Hibernate annotation way to implement compound primary key

Sometimes an entity's primary key may be multiple, such as the "Customereo" entity that was previously used, to find the specified entity by name and email, and it is considered the same entity object only if the value of name and email is exactly the same. To configure such a composite primary key, the steps are shown below.

(1) Write a composite primary key class CUSTOMERPK, the code is as follows.

Customerpk.java

import java.io.Serializable;





public class CUSTOMERPK implements Serializable {





public customerpk () {





　　　　　　　　　 }





public customerpk (string name, string email) {


this.name = name;


this.email = email;


　　　　　　　　　 }





private String Email;





public String Getemail () {


return email;


　　　　　　　　　 }





public void Setemail (String email) {


this.email = email;


　　　　　　　　　 }





private String name;





public String GetName () {


return name;


　　　　　　　　　 }





public void SetName (String name) {


this.name = name;


　　　　　　　　　 }





@Override


public int hashcode () {


final int PRIME = 31;


int result = 1;


result = PRIME * result + (email = null)? 0:email. Hashcode ());


result = PRIME * result + ((name = = null)? 0:name.hashcode ());


return result;


　　　　　　　　　 }





@Override


public boolean equals (Object obj) {


if (this = = obj)


return true;


if (obj = null)


return false;


if (getclass ()!= obj.getclass ())


return false;


final CUSTOMERPK other = (CUSTOMERPK) obj;


if (email = = NULL) {


if (other.email!= null)


return false;


} else if (!email. Equals (Other.email))


return false;


if (name = = null) {


if (other.name!= null)


return false;


} else if (!name.equals (other.name))


return false;


return true;


　　　　　　　　　 }





}