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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,该剧将于2015年4月28日在湖南卫视金鹰独播剧场首播。可转念一想，自己现在的身份，貌似也就是个村姑吧？想到此沈悯芮不由得自嘲笑了出来。实习医生格蕾 第九季故事背景为二十世纪八十年代初的美国硅谷，其时个人电脑正处于萌芽阶段，IBM公司刚刚推出旗下第一款主打产品并垄断市场。故事主人公为乔·麦克米伦（李·佩斯 饰），一个富有远见且极具野心和胆识的IBM前高官，离开老东家后他神秘失踪一年，现任职于“卡迪夫电子公司”。乔一心想要设计出革命性科技产品，与老东家抗衡，他召集了高登·科拉克（斯科特·麦克纳里 饰）——因产品失败而一蹶不振、得不到妻子支持的天才工程师，还有卡梅伦·霍威（麦肯兹·戴维斯 饰）——曾与乔发生过一夜情的科技奇才。乔运用强硬手段，迫使现任老板不得不加入这场野心勃勃、竞争激烈的科技革命洪流。The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode: