【原创】MySQL 在读取异常错误缓冲区方面的提升(MySQL5.6)
先来解释下什么是错误缓冲区?在MySQL里面,错误缓冲区只记录最近一次出现的错误,只要是有新的错误产生,旧的就会被覆盖掉。所以想知道产生了什么错误,就得在
先来解释下什么是错误缓冲区?
在MySQL里面, 错误缓冲区只记录最近一次出现的错误, 只要是有新的错误产生,旧的就会被覆盖掉。 所以想知道产生了什么错误,
就得在每个有可能发生错误的语句后面紧跟着"show warnings" 或者 "show errors"。 最简单的方法是把输出的结果重定向到自己定义的
日志文件里面,这样就可以方便后续查看。当然如果想随时查看这些错误,我们就得通过MySQL提供的API来实现。
自从MySQL 5.6 这个革命性的版本出现后,问题得到了初步解决。虽然离我们想的还差好多。
MySQL 5.6 提供了 get diagnostic 语句来获取错误缓冲区的内容,然后把这些内容输出到不同范围域的变量里,以便我们后续灵活操作。
下来,我们就来看一个例子。
针对的表结构为:
存储过程代码为:
我们来执行上面的存储过程,服务器空间,完了后,网站空间,就能把错误信息保存到SESSION 变量@i_result 中。这样,香港空间,方便了后期进行各种输出。
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