The true power of MyBatis is in the Mapped Statements. This is where the magic happens.

CUD

• mybatis运行CUD直接定义以下类型返回值
  • Integer,Long,Boolean
• 我们需要手动提交数据
  • sqlSessionFactory.openSession();—>手动提交
  • sqlSessionFactory.openSession(true);—>自动提交

接口：

package com.atguigu.mybatis.dao;import com.atguigu.mybatis.bean.Employee;public interface EmployeeMapper {public Employee getEmpById(Integer id);public Long addEmp(Employee employee);public boolean updateEmp(Employee employee);public void deleteEmpById(Integer id);}

映射文件:

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.atguigu.mybatis.dao.EmployeeMapper"><select id="getEmpById" resultType="employee">select id,last_name,email,gender from tb1_employee where id = #{id}</select><!--parameterType:可以省略--><insert id="addEmp" parameterType="com.atguigu.mybatis.bean.Employee" useGeneratedKeys="true" keyProperty="id" >insert into tb1_employee(last_name,email,gender)values(#{lastName},#{email},#{gender})</insert><!--public void updateEmp(Employee employee)--><update id="updateEmp">update tb1_employeeset last_name = #{lastName},email = #{gender}where id = #{id}</update><!--public void deleteEmpById(Integer id);--><delete id = "deleteEmpById">delete from tb1_employee where id = #{id}
</delete></mapper>

在这里就测试一个addEmp函数：

  @Testpublic void test02() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession = sqlSessionFactory.openSession();try{EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);Employee employee = new Employee(null, "jack", "jack@qq.com", "1");mapper.addEmp(employee);//手动提交数据sqlSession.commit();}finally {sqlSession.close();}}