本文整理汇总了Python中qgis.core.QgsRelation.referencingLayer方法的典型用法代码示例。如果您正苦于以下问题:Python QgsRelation.referencingLayer方法的具体用法?Python QgsRelation.referencingLayer怎么用?Python QgsRelation.referencingLayer使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsRelation
的用法示例。
在下文中一共展示了QgsRelation.referencingLayer方法的3个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: LinkerDock
# 需要导入模块: from qgis.core import QgsRelation [as 别名]
# 或者: from qgis.core.QgsRelation import referencingLayer [as 别名]
class LinkerDock(QDockWidget, Ui_linker, SettingDialog):
def __init__(self, iface):
# QGIS
self.iface = iface
self.settings = MySettings()
self.linkRubber = QgsRubberBand(self.iface.mapCanvas())
self.featureHighlight = None
# Relation management
self.relationManager = QgsProject.instance().relationManager()
self.relationManager.changed.connect(self.loadRelations)
self.relation = QgsRelation()
self.referencingFeature = QgsFeature()
self.relationWidgetWrapper = None
self.editorContext = QgsAttributeEditorContext()
self.editorContext.setVectorLayerTools(self.iface.vectorLayerTools())
# GUI
QDockWidget.__init__(self)
self.setupUi(self)
SettingDialog.__init__(self, MySettings(), False, True)
self.drawButton.setChecked(self.settings.value("drawEnabled"))
self.relationReferenceWidget.setAllowMapIdentification(True)
self.relationReferenceWidget.setEmbedForm(False)
self.mapTool = QgsMapToolIdentifyFeature(self.iface.mapCanvas())
self.mapTool.setButton(self.identifyReferencingFeatureButton)
# Connect signal/slot
self.relationComboBox.currentIndexChanged.connect(self.currentRelationChanged)
self.mapTool.featureIdentified.connect(self.setReferencingFeature)
# load relations at start
self.loadRelations()
def showEvent(self, QShowEvent):
self.drawLink()
def closeEvent(self, e):
self.iface.mapCanvas().unsetMapTool(self.mapTool)
self.linkRubber.reset()
self.deleteHighlight()
self.deleteWrapper()
self.disconnectLayer()
def disconnectLayer(self):
if self.relation.isValid():
self.relation.referencingLayer().editingStarted.disconnect(self.relationEditableChanged)
self.relation.referencingLayer().editingStopped.disconnect(self.relationEditableChanged)
self.relation.referencingLayer().attributeValueChanged.disconnect(self.layerValueChangedOutside)
def runForFeature(self, relationId, layer, feature):
index = self.relationComboBox.findData(relationId)
self.relationComboBox.setCurrentIndex(index)
self.setReferencingFeature(feature)
self.show()
if not layer.isEditable():
self.iface.messageBar().pushMessage("Link It", "Cannot set a new related feature since %s is not editable" % layer.name(), QgsMessageBar.WARNING, 4)
else:
self.relationReferenceWidget.mapIdentification()
@pyqtSlot(name="on_identifyReferencingFeatureButton_clicked")
def activateMapTool(self):
self.iface.mapCanvas().setMapTool(self.mapTool)
def deactivateMapTool(self):
self.iface.mapCanvas().unsetMapTool(self.mapTool)
def loadRelations(self):
self.deleteWrapper()
self.disconnectLayer()
self.relation = QgsRelation()
self.referencingFeature = QgsFeature()
self.relationComboBox.currentIndexChanged.disconnect(self.currentRelationChanged)
self.relationComboBox.clear()
for relation in self.relationManager.referencedRelations():
if relation.referencingLayer().hasGeometryType():
self.relationComboBox.addItem(relation.name(), relation.id())
self.relationComboBox.setCurrentIndex(-1)
self.relationComboBox.currentIndexChanged.connect(self.currentRelationChanged)
self.currentRelationChanged(-1)
def currentRelationChanged(self, index):
# disconnect previous relation
if self.relation.isValid():
try:
self.relation.referencingLayer().editingStarted.disconnect(self.relationEditableChanged)
self.relation.referencingLayer().editingStopped.disconnect(self.relationEditableChanged)
self.relation.referencingLayer().attributeValueChanged.disconnect(self.layerValueChangedOutside)
except TypeError:
pass
self.referencingFeatureLayout.setEnabled(index >= 0)
relationId = self.relationComboBox.itemData(index)
self.relation = self.relationManager.relation(relationId)
self.mapTool.setLayer(self.relation.referencingLayer())
self.setReferencingFeature()
# connect
if self.relation.isValid():
self.relation.referencingLayer().editingStarted.connect(self.relationEditableChanged)
#.........这里部分代码省略.........
