如何安全地参数化动态python-mysql查询？

Question

我想知道如何在python中安全地参数化动态mysql查询。动态的意思是，它的变化取决于if语句的计算方式

我了解如何在python中通过使用逗号而不是百分号来参数化mysql查询，如下所示

c.execute("SELECT * FROM foo WHERE bar = %s AND baz = %s", (param1, param2))

下面是一个“动态查询”的示例。我正在寻找一种比使用百分号更安全的方法

    def queryPhotos(self, added_from, added, added_to):
       sql = "select * from photos where 1=1 "
       if added_from is not None:
           sql = sql + "and added >= '%s' " % added_from
       if added is not None:
           sql = sql + "and added = '%s' " % added
       if added_to is not None:
           sql = sql + "and added <= '%s' " % added_to

谢谢你的洞察力

Answer 1

多亏了@Nullman，我才有了答案

    def queryPhotos(self, added_from, added, added_to):
       vars = []

       sql = "select * from photos where 1=1 "
       if added_from is not None:
          sql = sql + "and added >= %s "
          vars.append(added_from)
       if added is not None:
          sql = sql + "and added = %s "
          vars.append(added)
       if added_to is not None:
          sql = sql + "and added <= %s "
          vars.append(added_to)

       vars = tuple(vars)

       results = c.execute(sql, vars)