geoalchemy_common.py 文件源码

def setup_spatial_table(package_extent_class, db_srid=None):

    if legacy_geoalchemy:

        package_extent_table = Table(
            'package_extent', meta.metadata,
            Column('package_id', types.UnicodeText, primary_key=True),
            GeometryExtensionColumn('the_geom', Geometry(2, srid=db_srid))
        )

        meta.mapper(
            package_extent_class,
            package_extent_table,
            properties={'the_geom':
                        GeometryColumn(package_extent_table.c.the_geom,
                                       comparator=PGComparator)}
        )

        GeometryDDL(package_extent_table)
    else:

        # PostGIS 1.5 requires management=True when defining the Geometry
        # field
        management = (postgis_version()[:1] == '1')

        package_extent_table = Table(
            'package_extent', meta.metadata,
            Column('package_id', types.UnicodeText, primary_key=True),
            Column('the_geom', Geometry('GEOMETRY', srid=db_srid,
                                        management=management)),
        )

        meta.mapper(package_extent_class, package_extent_table)

    return package_extent_table