Hibernate Query Language- From Clause

Hibernate Query Language (HQL)

AIM:

            We use from clause in hibernate to select records from database

Syntax

From Employee employee;

Procedure:

Step 1:

            Create Hibernate Reverse Engineering wizard

Step 2:

            Create HibernateUtil.java

Step 3:

            Create POJO class and mapping files

Step 4:

            Create jsp file named as FromClause

           Include following coding into FromClause

< %@page import="org.hibernate.SessionFactory,org.hibernate.Session" % >
< %@page import="org.hibernate.cfg.Configuration,org.hibernate.*" % >
< %@page import="Hiber.Employee" % >
< %@page import="java.util.*" % >
< %@page contentType="text/html" pageEncoding="UTF-8"% >
< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
http://www.w3.org/TR/html4/loose.dtd >

< html >
< head >
< title > JSP Page < /title >
< /head >
< body >
< %
try
{
SessionFactory sessionFactory=new Configuration().configure().buildSessionFactory();
Session s=sessionFactory.openSession();

String sql="from Employee employee";

Query query=s.createQuery(sql);
Iterator it=query.iterate();
% >
< table border="5" >
< caption > < b > Example For Hibernate- From Clause < /b > < /caption >
< tr > < th > EmployeeName < /th > < th > EmployeeID < /th > < /tr >
< %
while(it.hasNext())
{
Employee e=(Employee)it.next();
% >
< tr >
< td > < %= e.getEmpname() % > < /td >
< td > < %= e.getEmpno() % > < /td >
< /tr >

< %
}
% >
< /table >
< %
}
catch(Exception e)
{
out.println(e);
}
% >
< /body >
< /html >

Step 5:

               Run the FromClause.

               Right click on FromClause.jsp and select Run

Step 6:

Structure Of the Hibernate-From Clause