functions.py 文件源码

def as_sqlite(self, compiler, connection):
        func_name = connection.ops.spatial_function_name(self.name)
        if func_name == 'ST_Translate' and len(self.source_expressions) < 4:
            # Always provide the z parameter for ST_Translate (Spatialite >= 3.1)
            self.source_expressions.append(Value(0))
        elif func_name == 'ShiftCoords' and len(self.source_expressions) > 3:
            raise ValueError("This version of Spatialite doesn't support 3D")
        return super(Translate, self).as_sqlite(compiler, connection)