本文整理汇总了Python中qgis.core.QgsVirtualLayerDefinition.addSource方法的典型用法代码示例。如果您正苦于以下问题:Python QgsVirtualLayerDefinition.addSource方法的具体用法?Python QgsVirtualLayerDefinition.addSource怎么用?Python QgsVirtualLayerDefinition.addSource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.QgsVirtualLayerDefinition
的用法示例。
在下文中一共展示了QgsVirtualLayerDefinition.addSource方法的8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: test_source_escaping
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def test_source_escaping(self):
# the source contains ':'
source = QUrl.fromLocalFile(os.path.join(self.testDataDir, "delimitedtext/test.csv")).toString() + "?type=csv&geomType=none&subsetIndex=no&watchFile=no"
d = QgsVirtualLayerDefinition()
d.addSource("t", source, "delimitedtext")
l = QgsVectorLayer(d.toString(), "vtab", "virtual", False)
self.assertEqual(l.isValid(), True)
示例2: test_no_geometry
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def test_no_geometry(self):
df = QgsVirtualLayerDefinition()
df.addSource("vtab", os.path.join(self.testDataDir, "france_parts.shp"), "ogr")
df.setGeometryWkbType(QgsWkbTypes.NoGeometry)
l2 = QgsVectorLayer(df.toString(), "vtab2", "virtual", False)
self.assertEqual(l2.isValid(), True)
self.assertEqual(l2.dataProvider().wkbType(), 100) # NoGeometry
示例3: test_source_escaping2
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def test_source_escaping2(self):
def create_test_db(dbfile):
if os.path.exists(dbfile):
os.remove(dbfile)
con = spatialite_connect(dbfile)
cur = con.cursor()
cur.execute("SELECT InitSpatialMetadata(1)")
cur.execute("CREATE TABLE test (id INTEGER, name TEXT)")
cur.execute("SELECT AddGeometryColumn('test', 'geometry', 4326, 'POINT', 'XY')")
sql = "INSERT INTO test (id, name, geometry) "
sql += "VALUES (1, 'toto',GeomFromText('POINT(0 0)',4326))"
cur.execute(sql)
con.close()
# the source contains ',' and single quotes
fn = os.path.join(tempfile.gettempdir(), "test,.db")
create_test_db(fn)
source = "dbname='%s' table=\"test\" (geometry) sql=" % fn
d = QgsVirtualLayerDefinition()
d.addSource("t", source, "spatialite")
l = QgsVectorLayer(d.toString(), "vtab", "virtual", False)
self.assertEqual(l.isValid(), True)
# the source contains ':' and single quotes
fn = os.path.join(tempfile.gettempdir(), "test:.db")
create_test_db(fn)
source = "dbname='%s' table=\"test\" (geometry) sql=" % fn
d = QgsVirtualLayerDefinition()
d.addSource("t", source, "spatialite")
l = QgsVectorLayer(d.toString(), "vtab", "virtual", False)
self.assertEqual(l.isValid(), True)
示例4: processAlgorithm
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def processAlgorithm(self, feedback):
layers = self.getParameterValue(self.INPUT_DATASOURCES)
query = self.getParameterValue(self.INPUT_QUERY)
uid_field = self.getParameterValue(self.INPUT_UID_FIELD)
geometry_field = self.getParameterValue(self.INPUT_GEOMETRY_FIELD)
geometry_type = self.getParameterValue(self.INPUT_GEOMETRY_TYPE)
geometry_crs = self.getParameterValue(self.INPUT_GEOMETRY_CRS)
df = QgsVirtualLayerDefinition()
layerIdx = 1
if layers:
for layerSource in layers.split(';'):
layer = dataobjects.getObjectFromUri(layerSource)
if layer:
df.addSource('input{}'.format(layerIdx), layer.id())
layerIdx += 1
if query == '':
raise GeoAlgorithmExecutionException(
self.tr('Empty SQL. Please enter valid SQL expression and try again.'))
else:
df.setQuery(query)
if uid_field:
df.setUid(uid_field)
if geometry_type == 1: # no geometry
df.setGeometryWkbType(QgsWkbTypes.NullGeometry)
else:
if geometry_field:
df.setGeometryField(geometry_field)
if geometry_type > 1:
df.setGeometryWkbType(geometry_type - 1)
if geometry_crs:
crs = QgsCoordinateReferenceSystem(geometry_crs)
if crs.isValid():
df.setGeometrySrid(crs.postgisSrid())
vLayer = QgsVectorLayer(df.toString(), "temp_vlayer", "virtual")
if not vLayer.isValid():
raise GeoAlgorithmExecutionException(vLayer.dataProvider().error().message())
writer = self.getOutputFromName(self.OUTPUT_LAYER).getVectorWriter(
vLayer.fields().toList(),
# Create a point layer (without any points) if 'no geometry' is chosen
vLayer.wkbType() if geometry_type != 1 else 1,
vLayer.crs())
features = vector.features(vLayer)
total = 100.0 / len(features)
outFeat = QgsFeature()
for current, inFeat in enumerate(features):
outFeat.setAttributes(inFeat.attributes())
if geometry_type != 1:
outFeat.setGeometry(inFeat.geometry())
writer.addFeature(outFeat)
feedback.setProgress(int(current * total))
del writer
示例5: setUpClass
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def setUpClass(cls):
"""Run before all tests"""
# Create the layer for the common provider tests
shp = os.path.join(TEST_DATA_DIR, 'provider/shapefile.shp')
d = QgsVirtualLayerDefinition()
d.addSource("vtab1", shp, "ogr")
d.setUid("pk")
cls.vl = QgsVectorLayer(d.toString(), u'test', u'virtual')
assert (cls.vl.isValid())
cls.provider = cls.vl.dataProvider()
示例6: processAlgorithm
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def processAlgorithm(self, parameters, context, feedback):
layers = self.parameterAsLayerList(parameters, self.INPUT_DATASOURCES, context)
query = self.parameterAsString(parameters, self.INPUT_QUERY, context)
uid_field = self.parameterAsString(parameters, self.INPUT_UID_FIELD, context)
geometry_field = self.parameterAsString(parameters, self.INPUT_GEOMETRY_FIELD, context)
geometry_type = self.parameterAsEnum(parameters, self.INPUT_GEOMETRY_TYPE, context)
geometry_crs = self.parameterAsCrs(parameters, self.INPUT_GEOMETRY_CRS, context)
df = QgsVirtualLayerDefinition()
for layerIdx, layer in enumerate(layers):
df.addSource('input{}'.format(layerIdx + 1), layer.id())
if query == '':
raise QgsProcessingException(
self.tr('Empty SQL. Please enter valid SQL expression and try again.'))
