用PQexec执行SQL语句，一定要用PGresult指针将结果记录下来，并用PQclear 释放，否则内存泄露非常严重。
PQclear 释放于PGresult相关联的存储空间． 任何不再需要的查询结果在不需要的时候都应该用 PQclear释放掉．
void PQclear(PQresult *res);
你可以保留PGresult对象任意长的时间； 当你提交新的查询时它并不消失， 甚至你断开联接后也是这样．要删除它，你必须调用 PQclear．不这么做将导致前端的存储器泄漏．
另外，程序中lsb_geteventrec()得到的eventRec结构一直重用同一处内存，但是由于日志文件中事件结构的大小不同，程序在执行中内存可能会稍微增加一些，目前看属于正常情况。
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