我们没有修改会话对象中保存瞬时信息的代码。
We did not make changes to the code that stores transient information in session objects.
Portlet一定不能因为调用了呈现链接而修改会话状态或后端状态。
The portlet must not modify session state or backend state as a result of the invocation of a render link.
之后，如果需要对表执行任何维护，您所需做的就是修改会话中全局变量的值
Then whenever you want to perform any maintenance in this table, all you have to do is modify the value of the global variable in this session
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