Hibernate Select Clause

In this lesson we will write example code to select the data from Insurance table using Hibernate Select Clause. The select clause picks up objects and properties to return in the query result set. Here is the query:

Select insurance.lngInsuranceId, insurance.insuranceName, insurance.investementAmount, insurance.investementDate from Insurance insurance

which selects all the rows (insurance.lngInsuranceId, insurance.insuranceName, insurance.investementAmount, insurance.investementDate) from Insurance table.

Hibernate generates the necessary sql query and selects all the records from Insurance table. Here is the code of our java file which shows how select HQL can be used:

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 * HQL Select Clause Example */ public class SelectClauseExample { 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(); //Create Select Clause HQL String SQL_QUERY ="Select insurance. lngInsuranceId,insurance.insuranceName," + "insurance.investementAmount,insurance. investementDate from Insurance insurance"; Query query = session.createQuery(SQL_QUERY); for(Iterator it=query.iterate();it.hasNext();){ Object[] row = (Object[]) it.next(); System.out.println("ID: " + row[0]); System.out.println("Name: " + row[1]); System.out.println("Amount: " + row[2]); } 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:

Hibernate: select insurance0_.ID as col_0_0_, insurance0_.insurance_name as col_1_0_, insurance0_.invested_amount as col_2_0_, insurance0_.investement_date as col_3_0_ from insurance insurance0_

ID: 1

Name: Car Insurance

Amount: 1000

ID: 2

Name: Life Insurance

Amount: 100

ID: 3

Name: Life Insurance

Amount: 500

ID: 4

Name: Car Insurance

Amount: 2500

ID: 5

Name: Dental Insurance

Amount: 500

ID: 6

Name: Life Insurance

Amount: 900

ID: 7

Name: Travel Insurance

Amount: 2000

ID: 8

Name: Travel Insurance

Amount: 600

ID: 9

Name: Medical Insurance

Amount: 700

ID: 10

Name: Medical Insurance

Amount: 900

ID: 11

Name: Home Insurance

Amount: 800

ID: 12

Name: Home Insurance

Amount: 750

ID: 13

Name: Motorcycle Insurance

Amount: 900

ID: 14

Name: Motorcycle Insurance

Amount: 780