休眠主外键字段

Question

I have 2 simple tables in database. They look like:

T1                                      T2
ID    NUMBER     Primary key            ID    NUMBER    Primary key & Foreign key from T1
Value VARCHAR                           Value VARCHAR

How does hibernate entity for T2 look like? I tried to do it with @Embeddable class containing T1 mapped-class object but this doesn't work. Thanks.

UPD: the full use case when I need such a structure is below: I have business entities tables, containing some data for specific business users, and Company table with Id and value fields too, and I want to create CompanyToBEntity table, containing data about what company can access what object.(objects are any row of bus.entities).

So I think this structure fits this case.

pic describing it better:

Answer 1

You can try Unidirectional one-to-one association vi primary key association something like -

T1 Mapping

@Id  
@Column(name="ID")  
private Integer ID; 

T2 Mapping

@OneToOne(cascade=CascadeType.ALL)  
@PrimaryKeyJoinColumn  
private T1 t1;

For more reference you visit here , the example is based on hbm.xml