Couldn't perform the operation prepareCall

[code="sql"]--- Cause: java.sql.SQLException: Couldn't perform the operation prepareCall: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see logs).

今天又遇到了这个问题

Couldn't perform the operation rollback: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see logs).

引用

如果使用了连接池，这说明已经成功连接了数据库，但是for some reason自动关闭了。
在proxool.xml文件增加一个属性maximum-active-time设置最大活动时间一个小时3600000

<maximum-active-time>3600000</maximum-active-time>


这是基于较大数据量的查询时，花费查询时间比较长，导致proxool设置的超时时间将session关闭，后续在使用库的时候提示报错。

更改了后不报错了，呵呵。