·2,447,543篇论文数据，部分数据来源于NoteExpress
此类负责管理数据库连接，包括建立初始连接和创建演示应用程序要访问的 ProductDAO 实例。
This class is responsible for managing the database connection, which includes establishing the initial connection and creating a ProductDAO instance for the demo application to access.
youdao
应用推荐
模块上移
模块下移
不移动