Anjaneya Tech: HQL from clause Example

In this example you will learn how to use the HQL from clause. The from clause is the simplest possible Hibernate Query. Example of from clause is:

from Insurance insurance

Here is the full code of the from clause example:

package roseindia.tutorial.hibernate;

import org.hibernate.Session;
import org.hibernate.*;
import org.hibernate.cfg.*;

import java.util.*;

/**
* @author Deepak Kumar
*
* http://www.roseindia.net
* Select HQL Example
*/
public class SelectHQLExample {

  public static void main(String[] args) {
  Session session = null;

  try{
  // This step will read hibernate.cfg.xml
and prepare hibernate for use
  SessionFactory sessionFactory = new
Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();

//Using from Clause
  String SQL_QUERY ="from Insurance insurance";
  Query query = session.createQuery(SQL_QUERY);
  for(Iterator it=query.iterate();it.hasNext();){
Insurance insurance=(Insurance)it.next();
System.out.println("ID: " +
insurance.getLngInsuranceId());
System.out.println("First
Name: " + insurance.getInsuranceName());
}

  session.close();
}catch(Exception e){
  System.out.println(e.getMessage());
}finally{
  }

  }
}

To run the example select Run-> Run As -> Java Application from the menu bar. Following out is displayed in the Eclipse console:

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).

log4j:WARN Please initialize the log4j system properly.

Hibernate: select insurance0_.ID as col_0_0_ from insurance insurance0_

ID: 1

Hibernate: select insurance0_.ID as ID0_, insurance0_.insurance_name as insurance2_2_0_, insurance0_.invested_amount as invested3_2_0_, insurance0_.investement_date as investem4_2_0_ from insurance insurance0_ where insurance0_.ID=?

First Name: Car Insurance

ID: 2

First Name: Life Insurance

ID: 3

First Name: Life Insurance

ID: 4

First Name: Car Insurance

ID: 5

First Name: Dental Insurance

ID: 6

First Name: Life Insurance

ID: 7

First Name: Travel Insurance

ID: 8

First Name: Travel Insurance

ID: 9

First Name: Medical Insurance

ID: 10

First Name: Medical Insurance

ID: 11

First Name: Home Insurance

ID: 12

First Name: Home Insurance

ID: 13

First Name: Motorcycle Insurance

ID: 14

First Name: Motorcycle Insurance

Anjaneya Tech

Friday 24 May 2013

HQL from clause Example

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