In this section, you will learn how to delete data from database.
In this section, you will learn how to delete data from database.In this section, you will learn how to delete data from database. You follow the following steps:
Create a "JPADelete" class file./* * To change this template, choose Tools | Templates * and open the template in the editor. */ package roseindia; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.EntityTransaction; import javax.persistence.Persistence; import javax.persistence.Query; /** * * @author Administrator */ public class JPADelete { public static void main(String arg[]){ EntityManagerFactory emf=Persistence.createEntityManagerFactory("netjpa"); EntityManager em=emf.createEntityManager(); try{ EntityTransaction entr=em.getTransaction(); entr.begin(); Query query=em.createQuery("DELETE FROM Student st WHERE st.id= ?1"); query.setParameter(1, 1); int deleteRecord=query.executeUpdate(); entr.commit(); System.out.println(deleteRecord+" are deleted."); } catch(Exception ex){ System.out.println(ex.getMessage()); } finally{ em.close(); } } }Run it and get the following output.
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