目录1、原理2、怎么理解“异常走的是数据库错误路径，开销比普通逻辑分支稍高”？1. 普通逻辑分支 vs 异常机制2. 数据库层面3. 结合起来的理解在 MyBATis + mysql 项目里，完全可以通过 try-catch 捕获数据
so in my php I have something like this $_SESSION[\'opened\'] = true; But It will no开发者_StackOverflowt be set to true until user will perform some actions with some other html\\php pages
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