3_sqlSession完成DML所有操作

 Mapper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="EmpMapper3">
    <!--
    增删方法的返回值类型都是int
    resultType就无需指定了
    insert update delete 标签中没有resultType
    但是仍然可以有paramaterType
    -->
    <!-- 增加方法
    public int addEmp(Emp emp);
    -->
    <insert id="addEmp" parameterType="emp">
        insert into emp values(#{empno},#{ename},#{job},#{mgr},#{hiredate},#{sal},#{comm},#{deptno})
    </insert>
    <!--修改
    根据工号修改员工姓名
    public int updateEmp(Emp emp);
    -->
    <update id="updateEmp" parameterType="emp">
        update emp set ename = #{ename} where empno=#{empno}
    </update>
    <!-- 删除
    删除大于给定工号的员工信息
    public int deleteEmp(int empno)
    -->
    <delete id="deleteEmp" parameterType="int">
        delete from emp where empno >= #{empno}
    </delete>
</mapper>

测试代码

package com.msb.test;
import com.msb.pojo.Emp;
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.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
 * @Author: Ma HaiYang
 * @Description: MircoMessage:Mark_7001
 */
public class Test4 {
    private SqlSession sqlSession;
    @Before
    public void init(){
        SqlSessionFactoryBuilder ssfb =new SqlSessionFactoryBuilder();
        InputStream resourceAsStream = null;
        try {
            resourceAsStream = Resources.getResourceAsStream("sqlMapConfig.xml");
        } catch (IOException e) {
            e.printStackTrace();
        }
        SqlSessionFactory factory=ssfb.build(resourceAsStream) ;
        sqlSession=factory.openSession(true);
    }
    @Test
    public void testInsert(){
        Emp emp =new Emp(null,"按住啦Baby","SALESMAN",7839,new Date(),3100.0, 200.0,10 );
        int rows = sqlSession.insert("addEmp", emp);
        System.out.println(rows);
        // 手动提交事务
        //sqlSession.commit();
        /*增删改 要提交事务
        * sqlSession.commit();手动提交事务
        * sqlSession=factory.openSession(true); 设置事务自动提交
        * */
    }
    @Test
    public void testUpdate(){
        Emp emp =new Emp( );
        emp.setEname("晓明");
        emp.setEmpno(7937);
        int rows = sqlSession.update("updateEmp", emp);
        System.out.println(rows);
    }
    @Test
    public void testDelete(){
        int rows = sqlSession.delete("deleteEmp", 7936);
        System.out.println(rows);
    }
    @After
    public void release(){
        // 关闭SQLSession
        sqlSession.close();
    }
}