本文整理汇总了Python中qgis.core.QgsVectorLayerUtils.validateAttribute方法的典型用法代码示例。如果您正苦于以下问题：Python QgsVectorLayerUtils.validateAttribute方法的具体用法？Python QgsVectorLayerUtils.validateAttribute怎么用？Python QgsVectorLayerUtils.validateAttribute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.QgsVectorLayerUtils的用法示例。
在下文中一共展示了QgsVectorLayerUtils.validateAttribute方法的2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: testVectorLayerUtilsUniqueWithProviderDefault
# 需要导入模块: from qgis.core import QgsVectorLayerUtils [as 别名]
# 或者: from qgis.core.QgsVectorLayerUtils import validateAttribute [as 别名]
def testVectorLayerUtilsUniqueWithProviderDefault(self):
vl = QgsVectorLayer('%s table="qgis_test"."someData" sql=' % (self.dbconn), "someData", "postgres")
default_clause = 'nextval(\'qgis_test."someData_pk_seq"\'::regclass)'
vl.dataProvider().setProviderProperty(QgsDataProvider.EvaluateDefaultValues, False)
self.assertEqual(vl.dataProvider().defaultValueClause(0), default_clause)
self.assertTrue(QgsVectorLayerUtils.valueExists(vl, 0, 4))
vl.startEditing()
f = QgsFeature(vl.fields())
f.setAttribute(0, default_clause)
self.assertFalse(QgsVectorLayerUtils.valueExists(vl, 0, default_clause))
self.assertTrue(vl.addFeatures([f]))
# the default value clause should exist...
self.assertTrue(QgsVectorLayerUtils.valueExists(vl, 0, default_clause))
# but it should not prevent the attribute being validated
self.assertTrue(QgsVectorLayerUtils.validateAttribute(vl, f, 0))
vl.rollBack()示例2: test_validate_attribute
# 需要导入模块: from qgis.core import QgsVectorLayerUtils [as 别名]
# 或者: from qgis.core.QgsVectorLayerUtils import validateAttribute [as 别名]
def test_validate_attribute(self):
""" test validating attributes against constraints """
layer = createLayerWithOnePoint()
# field expression check
layer.setConstraintExpression(1, 'fldint>5')
f = QgsFeature(2)
f.setAttributes(["test123", 6])
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
f.setAttributes(["test123", 2])
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertFalse(res)
self.assertEqual(len(errors), 1)
print(errors)
# checking only for provider constraints
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1, origin=QgsFieldConstraints.ConstraintOriginProvider)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
# bad field expression check
layer.setConstraintExpression(1, 'fldint>')
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertFalse(res)
self.assertEqual(len(errors), 1)
print(errors)
layer.setConstraintExpression(1, None)
# not null constraint
f.setAttributes(["test123", NULL])
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
layer.setFieldConstraint(1, QgsFieldConstraints.ConstraintNotNull)
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertFalse(res)
self.assertEqual(len(errors), 1)
print(errors)
# checking only for provider constraints
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1, origin=QgsFieldConstraints.ConstraintOriginProvider)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
# unique constraint
f.setAttributes(["test123", 123])
layer.removeFieldConstraint(1, QgsFieldConstraints.ConstraintNotNull)
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
layer.setFieldConstraint(1, QgsFieldConstraints.ConstraintUnique)
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertFalse(res)
self.assertEqual(len(errors), 1)
print(errors)
# checking only for provider constraints
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1, origin=QgsFieldConstraints.ConstraintOriginProvider)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
# checking only for soft constraints
layer.setFieldConstraint(1, QgsFieldConstraints.ConstraintUnique, QgsFieldConstraints.ConstraintStrengthHard)
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1, strength=QgsFieldConstraints.ConstraintStrengthSoft)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
# checking for hard constraints
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1,
strength=QgsFieldConstraints.ConstraintStrengthHard)
self.assertFalse(res)
self.assertEqual(len(errors), 1)
# check - same id should be ignored when testing for uniqueness
f1 = QgsFeature(1)
f1.setAttributes(["test123", 123])
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f1, 1)
self.assertTrue(res)
self.assertEqual(len(errors), 0)
# test double constraint failure
layer.setConstraintExpression(1, 'fldint>5')
layer.removeFieldConstraint(1, QgsFieldConstraints.ConstraintUnique)
layer.setFieldConstraint(1, QgsFieldConstraints.ConstraintNotNull)
f.setAttributes(["test123", NULL])
res, errors = QgsVectorLayerUtils.validateAttribute(layer, f, 1)
self.assertFalse(res)
self.assertEqual(len(errors), 2)
print(errors)