Mybatis入门（增、删、改）

SQL映射文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="a.b" >
    <insert id="insertUser" parameterType="com.java.pojo.User">
    	<!-- selectKey：主键返回 
    		 keyProperty：User中的主键属性
    		 order：指定selectKey何时执行，有两个值分别为after和before-->
    	<!-- <selectKey keyProperty="id" order="AFTER">
    		SELECT LAST_INSERT_ID()
    	</selectKey> -->
    	INSERT INTO `php`.`stus`(`username`, `password`) VALUES (#{username}, #{password});
    </insert>
    
    <update id="updateUser" parameterType="com.java.pojo.User">
    	UPDATE `php`.`stus` SET `username` = #{username}, `password` = #{password} WHERE `id` = #{id};
    </update>
    
    <delete id="deleteUser" parameterType="int">
    	delete from php.stus where id = #{id}
    </delete>
    
</mapper>

SqlMapper.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- default 引用 environment 的 id,当前所使用的环境 -->
    <environments default="default">
<!-- 声明可以使用的环境 ，环境可以有多个（当连接不同数据库的时候）-->
    <environment id="default">
<!-- 使用原生 JDBC 事务 -->
        <transactionManager type="JDBC"></transactionManager>
        <dataSource type="POOLED">
            <property name="driver" value="com.mysql.jdbc.Driver"/>
            <property name="url" value="jdbc:mysql://localhost:3306/数据库名?useSSL=false"/>
            <property name="username" value="用户名"/>
            <property name="password" value="密码"/>
        </dataSource>
    </environment>
    </environments>
<mappers>
<mapper resource="mybatis/user.xml"/>
</mappers>
</configuration>

User类

package com.java.pojo;

public class User {

	private Integer id;
	private String username;// 用户姓名
	private String password;// 性别
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	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;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
	}
	
}

MybatisUtils 工具类

package com.java.utils;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MybatisUtils {
	
	private static SqlSessionFactory sqlSessionFactory;
	
	static {
		try {
			//创建SqlSessionFactoryBuilder对象
			SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
			//创建核心配置文件的输入流
			InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
			//通过输入流创建SqlSessionFactory对象
			sqlSessionFactory = ssfb.build(inputStream);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	//获取SqlSessionFactory
	public static SqlSessionFactory getSqlSessionFactory() {
		return sqlSessionFactory;
	}
}

测试类（插入）

public void insertUser() {
		SqlSessionFactory sessionFactory = MybatisUtils.getSqlSessionFactory();
		SqlSession session = sessionFactory.openSession();
		User user = new User();
		user.setUsername("小飞");
		user.setPassword("3223333");
		session.insert("a.b.insertUser",user);
		//提交事务
		session.commit(); //如果不想用这种可以在opensession()中添加一个true
		//释放资源
		session.close();
	}

修改更新

public void updateUser() {
		SqlSessionFactory sessionFactory = MybatisUtils.getSqlSessionFactory();
		SqlSession session = sessionFactory.openSession();
		User user = new User();
		user.setId(16);
		user.setUsername("string");
		user.setPassword("gdagaeger");
		session.update("a.b.updateUser",user);
		//提交事务
		session.commit();//如果不想用这种可以在opensession()中添加一个true
		//释放资源
		session.close();
	}

删除

public void deleteUser() {
		SqlSessionFactory sessionFactory = MybatisUtils.getSqlSessionFactory();
		SqlSession session = sessionFactory.openSession();
		User user = new User();
		user.setId(22);
		session.delete("a.b.deleteUser",user);
		//提交事务
		session.commit();//如果不想用这种可以在opensession()中添加一个true
		//释放资源
		session.close();
	}

正在尝试写博客，把会的分享给你们，如有写的不好的地方，希望指点一下，谢谢！