2.Hibernate Example – Step by Step

Hibernate Example – Step by Step
We need
Table: student
Id         |name |address            |
1              |satya   |HYD                     |
2              |Jon       |VZG                     |

1. Simple POJO class (StudentBo)
2. Main Class (StudentDAo)
3. Mapping file (student.hbm.xml)
4. Configuration file (hibernate.cfg.xml)

1.       Simple POJO class (StudentBo)
·         It contains contains table column names as data members
·         In above table id,name,addrees are columns
·         It contains column names with setters and getters
package bo;

public class StudentBo {
   private int id;
   private String nameaddress;
   public int getId() {
          return id;
   public void setId(int id) {
          this.id = id;
   public String getAddress() {
          return address;
   public void setAddress(String address) {
          this.address = address;
   public String getName() {
          return name;
   public void setName(String name) {
          this.name = name;


2.       Main Class (StudentDAo)
·         Configuration à it will loads the all the configurations from config file and save in config object
·         Session Factory à It will connect to the database
·         Session                 à it opens the session for DB operations
·         Transaction         à to save the Changes in DB
package dao;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import bo.StudentBo;

public class StudentDao {
public static void main(String[] args) {
   System.out.println("**************** HIBERNATE ****************************");
   Configuration cfg = new Configuration();
   SessionFactory factory = cfg.buildSessionFactory();
   Session session = factory.openSession();
   Transaction transaction = session.beginTransaction();
   StudentBo bo = new StudentBo();

3.       Mapping file (student.hbm.xml)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

<hibernate-mapping package="bo">
   <class name="StudentBo" table="student">
          <id name="id" column="id">
                 <generator class="assigned" />
          <property name="name" column="name" index="1" type="java.lang.String" />
          <property name="address" column="address" index="2"    type="java.lang.String" />

4.       Configuration file (hibernate.cfg.xml)
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>        
        <property name="connection.pool_size">1</property>
        <!-- Hibernate Properteies -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="show_sql">true</property>
          <property name="hbm2ddl.auto">validate</property>  

        <mapping resource="res/student.hbm.xml"/>

·         Create - drop+create
·         Update - alter+create
·         Validate - check schema
·         create-drop - drop+create+drop

·         dialect
·         mapping
·         show_sql
·         format_sql


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