base.py 文件源码

def for_update_clause(self, select, **kw):
        if self.is_subquery():
            return ""

        tmp = ' FOR UPDATE'

        if select._for_update_arg.of:
            tmp += ' OF ' + ', '.join(
                self.process(elem, **kw) for elem in
                select._for_update_arg.of
            )

        if select._for_update_arg.nowait:
            tmp += " NOWAIT"

        return tmp