Hibernate Annotations 中的复合键混乱
我有两张表，分别为“A”和“B”。第三个表“C”具有直接引用“A”和“B”的两列，即“C”包含分别引用A的id和B的id的“A_id”和“B_id”。 “A_id”和“B_id”上定义了唯一的键。但“C”中没有 id 列。如何在不更改“C”架构的情况下定义“C”的模型类。我对使用 Hibernate 注释非常陌生，所以请帮助我。 “A”和“B”还有其他列，并且已经定义了它们的模型类。
I have two tables say 'A' and 'B'. A third table 'C' has two columns that directly refer to 'A' and 'B' i.e. 'C' contains 'A_id' and 'B_id' that refer to A's id and B's id respectively. There is unique key defined on 'A_id' and 'B_id'. But there is no id column in 'C'. How can I go about defining the model class for 'C' without altering the schema for 'C'. I am very new to using Hibernate annotations so please help me out. 'A' and 'B' have other columns as well and have their model classes already defined.
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在我看来，C 只是一个连接表。无需显式映射 C。您可以使用 @JoinTable 注释将关系从 A 映射到 B，反之亦然。请查看一对多联接表设置中的示例。 EMP_PHONE 没有映射，它只是电话和员工之间的连接表。
It looks to me like C is just a join table. There is no need to map C explicitly. You can map relation from A to B or vice versa using @JoinTable annotation. Please take a look at the example at One To Many Join Table Setup. There is no mapping for EMP_PHONE, it is just a join table between phone and employee.