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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!在Rosewood镇宁静的外表下，隐藏着不少秘密。三年前，镇上四个最漂亮的女生——Aria（露西·海尔 Lucy Hale 饰），Spencer（特莉安·贝利索里奥 Troian Avery Bellisario 饰），Hanna（艾什莉·本森 Ashley Benso n 饰）和Emily（薛·米契尔 Shay Mitchell 饰）的朋友、学校最受欢迎的女生Alison（萨莎·皮特丝 Sasha Pieterse 饰）突然失踪，四人发誓保守秘密但关系却渐行渐远。三年之后，四人收到神秘人A发来的短信，知道她们隐藏了很久的、只有Alison才知道的秘密。以为A就是Alison，然而警察在Alison的后院里找到了她的尸体，神秘的A始终是个谜。四个女生将如何面对这一切变故？However, the three major operators have all given timetables for the commercial process of 5G networks.System Status《信义》是以恭愍王元年为时代背景的史剧，剧中李敏镐饰演的角色是一名20岁左右的王的护卫崔莹，并与穿越来到高丽时代的医生恩琇之间展开共同辅助拯救天下百姓的王成就伟业的历史剧。Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.