Hibernate delete Query

In this tutorial you will learn how to use HQL delete query in Hibernate.


 

Ads

Tutorials   
How to write hello world example program in Hibernate? How to create one to one relationship in Hibernate 4 with Annotation? How to calculate minimum in Hibernate using the min() Function Hibernate 4.3.4 Released: Hibernate 4.3.4.Final Maven dependency Hibernate 4.3 Hello World: Example How to create SessionFactory in Hibernate 4.3.1? Hibernate 4 Hello World: Example of Hello World program Hibernate 4 create Session Factory: Example of creating Session Factory in Hibernate 4 Hibernate 4.3 and JPA 2.1 Example What is Hibernate in Java? Hibernate Overview and Architecture What is JPA 2.1? Hibernate 4.3.0.Final Maven dependency Hibernate 4.3 ORM Features Hibernate 4.3 Tutorial Hibernate Criteria average example Hibernate Criteria load all objects from table Hibernate Criteria Hibernate beginner tutorial Hibernate Session.delete() Example Hibernate save or update method example Hibernate Load Example Hibernate save Example - Rose India Hibernate 4 tutorials Hibernate Example Step by Step in Eclipse Hibernate Configuration files Setup Hibernate Environment Hibernate Architecture Hibernate Overview Hibernate 4.2 Tutorial Hibernate 4 Annotations Tutorial Hibernate 4 AnnotationSessionFactoryBean hibernate versions hibernate jndi hibernate tomcat hibernate metamodel generator hibernate entity Seam Hibernate C3P0 Hibernate hibernate shard hibernate means temporal hibernate jsf hibernate spring j2ee hibernate spring hibernate encrypted password alias_to_entity_map hibernate temporal jsf spring hibernate hibernate by example hibernate repository hibernate sample code
Ads

Hibernate delete Query

In this tutorial you will learn how to use HQL delete query in Hibernate.

In this section we are discussing about the HQL delete query of Hibernate. Here we will give an example which will demonstrate you how to use HQL delete query. An example is being given regarding how delete query may be used in programs. At first we must know about the delete query, delete query is used to delete the fields, field records, table, etc. In our example we will delete the field's record. To do so at first I have created a table named salesorder with 'id', 'price', and 'purchaser' fields that contains some records. Then created a POJO class named SalesOrder, a mapping file named salesorder.hbm.xml file which will map the class object with table, a configuration file hibernate.cfg.xml file that the hibernate utilizes for creating a pool connection and the required environment setup to work with database. Finally created a class where we will obtain the configuration, create a SessionFactory and obtain a session using SessionFactory, create a Transaction within which we will try to delete the existing data using delete query and updates using executeUpdate() method of Query. The value for deleting will be given by the user at run time.

Complete Code :

Example :

SalesOrder.java

package roseindia;

public class SalesOrder {
private int id;
private int price;
private String purchaser;

public SalesOrder()
{

}
public SalesOrder(int price, String purchaser)
{
this.price = price;
this.purchaser = purchaser;
}

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public String getPurchaser() {
return purchaser;
}
public void setPurchaser(String purchaser) {
this.purchaser = purchaser;
}
}

salesorder.hbm.xml

<?xml version='1.0'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="roseindia">
<class name="SalesOrder" table="salesorder">
<id name="id" type="int" column="id" >
</id>
<property name="price">
<column name="price" />
</property>
<property name="purchaser">
<column name="purchaser" />
</property>
</class>
</hibernate-mapping>

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://192.168.10.13:3306/data
</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.current_session_context_class">thread</property>
</session-factory>

</hibernate-configuration>

HibernateDeleteQuery.java

package roseindia;

import java.util.Scanner;

import org.hibernate.Transaction;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class HibernateDeleteQuery {
private static SessionFactory sessionFactory;
private static ServiceRegistry serviceRegistry;

public static void main(String args[])
{
Session session = null;
try
{
try
{
Configuration cfg = new Configuration();
cfg.addResource("roseindia/salesorder.hbm.xml");
cfg.configure();
serviceRegistry = new ServiceRegistryBuilder().applySettings(
cfg.getProperties()).buildServiceRegistry();
sessionFactory = cfg.buildSessionFactory(serviceRegistry);
}
catch(Throwable th)
{
System.err.println("Failed to create sessionFactory object."
+ th);
throw new ExceptionInInitializerError(th);
}
session = sessionFactory.openSession();
Scanner scan = new Scanner(System.in);
Transaction t = session.beginTransaction();
System.out.println("Enter purchaser id to delete : ");
int id = scan.nextInt();
Query query = session.createQuery("delete SalesOrder so where so.id= '"+id+"'");
int update = query.executeUpdate();
if(update == 0 || update == 1)
{
System.out.println(update + " row affected");
}
else
System.out.println(update + " rows affected");

System.out.println("Records Deleted Successfully");
System.out.println("Successfully updated");
t.commit();
}
catch(Exception e) 
{
System.out.println(e.getMessage());
}
finally
{
session.close();
}
}
}

Output :

1. salesorder table before deleting the record

2. When you will execute the java file HibernateDeleteQuery.java (RightClick -> Run As -> Java Application) you will get the output as :

3. salesorder table after deleting the record

Download Source Code

Advertisements

Share on Google+Share on Google+

Hibernate delete Query

Posted on: March 1, 2012 If you enjoyed this post then why not add us on Google+? Add us to your Circles

Advertisements

 

Discuss: Hibernate delete Query  

Post your Comment


Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image
 
 
Comments:0

Ads

 

Ads