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İlk başta hibarnate nedir onu yazıyorum

Java için geliştirilmiş olan (NHibernate adında bir de .NET versiyonu vardır) nesne/ilişki eşleme işini yapan, ücretsiz, özgür (LGPL lisansına sahip) bir yazılımdır. Nesne tabanlı alan modelini geleneksel ilişkisel veritabanına çevirmeye yaramaktadır.
Hibernate verilerin saklanması, güncellenmesi, silinmesi, vb. işleri nesne tabanlı modele göre kolaylaştırmak için kullanılmaktadır. Kalıcı sınıfları oluşturup (basit veri sınıfları) bu sınıfları XML kullanılarak eşlenmiş veritabanı tablolarına ve sahalarına kaydetmek için kullanılır.


Kod:
<?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=”hibernate.dialect”>org.hibernate.dialect.DerbyDialect</property>
<property name=”hibernate.connection.driver_class”>org.apache.derby.jdbc.ClientDriver</property>
<property name=”hibernate.connection.url”>jdbc:derby://localhost:1527/sample</property>
<property name=”hibernate.connection.username”>app</property>
<property name=”hibernate.connection.password”>app</property>
<property name=”current_session_context_class”>thread</property>
<mapping/>
</session-factory>
</hibernate-configuration>
Create a Customer.java file
package com.tunatore.hibernateexample;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
/**
*
* @author tuna-mert tore
*/
@Entity
@Table(name = “CUSTOMER”) //reference for the table inside Database
public class Customer implements Serializable{
@Id //Colum CUSTOMER_ID inside database will be mapped to customer_ID
@Column(name = “CUSTOMER_ID”)
private int customer_ID;
//Colum NAME inside database will be mapped to customer_ID
@Column(name = “NAME”) 
private String name;
//Colum CITY inside database will be mapped to city
@Column(name = “CITY”)
private String city;
//Colum STATE inside database will be mapped to state
@Column(name = “STATE”)
private String state;
/**
* @return the customer_ID
*/
public int getCustomer_ID() {
return customer_ID;
}
/**
* @param customer_ID the customer_ID to set
*/
public **** setCustomer_ID(int customer_ID) {
this.customer_ID = customer_ID;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public **** setName(String name) {
this.name = name;
}
/**
* @return the city
*/
public String getCity() {
return city;
}
/**
* @param city the city to set
*/
public **** setCity(String city) {
this.city = city;
}
/**
* @return the state
*/
public String getState() {
return state;
}
/**
* @param state the state to set
*/
public **** setState(String state) {
this.state = state;
}
}
 
Create a HibernateManager.java file for getting SessionFactory object from Hibernate ORM.
package com.tunatore.hibernateexample;
import org.hibernate.*;
import org.hibernate.cfg.*;
public class HibernateManager // Hibernate utility class
{
private static final SessionFactory sessionFactory;
static { //create sessionFactory only once 
try {
// creating the SessionFactory from hibernate.cfg.xml 
sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
} catch (Throwable ex) {
System.err.println(“SessionFactory initial creation error.”+ ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
Create a business operations class HibernateExample.java
package com.tunatore.hibernateexample;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;
/**
*
* @author tuna-mert tore
*/
public class HibernateExample {
public static Customer[] getCustomersInState(String stateName) {
//create SessionFactory object for opening Session
SessionFactory sessionFactory = HibernateManager.getSessionFactory();
Session session = sessionFactory.getCurrentSession();
//Criteria requires a transaction opened
session.beginTransaction();
//create Criteria for Customer class
Criteria criteria = session.createCriteria(Customer.class);
//add a Restriction which will be used for equality –> state = ‘MI’
criteria.add(Restrictions.eq(“state”, stateName));
//add an order for using customer_ID column
criteria.addOrder(Order.asc(“customer_ID”));
//return the resultset as a List
List<Customer> customers = criteria.list();
//convert List to Array
return customers.toArray(new Customer[customers.size()]);
}
}
And last, create a index.jsp file for testing bussiness method –>getCustomersInState()
<%– 
******** : index
Created on : 14.June.2011, 20:29:36
Author : tunamert-tore
–%>
<%@page import=”com.tunatore.hibernateexample.HibernateManager”%>
<%@page import=”org.hibernate.SessionFactory”%>
<%@page import=”com.tunatore.hibernateexample.Customer”%>
<%@page import=”com.tunatore.hibernateexample.HibernateExample”%>
<%@page contentType=”text/html” pageEncoding=”UTF-8″%>
<!DOCTYPE html>
<html>
<head>
<**** http-equiv=”Content-Type” content=”text/html; charset=UTF-8″>
<title>Customers in State –> MI</title>
</head>
<body >
<h1>Customers</h1>
<table width=”600px” border=”1″ bgcolor=”#FFF380″> 
<tr>
<th width=”100px”>Customer_ID</th>
<th width=”100px”>City</th>
<th width=”100px”>State</th>
<th width=”100px”>Name</th>
</tr>
<tr> 
<%
Customer[] customerArr = HibernateExample.getCustomersInState(“MI”);
for(int i=0; i < customerArr.length; i++){
%> 
<tr>
<td><b><%=customerArr[i].getCustomer_ID()%></b></td>
<td><b><%=customerArr[i].getName()%></b></td>
<td><b><%=customerArr[i].getCity()%></b></td>
<td><b><%=customerArr[i].getState()%></b></td> 
</tr>
<%
}
HibernateManager.getSessionFactory().getCurrentSession().disconnect();
%> 
</tr>
</table>
</body>
</html>
 
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