Hibernate一对多双向关联

                                     Hibernate一对多双向关联 

          在测试一对多双向关联时，产生了一点疑问，同inverse属性相关。

1、数据库结构

           customer表：{ customerId , customerName}

           orders表：{ orderId , orderName , idCustomer}，其中idCustomer是外键，表示customer的ID。

          （本人采用的是MS SQL SERVER 2000个人版，刚开始时新建了一个order表，结果老是报错，说' order '附近有语法错误，后来才明白order是数据库的关键字。因此，千万不要与数据库关键字重名！）

2、Customer.hbm.xml

< hibernate-mapping >
     < class  name ="com.persistent.Customer"  table ="customer" >
         < id  name ="id"  column ="customerId"  unsaved-value ="null" >
             < generator  class ="increment" ></ generator >
         </ id >
         < property  name ="name"  column ="customerName" ></ property >
         < set  name ="orders"  cascade ="all"   lazy ="false" >
             < key  column ="idCustomer" ></ key >
             < one-to-many  class ="com.persistent.Order" />
         </ set >
     </ class >
</ hibernate-mapping >

3、Order.hbm.xml

< hibernate-mapping >
     < class  name ="com.persistent.Order"  table ="orders" >
         < id  name ="id"  column ="orderId"  unsaved-value ="null" >
             < generator  class ="increment" ></ generator >
         </ id >
         < property  name ="name"  column ="orderName" ></ property >
         < many-to-one  name ="customer"  
                     column ="idCustomer"
                     class ="com.persistent.Customer"
                     lazy ="false"
                     cascade ="all" >
         </ many-to-one >
     </ class >
</ hibernate-mapping >

4、Customer.java和Order.java

public   class  Customer  ... {
private Long id;
private String name;
private Set orders = new HashSet();
...
}

public   class  Order  ... {
private Long id;
private String name;
private Customer customer;
...
}

5、结果

          在测试<set/>的inverse属性时，发现不论inverse为true还是false，单独保存customer或者order都能正确进行，好像此时inverse没起到作用一般，有点疑惑，难道映射文件有误？！

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