MyBatis日记（四）：MyBatis——insert、update、delete、select

MyBatis简单增删改查操作，此处所做操作，皆是在之前创建的MyBatis的Hello world的工程基础上所做操作。

首先在接口文件（personMapper.java）中，添加操作方法：

 package com.Aiden.dao;

 import java.util.List;

 import com.Aiden.domain.Person;

 public interface personMapper {
     /**
      * 添加人员
      * @param person
      */
     public void addPerson(Person person);
     /**
      * 删除人员
      * @param id
      */
     public void deletePerson(Integer id);
     /**
      * 更新人员
      * @param person
      */
     public void updatePerson(Person person);
     /**
      * 根据Id查找人员
      * @param id
      * @return
      */
     public Person findPersonById(Integer id);
     /**
      * 查询所有人员
      * @return
      */
     public List<Person> findPerson();
 }

然后在映射文件（personMapper.xml）中添加用于实现的标签及SQL语句：

 <?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.Aiden.dao.personMapper">

     <resultMap type="Person" id="resultPerson">
         <id property="id" column="id"/>
         <result property="name" column="name"/>
         <result property="age" column="age"/>
     </resultMap>

     <insert id="addPerson" parameterType="Person">
         insert into t_person values (null,#{name},#{age})
     </insert>

     <update id="updatePerson" parameterType="Person">
         update t_person set name=#{name},age=#{age} where id=#{id}
     </update>

     <delete id="deletePerson" parameterType="Integer">
         delete from t_person where id=#{id}
     </delete>

     <select id="findPersonById" parameterType="Integer" resultType="Person">
         select * from t_person where id=#{id}
     </select>

     <select id="findPerson" resultType="Person">
         select * from t_person
     </select>

 </mapper>

最后在Junit测试类（MyBatisDemo01.java）中添加测试方法：

 package com.Aiden.service;

 import java.util.List;

 import org.apache.ibatis.session.SqlSession;
 import org.apache.log4j.Logger;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;

 import com.Aiden.dao.personMapper;
 import com.Aiden.domain.Person;
 import com.Aiden.util.SqlSessionFactoryUtil;

 public class MybatisDemo01 {
     private static Logger logger=Logger.getLogger(MybatisDemo01.class);
     private static SqlSession sqlSession=null;
     private static personMapper personMapper=null;

     @Before
     public void setUp() throws Exception {
         sqlSession=SqlSessionFactoryUtil.openSession();
         personMapper=sqlSession.getMapper(personMapper.class);
     }

     @After
     public void tearDown() throws Exception {
         sqlSession.close();
     }

     @Test
     public void testAddPerson() {
         logger.info("添加人员");
         Person person=new Person("波多野结衣",24);
         personMapper.addPerson(person);
         sqlSession.commit();
     }

     @Test
     public void testUpdatePerson() {
         logger.info("修改人员");
         Person person=new Person(2,"武藤兰",24);
         personMapper.updatePerson(person);
         sqlSession.commit();
     }

     @Test
     public void testFindPersonById() {
         logger.info("根据ID查询人员");
         Person person = personMapper.findPersonById(2);
         System.out.println(person);
     }

     @Test
     public void testFindPerson() {
         logger.info("查询所有人员");
         List<Person> allPerson = personMapper.findPerson();
         for (Person person : allPerson) {
             System.out.println(person);
         }
     }

     @Test
     public void testDeletePerson() {
         logger.info("删除人员");
         personMapper.deletePerson(2);
         sqlSession.commit();
     }

 }