MyBatis 实现简单的 增加 查找

一个简单的POJO类

package com.test.pojo;

public class User {
	
	private String name;
	private String password;
	
	public User(){
		
	}
	
	public User(String name,String password){
		this.name=name;
		this.password=password;
	}
	
	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;
	}
	

}

 定义DAO接口UserMapper

package com.test.dao;

import com.test.pojo.User;

public interface UserMapper {
	
	public void insertUser(User user);
	
	public User getUser(String name);

}

 不需要写DAO的实现,只需要创建一个UserMapper.xml 接口映射文件 

<?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="com.test.dao.UserMapper"><!-- namespace是UserMapper接口的路径 -->
	<insert id="insertUser" parameterType="User"><!-- id为接口中方法名,parameterType参数类型 -->
		insert into user(name,password) values(#{name},#{password})
	</insert>
	<select id="getUser" resultType="User" parameterType="java.lang.String"><!-- resultType返回值类型 -->
		select * from user where name=#{name}
	</select>
</mapper>

 MyBatis 还需要一个配置文件,mybatis-config.xml

<?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>
	<settings>
		<setting name="cacheEnabled" value="false" />   
        <setting name="useGeneratedKeys" value="true" />   
        <setting name="defaultExecutorType" value="REUSE" /> 
	</settings>
	<typeAliases>
		<typeAlias alias="User" type="com.test.pojo.User"/>
	</typeAliases>
	<environments default="development">
		<environment id="development">
			<transactionManager type="jdbc"/>
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver"/>
				<property name="url" value="jdbc:mysql://localhost:3306/sample_db?useUnicode=true&amp;characterEncoding=utf-8"/>
				<property name="username" value="root"/>
				<property name="password" value=""/>
			</dataSource>
		</environment>
	</environments>
	<mappers>
		<mapper resource="com/test/dao/UserMapper.xml"/>
	</mappers>
</configuration>

 一个MyBatisUtil工具类

package com.test.data;

import java.io.IOException;
import java.io.Reader;

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

public class MyBatisUtil {
	
	private static SqlSessionFactory sqlSessionFactory;
	
	static{
		String str="config/mybatis-config.xml";
		Reader reader=null;
		try {
			reader=Resources.getResourceAsReader(str);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println(e.getMessage());
		}
		sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
	}
	
	public static SqlSessionFactory getSqlSessionFactory(){
		return sqlSessionFactory;
	}

}

 一个Test类 中测试

package com.test.dao.impl;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import com.test.dao.UserMapper;
import com.test.data.MyBatisUtil;
import com.test.pojo.User;

public class Test {
	
	public static void main(String[] args) {
		SqlSessionFactory ssf=MyBatisUtil.getSqlSessionFactory();
		SqlSession sqlSession=ssf.openSession();
		UserMapper userMapper=sqlSession.getMapper(UserMapper.class);
		User user=new User("tom","sdfsdfd");
		userMapper.insertUser(user);
		sqlSession.commit();
	}

}

 数据库一张user表 name password两个字段,如有不明可下载附件