Last inserted id in hibernate

Getting the last inserted record id of a database table in java using hibernate

 

JavaBean

package auto;
public class User  implements java.io.Serializable {


     private int uid;
     private String uname;
    
    public User() {
    }

    public User(String uname) {
        this.uname = uname;
    }

    public User(int uid, String uname) {
        this.uid = uid;
        this.uname = uname;
      
    }

     
    public User(int uid) {
        this.uid = uid;
    }
    public User(int uid, String uname) {
       this.uid = uid;
       this.uname = uname;
    }
  
    public int getUid() {
        return this.uid;
    }
   
    public void setUid(int uid) {
        this.uid = uid;
    }
    public String getUname() {
        return this.uname;
    }
   
    public void setUname(String uname) {
        this.uname = uname;
    }

}

Mapping File

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 1 May, 2012 5:12:20 PM by Hibernate Tools 3.2.1.GA -->
<hibernate-mapping>
    <class name="auto.User" table="user" catalog="mydb">
        <id name="uid" type="int">
            <column name="uid" />
            <generator class="increment" />
        </id>
        <property name="uname" type="string">
            <column name="uname" length="20" />
        </property>
     </class>
</hibernate-mapping>

 

public class Main {

    /**
     * @param args the command line arguments
     */
     public static void main(String[] args) {
     SessionFactory sf;
     Session s;
     Transaction tx;
     Configuration  cfg=new Configuration().configure();
     sf=cfg.buildSessionFactory();
     s=sf.openSession();
     tx=s.beginTransaction();
     User u=new User("ram");
     s.save(u);
     tx.commit();
     s.flush();
     System.out.println("Last Generated Id: "+u.getUid());    
     s.close();
  
    }

}

If suppose that you have a third field in which want to insert alphanumeric value, which is generated by concatenating generated last id;

public class Main {

    /**
     * @param args the command line arguments
     */
     public static void main(String[] args) {
     SessionFactory sf;
     Session s;
     Transaction tx;
     Configuration  cfg=new Configuration().configure();
     sf=cfg.buildSessionFactory();
     s=sf.openSession();
     tx=s.beginTransaction();
     User u=new User("ram");
     s.save(u);
     tx.commit();
     s.flush();
     s.close();
     s=sf.openSession();
     tx=s.beginTransaction();
     u.setId("uoo1"+u.getUid);   
     s.update(u);
     tx.commit();
     s.flush();
     s.close();
    }

}

Note: must be add id field in bean class and  mapping for 'id' field in mapping file