1.包装数据库链接获取过程 2.在不用到重量级的持久化层和重量级连接池的情况下, 可以简化代码, 方便维护 -1. Packaging database link access to the course 2. Do not have to heavyweight and heavyweight durable layer connection pooling, the code can be simplified to

ConnectionThread extends Thread Source Code for Andriod.