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JPA update data Example

                         

In this section, you know how to update the database data through the jpa. You follow the following steps for updating the data. To update the data into database you can follow the following steps:

  • Load the business object
  • Update the data
  • Save (persist) the data using JPA merge() method

Follow the following steps to develop the example code to update the data into database.

  1. Create a "JPAUpdate.java" file.

  2. Put the following text.

  3. Update code:
    /**

    */
    package roseindia;

    import javax.persistence.EntityManager;
    import javax.persistence.EntityManagerFactory;
    import javax.persistence.Persistence;

    /**
    * @author Administrator
    *
    */
    public class JPAUpdate {

    /**
    * @param args
    */
    public static void main(String[] args) {
    // TODO Auto-generated method stub

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("jpa");
    EntityManager em = emf.createEntityManager();
    try{
    em.getTransaction().begin();
    //find 
    Student stud1 = em.find(Student.class,1);
    stud1.setSname("Deepak");
    //update
    em.merge(stud1);
    em.getTransaction().commit();
    }
    catch(Exception e){
    System.out.println(e.getMessage());
    }
    finally{
    em.close();
    }
    }

    }
  4. Run it and get the output in "Console window" of eclipse.

  5. Check it in MySQL.

                         

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