Working with DB2 XML data requires establishing a connection to the database that contains your data.
处理 DB2 XML 数据需要建立到包含数据的数据库的连接。
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.
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。
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