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php 如何避免抽奖中的重复的兑换码

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Release： 2016-06-13 12:47:15
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php 如何处理抽奖中的重复的兑换码
做一个抽奖活动，设计表：
奖品表option:
oid   奖品ID
name  奖品名

兑换码表code:
oid  奖品ID
code  兑换码
status 是否使用 0：未使用 1：已使用

现在要求可以加入重复兑换码，而且兑换码通过文本框换行得到


编辑奖品和奖品兑换时如何处理code表的status呢，如果有相同的code,就不能直接update code set status=1 where code='{$code}'了。

Related labels：
code nbsp where
source：php.cn
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