【转载】Intellij IDEA的Hibernate简单应用
package com.yyq.dao;
import javax.persistence.*;
@Entity
@Table(name = "user", schema = "", catalog = "demo")
public class UserEntity {
private int id;
private String username;
private String password;
private String email;
@Id
@Column(name = "id", nullable = false, insertable = true, updatable = true, length = 10, precision = 0)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "username", nullable = true, insertable = true, updatable = true, length = 50, precision = 0)
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Basic
@Column(name = "password", nullable = true, insertable = true, updatable = true, length = 50, precision = 0)
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Basic
@Column(name = "email", nullable = true, insertable = true, updatable = true, length = 50, precision = 0)
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
UserEntity that = (UserEntity) o;
if (id != that.id) return false;
if (email != null ? !email.equals(that.email) : that.email != null) return false;
if (password != null ? !password.equals(that.password) : that.password != null) return false;
if (username != null ? !username.equals(that.username) : that.username != null) return false;
return true;
}
@Override
public int hashCode() {
int result = id;
result = 31 * result + (username != null ? username.hashCode() : 0);
result = 31 * result + (password != null ? password.hashCode() : 0);
result = 31 * result + (email != null ? email.hashCode() : 0);
return result;
}
}
7)配置hibernate.cfg.xml 如下。
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">jdbc:mysql://localhost:3306/demo</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.username">root</property>
<property name="connection.password">123456</property>
<property name="current_session_context_class">thread</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<!-- DB schema will be updated if needed -->
<!-- <property name="hbm2ddl.auto">update</property> -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping class="com.yyq.dao.UserEntity"/>
</session-factory>
</hibernate-configuration>
8)生成测试路径。在Module路径下生成一个文件夹,与src同级,名为test,点击文件夹test,右键,选择Mark Directory As - > Test Sources Root。
package com.yyq;
import com.yyq.dao.UserEntity;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Before;
import org.junit.Test; public class DAOTest {
Configuration config = null;
SessionFactory sessionFactory = null;
Session session = null;
Transaction tx = null;
@Before
public void init() {
config = new Configuration().configure("/hibernate.cfg.xml");
sessionFactory = config.buildSessionFactory();
session = sessionFactory.openSession();
tx = session.beginTransaction();
}
//增加
@Test
public void insert() {
UserEntity ue = new UserEntity();
ue.setUsername("Anny");
ue.setPassword("123");
ue.setEmail("Anny@163.com");
session.save(ue);
tx.commit();
}
//修改
@Test
public void update() {
UserEntity user = (UserEntity) session.get(UserEntity.class, new Integer(2));
user.setUsername("Penny");
session.update(user);
tx.commit();
session.close();
}
//查找
@Test
public void getById() {
UserEntity user = (UserEntity) session.get(UserEntity.class, new Integer(8));
tx.commit();
session.close();
System.out.println("ID号:" + user.getId() + ";用户名:" + user.getUsername() +
";密码:" + user.getPassword() + ";邮件:" + user.getEmail());
}
//删除
@Test
public void delete() {
UserEntity user = (UserEntity) session.get(UserEntity.class, new Integer(6));
session.delete(user);
tx.commit();
session.close();
}
}
10)运行测试类,可以一个一个方法的进行运行,也可以在类名处将所有的测试方法都一起运行。全部运行成功!
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>Struts2AndHibernate</display-name>
<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>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
2)将相关的Jar包复制到lib文件夹下。
3)创建一个名为ListAllAction.java文件。
package com.yyq.action;
import com.googlecode.s2hibernate.struts2.plugin.annotations.SessionTarget;
import com.googlecode.s2hibernate.struts2.plugin.annotations.TransactionTarget;
import com.opensymphony.xwork2.ActionSupport;
import com.yyq.dao.UserEntity;
import org.hibernate.Session;
import org.hibernate.Transaction;
import java.util.List;
public class ListAllAction extends ActionSupport {
//使用@SessionTarget标注得到Hibernate Session
@SessionTarget
private Session session = null;
//使用@TransactionTarget标注得到Hibernate Transaction
@TransactionTarget
private Transaction transaction = null;
private List<UserEntity> users;
public String list(){
try{
//得到user表中的所有记录
users = session.createCriteria(UserEntity.class).list();
transaction.commit();
session.close();
return SUCCESS;
}catch (Exception e){
e.printStackTrace();
return ERROR;
}
}
public List<UserEntity> getUsers(){
return users;
}
public void setUsers(List<UserEntity> users){
this.users = users;
}
}
4)修改index.jsp文件以显示后台数据库的数据获取情况。
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>显示数据</title>
</head>
<body>
<table>
<tr>
<th>ID</th>
<th>用户名</th>
<th>密码</th>
<th>邮箱</th>
</tr>
<s:iterator value="users" var="obj">
<tr>
<td><s:property value="id"/></td>
<td><s:property value="username"/></td>
<td><s:property value="password"/></td>
<td><s:property value="email"/></td>
</tr>
</s:iterator>
</table>
</body>
</html>
5)配置struts.xml文件。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
<!--s2hibernate插件里面有一个叫hibernate-default的package,
它里面的拦截器用于实现struts2+hibernate整合-->
<package name="default" extends="hibernate-default">
<!--defaultStackHibernate里面的拦截器会识别出@SessionTarget,@TransactionTarget等标注,
然后将hibernate注入进去-->
<default-interceptor-ref name="defaultStackHibernate"/>
<default-class-ref class="com.yyq.action.ListAllAction"/>
<action name="listAll" method="list">
<result>index.jsp</result>
</action>
</package>
</struts>
6)启动Tomcat,输入:http://localhost:8080/listAll.action
7)项目结构图。
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