Broken pipe in QSqlQuery

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#include <signal.h>
signal(SIGPIPE, SIG_IGN);
//.

And reconnect mysql database before wait_timeout reached.

refer to:
https://zhuanlan.zhihu.com/p/335138654
https://blog.csdn.net/chengcheng1024/article/details/108104507
https://zhuanlan.zhihu.com/p/36104903