Hibernate Example using XML in Eclipse

Example to create the Hibernate Application in Eclipse IDE

Here, we are going to create a simple example of hibernate application using eclipse IDE. For creating the first hibernate application in Eclipse IDE, we need to follow the following steps:

Create the java project
Add jar files for hibernate
Create the Persistent class
Create the mapping file for Persistent class
Create the Configuration file
Create the class that retrieves or stores the persistent object
Run the application

1) Create the java project

Create the java project by File Menu – New – project – java project . Now specify the project name e.g. firsthb then next – finish .

2) Add jar files for hibernate

To add the jar files Right click on your project – Build path – Add external archives. Now select all the jar files as shown in the image given below then click open.

Download the required jar file

example to create hibernate application in Eclipse IDE

In this example, we are connecting the application with oracle database. So you must add the ojdbc14.jar file.

download the ojdbc14.jar file

3) Create the Persistent class

Here, we are creating the same persistent class which we have created in the previous topic. To create the persistent class, Right click on src – New – Class – specify the class with package name (e.g. com.tutoraspire.mypackage) – finish .

Employee.java

  package com.tutoraspire.mypackage;  public class Employee { private int id; private String firstName,lastName;  public int getId() { return id; } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } }  

4) Create the mapping file for Persistent class

Here, we are creating the same mapping file as created in the previous topic. To create the mapping file, Right click on src – new – file – specify the file name (e.g. employee.hbm.xml) – ok. It must be outside the package.

employee.hbm.xml

  <?xml version=’1.0′ encoding=’UTF-8′?> <!DOCTYPE hibernate-mapping PUBLIC  “-//Hibernate/Hibernate Mapping DTD 5.3//EN”  “http://hibernate.sourceforge.net/hibernate-mapping-5.3.dtd”>   <hibernate-mapping>   <class name=”com.tutoraspire.mypackage.Employee” table=”emp1000″>     <id name=”id”>      <generator class=”assigned”></generator>     </id>                <property name=”firstName”></property>     <property name=”lastName”></property>              </class>             </hibernate-mapping>  

5) Create the Configuration file

The configuration file contains all the informations for the database such as connection_url, driver_class, username, password etc. The hbm2ddl.auto property is used to create the table in the database automatically. We will have in-depth learning about Dialect class in next topics. To create the configuration file, right click on src – new – file. Now specify the configuration file name e.g. hibernate.cfg.xml.

hibernate.cfg.xml

  <?xml version=’1.0′ encoding=’UTF-8′?> <!DOCTYPE hibernate-configuration PUBLIC           “-//Hibernate/Hibernate Configuration DTD 5.3//EN”           “http://hibernate.sourceforge.net/hibernate-configuration-5.3.dtd”>  <hibernate-configuration>      <session-factory>         <property name=”hbm2ddl.auto”>update</property>         <property name=”dialect”>org.hibernate.dialect.Oracle9Dialect</property>         <property name=”connection.url”>jdbc:oracle:thin:@tutoraspire.com:1521:xe</property>         <property name=”connection.username”>system</property>         <property name=”connection.password”>oracle</property>         <property name=”connection.driver_class”>oracle.jdbc.driver.OracleDriver</property>     <mapping resource=”employee.hbm.xml”/>     </session-factory>  </hibernate-configuration>  

6) Create the class that retrieves or stores the persistent object

In this class, we are simply storing the employee object to the database.

  package com.tutoraspire.mypackage;  import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.boot.Metadata; import org.hibernate.boot.MetadataSources; import org.hibernate.boot.registry.StandardServiceRegistry; import org.hibernate.boot.registry.StandardServiceRegistryBuilder;  public class StoreData {  public static void main( String[] args )     {  StandardServiceRegistry ssr = new StandardServiceRegistryBuilder().configure(“hibernate.cfg.xml”).build();         Metadata meta = new MetadataSources(ssr).getMetadataBuilder().build();  SessionFactory factory = meta.getSessionFactoryBuilder().build(); Session session = factory.openSession(); Transaction t = session.beginTransaction();   Employee e1=new Employee();       e1.setId(1);       e1.setFirstName(“Gaurav”);       e1.setLastName(“Chawla”);                  session.save(e1);    t.commit();        System.out.println(“successfully saved”);   factory.close();         session.close();        } }  

7) Run the application

Before running the application, determine that directory structure is like this.

example to create first hibernate application in eclipse IDE

To run the hibernate application, right click on the StoreData class – Run As – Java Application.

Download the hibernate example

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