複合キーのJpaマッピング

Question

こんにちは私のテーブルとそのdescです。

Employee: 
emp_Id primary_key 
emp_Name 
emp_Address 

Address: 
emp_id -- foreign key of employee table 
addres_type 
type_id 

AddressType: 
Type_id -- foreign key of Address table 
Type 
Desc 

この関係でJPAエンティティを作成するにはどうすればよいですか。事前

Answer 1

で

おかげで、あなたはより良いIDを生成するためにAbstractPersistableを使用したい：

ので、アドレスとAddressTypeにも

1-社員

@Entity 
    @Table(name = "Employee ") 
    public class Employee extends AbstractPersistable<Long>{ 

// Employee here have a generated id from AbstractPersistable 

     private static final long serialVersionUID = 1L; 

     @Column(name = "emp_Name ") 
     private String emp_Name ; 


     @ManyToOne(optional = true) 
     @JoinColumn(name = "emp_Address") 
     private Address emp_Address; 
    } 

をPRIMARY_KEYを持っています

2アドレス

POJOで3210

@Entity 
    @Table(name = "Address") 
    public class Address extends AbstractPersistable<Long>{ 

    //Address here have a generated id from AbstractPersistable 

     private static final long serialVersionUID = 1L; 

//you can delete this column because you have already the ManyToOne in Employee 
     @ManyToOne(optional = true) 
     @JoinColumn(name = "emp_id") 
     private Employee emp_id; 
//***************** 

     @Column(name = "addres_type") 
     private String addres_type; 


     @ManyToOne(optional = true) 
     @JoinColumn(name = "Type_id") 
     private AddressType Type_id ; 
    } 

3-AddressTypeに

@Entity 
     @Table(name = "AddressType") 
     public class AddressType extends AbstractPersistable<Long>{ 

     //AddressType here have a generated id from AbstractPersistable 

      private static final long serialVersionUID = 1L; 



      @Column(name = "Type") 
      private String Type; 

      @Column(name = "Desc") 
      private String Desc; 
     }