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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!The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.Paravi原创故事《恋爱的男人们》的主人公是8个男性。《恋爱的母亲们》以女性视角展开，而《恋爱的男人们》则以男性视角展开故事。男人为什么失踪，男人为什么喜欢上了结婚的女性，男人为什么和妻子以外的女性有关系……”要注意的是，以男性为主，本篇不会描写“麻烦”的恋爱故事。The adjusted minimum wage standard in Shaanxi Province from May 1 can reach a maximum of 1680 yuan/month and a minimum of 1380 yuan/month. The part-time hourly minimum wage standard is 13.8 yuan/hour-16.8 yuan/hour. Shaanxi is classified into four categories, within this range.讲述了与从未来穿越来的型男机器人一起生活的啃老族的故事所以，陈某愿意择良主而侍之。