Defines left outer join from our vector layer to some other vector layer. More...

#include <qgsvectorlayerjoininfo.h>

Public Member Functions
	QgsVectorLayerJoinInfo ()=default
	Constructor for QgsVectorLayerJoinInfo. More...

QgsFeature	extractJoinedFeature (const QgsFeature &feature) const
	Extract the join feature from the target feature for the current join layer information. More...

bool	hasCascadedDelete () const
	Returns whether a feature deleted on the target layer has to impact the joined layer by deleting the corresponding joined feature. More...

bool	hasSubset (bool blacklisted=true) const
	Returns `true` if blacklisted fields is not empty or if a subset of names has been set. More...

bool	hasUpsertOnEdit () const
	Returns whether a feature created on the target layer has to impact the joined layer by creating a new feature if necessary. More...

bool	isDynamicFormEnabled () const
	Returns whether the form has to be dynamically updated with joined fields when a feature is being created in the target layer. More...

bool	isEditable () const
	Returns whether joined fields may be edited through the form of the target layer. More...

bool	isUsingMemoryCache () const
	Returns whether values from the joined layer should be cached in memory to speed up lookups. More...

QString	joinFieldName () const
	Returns name of the field of joined layer that will be used for join. More...

QStringList	joinFieldNamesBlackList () const
	Returns the list of fields to ignore. More...

QStringList *	joinFieldNamesSubset () const
	Returns the subset of fields to be used from joined layer. More...

QgsVectorLayer *	joinLayer () const
	Returns joined layer (may be `nullptr` if the reference was set by layer ID and not resolved yet) More...

QString	joinLayerId () const
	ID of the joined layer - may be used to resolve reference to the joined layer. More...

bool	operator== (const QgsVectorLayerJoinInfo &other) const

QString	prefix () const
	Returns prefix of fields from the joined layer. If `nullptr`, joined layer's name will be used. More...

QString	prefixedFieldName (const QgsField &field) const
	Returns the prefixed name of the field. More...

void	setCascadedDelete (bool enabled)
	Sets whether a feature deleted on the target layer has to impact the joined layer by deleting the corresponding joined feature. More...

void	setDynamicFormEnabled (bool enabled)
	Sets whether the form has to be dynamically updated with joined fields when a feature is being created in the target layer. More...

void	setEditable (bool enabled)
	Sets whether the form of the target layer allows editing joined fields. More...

void	setJoinFieldName (const QString &fieldName)
	Sets name of the field of joined layer that will be used for join. More...

void	setJoinFieldNamesBlackList (const QStringList &blackList)
	Sets a list of fields to ignore whatever happens. More...

void	setJoinFieldNamesSubset (QStringList *fieldNamesSubset)
	Sets the subset of fields to be used from joined layer. More...

void	setJoinLayer (QgsVectorLayer *layer)
	Sets weak reference to the joined layer. More...

void	setJoinLayerId (const QString &layerId)
	Sets ID of the joined layer. It will need to be overwritten by setJoinLayer() to a reference to real layer. More...

void	setPrefix (const QString &prefix)
	Sets prefix of fields from the joined layer. If `nullptr`, joined layer's name will be used. More...

void	setTargetFieldName (const QString &fieldName)
	Sets name of the field of our layer that will be used for join. More...

void	setUpsertOnEdit (bool enabled)
	Sets whether a feature created on the target layer has to impact the joined layer by creating a new feature if necessary. More...

void	setUsingMemoryCache (bool enabled)
	Sets whether values from the joined layer should be cached in memory to speed up lookups. More...

QString	targetFieldName () const
	Returns name of the field of our layer that will be used for join. More...

Static Public Member Functions
static QStringList	joinFieldNamesSubset (const QgsVectorLayerJoinInfo &info, bool blacklisted=true)
	Returns the list of field names to use for joining considering blacklisted fields and subset. More...

Protected Attributes
QHash< QString, QgsAttributes >	cachedAttributes
	Cache for joined attributes to provide fast lookup (size is 0 if no memory caching) More...

bool	cacheDirty = true
	True if the cached join attributes need to be updated. More...

QStringList	mBlackList

bool	mCascadedDelete = false

bool	mDynamicForm = false

bool	mEditable = false

QString	mJoinFieldName
	Join field in the source layer. More...

std::shared_ptr< QStringList >	mJoinFieldsSubset
	Subset of fields to use from joined layer. `nullptr` = use all fields. More...

QgsVectorLayerRef	mJoinLayerRef
	Weak reference to the joined layer. More...

bool	mMemoryCache = false
	True if the join is cached in virtual memory. More...

QString	mPrefix
	An optional prefix. More...

