorlayerfeatureiterator.h.

attributesSourceToDestLayerMap

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

Mapping from original attribute index to the joined layer index.

Definition at line 155 of file qgsvectorlayerfeatureiterator.h.

indexOffset

int QgsVectorLayerFeatureIterator::FetchJoinInfo::indexOffset

At what position the joined fields start.

Definition at line 157 of file qgsvectorlayerfeatureiterator.h.

joinField

int QgsVectorLayerFeatureIterator::FetchJoinInfo::joinField

Definition at line 182 of file qgsvectorlayerfeatureiterator.h.

joinInfo

const QgsVectorLayerJoinInfo* QgsVectorLayerFeatureIterator::FetchJoinInfo::joinInfo

Canonical source of information about the join.

Definition at line 151 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 175 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 167 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 179 of file qgsvectorlayerfeatureiterator.h.

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

• /build/qgis-3.22.4+99unstable/src/core/vector/qgsvectorlayerfeatureiterator.h
• /build/qgis-3.22.4+99unstable/src/core/vector/qgsvectorlayerfeatureiterator.cpp