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HomeBackend DevelopmentPHP Tutorial在update/delete等查询时使用mysql_unbuffered_query的用意是?

discuz 源码中多处update/delete的查询使用了mysql_unbuffered_query,用意是什么呢?
依手册(http://php.net/manual/en/function.mys...)描述,和mysql_query主要区别是不会一次性获取并缓存查询结果
但对update/delete查询,它和mysql_query一样返回bool值,看起来没有必要特地用mysql_unbuffered_query

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discuz 源码中多处update/delete的查询使用了mysql_unbuffered_query,用意是什么呢?
依手册(http://php.net/manual/en/function.mys...)描述,和mysql_query主要区别是不会一次性获取并缓存查询结果
但对update/delete查询,它和mysql_query一样返回bool值,看起来没有必要特地用mysql_unbuffered_query

你是对的,在update/delete中完全没有必要使用mysql_unbuffered_query函数,它们的区别仅仅在于客户端对select的处理上。

mysql_query会将你的select语句中的结果一次全部自动seek出来放到客户端内存里,而mysql_unbuffered_query则只保存一个当前的resource,你每次fetch的时候,实际上都有一次服务器通讯。这两者对update/delete的处理是相同的,因为写操作返回的只是成功状态,没有需要缓存的结果集。
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