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：

 1 package com.Aiden.dao;
 2 
 3 import java.util.List;
 4 
 5 import com.Aiden.domain.Person;
 6 
 7 public interface personMapper {
 8     /**
 9      * 添加人员
10      * @param person
11      */
12     public void addPerson(Person person);
13     /**
14      * 删除人员
15      * @param id
16      */
17     public void deletePerson(Integer id);
18     /**
19      * 更新人员
20      * @param person
21      */
22     public void updatePerson(Person person);
23     /**
24      * 根据Id查找人员
25      * @param id
26      * @return
27      */
28     public Person findPersonById(Integer id);
29     /**
30      * 查询所有人员
31      * @return
32      */
33     public List<Person> findPerson();
34 }

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

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE mapper
 3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 
 6 <mapper namespace="com.Aiden.dao.personMapper">
 7 
 8     <resultMap type="Person" id="resultPerson">
 9         <id property="id" column="id"/>
10         <result property="name" column="name"/>
11         <result property="age" column="age"/>
12     </resultMap>
13 
14     <insert id="addPerson" parameterType="Person">
15         insert into t_person values (null,#{name},#{age})
16     </insert>
17     
18     <update id="updatePerson" parameterType="Person">
19         update t_person set name=#{name},age=#{age} where id=#{id}
20     </update>
21     
22     <delete id="deletePerson" parameterType="Integer">
23         delete from t_person where id=#{id}
24     </delete>
25     
26     <select id="findPersonById" parameterType="Integer" resultType="Person">
27         select * from t_person where id=#{id}
28     </select>
29     
30     <select id="findPerson" resultType="Person">
31         select * from t_person
32     </select>
33     
34 </mapper>

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

 1 package com.Aiden.service;
 2 
 3 import java.util.List;
 4 
 5 import org.apache.ibatis.session.SqlSession;
 6 import org.apache.log4j.Logger;
 7 import org.junit.After;
 8 import org.junit.Before;
 9 import org.junit.Test;
10 
11 import com.Aiden.dao.personMapper;
12 import com.Aiden.domain.Person;
13 import com.Aiden.util.SqlSessionFactoryUtil;
14 
15 public class MybatisDemo01 {
16     private static Logger logger=Logger.getLogger(MybatisDemo01.class);
17     private static SqlSession sqlSession=null;
18     private static personMapper personMapper=null;
19 
20     @Before
21     public void setUp() throws Exception {
22         sqlSession=SqlSessionFactoryUtil.openSession();
23         personMapper=sqlSession.getMapper(personMapper.class); 
24     }
25 
26     @After
27     public void tearDown() throws Exception {
28         sqlSession.close();
29     }
30 
31     @Test
32     public void testAddPerson() {
33         logger.info("添加人员");
34         Person person=new Person("波多野结衣",24);
35         personMapper.addPerson(person);
36         sqlSession.commit();
37     }
38     
39     @Test
40     public void testUpdatePerson() {
41         logger.info("修改人员");
42         Person person=new Person(2,"武藤兰",24);
43         personMapper.updatePerson(person);
44         sqlSession.commit();
45     }
46     
47     @Test
48     public void testFindPersonById() {
49         logger.info("根据ID查询人员");
50         Person person = personMapper.findPersonById(2);
51         System.out.println(person);
52     }
53     
54     @Test
55     public void testFindPerson() {
56         logger.info("查询所有人员");
57         List<Person> allPerson = personMapper.findPerson();
58         for (Person person : allPerson) {
59             System.out.println(person);
60         }
61     }
62     
63     @Test
64     public void testDeletePerson() {
65         logger.info("删除人员");
66         personMapper.deletePerson(2);
67         sqlSession.commit();
68     }
69 
70 }