本文整理汇总了Python中qgis.core.QgsVectorLayer.deleteFeatures方法的典型用法代码示例。如果您正苦于以下问题：Python QgsVectorLayer.deleteFeatures方法的具体用法？Python QgsVectorLayer.deleteFeatures怎么用？Python QgsVectorLayer.deleteFeatures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.QgsVectorLayer的用法示例。
在下文中一共展示了QgsVectorLayer.deleteFeatures方法的5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: testPktIntInsert
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import deleteFeatures [as 别名]
def testPktIntInsert(self):
vl = QgsVectorLayer('{} table="qgis_test"."{}" key="pk" sql='.format(self.dbconn, 'bikes_view'), "bikes_view", "postgres")
self.assertTrue(vl.isValid())
f = QgsFeature(vl.fields())
f['pk'] = NULL
f['name'] = 'Cilo'
r, f = vl.dataProvider().addFeatures([f])
self.assertTrue(r)
self.assertNotEqual(f[0]['pk'], NULL, f[0].attributes())
vl.deleteFeatures([f[0].id()])示例2: testPktMapInsert
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import deleteFeatures [as 别名]
def testPktMapInsert(self):
vl = QgsVectorLayer('{} table="qgis_test"."{}" key="obj_id" sql='.format(self.dbconn, 'oid_serial_table'), "oid_serial", "postgres")
self.assertTrue(vl.isValid())
f = QgsFeature(vl.fields())
f['obj_id'] = vl.dataProvider().defaultValueClause(0)
f['name'] = 'Test'
r, f = vl.dataProvider().addFeatures([f])
self.assertTrue(r)
self.assertNotEqual(f[0]['obj_id'], NULL, f[0].attributes())
vl.deleteFeatures([f[0].id()])示例3: testStringArray
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import deleteFeatures [as 别名]
def testStringArray(self):
vl = QgsVectorLayer('%s table="qgis_test"."string_array" sql=' % (self.dbconn), "teststringarray", "postgres")
self.assertTrue(vl.isValid())
fields = vl.dataProvider().fields()
self.assertEqual(fields.at(fields.indexFromName('value')).type(), QVariant.StringList)
self.assertEqual(fields.at(fields.indexFromName('value')).subType(), QVariant.String)
f = next(vl.getFeatures(QgsFeatureRequest()))
value_idx = vl.fields().lookupField('value')
self.assertIsInstance(f.attributes()[value_idx], list)
self.assertEqual(f.attributes()[value_idx], ['a', 'b', 'c'])
new_f = QgsFeature(vl.fields())
new_f['pk'] = NULL
new_f['value'] = ['simple', '"doubleQuote"', "'quote'", 'back\\slash']
r, fs = vl.dataProvider().addFeatures([new_f])
self.assertTrue(r)
new_pk = fs[0]['pk']
self.assertNotEqual(new_pk, NULL, fs[0].attributes())
try:
read_back = vl.getFeature(new_pk)
self.assertEqual(read_back['pk'], new_pk)
self.assertEqual(read_back['value'], new_f['value'])
finally:
self.assertTrue(vl.startEditing())
self.assertTrue(vl.deleteFeatures([new_pk]))
self.assertTrue(vl.commitChanges())示例4: testHstore
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import deleteFeatures [as 别名]
def testHstore(self):
vl = QgsVectorLayer('%s table="qgis_test"."dict" sql=' % (self.dbconn), "testhstore", "postgres")
self.assertTrue(vl.isValid())
fields = vl.dataProvider().fields()
self.assertEqual(fields.at(fields.indexFromName('value')).type(), QVariant.Map)
f = next(vl.getFeatures(QgsFeatureRequest()))
value_idx = vl.fields().lookupField('value')
self.assertIsInstance(f.attributes()[value_idx], dict)
self.assertEqual(f.attributes()[value_idx], {'a': 'b', '1': '2'})
new_f = QgsFeature(vl.fields())
new_f['pk'] = NULL
new_f['value'] = {'simple': '1', 'doubleQuote': '"y"', 'quote': "'q'", 'backslash': '\\'}
r, fs = vl.dataProvider().addFeatures([new_f])
self.assertTrue(r)
new_pk = fs[0]['pk']
self.assertNotEqual(new_pk, NULL, fs[0].attributes())
try:
read_back = vl.getFeature(new_pk)
self.assertEqual(read_back['pk'], new_pk)
self.assertEqual(read_back['value'], new_f['value'])
finally:
self.assertTrue(vl.startEditing())
self.assertTrue(vl.deleteFeatures([new_pk]))
self.assertTrue(vl.commitChanges())示例5: testHstore
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import deleteFeatures [as 别名]
def testHstore(self):
vl = QgsVectorLayer('%s table="qgis_test"."dict" sql=' % (self.dbconn), "testhstore", "postgres")
self.assertTrue(vl.isValid())
fields = vl.dataProvider().fields()
self.assertEqual(fields.at(fields.indexFromName("value")).type(), QVariant.Map)
f = next(vl.getFeatures(QgsFeatureRequest()))
value_idx = vl.fields().lookupField("value")
self.assertIsInstance(f.attributes()[value_idx], dict)
self.assertEqual(f.attributes()[value_idx], {"a": "b", "1": "2"})
new_f = QgsFeature(vl.fields())
new_f["pk"] = NULL
new_f["value"] = {"simple": "1", "doubleQuote": '"y"', "quote": "'q'", "backslash": "\\"}
r, fs = vl.dataProvider().addFeatures([new_f])
self.assertTrue(r)
new_pk = fs[0]["pk"]
self.assertNotEqual(new_pk, NULL, fs[0].attributes())
try:
read_back = vl.getFeature(new_pk)
self.assertEqual(read_back["pk"], new_pk)
self.assertEqual(read_back["value"], new_f["value"])
finally:
self.assertTrue(vl.startEditing())
self.assertTrue(vl.deleteFeatures([new_pk]))
self.assertTrue(vl.commitChanges())