调试一下,看看connection的状态是什么,不可用了还是什么

解决方案 »

  1.   

    重复使用静态的 SqlConnection 对象是个错误,正确的做法是每次查询都新建一个连接,打开,并且确保关闭(用 finally ),
    许多人担心效率问题,其实不必考虑太多,配置连接池就好了。
      

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