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昔年这把剑结束了许多兄弟姐妹的性命，如今也让他送自己上路吧。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! This chapter explains 7 structural patterns, due to space problems, the remaining 11 behavioral patterns,南宋理宗年间，嘉兴南湖一带发生了一起仇杀，赤练仙子李莫愁因昔年曾失恋于陆展元，十年后赴来复仇，陆家幸遇武林前辈搭救，赶走李莫愁，才免受灭门之灾。一个叫杨过的少年乞丐在观看这场恶斗时，中了李莫愁暗器上的剧毒，生命垂危，被偶然过路的“天下武功第一”的西毒欧阳锋相救并收为义子。接着杨过又与正在江湖上行走的大侠郭靖、黄蓉夫妇相逢，郭靖认出他是自己的结拜兄弟杨康之子，便助他养伤复元，后又带他到隐居之处桃花岛传授武功。但郭靖夫人黄蓉却因当年杨康认贼作父、残害忠良，杨过本人又天性狡侩倔强，与自己女儿郭芙、徒弟武修文兄弟不和，不愿将杨过留在身边，以免养虎贻患……PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.The high loyalty of the program audience will be closer to the young audience in the future.