清单4中的代码展示了从PurchaseOrder对象的实例化和设置一直到此对象在数据库中的持久化这个完整的过程。
The code in Listing 4 illustrates the journey from PurchaseOrder object instantiation and setup all the way through to persistence of this object in the database.
说明：VB水费收费管理信息系统，完整的毕业论文设计资料，含VB代码实例，系统功能：用户信息的添加、修改、删除和查询。
VB water charges management information system, complete thesis design information, including the VB code example, the system features: User information to add, modify, delete, and query.
实例目录包含一个完整的主题，制作出一个源代码。
The example-theme directory contains a complete them that builds out-of-source.
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