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正打量，头顶上忽然没了动静，好一会，那男人才道：我先起来，去街上找些活计干。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!BIM's information model can be used by managers to query, modify and call, synchronously update system information, and better maintain equipment and buildings. The operation and maintenance of buildings usually include monitoring, communication, ventilation, lighting, elevators and other systems. If the above equipment and pipelines fail, they may affect the normal operation of buildings and even cause safety accidents.2. After opening the setting interface, click the Apply Two Places at Work function option;这人不是个猛人，是个妄人。另一方面，这周徐两家暂时还真不可以轻动，他两家在越国之内还有许多势力，在没有肃清之前，先留他们一条狗命，稳定最为重要。The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.