def testSaveFields(self):
# Create a new memory layer with no fields
myMemoryLayer = QgsVectorLayer(('Point?crs=epsg:4326&index=yes'),
'test', 'memory')
# Add some fields to the layer
myFields = [
QgsField('TestInt', QVariant.Int, 'integer', 2, 0),
QgsField('TestLong', QVariant.LongLong, 'long', -1, 0),
QgsField('TestDbl', QVariant.Double, 'double', 8, 6),
QgsField('TestString', QVariant.String, 'string', 50, 0),
QgsField('TestDate', QVariant.Date, 'date'),
QgsField('TestTime', QVariant.Time, 'time'),
QgsField('TestDateTime', QVariant.DateTime, 'datetime')
]
assert myMemoryLayer.startEditing()
for f in myFields:
assert myMemoryLayer.addAttribute(f)
assert myMemoryLayer.commitChanges()
myMemoryLayer.updateFields()
# Export the layer to a layer-definition-XML
qlr = QgsLayerDefinition.exportLayerDefinitionLayers(
[myMemoryLayer], QgsReadWriteContext())
assert qlr is not None
# Import the layer from the layer-definition-XML
layers = QgsLayerDefinition.loadLayerDefinitionLayers(
qlr, QgsReadWriteContext())
assert layers is not None
myImportedLayer = layers[0]
assert myImportedLayer is not None
# Check for the presence of the fields
importedFields = myImportedLayer.fields()
assert importedFields is not None
for f in myFields:
assert f == importedFields.field(f.name())
def testSaveFields(self):
# Create a new py layerwith no fields
myPyLayer = QgsVectorLayer(
('Point?crs=epsg:4326&index=yes'),
'test',
'pythonprovider')
# Add some fields to the layer
myFields = [QgsField('TestInt', QVariant.Int, 'integer', 2, 0),
QgsField('TestLong', QVariant.LongLong, 'long', -1, 0),
QgsField('TestDbl', QVariant.Double, 'double', 8, 6),
QgsField('TestString', QVariant.String, 'string', 50, 0),
QgsField('TestDate', QVariant.Date, 'date'),
QgsField('TestTime', QVariant.Time, 'time'),
QgsField('TestDateTime', QVariant.DateTime, 'datetime')]
assert myPyLayer.startEditing()
for f in myFields:
assert myPyLayer.addAttribute(f)
assert myPyLayer.commitChanges()
myPyLayer.updateFields()
# Export the layer to a layer-definition-XML
qlr = QgsLayerDefinition.exportLayerDefinitionLayers([myPyLayer], QgsReadWriteContext())
assert qlr is not None
# Import the layer from the layer-definition-XML
layers = QgsLayerDefinition.loadLayerDefinitionLayers(qlr, QgsReadWriteContext())
assert layers is not None
myImportedLayer = layers[0]
assert myImportedLayer is not None
# Check for the presence of the fields
importedFields = myImportedLayer.fields()
assert importedFields is not None
for f in myFields:
assert f == importedFields.field(f.name())
def testSaveFields(self):
# Create a new memory layer with no fields
myMemoryLayer = QgsVectorLayer(('Point?crs=epsg:4326&index=yes'),
'test', 'memory')
# Add some fields to the layer
myFields = [
QgsField('TestInt', QVariant.Int, 'integer', 2, 0),
QgsField('TestLong', QVariant.LongLong, 'long', -1, 0),
QgsField('TestDbl', QVariant.Double, 'double', 8, 6),
QgsField('TestString', QVariant.String, 'string', 50, 0),
QgsField('TestDate', QVariant.Date, 'date'),
QgsField('TestTime', QVariant.Time, 'time'),
QgsField('TestDateTime', QVariant.DateTime, 'datetime'),
QgsField("vallist", QVariant.List, subType=QVariant.Int),
QgsField("stringlist",
QVariant.StringList,
subType=QVariant.String),
QgsField("stringlist2", QVariant.List, subType=QVariant.String),
QgsField("reallist", QVariant.List, subType=QVariant.Double),
QgsField("longlist", QVariant.List, subType=QVariant.LongLong),
QgsField("dict", QVariant.Map)
]
self.assertTrue(myMemoryLayer.startEditing())
for f in myFields:
assert myMemoryLayer.addAttribute(f)
self.assertTrue(myMemoryLayer.commitChanges())
myMemoryLayer.updateFields()
for f in myFields:
self.assertEqual(f, myMemoryLayer.fields().field(f.name()))
# Export the layer to a layer-definition-XML
qlr = QgsLayerDefinition.exportLayerDefinitionLayers(
[myMemoryLayer], QgsReadWriteContext())
self.assertIsNotNone(qlr)
# Import the layer from the layer-definition-XML
layers = QgsLayerDefinition.loadLayerDefinitionLayers(
qlr, QgsReadWriteContext())
self.assertTrue(layers)
myImportedLayer = layers[0]
self.assertIsNotNone(myImportedLayer)
# Check for the presence of the fields
importedFields = myImportedLayer.fields()
for f in myFields:
self.assertEqual(f.name(), importedFields.field(f.name()).name())
if f.name() != 'stringlist2':
self.assertEqual(f.type(),
importedFields.field(f.name()).type())
else:
# we automatically convert List with String subtype to StringList, to match other data providers
self.assertEqual(
importedFields.field(f.name()).type(), QVariant.StringList)
self.assertEqual(f.subType(),
importedFields.field(f.name()).subType())
self.assertEqual(f.precision(),
importedFields.field(f.name()).precision())
self.assertEqual(f.length(),
importedFields.field(f.name()).length())