QString	mTargetFieldName
	Join field in the target layer. More...

bool	mUpsertOnEdit = false

Friends
class	QgsVectorLayerFeatureIterator

class	QgsVectorLayerJoinBuffer

Detailed Description

Defines left outer join from our vector layer to some other vector layer.

The join is done based on [our layer].targetField = [join layer].joinField

Since: QGIS 3.0

Definition at line 33 of file qgsvectorlayerjoininfo.h.

Constructor & Destructor Documentation

◆ QgsVectorLayerJoinInfo()

QgsVectorLayerJoinInfo::QgsVectorLayerJoinInfo ( )

default

Constructor for QgsVectorLayerJoinInfo.

Member Function Documentation

◆ extractJoinedFeature()

QgsFeature QgsVectorLayerJoinInfo::extractJoinedFeature ( const QgsFeature & feature ) const

Extract the join feature from the target feature for the current join layer information.

Parameters

feature A feature from the target layer

Returns: the corresponding joined feature

Since: QGIS 3.0

Definition at line 49 of file qgsvectorlayerjoininfo.cpp.

◆ hasCascadedDelete()

bool QgsVectorLayerJoinInfo::hasCascadedDelete ( ) const

inline

Returns whether a feature deleted on the target layer has to impact the joined layer by deleting the corresponding joined feature.

Since: QGIS 3.0

Definition at line 118 of file qgsvectorlayerjoininfo.h.

◆ hasSubset()

bool QgsVectorLayerJoinInfo::hasSubset ( bool blacklisted = true ) const

Returns true if blacklisted fields is not empty or if a subset of names has been set.

Since: QGIS 3.0

Definition at line 110 of file qgsvectorlayerjoininfo.cpp.

◆ hasUpsertOnEdit()

bool QgsVectorLayerJoinInfo::hasUpsertOnEdit ( ) const

inline

Returns whether a feature created on the target layer has to impact the joined layer by creating a new feature if necessary.

Since: QGIS 3.0

Definition at line 104 of file qgsvectorlayerjoininfo.h.

◆ isDynamicFormEnabled()

bool QgsVectorLayerJoinInfo::isDynamicFormEnabled ( ) const

inline

Returns whether the form has to be dynamically updated with joined fields when a feature is being created in the target layer.

Since: QGIS 3.0

Definition at line 77 of file qgsvectorlayerjoininfo.h.

◆ isEditable()

bool QgsVectorLayerJoinInfo::isEditable ( ) const

inline

Returns whether joined fields may be edited through the form of the target layer.

Since: QGIS 3.0

Definition at line 91 of file qgsvectorlayerjoininfo.h.

◆ isUsingMemoryCache()

bool QgsVectorLayerJoinInfo::isUsingMemoryCache ( ) const

inline

Returns whether values from the joined layer should be cached in memory to speed up lookups.

Definition at line 70 of file qgsvectorlayerjoininfo.h.

◆ joinFieldName()

QString QgsVectorLayerJoinInfo::joinFieldName ( ) const

inline

Returns name of the field of joined layer that will be used for join.

Definition at line 60 of file qgsvectorlayerjoininfo.h.

◆ joinFieldNamesBlackList()

QStringList QgsVectorLayerJoinInfo::joinFieldNamesBlackList ( ) const

inline

Returns the list of fields to ignore.

Since: QGIS 3.0

Definition at line 156 of file qgsvectorlayerjoininfo.h.

◆ joinFieldNamesSubset() [1/2]

QStringList QgsVectorLayerJoinInfo::joinFieldNamesSubset	(	const QgsVectorLayerJoinInfo &	info,
		bool	blacklisted = `true`
	)

static

Returns the list of field names to use for joining considering blacklisted fields and subset.

Since: QGIS 3.0

Definition at line 73 of file qgsvectorlayerjoininfo.cpp.

◆ joinFieldNamesSubset() [2/2]

QStringList* QgsVectorLayerJoinInfo::joinFieldNamesSubset ( ) const

inline

Returns the subset of fields to be used from joined layer.

All fields will be used if nullptr is returned.

See also: setJoinFieldNamesSubset()

Since: QGIS 2.6

Definition at line 203 of file qgsvectorlayerjoininfo.h.

◆ joinLayer()

QgsVectorLayer* QgsVectorLayerJoinInfo::joinLayer ( ) const

inline

Returns joined layer (may be nullptr if the reference was set by layer ID and not resolved yet)

Definition at line 45 of file qgsvectorlayerjoininfo.h.

◆ joinLayerId()

QString QgsVectorLayerJoinInfo::joinLayerId ( ) const

inline

ID of the joined layer - may be used to resolve reference to the joined layer.

Definition at line 50 of file qgsvectorlayerjoininfo.h.

◆ operator==()

bool QgsVectorLayerJoinInfo::operator== ( const QgsVectorLayerJoinInfo & other ) const

inline

Definition at line 174 of file qgsvectorlayerjoininfo.h.

