（中）java普通业务完整操作，从实体类的创建，到连接数据库，再到dao、service层；java类连接数据库完整操作
Synopsis
基本步骤1 .实体类users 最基本的只有有了实体类你才可以对数据库的某项进行操作； 2.数据库连接帮助类DbHelper 3.数据库操作 ...
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