Hibernate总结之Hello，World

Posted 2020-09-19

1. 引入相关maven依赖：

<dependency>
	<groupId>org.hibernate</groupId>
	<artifactId>hibernate-core</artifactId>
	<version>5.2.10.Final</version>
</dependency>

<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>6.0.6</version>
</dependency>

2. 创建hibernate.cfg.xml文件

<?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.connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">toor</property>
        <property name="hibernate.connection.url">jdbc:mysql:///hibernate_test?serverTimezone=UTC&amp;characterEncoding=utf8</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        
        <property name="hbm2ddl.auto">update</property>
        <property name="hibernate.show_sql">true</property> 
        <property name="format_sql">true</property>
        
        <mapping resource="org/cc11001100/hibernate/domain/User.hbm.xml" />
        
    </session-factory>
    
</hibernate-configuration>

3. 创建DO类

User：

package org.cc11001100.hibernate.domain;

import java.util.Date;

/**
 * 用户实体
 * 
 * @author CC11001100
 *
 */
public class User {

	/**创建时间*/
	private Date createTime;
	
	/**上次更新时间*/
	private Date updateTime;
	
	/**主键*/
	private String id;
	
	/**用户名*/
	private String username;
	
	/**密码*/
	private String passwd;

	public Date getCreateTime() {
		return createTime;
	}

	public void setCreateTime(Date createTime) {
		this.createTime = createTime;
	}

	public Date getUpdateTime() {
		return updateTime;
	}

	public void setUpdateTime(Date updateTime) {
		this.updateTime = updateTime;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPasswd() {
		return passwd;
	}

	public void setPasswd(String passwd) {
		this.passwd = passwd;
	}
	
}

4. 创建user.hbm.xml文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-5-20 22:08:10 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="org.cc11001100.hibernate.domain.User" table="USER">
        <id name="id" type="java.lang.String">
            <column name="ID" />
            <generator class="assigned" />
        </id>
        <property name="createTime" type="java.util.Date">
            <column name="CREATETIME" />
        </property>
        <property name="updateTime" type="java.util.Date">
            <column name="UPDATETIME" />
        </property>
        <property name="username" type="java.lang.String">
            <column name="USERNAME" />
        </property>
        <property name="passwd" type="java.lang.String">
            <column name="PASSWD" />
        </property>
    </class>
</hibernate-mapping>

5. 保存一个对象到数据库中

@Test
public void test_001(){
	
	SessionFactory sessionFactory=new Configuration().configure().buildSessionFactory();
	Session session=sessionFactory.openSession();
	
	try {
		session.beginTransaction();
		
		User user=new User();
		user.setId(UUID.randomUUID().toString().replaceAll("-", ""));
		user.setCreateTime(new Date());
		user.setUpdateTime(new Date());
		user.setUsername("username");
		user.setPasswd("passwd");
		
		session.save(user);
		session.getTransaction().commit();
	} catch (Exception e) {
		session.getTransaction().rollback();
		e.printStackTrace();
	}finally{
		try {
			session.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}