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The above design error stems from confusing the hierarchical structure of "role" with that of "person" and mistaking "Has-A" for "Is-A". The specific solution is to abstract a role class:Through the management of the connection pool, the sharing of database connections is realized, and the connection does not need to be recreated every time, thus saving the overhead of database recreation and improving the performance of the system!Where will you go is not as emotional as in Korean dramas. It is cold and hard. Because some traditional taboos are deliberately avoided.最近刚刚获得彭城之战的胜利，而且胜利的方式和结果都颇为震撼。三弟啊，齐国事情怎么样了？终于说到的正题，这是兄弟两人彼此都很关心的是事情，也是今日的主题。一声巨响，一条火龙从井底喷出……1976年，唐山一带出现了罕见的地质异常现象，国家地震局为了保证地震检测的准确，派有经验的周海光赶赴唐山，任唐山市地震台台长。周海光与地震局同事超凡去防空洞里勘测，使周海光意想不到的是，洞里不仅气温升高，而且成群的老鼠不停的乱窜。更为严重的是洞内不断有墙壁裂开，且喷出伴有硫磺气味的黄白色的气体，随后，一声震天巨响，周海光立即向市委、市政府作了报告。水位的升高、鱼类的死亡、老鼠的迁徙，尤其是煤矿井下出现了地热喷涌等一系列现象说明大地震即将爆发。周海光在向市政府汇报同时，向全市发出了地震临震警报。然而唐山并没有地震，而是河北大城地区发生了4.2级的地震。这次的误报，使周海光受到了极大的压力。老鼠捧茶请人客