Hibernate对数据库进行增删改查

数据库表结构

hibernate.cfg.xml

<?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.connection.driver_class">org.gjt.mm.mysql.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hello</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">123456</property>
        <property name="connection.pool_size">1</property>
        <property name="show_sql">true</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        
        
        <mapping resource="org/hibernate/entity/User.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

 User.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
 <class name="org.hibernate.entity.User" table="USER">
 
  <id column="id" name="id" >
   <generator class="native"/>
  </id>
  <property name="name" column="name"/>
  <property name="sex" column="sex"/>
  <property name="age" column="age"/>
  <property name="mail" column="mail"/>
  <property name="tel" column="tel"/>
 </class>
</hibernate-mapping>

User实体类

package org.hibernate.entity;

public class User implements java.io.Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1534611458588709655L;
	
	private int id;
	private String name;
	private String sex;
	private int age;
	private String mail;
	private String tel;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getMail() {
		return mail;
	}
	public void setMail(String mail) {
		this.mail = mail;
	}
	public String getTel() {
		return tel;
	}
	public void setTel(String tel) {
		this.tel = tel;
	}
	public User() {
		
	}
	public User(String name,String sex,int age,String mail,String tel) {
		this.name = name;
		this.sex = sex;
		this.age = age;
		this.mail = mail;
		this.tel = tel;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", age=" + age + ", mail=" + mail + ", tel=" + tel
				+ "]";
	}
	
}

 HibernateUtil.java

package org.hibernate.entity;
import org.hibernate.*;
import org.hibernate.cfg.*;
public class HibernateUtil {
	private static SessionFactory sessionFactory;
	private static final ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();
	static {
		try {
			Configuration cfg = new Configuration().configure();
			sessionFactory = cfg.buildSessionFactory();
		}catch(Throwable ex) {
			throw new ExceptionInInitializerError(ex);
			
		}
	}
	public static SessionFactory getSessionFactory() {
		return sessionFactory;
	}
	public static Session getSession()throws HibernateException {
		Session session = (Session)threadLocal.get();
		if(session == null || !session.isOpen()) {
			if(sessionFactory == null) {
				rebuildSessionFactory();
			}
			session = (sessionFactory !=null)?sessionFactory.openSession():null;
			threadLocal.set(session);
		}
		return session;
	}
	public static void closeSession()throws HibernateException{
		Session session = (Session)threadLocal.get();
		threadLocal.set(null);
		if(session != null) {
			session.close();
		}
	}
	public static void rebuildSessionFactory() {
		try {
			Configuration configuration=new Configuration().configure();
			configuration.configure("/hibernate.cfg.xml");
			sessionFactory = configuration.buildSessionFactory();
		}catch(Exception e) {
			System.err.println("Error Creating SessionFactory");
			e.printStackTrace();
		}
	}
	public static void shutdown() {
		getSessionFactory().close();
	}
}

增删改查（CURD）测试类

注意：HQL语句的 from User where ...中的User表名称是根据书写的映射关系User.hbm.xml文件名中的User决定。

否则报错：（tablename）is not mapped.

package org.hibernate.entity;

import static org.junit.Assert.*;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.junit.After;
import org.junit.Before;

public class Test {

	@Before
	public void setUp() throws Exception {
	}

	@After
	public void tearDown() throws Exception {
	}

	@org.junit.Test
	public void test() {
		fail("Not yet implemented");
	}
	
	@org.junit.Test
	public void TestCURD() {
		Session session = HibernateUtil.getSession();
		//开启事务
		session.beginTransaction();
		
		try {
			//增加
			User insertuser = new User("zhangsan","mail",20,"[email protected]","15823455678");
			session.save(insertuser);
			
			//删除
			User deleteuser = (User)session.get(User.class, 10);
			session.delete(deleteuser);
			session.flush();//刷新session
			
			//修改
			User updateuser = (User) session.get(User.class,2);
			updateuser.setMail("[email protected]");
			session.update(updateuser);
			
			//查询
			User queryuser = (User)session.get(User.class,3);
			System.out.println(queryuser.getId()+" "+queryuser.getName()+" "+queryuser.getSex());
				
			//提交事务
			session.getTransaction().commit();
			
		}catch(Exception e) {
			e.printStackTrace();
			//回滚事务
			session.getTransaction().rollback();
		}finally {
			session.close();
		}		
	}

}