...loyeeID)员工编码9ShipperIDInt4外键， 参照Shippers(ShipperID)运输公司编码 4.3 数据库表的设计（10） OrderItems（订单明细） 表序号列名类型长度完整性约束与规则描述1OrderIDInt4组合主键， 外键， 参照Orders(OrderID)订单编号2ProductIDInt4组合主键，...
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For example, we can have an order business item with its attributes such as orderItems and valid.
例如，我们有 order 业务项目，它有诸如 orderItems 和 valid 之类的属性。
The final mapping of interest in the Order.hbm.xml file is the mapping of the OrderItems property.
在Order.hbm.xml文件中最后一种有趣的关系就是映射OrderItems属性。
This may be a lot to take in - basically a User has many Orders, each of which is composed of several OrderItems.
这里有许多信息--用户由许多订单，每个订单有几个订单条目。
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