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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 1 post ] 
Author Message
 Post subject: Update table
PostPosted: Wed Mar 21, 2012 10:32 am 
Newbie

Joined: Fri Aug 15, 2008 9:09 am
Posts: 12
Hi All,

I am very much new to hibernate . So may be beginner level question .

I have two Pojo

1. Student
2. Course

and both are having many to many relationship.

Now I want to assign existing student to new course. For eg if User_A is already there and assigned a course of Java and now I want to assign same user with
course of Hibernate.

What I am doing is : I have create a jsp page which contains following fields
Fname
lname
drop down of course fetched from DB using hibernate

So after submitting this page I wrote following code

Code:
                openHibernaeSession();
      Criteria criteria = session.createCriteria(Student.class);
      criteria.add(Restrictions.eq("fname",student.getFname())).add(Restrictions.eq("lname",student.getLname()));
      
      if(criteria.list().size()!=0) {
         Student tempStudent = (Student) criteria.list().get(0);
         student.setId(tempStudent.getId());
         tempStudent = null;
      }
      closeHibernateSession();
      
      openHibernaeSession();
      session.update(student);
      closeHibernateSession();

               


Student.java is
Code:
package com.hibernateproject;

import java.util.ArrayList;
import java.util.Collection;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;


@Entity
public class Student {
   @Id
   @GeneratedValue
   private int id;
   private String fname;
   private String lname;
   
   @ManyToMany
   @JoinTable(
            joinColumns=@JoinColumn(name="userId"),
            inverseJoinColumns = @JoinColumn(name="courseId")
          )
            
   private Collection <Course> listOfCourse = new ArrayList<Course>();
   
   
   public int getId() {
      return id;
   }
   public void setId(int id) {
      this.id = id;
   }
   public String getFname() {
      return fname;
   }
   public void setFname(String fname) {
      this.fname = fname;
   }
   public String getLname() {
      return lname;
   }
   public void setLname(String lname) {
      this.lname = lname;
   }
   public Collection<Course> getListOfCourse() {
      return listOfCourse;
   }
   public void setListOfCourse(Collection<Course> listOfCourse) {
      this.listOfCourse = listOfCourse;
   }
   
   
   

}



course.java is
Code:
   package com.hibernateproject;

import java.util.ArrayList;
import java.util.Collection;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToMany;


@Entity
public class Course {
   @Id @GeneratedValue
   private int id;
   
   private String courseName;
   
   @ManyToMany(mappedBy="listOfCourse")
   private Collection<Student> listOfStudent = new ArrayList<Student>();
   
   
   public int getId() {
      return id;
   }
   public void setId(int id) {
      this.id = id;
   }
   public String getCourseName() {
      return courseName;
   }
   public void setCourseName(String courseName) {
      this.courseName = courseName;
   }
   public Collection<Student> getListOfStudent() {
      return listOfStudent;
   }
   public void setListOfStudent(Collection<Student> listOfStudent) {
      this.listOfStudent = listOfStudent;
   }
   

}



But it is not working . it is not updating any thing . Please guide me.


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