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    Simple Hibernate Configuration

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    This is basic example of hibernate configuration which contain information about how interact with database using hibernate framework.

     

    Example of Hibernate Configuration

    PROJECT STRUCTURE


    Employee.java

    This is Employee object which store into database and this object is serializable.

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    package com.kodemaker.hibernate;

import java.io.Serializable;

public class Employee implements Serializable{
      
 private int employeeId;  
 private String employeeName;
 private String employeeSalary;

 public int getEmployeeId() {
  return employeeId;
 }
 public void setEmployeeId(int employeeId) {
  this.employeeId = employeeId;
 }
 public String getEmployeeName() {
  return employeeName;
 }
 public void setEmployeeName(String employeeName) {
  this.employeeName = employeeName;
 }
 public String getEmployeeSalary() {
  return employeeSalary;
 }
 public void setEmployeeSalary(String employeeSalary) {
  this.employeeSalary = employeeSalary;
 }
   
}

    Employee.hbm.xml

    This xml conatain information about how object store into database.This example show how Employee object map into table.

    increment: here primary key is employeeId which uses generator class is increment it means each time when new record insert into database primary key is incremented by 1 for new record.


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    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 package="com.kodemaker.hibernate">

<class name="Employee" table="employee" >

<id name="employeeId" column="EMPLOYEE_ID">
<generator class="increment"></generator>
</id>
 
<property name="employeeName" column="EMPLOYEE_NAME"></property> 

<property name="employeeSalary" column="EMPLOYEE_SALARY"></property> 
 
</class>


</hibernate-mapping>

    Client.java

    SessionFactory:-SessionFactory is available for particular database if we want to use another database we have to create new SessionFactory. and it is a thread safe.

    Session:-It provide physical  connection with database. and it is not thread safe.

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    package com.kodemaker.hibernate;

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

public class Client {

  private static SessionFactory sessionFactory;
   public static void main(String[] args) {
  
   sessionFactory = new  Configuration().configure().buildSessionFactory();
   Session session = sessionFactory.openSession();  
   session.beginTransaction();
   Employee employee=new Employee();
   employee.setEmployeeName("John");
   employee.setEmployeeSalary("100000");
   session.save(employee);
   session.getTransaction().commit();
   
    
 }
}

    hibernate.cfg.xml

    This is configuration file which conatain information about database property like driver class , url ,username, password.

    show_sql: It show query which is generated by hibernate.

    Dialect is specific for different database.it provide support to hibernate to how interact with database specific language.

    hbm2ddl.auto: It validate the DDL when database schema is created.

     possible value of this property is
    • validate-validate schema.
    • update-update schema.
    • create-create schema every time.
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    <?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 
 <hibernate-configuration>
 
  <session-factory>
  
   
   <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
   <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
   <property name="connection.username">root</property>
   <property name="connection.password">root</property>
   <property name="connection.pool_size">1</property>
   <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
   <property name="show_sql">true</property>
   <property name="hbm2ddl.auto">update</property>
   
   <mapping resource="com/kodemaker/hibernate/Employee.hbm.xml"/>

  </session-factory>

</hibernate-configuration>

    Database After run above application


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