mysql一个时区引发的问题_MySQL
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mysql一个时区引发的问题 近期有客户反馈了一个问题，在使用ERP 2BizBox的过程中，发现如下问题： 在查看财务模块的报表损益表的时候，修改时间参数，损益报表的数据没有改变。
经过多方查证，最终发现2BizBox 本身的查询并没有问题，而是由于客户修改了系统的默认时区导致的。 具体是什么问题，请听我细细道来： 2BizBox在处理损益表的查询的时候，由于涉及到了多个表的查询，应该算是一个比较重的查询，所以会首先从多个表里面把数据查询下来，并缓存在一个临时表里面；这样下次在查询的时候，会有一个查询时间间隔的判断，如果本次的查询时间比上一次查询的时间大的数值间隔小于3秒，就会从临时表里面直接取出数据，这样处理是为了防止同一个用户同时多次查询，给系统造成负担。上一次的查询时间保存在数据库的，本次查询时间就是系统的当前时间，这样在正常的系统是可以稳定的执行的。那么如果服务器操作系统与数据的时区设置不一致的时候，就会有可能导致本次查询的时间反而小于上次查询时间，应此就会从临时表里面去取数据，而不会更新临时表的数据。 比如数据库的时区是CST（UTC -6 hours），操作系统时区：CDT（UTC -5 hours），这样就会导致系统的时间数据库的时间一个小时。这样如果在一次查询之后，在改变查询参数的时候，如果相隔的时间在一个小时之类，都不会更新数据，所以就出现了改变查询参数而报表数据不变的情况。 解决的方法当然就很简单：把mysql的时区和系统时区调整成一致。 作者 netcy bitsCN.com
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