Criteria Query Examples

In the last lesson we learnt how to use Criteria Query to select all the records from Insurance table. In this lesson we will learn how to restrict the results returned from the database. Different method provided by Criteria interface can be used with the help of Restrictions to restrict the records fetched from database.

Criteria Interface provides the following methods:

Method	Description
add	The Add method adds a Criterion to constrain the results to be retrieved.
addOrder	Add an Order to the result set.
createAlias	Join an association, assigning an alias to the joined entity
createCriteria	This method is used to create a new Criteria, "rooted" at the associated entity.
setFetchSize	This method is used to set a fetch size for the underlying JDBC query.
setFirstResult	This method is used to set the first result to be retrieved.
setMaxResults	This method is used to set a limit upon the number of objects to be retrieved.
uniqueResult	This method is used to instruct the Hibernate to fetch and return the unique records from database.

Class Restriction provides built-in criterion via static factory methods. Important methods of the Restriction class are:

Method	Description
Restriction.`allEq`	This is used to apply an "equals" constraint to each property in the key set of a `Map`
Restriction.`between`	This is used to apply a "between" constraint to the named property
Restriction.`eq`	This is used to apply an "equal" constraint to the named property
Restriction.`ge`	This is used to apply a "greater than or equal" constraint to the named property
Restriction.`gt`	This is used to apply a "greater than" constraint to the named property
Restriction.`idEq`	This is used to apply an "equal" constraint to the identifier property
Restriction.`ilike`	This is case-insensitive "like", similar to Postgres `ilike` operator
Restriction.`in`	This is used to apply an "in" constraint to the named property
Restriction.`isNotNull`	This is used to apply an "is not null" constraint to the named property
Restriction.`isNull`	This is used to apply an "is null" constraint to the named property
Restriction.`le`	This is used to apply a "less than or equal" constraint to the named property
Restriction.`like`	This is used to apply a "like" constraint to the named property
Restriction.`lt`	This is used to apply a "less than" constraint to the named property
Restriction.`ltProperty`	This is used to apply a "less than" constraint to two properties
Restriction.`ne`	This is used to apply a "not equal" constraint to the named property
Restriction.`neProperty`	This is used to apply a "not equal" constraint to two properties
Restriction.`not`	This returns the negation of an expression
Restriction.`or`	This returns the disjuction of two expressions

Here is an example code that shows how to use Restrictions.like method and restrict the maximum rows returned by query by setting the Criteria.setMaxResults() value to 5.


package roseindia.tutorial.hibernate;



import org.hibernate.Session;

import org.hibernate.*;

import org.hibernate.criterion.*;

import org.hibernate.cfg.*;

import java.util.*;

/**

 * @author Deepak Kumar

 * 

 * http://www.roseindia.net 

Hibernate Criteria Query Example

 *  

 */public class HibernateCriteriaQueryExample2 {

  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();

      //Criteria Query Example

      Criteria crit = 

session.createCriteria(Insurance.class);

      crit.add(Restrictions.like("

insuranceName", "%a%")); //Like condition

      crit.setMaxResults(5); //

Restricts the max rows to 5



      List insurances = crit.list();

      for(Iterator it = 

insurances.iterator();it.hasNext();){

        Insurance insurance =

 (Insurance) it.next();

        System.out.println("

ID: " + insurance.getLngInsuranceId());

        System.out.println("

Name: " + insurance.getInsuranceName());

        

      }

      session.close();

    } catch (Exception e) {

      System.out.println(e.getMessage());

    } finally {

    }    

  }

}

Current Comments

11 comments so far (post your own) View All Comments Latest 10 Comments:

I need help ....how we can union two queries using criteria.

Posted by srikanth on Saturday, 12.6.08 @ 03:53am | #82462

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Hi,

Please suggest the Hibernate examples. We will develop the code examples.

Thanks
Deepak Kumar

Posted by Deepak on Tuesday, 06.3.08 @ 21:18pm | #61983

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Hi,

The site is very good to learn Hibernate Basics.Its better to have few more examples with detailed explanation of each.

Posted by Sandeep on Tuesday, 06.3.08 @ 11:21am | #61922

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Good tutorial to learn basics of Hibernate. It can't help much to learn detailed concepts of Hibernate.

Posted by Tids on Friday, 03.28.08 @ 11:03am | #54554

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It is the best site to know clearly the programming on hibernate

Posted by saroj on Wednesday, 02.20.08 @ 13:41pm | #49192

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Hello everyone,

I'm new to hibernate-struts so i want to ask question.

How to display data using hibernate struts without using criteria?

thanks

Posted by Ehsan on Thursday, 10.4.07 @ 13:59pm | #31359

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session.close() should be in finally block

Posted by friend on Thursday, 03.8.07 @ 00:29am | #11049

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there are so many good examples of hibernate queries but there is no any example of "how to use stored procedures with hibernate".
Thanks

Posted by sweta gupta on Wednesday, 01.31.07 @ 11:16am | #4844

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Good! I appreciate the example, but should have tried to implement all possible methods as much as possible in the above example.