标签：Opens tst bean utf-8 OLE 通过 mes delect use
前言
通过前几张的博文已经知道MyBatis是如何查询数据库中的数据，现在来介绍增（insert）删（delete）改（update）
增加
接口绑定文件定义一个增加方法，方法的返回值为long，在MyBatis中返回的是受影响行数。
public interface MusicImp { public Long getinsertMusic(Music music); }
SQL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="com.mybatis.dao.MusicImp"> <insert id="getinsertMusic" parameterType="com.mybatis.bean.Music"> INSERT INTO test (id,name,music,musicurl) VALUES (#{id},#{name},#{music},#{musicurl}); </insert> </mapper>
测试类
public void test() throws IOException { String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); //获取SqlSession对象 SqlSession addSession = sqlSessionFactory.openSession(); try { MusicImp musicImp = addSession.getMapper(MusicImp.class); Music music = new Music(9,"沈宁","还有多少个十年",null); long addlong =musicImp.getinsertMusic(music); System.out.println(addlong); addSession.commit(); } finally { // TODO: handle finally clause addSession.close(); } }
删除
接口绑定文件定义一个删除方法，方法的返回值为Boolean，Boolean只有两个值要么为真要么为假，使用此返回值可以判断是否删除成功。
public interface MusicImp { public boolean getdelectMusic(int id); }
SQL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="com.mybatis.dao.MusicImp"> <delete id="getdelectMusic" parameterType="com.mybatis.bean.Music"> delete from test where id = #{id}; </delete> </mapper>
测试类
public void test() throws IOException { String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); //获取SqlSession对象 SqlSession delectSession = sqlSessionFactory.openSession(); try { MusicImp musicImp = delectSession.getMapper(MusicImp.class); boolean deleteboolean = musicImp.getdelectMusic(7); System.out.println(deleteboolean); delectSession.commit(); } finally { // TODO: handle finally clause delectSession.close(); } }
修改
接口绑定文件定义一个修改方法，方法的返回值为Boolean，Boolean只有两个值要么为真要么为假，使用此返回值可以判断是否删除成功。
public interface MusicImp { public boolean getupdateMusic(@Param("musicurl")String musicurl,@Param("id")String id); }
SQL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="com.mybatis.dao.MusicImp"> <update id="getupdateMusic" parameterType="com.mybatis.bean.Music"> update test set musicurl = #{musicurl} where id = #{id}; </update> </mapper>
测试类
public void test() throws IOException { String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); //获取SqlSession对象 SqlSession updateSession = sqlSessionFactory.openSession(); try { MusicImp musicImp = updateSession.getMapper(MusicImp.class); boolean updatemusic = musicImp.getupdateMusic ("http://music.163.com/song/media/outer/url?id=392897.mp3", "5"); if (updatemusic) { System.out.println("更新成功"); } else { System.out.println("更新失败"); } updateSession.commit(); } finally { updateSession.close(); } }
标签：Opens tst bean utf-8 OLE 通过 mes delect use
原文地址：https://www.cnblogs.com/yogouo/p/12044266.html
