hibernate初学记录

1.在eclipse中创建java项目
手动创建一个lib文件夹导入所需jar包
jar包来源：下载hibernate

图示路径中的所有jar包都导入lib中
还有mysql的驱动jar包，建议不要用太高的版本容易出错，版本问题使我困扰了很久
日志记录相关的jar包也要导入


这四个jar包我也不太清楚干啥的，找了大佬的解答导入之后解决了我当时的问题。
2.创建数据库
这里我使用的是navicat创建一个数据库名为hibernate1.

3.创建实体类
在src目录下新建一个包，建立类User.java

package cn.itcast.entity;
public class User {
	private int uid;
	private String username;
	private String password;
	private String address;
	public int getuid() {
		return uid;
	}
	public void setuid(int uid) {
		this.uid = uid;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
}

4.hibernate映射文件
实体类.hbm.xml
也位于实体类的包里面

<?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 table="t_user" name="cn.itcast.entity.User">
<id name="uid" column="uid" type="int">
<generator class="native"/>
</id>
<property name="username" column="username"/>
<property name="password" column="password"/>
<property name="address" column="address"/>
</class>
</hibernate-mapping>

5.hibernate核心配置文件
hibernate.cfg.xml
位于src下

<?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.url">jdbc:mysql:///hibernate1</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">123456</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<mapping resource="cn/itcast/entity/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>

6.测试
在src下新建一个包cn.itcast.hibernatetest，创建测试类HibernateDemo.java

package cn.itcast.hibernatetest;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

import cn.itcast.entity.User;

public class HibernateDemo {

	@Test
	public void testAdd() {
		Configuration cfg = new Configuration();
		cfg.configure();	
		SessionFactory sessionFactory = cfg.buildSessionFactory();
		Session session = sessionFactory.openSession();
		Transaction tx = session.beginTransaction();
		User user = new User();
		user.setUsername("小马");
		user.setPassword("1314520");
		user.setAddress("美国");
		session.save(user);
		tx.commit();
		session.close();
		sessionFactory.close();
	}
}

然后运行方式选junit测试即可。
控制台输出如图所示

数据库如图所示

代码来源：黑马程序员。