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Hibernate Criteria Expression (or)
Posted on: February 27, 2008 at 12:00 AM

In this section, you will learn to use the "or" method. This is one of the most important method that returns the disjunction of the two expressions.

Hibernate Criteria Expression (or)

In this section, you will learn to use the "or" method. This is one of the most important method that returns the disjunction of the two expressions. You can also build the nested expressions using 'and' and 'or'.
Expressions: The Hibernate Criteria API supports a rich set of comparison operators. Some standard SQL operators are =, <, ?, >, ?.

Expression or(Criterion LHS, Criterion RHS): This method returns the disjuction of two expressions. Any given condition is 'true' then it executes the query. In this tutorial, "or" is used :

Expression.or(Expression.eq("lngInsuranceId", new Long(3), Expression.eq("IngInsuranceId", new Long(6))).

Table Name: insurance

ID	insurance_name	invested_amount	investement_date
2	Life Insurance	25000	0000-00-00 00:00:00
1	Givan Dhara	20000	2007-07-30 17:29:05
3	Life Insurance	500	2005-10-15 00:00:00
4	Car Insurance	2500	2005-01-01 00:00:00
5	Dental Insurance	500	2004-01-01 00:00:00
6	Life Insurance	900	2003-01-01 00:00:00
7	Travel Insurance	2000	2005-02-02 00:00:00

Here is the code of the class using "or" Expression :


package roseindia.tutorial.hibernate;



import java.util.Iterator;

import java.util.List;



import org.hibernate.Criteria;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

import org.hibernate.criterion.Expression;



public class HibernateCriteriaQueryExpressionOr {



  /**

 * @param args

 */

  public static void main(String[] args) {

  // TODO Auto-generated method stub



  Session sess = null;

  try {

  SessionFactory fact = new 

Configuration().configure().buildSessionFactory();

  sess = fact.openSession();

  Criteria crit = sess.

createCriteria(Insurance.class);

  crit.add(Expression.or

(Expression.eq("lngInsuranceId",new Long(3)),

 Expression.eq("lngInsuranceId",new Long(6))));

List list = crit.list();

 for (Iterator it = list.iterator();it.hasNext();){

Insurance ins = (Insurance)it.next();

 System.out.println("Insurance 

Id:
" + ins.getLngInsuranceId());

System.out.println("Insurance 

Name: "  + ins.getInsuranceName());

System.out.println("Invested 

Amount: " + ins.getInvestementAmount());

System.out.println("Investement 

Date:" + ins.getInvestementDate());

  }

  sess.close();

  }

  catch(Exception e){

  System.out.println(e.getMessage());

  }

  }

}

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Output:

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

log4j:WARN Please initialize the log4j system properly.

Hibernate: select this_.ID as ID0_0_, this_.insurance_name as insurance2_0_0_, this_.invested_amount as invested3_0_0_, this_.investement_date as investem4_0_0_ from insurance this_ where (this_.ID=? or this_.ID=?)

Insurance Id: 3

Insurance Name: Life Insurance

Invested Amount: 500

Investement Date:2005-10-15 00:00:00.0

Insurance Id: 6

Insurance Name: Life Insurance

Invested Amount: 900

Investement Date:2003-01-01 00:00:00.0

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