load_gml_as_xml.py 文件源码

def _create_layer(self, type, srid, attributes, title):
        """
        Creates an empty spatialite layer
        :param type: 'Point', 'LineString', 'Polygon', etc.
        :param srid: CRS ID of the layer
        :param attributes: list of (attribute_name, attribute_type, attribute_typename)
        :param title: title of the layer
        """
        driver = ogr.GetDriverByName('GPKG')
        ds = driver.CreateDataSource(self.output_local_file)
        layer = ds.CreateLayer("meta", geom_type = ogr.wkbNone)
        layer.CreateField(ogr.FieldDefn('key', ogr.OFTString))
        layer.CreateField(ogr.FieldDefn('value', ogr.OFTString))

        if srid:
            wkbType = { 'point': ogr.wkbPoint,
                        'multipoint': ogr.wkbMultiPoint,
                        'linestring': ogr.wkbLineString,
                        'multilinestring': ogr.wkbMultiLineString,
                        'polygon': ogr.wkbPolygon,
                        'multipolygon': ogr.wkbMultiPolygon
            }[type]
            srs = osr.SpatialReference()
            srs.ImportFromEPSGA(int(srid))
        else:
            wkbType = ogr.wkbNone
            srs = None
        layer = ds.CreateLayer("data", srs, wkbType, ['FID=id'])
        layer.CreateField(ogr.FieldDefn('id', ogr.OFTInteger64))
        layer.CreateField(ogr.FieldDefn('fid', ogr.OFTString))
        layer.CreateField(ogr.FieldDefn('_xml_', ogr.OFTString))

        att_type_map = {QVariant.String : ogr.OFTString,
                        QVariant.Int : ogr.OFTInteger,
                        QVariant.Double: ogr.OFTReal,
                        QVariant.DateTime: ogr.OFTDateTime}
        for aname, atype in attributes:
            layer.CreateField(ogr.FieldDefn(aname, att_type_map[atype]))

        # update fields
        layer.ResetReading()

        qgs_layer = QgsVectorLayer("{}|layername=data".format(self.output_local_file), title, "ogr")
        return qgs_layer