示例2: testDuplicateFeature
# 需要导入模块: from qgis.core import QgsRelation [as 别名]
# 或者: from qgis.core.QgsRelation import referencingLayer [as 别名]
def testDuplicateFeature(self):
""" test duplicating a feature """
project = QgsProject().instance()
# LAYERS
# - add first layer (parent)
layer1 = QgsVectorLayer("Point?field=fldtxt:string&field=pkid:integer",
"parentlayer", "memory")
# > check first layer (parent)
self.assertTrue(layer1.isValid())
# - set the value for the copy
layer1.setDefaultValueDefinition(1, QgsDefaultValue("rand(1000,2000)"))
# > check first layer (parent)
self.assertTrue(layer1.isValid())
# - add second layer (child)
layer2 = QgsVectorLayer("Point?field=fldtxt:string&field=id:integer&field=foreign_key:integer",
"childlayer", "memory")
# > check second layer (child)
self.assertTrue(layer2.isValid())
# - add layers
project.addMapLayers([layer1, layer2])
# FEATURES
# - add 2 features on layer1 (parent)
l1f1orig = QgsFeature()
l1f1orig.setFields(layer1.fields())
l1f1orig.setAttributes(["F_l1f1", 100])
l1f2orig = QgsFeature()
l1f2orig.setFields(layer1.fields())
l1f2orig.setAttributes(["F_l1f2", 101])
# > check by adding features
self.assertTrue(layer1.dataProvider().addFeatures([l1f1orig, l1f2orig]))
# add 4 features on layer2 (child)
l2f1orig = QgsFeature()
l2f1orig.setFields(layer2.fields())
l2f1orig.setAttributes(["F_l2f1", 201, 100])
l2f2orig = QgsFeature()
l2f2orig.setFields(layer2.fields())
l2f2orig.setAttributes(["F_l2f2", 202, 100])
l2f3orig = QgsFeature()
l2f3orig.setFields(layer2.fields())
l2f3orig.setAttributes(["F_l2f3", 203, 100])
l2f4orig = QgsFeature()
l2f4orig.setFields(layer2.fields())
l2f4orig.setAttributes(["F_l2f4", 204, 101])
# > check by adding features
self.assertTrue(layer2.dataProvider().addFeatures([l2f1orig, l2f2orig, l2f3orig, l2f4orig]))
# RELATION
# - create the relationmanager
relMgr = project.relationManager()
# - create the relation
rel = QgsRelation()
rel.setId('rel1')
rel.setName('childrel')
rel.setReferencingLayer(layer2.id())
rel.setReferencedLayer(layer1.id())
rel.addFieldPair('foreign_key', 'pkid')
rel.setStrength(QgsRelation.Composition)
# > check relation
self.assertTrue(rel.isValid())
# - add relation
relMgr.addRelation(rel)
# > check if referencedLayer is layer1
self.assertEqual(rel.referencedLayer(), layer1)
# > check if referencingLayer is layer2
self.assertEqual(rel.referencingLayer(), layer2)
# > check if the layers are correct in relation when loading from relationManager
relations = project.relationManager().relations()
relation = relations[list(relations.keys())[0]]
# > check if referencedLayer is layer1
self.assertEqual(relation.referencedLayer(), layer1)
# > check if referencingLayer is layer2
self.assertEqual(relation.referencingLayer(), layer2)
# > check the relatedfeatures
'''
# testoutput 1
print( "\nAll Features and relations")
featit=layer1.getFeatures()
f=QgsFeature()
while featit.nextFeature(f):
print( f.attributes())
childFeature = QgsFeature()
relfeatit=rel.getRelatedFeatures(f)
while relfeatit.nextFeature(childFeature):
print( childFeature.attributes() )
print( "\n--------------------------")
print( "\nFeatures on layer1")
for f in layer1.getFeatures():
print( f.attributes() )
print( "\nFeatures on layer2")
for f in layer2.getFeatures():
print( f.attributes() )
'''
# DUPLICATION
#.........这里部分代码省略.........
