Creating a simple page where user inputs user ID and fetch data from DATABASE , with the help of hibernate.
DataBase:hiber
CREATE TABLE `hiber`.`emp` (
`id` INT NOT NULL,
`name` VARCHAR(45) NULL,
`salary` INT NULL);
DataBase:hiber
CREATE TABLE `hiber`.`emp` (
`id` INT NOT NULL,
`name` VARCHAR(45) NULL,
`salary` INT NULL);
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Struts.XML
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="connecthiber" extends="struts-default" >
<action name="form1"
class="connecthiber.ConnectAction" method="execute">
<result name="success">welcome.jsp</result>
</action>
</package>
</struts>
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welcome.jsp
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>HIBERNATE example</title>
</head>
<body>
<s:form action="form1" method="post">
<s:textfield name="searchid"></s:textfield>
<s:submit value="Search" align="center" />
</s:form>
<h2>Employee</h2>
<table>
<tr>
<th>Name</th>
<th>Salary</th>
</tr>
<s:iterator value="contactList" var="Emp">
<tr>
<td><s:property value="name" /></td>
<td><s:property value="salary" /></td>
</tr>
</s:iterator>
</table>
</body>
</html>
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ConnectManager.java
package connecthiber;
import hiber.HibernateUtil;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
public class ConnectManager extends HibernateUtil{
public int searchid=1;
@SuppressWarnings("unchecked")
public List<Emp> list(int searchid) {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
List<Emp> contacts = null;
try {
String hql = "FROM Emp E WHERE E.id = :searchid";
Query query = session.createQuery(hql);
query.setParameter("searchid",searchid);
contacts = query.list();
/*contacts = (List<Emp>)session.createQuery("from Emp e where e.id=:searchid").setParameter("searchid",searchid).list();*/
session.getTransaction().commit();
return contacts;
}
catch (HibernateException e) {
e.printStackTrace();
session.getTransaction().rollback();
}
session.getTransaction().commit();
return contacts;
}
}
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ConnectAction.java
package connecthiber;
import connecthiber.Emp;
import connecthiber.ConnectManager;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
public class ConnectAction extends ActionSupport {
private List<Emp> contactList;
private int searchid;
/**
* @return the searchid
*/
public int getSearchid() {
return searchid;
}
/**
* @param searchid the searchid to set
*/
public void setSearchid(int searchid) {
this.searchid = searchid;
}
public List<Emp> getContactList() {
return contactList;
}
/**
* @param contactList
* the contactList to set
*/
public void setContactList(List<Emp> contactList) {
this.contactList = contactList;
}
public String execute() {
String ret;
ConnectManager connectManager = new ConnectManager();
try {
contactList = connectManager.list(searchid);
System.out.println("execute called");
ret = "success";
} catch (Exception e) {
System.out.println(e.getMessage());
ret = " error";
}
return ret;
}
}
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Emp.java
package connecthiber;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Id;
@Entity
@Table(name="emp")
public class Emp implements Serializable{
@Column(name="id")
private int id;
@Column(name="name")
private String name;
@Column(name="salary")
private Long salary;
/**
* @return the id
*/
@Id
public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the salary
*/
public Long getSalary() {
return salary;
}
/**
* @param salary the salary to set
*/
public void setSalary(Long salary) {
this.salary = salary;
}
}
hibernate.cfg.xml
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<?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="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/hiber
</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property name="connection.pool_size">10</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">
org.hibernate.cache.NoCacheProvider
</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping class="connecthiber.Emp" />
</session-factory>
</hibernate-configuration>
HibernateUtil.java
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package hiber;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
@SuppressWarnings("deprecation")
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
return new AnnotationConfiguration().configure()
.buildSessionFactory();
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
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web.xml
<?xml version="1.0" encoding="ISO-8859-1" ?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>hiber</display-name>
<welcome-file-list>
<welcome-file>welcome.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
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