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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,　　也为了寻找自己的记忆而决定同行。经典功夫喜剧系列电影《龙威小子》故事未完，YouTube Red 打造续集影集《Cobra Kai》正式预告上线。34 年前在《龙威小子２》展开世纪对决的丹尼尔与强尼，时隔多年将再度交手，当时饰演两人的雷夫·马奇欧（Ralph Macchio）与威廉·萨巴卡（William Zabka）回归演出相同角色。《Cobra Kai》故事背景设定在《龙威小子３》的 30 年后，丹尼尔成为汽车经销商，有著完美的家庭。他的高中死对头强尼则是经营空手道道场 Cobra Kai,，试图在多年前的失败中找到救赎。当这两位对手再度交会，多年前的战火再度燃起。　　第二季的故事紧接着第一季，在Finch（迈克尔·爱默生 Michael Emerson 饰）被神秘的Root小姐绑架以后，“西装男”John Reese（詹姆斯·卡维泽 James Caviezel 饰）只得求助于他在纽约警局凶杀科的侦探朋友们Carter（塔拉吉·P·汉森 Taraji P. Henson 饰）以及Fusco（凯文·查普曼 Kevin Chapman 饰）的帮助，经过缜密调查，终于将Finch救出，却被Root逃脱。看似恢复如初的生活，其实暗藏危机。除了，一心想要把Finch的程序公开化的Root以外，他们还要找出HR真正的幕后黑手。另一方面，联邦调查局和中央情报局都在不遗余力地想要找出John。只要机器存在一天，这个城市仿佛从来不让他们休息........当即道：汉王，臣知道汉王所的担忧，所以在对付西楚国这件事情上不能太过依赖越国，也不能单独靠我们自己。In fact, we also need to pay attention to one thing, Because when a packet passes through a chain, All the rules of the current chain are matched, However, there must always be an order when matching. We should match one by one, and we said that rules of the same functional type will gather in a "table". Then, which rules in the "table" will be executed at the front of the "chain"? At this time, there needs to be a priority problem. We also take prerouting "chain" as an illustration.In the production environment, event handlers are called directly, and browser events are simulated in the development environment.