sql.py 文件源码

def as_string(self, context):
        # is it a connection or cursor?
        if isinstance(context, ext.connection):
            conn = context
        elif isinstance(context, ext.cursor):
            conn = context.connection
        else:
            raise TypeError("context must be a connection or a cursor")

        a = ext.adapt(self._wrapped)
        if hasattr(a, 'prepare'):
            a.prepare(conn)

        rv = a.getquoted()
        if sys.version_info[0] >= 3 and isinstance(rv, bytes):
            rv = rv.decode(ext.encodings[conn.encoding])

        return rv