package com.mybatis.dao;

import com.mybatis.bean.Employee;

public interface EmployeeMapper {

    public Employee getEmpById(Integer id);

    public void addEmp(Employee employee);

    public void updateEmp(Employee employee);

    public void deleteEmpById(Integer id);

}

<?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.mybatis.dao.EmployeeMapper">

    <!--public Employee getEmpById(Integer id);-->

    <select id="getEmpById" resultType="com.mybatis.bean.Employee">

		select * from tbl_employee where id = #{id}

	</select>

    <!--public void addEmp(Employee employee);-->

    <!-- parameterType：参数类型，可以省略-->

    <insert id="addEmp" parameterType="com.mybatis.bean.Employee">

        insert into tbl_employee(last_name, gender, email)

        values (#{lastName},#{gender},#{email})

    </insert>

    <!--public void updateEmp(Employee employee);-->

    <update id="updateEmp">

        update tbl_employee set last_name=#{lastName},email=#{email},gender=#{gender} where id=#{id}

    </update>

    <!--public void deleteEmpById(Integer id);-->

    <delete id="deleteEmpById">

        delete from tbl_employee where id=#{id}

    </delete>

</mapper>

package com.mybatis.demo;

import java.io.IOException;

import java.io.InputStream;

import com.mybatis.bean.Employee;

import com.mybatis.dao.EmployeeMapper;

import org.apache.ibatis.io.Resources;

import org.apache.ibatis.session.SqlSession;

import org.apache.ibatis.session.SqlSessionFactory;

import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import org.junit.Test;

public class MyTest {

    public SqlSessionFactory getSqlSessionFactory() throws IOException {

        String resource = "mybatis-config.xml";

        InputStream inputStream = Resources.getResourceAsStream(resource);

        return new SqlSessionFactoryBuilder().build(inputStream);

    }

    /**

     * 测试增删改

     * 1、mybatis允许增删改直接定义以下类型返回值

     * Integer、Long、Boolean、void

     * 2、需要手动提交数据

     * sqlSessionFactory.openSession();===》手动提交

     * sqlSessionFactory.openSession(true);===》自动提交

     */

    @Test

    public void testSelect() throws IOException {

        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();

        SqlSession openSession = sqlSessionFactory.openSession();

        try {

            EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);

            Employee employee = mapper.getEmpById(1);

            System.out.println(employee);

        } finally {

            openSession.close();

        }

    }

    @Test

    public void testInsert() throws IOException {

        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();

        //此处获取到的SqlSession不会自动提交数据

        SqlSession openSession = sqlSessionFactory.openSession();

        try {

            EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);

            mapper.addEmp(new Employee("jetty", "jetty@126.com", 1));

            //手动提交数据

            openSession.commit();

        } finally {

            openSession.close();

        }

    }

    @Test

    public void testUpdate() throws IOException {

        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();

        SqlSession openSession = sqlSessionFactory.openSession();

        try {

            EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);

            mapper.updateEmp(new Employee(2, "jerry", "jerry@qq.com", 1));

            openSession.commit();

        } finally {

            openSession.close();

        }

    }

    @Test

    public void testDelete() throws IOException {

        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();

        //自动提交

        SqlSession openSession = sqlSessionFactory.openSession(true);

        try {

            EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);

            mapper.deleteEmpById(2);

        } finally {

            openSession.close();

        }

    }

}