Hibernate Tutorial

Hibernate ORM is an object-relational mapping tool for the Java programming language. It provides a framework for mapping an object-oriented domain model to a relational database.

Maven commands:

mvn archetype:generate -DgroupId=com.devyan.hibernate -DartifactId=HibernateFirstAPP -DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false

Switch to your workspace and execute below maven command to make project eclipse compatible.

mvn eclipse:eclipse -Dwtpversion=2.0

 

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.devyan.hibernate</groupId>

  <artifactId>HibernateFirstAPP</artifactId>

  <packaging>war</packaging>

  <version>1.0-SNAPSHOT</version>

  <name>HibernateFirstAPP Maven Webapp</name>

  <url>http://maven.apache.org</url>

  <dependencies>

<dependency>

   <groupId>org.hibernate</groupId>

   <artifactId>hibernate-core</artifactId>

   <version>4.3.10.Final</version>

</dependency>

<dependency>

   <groupId>com.h2database</groupId>

   <artifactId>h2</artifactId>

   <version>1.4.187</version>

</dependency>

</dependencies>

  <build>

    <finalName>HibernateFirstAPP</finalName>

  </build>

</project>

Employee.java

package com.devyan.hibernate;

public class Employee {

       int empno;

       String ename;

       String job;

       public int getEmpno() {

             return empno;

       }

       public void setEmpno(int empno) {

             this.empno = empno;

       }

       public String getEname() {

             return ename;

       }

       public void setEname(String ename) {

             this.ename = ename;

       }

       public String getJob() {

             return job;

       }

       public void setJob(String job) {

             this.job = job;

       }     

}

EMP.hbm.xml

<!DOCTYPE hibernate-mapping PUBLIC

     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

       "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping >

   <class name="com.devyan.hibernate.Employee" table="HIBERNATE.Employee">

       <id name="empno" type="int"/>

       <property name="ename"/>

       <property name="job"/>

   </class>

</hibernate-mapping>

NOTE: HIBERNATE.Employee where HIBERNATE is my schema name and Empoyee is table name

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?> 

<!DOCTYPE hibernate-configuration PUBLIC 

          "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 

          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.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:@localhost: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="EMP.hbm.xml"/> 

    </session-factory> 

 

</hibernate-configuration> 

NOTE:

i.)         ADD ojdbc5.jar in your project

Database Setup

Create a table Employee in your Oracle database

CREATE TABLE employee

( empno number(10) NOT NULL,

  ename varchar2(50) NOT NULL,

  job varchar2(50)

);

StoreEmployeeData.java

package com.devyan.hibernate;

import org.hibernate.Session; 

import org.hibernate.SessionFactory; 

import org.hibernate.Transaction; 

import org.hibernate.cfg.Configuration; 

 

public class StoreEmployeeData { 

public static void main(String[] args) { 

     

    //creating configuration object 

    Configuration cfg=new Configuration(); 

    cfg.configure("hibernate.cfg.xml");//populates the data of the configuration file 

     

    //creating seession factory object 

    SessionFactory factory=cfg.buildSessionFactory(); 

     

    //creating session object 

    Session session=factory.openSession(); 

     

    //creating transaction object 

    Transaction t=session.beginTransaction(); 

         

    Employee e1=new Employee(); 

    e1.setEmpno(1323415); 

    e1.setEname("NEwton"); 

    e1.setJob("Analyst"); 

     

    session.persist(e1);//persisting the object 

     

    t.commit();//transaction is commited 

    session.close(); 

     

    System.out.println("successfully saved"); 

     

} 

} 

Run your java application:

Console message:

INFO: HHH000232: Schema update complete

successfully saved

 Hibernate CRUD