◆ prefix()

QString QgsVectorLayerJoinInfo::prefix ( ) const

inline

Returns prefix of fields from the joined layer. If nullptr, joined layer's name will be used.

Definition at line 65 of file qgsvectorlayerjoininfo.h.

◆ prefixedFieldName()

QString QgsVectorLayerJoinInfo::prefixedFieldName ( const QgsField & field ) const

Returns the prefixed name of the field.

Parameters

field the field

Returns: the prefixed name of the field

Since: QGIS 3.0

Definition at line 21 of file qgsvectorlayerjoininfo.cpp.

◆ setCascadedDelete()

void QgsVectorLayerJoinInfo::setCascadedDelete ( bool enabled )

inline

Sets whether a feature deleted on the target layer has to impact the joined layer by deleting the corresponding joined feature.

Since: QGIS 3.0

Definition at line 125 of file qgsvectorlayerjoininfo.h.

◆ setDynamicFormEnabled()

void QgsVectorLayerJoinInfo::setDynamicFormEnabled ( bool enabled )

inline

Sets whether the form has to be dynamically updated with joined fields when a feature is being created in the target layer.

Since: QGIS 3.0

Definition at line 84 of file qgsvectorlayerjoininfo.h.

◆ setEditable()

void QgsVectorLayerJoinInfo::setEditable ( bool enabled )

Sets whether the form of the target layer allows editing joined fields.

Since: QGIS 3.0

Definition at line 38 of file qgsvectorlayerjoininfo.cpp.

◆ setJoinFieldName()

void QgsVectorLayerJoinInfo::setJoinFieldName ( const QString & fieldName )

inline

Sets name of the field of joined layer that will be used for join.

Definition at line 58 of file qgsvectorlayerjoininfo.h.

◆ setJoinFieldNamesBlackList()

void QgsVectorLayerJoinInfo::setJoinFieldNamesBlackList ( const QStringList & blackList )

inline

Sets a list of fields to ignore whatever happens.

Since: QGIS 3.0

Definition at line 149 of file qgsvectorlayerjoininfo.h.

◆ setJoinFieldNamesSubset()

void QgsVectorLayerJoinInfo::setJoinFieldNamesSubset ( QStringList * fieldNamesSubset )

inline

Sets the subset of fields to be used from joined layer.

Ownership of fileNamesSubset is transferred. A fieldNameSubset of nullptr indicates that all fields should be used.

See also: joinFieldNamesSubset()

Since: QGIS 2.6

Definition at line 192 of file qgsvectorlayerjoininfo.h.

◆ setJoinLayer()

void QgsVectorLayerJoinInfo::setJoinLayer ( QgsVectorLayer * layer )

inline

Sets weak reference to the joined layer.

Definition at line 43 of file qgsvectorlayerjoininfo.h.

◆ setJoinLayerId()

void QgsVectorLayerJoinInfo::setJoinLayerId ( const QString & layerId )

inline

Sets ID of the joined layer. It will need to be overwritten by setJoinLayer() to a reference to real layer.

Definition at line 48 of file qgsvectorlayerjoininfo.h.

◆ setPrefix()

void QgsVectorLayerJoinInfo::setPrefix ( const QString & prefix )

inline

Sets prefix of fields from the joined layer. If nullptr, joined layer's name will be used.

Definition at line 63 of file qgsvectorlayerjoininfo.h.

◆ setTargetFieldName()

void QgsVectorLayerJoinInfo::setTargetFieldName ( const QString & fieldName )

inline

Sets name of the field of our layer that will be used for join.

Definition at line 53 of file qgsvectorlayerjoininfo.h.

◆ setUpsertOnEdit()

void QgsVectorLayerJoinInfo::setUpsertOnEdit ( bool enabled )

inline

Sets whether a feature created on the target layer has to impact the joined layer by creating a new feature if necessary.

Since: QGIS 3.0

Definition at line 111 of file qgsvectorlayerjoininfo.h.

◆ setUsingMemoryCache()

void QgsVectorLayerJoinInfo::setUsingMemoryCache ( bool enabled )

inline

Sets whether values from the joined layer should be cached in memory to speed up lookups.

Definition at line 68 of file qgsvectorlayerjoininfo.h.

◆ targetFieldName()

QString QgsVectorLayerJoinInfo::targetFieldName ( ) const

inline

Returns name of the field of our layer that will be used for join.

Definition at line 55 of file qgsvectorlayerjoininfo.h.

Friends And Related Function Documentation

◆ QgsVectorLayerFeatureIterator

friend class QgsVectorLayerFeatureIterator

friend

Definition at line 228 of file qgsvectorlayerjoininfo.h.

