Hibernate入门案例

末蓝、 2022-06-01 09:13 225阅读 0赞

**[项目源码下载][Link 1]**提供MyEclipse和Eclipse下的项目源码以及war文件

假设已经配置好了所有环境(jdk,tomcat,hibernate)

#### **一，创建项目并导入jar包** ####

打开eclipse或myeclipse创建web项目

将Hibernate所需jar包导入到项目的WEB-INF/lib目录中

![SouthEast][]

#### 二，创建数据库及表 ####

在MySQL中创建一个名称为hibernate的数据库，在该数据下创建一张名为user的表

在表中创建两个字段name和password name为主键

![SouthEast 1][]

#### 三，编写实体类 ####

在src目录下创建名称为cn.itcast.domain的包，在该包下创建实体类User

User.java

package com.itcast.domain;
    
    public class User {
    	private String name="1";
    	private String password="1";
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	@Override
    	public String toString() {
    		return "User [name=" + name + ", password=" + password + "]";
    	}
    	
    	
    }

#### 四，编写映射文件User.hbm.xml ####

在实体类User的包中创建文件User.hbm.xml

User.hbm.xml

<?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">
    
        
    <hibernate-mapping>
    	<class name="com.itcast.domain.User" table="user">
    		<id name="name" column="name">
    			
    		</id>
    		<property name="password" column="password" type="string"/>
    	</class>
    	
    </hibernate-mapping>

#### 五，编写核心配置文件 hibernate.cfg.xml ####

在src目录下创建文件hibernate.cfg.xml

hibernate.cfg.xml:

<?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="hibernate.dialect">
    			org.hibernate.dialect.MySQLDialect
    		</property>
    		
    		<property name="hibernate.connection.driver_class">
    			com.mysql.jdbc.Driver
    		</property>
    		
    		<property name="hibernate.connection.url">
    			jdbc:mysql://localhost:3306/hibernate
    		</property>
    		
    		<property name="hibernate.connection.username">
    			root
    		</property>
    		
    		<property name="hibernate.connection.password">
    			your sql password 
    		</property>
    		
    		
    		<property name="hibernate.show_sql">true</property>
    		
    		<property name="hibernate.format_sql">true</property>
    		
    		<mapping resource="com/itcast/domain/User.hbm.xml"/>
    	</session-factory>
    </hibernate-configuration>

** 注：数据库登录用户名和密码填你自己的数据库的账户和密码**

#### 六，编写测试类，进行增删查改 ####

在src目录项创建名为cn.itcast.test的包，在改包创建类UserTest

在该类里面添加四个测试方法：insertTest() updateTest() findByNameTest() deleteByName()

UserTest.java:

package com.itcast.test;
    
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.Transaction;
    import org.hibernate.cfg.Configuration;
    import org.junit.Test;
    
    import com.coderyx.domain.User;
    
    public class UserTest {
    	@Test
    	public void insertTest(){
    		//加载cfg配置文件
    		Configuration config = new Configuration().configure();
    		//获取sessionfactory
    		SessionFactory sessionFactory = config.buildSessionFactory();
    		//调用一个session
    		Session session = sessionFactory.openSession();
    		//开启事物
    		Transaction t = session.beginTransaction();
    		
    		User user = new User();
    		user.setName("tom");
    		user.setPassword("123");
    		//将数据存储到表中
    		session.save(user);
    		//提交事物
    		t.commit();
    		//关闭资源
    		session.close();
    		sessionFactory.close();
    	}
    	
    	@Test
    	public void updateTest(){
    		//加载cfg配置文件
    		Configuration config = new Configuration().configure();
    		//获取sessionfactory
    		SessionFactory sessionFactory = config.buildSessionFactory();
    		//调用一个session
    		Session session = sessionFactory.openSession();
    		//开启事物
    		Transaction t = session.beginTransaction();
    		
    		User user = new User();
    		user.setName("tom");
    		user.setPassword("456");
    		//将数据存储到表中
    		session.update(user);
    		//提交事物
    		t.commit();
    		//关闭资源
    		session.close();
    		sessionFactory.close();
    	}
    	
    	
    	@Test
    	public void findByNameTest(){
    		//加载cfg配置文件
    		Configuration config = new Configuration().configure();
    		//获取sessionfactory
    		SessionFactory sessionFactory = config.buildSessionFactory();
    		//调用一个session
    		Session session = sessionFactory.openSession();
    		//开启事物
    		Transaction t = session.beginTransaction();
    		
    		
    		//两个方法都可以 get()  load()
    		User user = (User)session.get(User.class, "tom");
    		//User user = (User)session.load(User.class, "tom");
    		
    		
    		System.out.println(user);
    		//提交事物
    		t.commit();
    		//关闭资源
    		session.close();
    		sessionFactory.close();
    	}
    	
    	
    	@Test
    	public void deleteByNameTest(){
    		//加载cfg配置文件
    		Configuration config = new Configuration().configure();
    		//获取sessionfactory
    		SessionFactory sessionFactory = config.buildSessionFactory();
    		//调用一个session
    		Session session = sessionFactory.openSession();
    		//开启事物
    		Transaction t = session.beginTransaction();
    		
    		User user = (User)session.get(User.class, "tom");
    		
    		session.delete(user);
    		//提交事物
    		t.commit();
    		//关闭资源
    		session.close();
    		sessionFactory.close();
    	}
    	
    }

分别测试四个方法：

insertTest()

![SouthEast 2][]

updateTest()

![SouthEast 3][]

findByNameTest()

![SouthEast 4][]

deleteByName()

![SouthEast 5][]

注：关于Junit测试

项目右键->properties->java build path->libraries->add libraries->Junit

使用双击选中测试方法右键run as ->junit test

[Link 1]: http://download.csdn.net/download/qq_34731703/10238648
[SouthEast]: /images/20220601/a5265d63414e4deb815d46e6dccf1c75.png
[SouthEast 1]: /images/20220601/97660617b0694934b1d516134370dd32.png
[SouthEast 2]: /images/20220601/bf8655f1313340c490e21dd82b0c100e.png
[SouthEast 3]: /images/20220601/e37fb9f79da04e9f9c342d14b0a70142.png
[SouthEast 4]: /images/20220601/895949e43b6047e1a2e01c1a15679535.png
[SouthEast 5]: /images/20220601/f72ce93aea204b738702522cfa9b17c4.png