Question

How do I join two tables in hibernate and Spring. below is my suto java code and I need to do a join on objectA where the name field is equal to the name field in objectB but I am going to be searching on ObjectA ID field but I need returned. ObjectA ID, ObjectA Name, ObjectA Regin, ObjectB Address.

//
// CLASS OBJECT A
//
@Entity
@Table(name = "tableA")
public class ObjectA {

    @Id
    @Column(name = "id")
    private String id; 

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

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

}

//
// CLASS OBJECT B
//
@Entity
@Table(name = "tableB")
public class ObjectB {

    @Id
    @Column(name = "id")
    private String id; 

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

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

}

can someone please tell me how to do this within the java code.

Answer 1

Add this to your A class:

@OneToOne
@JoinColumn(name="name")
private ObjectB objectB;

So that when you retrieve for A, you’ll get inside corresponding B by name.