else:
localContext = self.createExpressionContext(parameters, context)
expandedQuery = QgsExpression.replaceExpressionText(query, localContext)
df.setQuery(expandedQuery)
if uid_field:
df.setUid(uid_field)
if geometry_type == 1: # no geometry
df.setGeometryWkbType(QgsWkbTypes.NoGeometry)
else:
if geometry_field:
df.setGeometryField(geometry_field)
if geometry_type > 1:
df.setGeometryWkbType(geometry_type - 1)
if geometry_crs.isValid():
df.setGeometrySrid(geometry_crs.postgisSrid())
vLayer = QgsVectorLayer(df.toString(), "temp_vlayer", "virtual")
if not vLayer.isValid():
raise QgsProcessingException(vLayer.dataProvider().error().message())
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
vLayer.fields(), vLayer.wkbType() if geometry_type != 1 else 1, vLayer.crs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
features = vLayer.getFeatures()
total = 100.0 / vLayer.featureCount() if vLayer.featureCount() else 0
for current, inFeat in enumerate(features):
if feedback.isCanceled():
break
sink.addFeature(inFeat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
示例7: test_query_with_accents
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def test_query_with_accents(self):
# shapefile with accents and latin1 encoding
df = QgsVirtualLayerDefinition()
df.addSource("vtab", os.path.join(self.testDataDir, "france_parts.shp"), "ogr", "ISO-8859-1")
df.setQuery("SELECT * FROM vtab WHERE TYPE_1 = 'Région'")
vl = QgsVectorLayer(df.toString(), "testq", "virtual")
self.assertEqual(vl.isValid(), True)
ids = [f.id() for f in vl.getFeatures()]
self.assertEqual(len(ids), 4)
# the same shapefile with a wrong encoding
df.addSource("vtab", os.path.join(self.testDataDir, "france_parts.shp"), "ogr", "UTF-8")
df.setQuery("SELECT * FROM vtab WHERE TYPE_1 = 'Région'")
vl2 = QgsVectorLayer(df.toString(), "testq", "virtual")
self.assertEqual(vl2.isValid(), True)
ids = [f.id() for f in vl2.getFeatures()]
self.assertEqual(ids, [])
示例8: test1
# 需要导入模块: from qgis.core import QgsVirtualLayerDefinition [as 别名]
# 或者: from qgis.core.QgsVirtualLayerDefinition import addSource [as 别名]
def test1(self):
d = QgsVirtualLayerDefinition()
self.assertEqual(d.toString(), "")
d.setFilePath("/file")
self.assertEqual(d.toString(), "/file")
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).filePath(), "/file")
d.setFilePath("C:\\file")
self.assertEqual(d.toString(), "C:%5Cfile")
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).filePath(), "C:\\file")
d.setQuery("SELECT * FROM mytable")
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).query(), "SELECT * FROM mytable")
q = u"SELECT * FROM tableéé /*:int*/"
d.setQuery(q)
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).query(), q)
s1 = u"file://foo&bar=okié"
d.addSource("name", s1, "provider", "utf8")
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).sourceLayers()[0].source(), s1)
n1 = u"éé ok"
d.addSource(n1, s1, "provider")
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).sourceLayers()[1].name(), n1)
d.addSource("ref1", "id0001")
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).sourceLayers()[2].reference(), "id0001")
d.setGeometryField("geom")
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).geometryField(), "geom")
d.setGeometryWkbType(QgsWKBTypes.Point)
self.assertEqual(QgsVirtualLayerDefinition.fromUrl(d.toUrl()).geometryWkbType(), QgsWKBTypes.Point)
f = QgsFields()
f.append(QgsField("a", QVariant.Int))
f.append(QgsField("f", QVariant.Double))
f.append(QgsField("s", QVariant.String))
d.setFields(f)
f2 = QgsVirtualLayerDefinition.fromUrl(d.toUrl()).fields()
self.assertEqual(f[0].name(), f2[0].name())
self.assertEqual(f[0].type(), f2[0].type())
self.assertEqual(f[1].name(), f2[1].name())
self.assertEqual(f[1].type(), f2[1].type())
self.assertEqual(f[2].name(), f2[2].name())
self.assertEqual(f[2].type(), f2[2].type())