浅析mysql、mysqli、PDO_MySQL
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浅析mysql、mysqli、PDO
PDO,MYSQL,MYSQLI 性能哪个比较好?这里我们来简单进行下对比。
普通的mysql连接肯定是会被抛弃的 因为每次都要防止sql注入的问题 而且相对来说比较慢。
mysqli是在普通mysql的基础上做的一次优化,说实话很成功,预处理方式完全解决了sql注入的问题。但是唯一的不足点 就是只支持mysql数据库。当然,如果你要是不操作其他的数据库,这无疑是最好的选择。
PDO则是最新出来的一种,连接方式兼容大部分数据库,也解决了sql注入。但是也有缺点,它只支持php5以上的版本(不过听说在未来的php6中只支持这种连接)。
PDO统一所有数据库抽象层对象接口,mysqli只统一mysql的。简单说,PDO可以实现同样的代码对不同数据库的操作,例如你从mysql迁移到mssql,程序基本不需要改动。而mysqli简单理解未mysql的封装就好。
在高负载的情况下,PDO开启长连接能够得到一个相对稳定的负载“值”。但是效率却不是最高的。 mysql最快。mysqli其次。只是mysql和mysqli在高并发、系统高负载的时候,其所承担的负载也是很可观的。PDO则不会。
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