示例3: import_in_qgis
# 需要导入模块: from qgis.core import QgsRelation [as 别名]
# 或者: from qgis.core.QgsRelation import referencingLayer [as 别名]
#.........这里部分代码省略.........
relations_1_1.append(rel)
# add 1:N relations
relations_1_n = []
sql = """
select
layer_name, r.parent_pkid, field_related_layer as child_layer, r.child_pkid
from
{0}_ogr_fields_metadata f
join {0}_ogr_layer_relationships r
on r.parent_layer = f.layer_name
and r.child_layer = f.field_related_layer
where
field_category in ('PATH_TO_CHILD_ELEMENT_WITH_LINK', 'PATH_TO_CHILD_ELEMENT_NO_LINK')
and field_max_occurs>1
-- junctions - 1st way
union all
select
layer_name, r.parent_pkid, field_junction_layer as child_layer, 'parent_pkid' as child_pkid
from
{0}_ogr_fields_metadata f
join {0}_ogr_layer_relationships r
on r.parent_layer = f.layer_name
and r.child_layer = f.field_related_layer
where
field_category = 'PATH_TO_CHILD_ELEMENT_WITH_JUNCTION_TABLE'
-- junctions - 2nd way
union all
select
field_related_layer as layer_name, r.child_pkid, field_junction_layer as child_layer, 'child_pkid' as child_pkid
from
{0}_ogr_fields_metadata f
join {0}_ogr_layer_relationships r
on r.parent_layer = f.layer_name
and r.child_layer = f.field_related_layer
where
field_category = 'PATH_TO_CHILD_ELEMENT_WITH_JUNCTION_TABLE'
""".format(schema_s)
l = ds.ExecuteSQL(sql)
if l is not None:
for f in l:
parent_layer = f.GetField("layer_name")
child_layer = f.GetField("child_layer")
if parent_layer not in layers or child_layer not in layers:
continue
rel = QgsRelation()
rel.setId('1_n_' + f.GetField('layer_name') + '_' + f.GetField('child_layer') + '_' + f.GetField('parent_pkid') + '_' + f.GetField('child_pkid'))
rel.setName(f.GetField('child_layer'))
# parent layer
rel.setReferencedLayer(layers[parent_layer]['layer_id'])
# child layer
rel.setReferencingLayer(layers[child_layer]['layer_id'])
# parent, child
rel.addFieldPair(f.GetField('child_pkid'), f.GetField('parent_pkid'))
#rel.addFieldPair(f.GetField('child_pkid'), 'ogc_fid')
if rel.isValid():
relations_1_n.append(rel)
# add relation to layer
layers[f.GetField('layer_name')]['1_n'].append(rel)
for rel in relations_1_1 + relations_1_n:
QgsProject.instance().relationManager().addRelation(rel)
# add "show form" option to 1:1 relations
for rel in relations_1_1:
l = rel.referencingLayer()
idx = rel.referencingFields()[0]
s = QgsEditorWidgetSetup("RelationReference", {'AllowNULL': False,
'ReadOnly': True,
'Relation': rel.id(),
'OrderByValue': False,
'MapIdentification': False,
'AllowAddFeatures': False,
'ShowForm': True})
l.setEditorWidgetSetup(idx, s)
# setup form for layers
for layer, lyr in layers.items():
l = lyr['layer']
fc = l.editFormConfig()
fc.clearTabs()
fc.setLayout(QgsEditFormConfig.TabLayout)
# Add fields
c = QgsAttributeEditorContainer("Main", fc.invisibleRootContainer())
c.setIsGroupBox(False) # a tab
for idx, f in enumerate(l.fields()):
c.addChildElement(QgsAttributeEditorField(f.name(), idx, c))
fc.addTab(c)
# Add 1:N relations
c_1_n = QgsAttributeEditorContainer("1:N links", fc.invisibleRootContainer())
c_1_n.setIsGroupBox(False) # a tab
fc.addTab(c_1_n)
for rel in lyr['1_n']:
c_1_n.addChildElement(QgsAttributeEditorRelation(rel.name(), rel, c_1_n))
l.setEditFormConfig(fc)
install_viewer_on_feature_form(l)