◆ QgsVectorLayerJoinBuffer

friend class QgsVectorLayerJoinBuffer

friend

Definition at line 227 of file qgsvectorlayerjoininfo.h.

Member Data Documentation

◆ cachedAttributes

QHash< QString, QgsAttributes> QgsVectorLayerJoinInfo::cachedAttributes

protected

Cache for joined attributes to provide fast lookup (size is 0 if no memory caching)

Definition at line 244 of file qgsvectorlayerjoininfo.h.

◆ cacheDirty

bool QgsVectorLayerJoinInfo::cacheDirty = true

protected

True if the cached join attributes need to be updated.

Definition at line 231 of file qgsvectorlayerjoininfo.h.

◆ mBlackList

QStringList QgsVectorLayerJoinInfo::mBlackList

protected

Definition at line 241 of file qgsvectorlayerjoininfo.h.

◆ mCascadedDelete

bool QgsVectorLayerJoinInfo::mCascadedDelete = false

protected

Definition at line 239 of file qgsvectorlayerjoininfo.h.

◆ mDynamicForm

bool QgsVectorLayerJoinInfo::mDynamicForm = false

protected

Definition at line 233 of file qgsvectorlayerjoininfo.h.

◆ mEditable

bool QgsVectorLayerJoinInfo::mEditable = false

protected

Definition at line 235 of file qgsvectorlayerjoininfo.h.

◆ mJoinFieldName

QString QgsVectorLayerJoinInfo::mJoinFieldName

protected

Join field in the source layer.

Definition at line 211 of file qgsvectorlayerjoininfo.h.

◆ mJoinFieldsSubset

std::shared_ptr<QStringList> QgsVectorLayerJoinInfo::mJoinFieldsSubset

protected

Subset of fields to use from joined layer. nullptr = use all fields.

Definition at line 223 of file qgsvectorlayerjoininfo.h.

◆ mJoinLayerRef

QgsVectorLayerRef QgsVectorLayerJoinInfo::mJoinLayerRef

protected

Weak reference to the joined layer.

Definition at line 209 of file qgsvectorlayerjoininfo.h.

◆ mMemoryCache

bool QgsVectorLayerJoinInfo::mMemoryCache = false

protected

True if the join is cached in virtual memory.

Definition at line 220 of file qgsvectorlayerjoininfo.h.

◆ mPrefix

QString QgsVectorLayerJoinInfo::mPrefix

protected

An optional prefix.

If it is a Null string "{layername}_" will be used

Since: QGIS 2.8

Definition at line 217 of file qgsvectorlayerjoininfo.h.

◆ mTargetFieldName

QString QgsVectorLayerJoinInfo::mTargetFieldName

protected

Join field in the target layer.

Definition at line 207 of file qgsvectorlayerjoininfo.h.

◆ mUpsertOnEdit

bool QgsVectorLayerJoinInfo::mUpsertOnEdit = false

protected

Definition at line 237 of file qgsvectorlayerjoininfo.h.

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

/tmp/buildd/qgis-3.8.0+99unstable/src/core/qgsvectorlayerjoininfo.h
/tmp/buildd/qgis-3.8.0+99unstable/src/core/qgsvectorlayerjoininfo.cpp

Public Member Functions

Static Public Member Functions

Protected Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

◆ QgsVectorLayerJoinInfo()

Member Function Documentation

◆ extractJoinedFeature()

◆ hasCascadedDelete()

◆ hasSubset()

◆ hasUpsertOnEdit()

◆ isDynamicFormEnabled()

◆ isEditable()

◆ isUsingMemoryCache()

◆ joinFieldName()

◆ joinFieldNamesBlackList()

◆ joinFieldNamesSubset() [1/2]

◆ joinFieldNamesSubset() [2/2]

◆ joinLayer()

◆ joinLayerId()

◆ operator==()

◆ prefix()

◆ prefixedFieldName()

◆ setCascadedDelete()

◆ setDynamicFormEnabled()

◆ setEditable()

◆ setJoinFieldName()

◆ setJoinFieldNamesBlackList()

◆ setJoinFieldNamesSubset()

◆ setJoinLayer()

◆ setJoinLayerId()

◆ setPrefix()

◆ setTargetFieldName()

◆ setUpsertOnEdit()

◆ setUsingMemoryCache()

◆ targetFieldName()

Friends And Related Function Documentation

◆ QgsVectorLayerFeatureIterator

◆ QgsVectorLayerJoinBuffer

Member Data Documentation

◆ cachedAttributes

◆ cacheDirty

◆ mBlackList

◆ mCascadedDelete

◆ mDynamicForm

◆ mEditable

◆ mJoinFieldName

◆ mJoinFieldsSubset

◆ mJoinLayerRef

◆ mMemoryCache

◆ mPrefix

◆ mTargetFieldName

◆ mUpsertOnEdit