MyBatis-05 MyBatis XML方式之update/delete元素

2021-08-17 10:48:24 浏览数 (1)
  • 概述
  • update 用法
    • UserMapper接口中增加接口方法
    • UserMapper.xml中配置update 元素
    • 单元测试
  • delete用法
    • UserMapper接口中增加接口方法
    • UserMapper.xml中配置delete元素
    • 单元测试

概述

接着上篇博客 Mybatis-04Mybatis XML方式之insert元素，我们接着来学习 update和delete， 比较简单。

update 用法

需求： 通过主键更新sys_user

UserMapper接口中增加接口方法

代码语言：javascript复制
    /**
     * 
     * 
     * @Title: updateSysUserById
     * 
     * @Description: 修改SysUser
     * 
     * @param sysUser
     * @return
     * 
     * @return: int 受影响的行数,这里仅仅是为了做记录，void在实际业务中更常用
     */
    int updateSysUserById(SysUser sysUser);

UserMapper.xml中配置update 元素

代码语言：javascript复制
        update sys_user 
            set user_name = #{userName},
                user_password = #{userPassword},
                user_email = #{userEmail},
                user_info = #{userInfo},
                head_img = #{headImg, jdbcType=BLOB},
                create_time = #{createTime, jdbcType=TIMESTAMP}
            where id = #{id}

单元测试

代码语言：javascript复制
@Test
    public void updateSysUserByIdTest() {
        logger.info("updateSysUserByIdTest");
        // 获取SqlSession
        SqlSession sqlSession = getSqlSession();
        try {
            // 获取UserMapper接口
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            // 先根据ID查询出对应的sysuser
            SysUser sysUser = userMapper.selectSysUserById((long) 1);
            // 当前数据库用户的userName期望为admin
            Assert.assertEquals("admin", sysUser.getUserName());

            // 修改用户名
            sysUser.setUserName("adminUpdated");
            // 修改邮件
            sysUser.setUserEmail("updateSysUser@artisan.com");
            // 修改用户 ,返回受影响的行数
            int result = userMapper.updateSysUserById(sysUser);

            // 只插入一条数据 ,期望是1
            Assert.assertEquals(1, result);
            logger.info("受影响的行数:"   result);

            logger.info("userName:"   sysUser.getUserName()   ",userEmail:"   sysUser.getUserEmail());

            // 期望的用户名为adminUpdated
            Assert.assertEquals("adminUpdated", sysUser.getUserName());
            // 期望的邮箱为updateSysUser@artisan.com
            Assert.assertEquals("updateSysUser@artisan.com", sysUser.getUserEmail());


        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 为了保持测试数据的干净，这里选择回滚
            // 由于默认的sqlSessionFactory.openSession()是不自动提交的
            // 除非显式的commit，否则不会提交到数据库
            sqlSession.rollback();
            logger.info("为了保持测试数据的干净，这里选择回滚,不写入mysql,请观察日志，回滚完成");

            sqlSession.close();
            logger.info("sqlSession close successfully ");
        }
    }

日志

代码语言：javascript复制
2018-04-16 00:55:44,785  INFO [main] (BaseMapperTest.java:26) - sessionFactory bulit successfully
2018-04-16 00:55:44,788  INFO [main] (BaseMapperTest.java:29) - reader close successfully
2018-04-16 00:55:44,790  INFO [main] (UserMapperTest.java:271) - updateSysUserByIdTest
2018-04-16 00:55:45,193 DEBUG [main] (BaseJdbcLogger.java:142) - ==>  Preparing: select a.id, a.user_name, a.user_password, a.user_email, a.user_info, a.head_img, a.create_time from sys_user a where id = ? 
2018-04-16 00:55:45,247 DEBUG [main] (BaseJdbcLogger.java:142) - ==> Parameters: 1(Long)
2018-04-16 00:55:45,270 TRACE [main] (BaseJdbcLogger.java:148) - <==    Columns: id, user_name, user_password, user_email, user_info, head_img, create_time
2018-04-16 00:55:45,270 TRACE [main] (BaseJdbcLogger.java:148) - <==        Row: 1, admin, 123456, admin@artisan.com, <>, <>, 2018-04-13 21:12:47.0
2018-04-16 00:55:45,277 DEBUG [main] (BaseJdbcLogger.java:142) - <==      Total: 1
2018-04-16 00:55:45,278 DEBUG [main] (BaseJdbcLogger.java:142) - ==>  Preparing: update sys_user set user_name = ?, user_password = ?, user_email = ?, user_info = ?, head_img = ?, create_time = ? where id = ? 
2018-04-16 00:55:45,281 DEBUG [main] (BaseJdbcLogger.java:142) - ==> Parameters: adminUpdated(String), 123456(String), updateSysUser@artisan.com(String), 管理员用户(String), java.io.ByteArrayInputStream@74c176bf(ByteArrayInputStream), 2018-04-13 21:12:47.0(Timestamp), 1(Long)
2018-04-16 00:55:45,283 DEBUG [main] (BaseJdbcLogger.java:142) - <==    Updates: 1
2018-04-16 00:55:45,284  INFO [main] (UserMapperTest.java:292) - 受影响的行数:1
2018-04-16 00:55:45,284  INFO [main] (UserMapperTest.java:294) - userName:adminUpdated,userEmail:updateSysUser@artisan.com
2018-04-16 00:55:45,288  INFO [main] (UserMapperTest.java:309) - 为了保持测试数据的干净，这里选择回滚,不写入mysql,请观察日志，回滚完成
2018-04-16 00:55:45,289  INFO [main] (UserMapperTest.java:312) - sqlSession close successfully

update的基本用法就这么简单，更复杂的情况后面通过动态SQL中阐述。

delete用法

UserMapper接口中增加接口方法

代码语言：javascript复制
/**
     * 
     * 
     * @Title: deleteSysUserById
     * 
     * @Description: 根据ID删除sysuser
     * 
     * @param id
     * @return
     * 
     * @return: int
     */
    int deleteSysUserById(Long id);

UserMapper.xml中配置delete元素

代码语言：javascript复制
    <delete id="deleteSysUserById">
        delete from sys_user where id = #{id}
    delete>

单元测试

代码语言：javascript复制
    @Test
    public void deleteSysUserByIdTest() {
        logger.info("deleteSysUserByIdTest");
        // 获取SqlSession
        SqlSession sqlSession = getSqlSession();
        try {
            // 获取UserMapper接口
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            // 调用删除接口
            int result = userMapper.deleteSysUserById((long) 1);
            // 期望影响的结果条数为 1
            Assert.assertEquals(1, result);

            // 再次查询
            SysUser sysUser = userMapper.selectSysUserById((long) 1);
            // 期望查询出来的sysUser 为 null
            Assert.assertNull(sysUser);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 为了保持测试数据的干净，这里选择回滚
            // 由于默认的sqlSessionFactory.openSession()是不自动提交的
            // 除非显式的commit，否则不会提交到数据库
            sqlSession.rollback();
            logger.info("为了保持测试数据的干净，这里选择回滚,不写入mysql,请观察日志，回滚完成");

            sqlSession.close();
            logger.info("sqlSession close successfully ");
        }
    }

日志

代码语言：javascript复制
2018-04-16 00:56:01,547  INFO [main] (BaseMapperTest.java:26) - sessionFactory bulit successfully
2018-04-16 00:56:01,550  INFO [main] (BaseMapperTest.java:29) - reader close successfully
2018-04-16 00:56:01,553  INFO [main] (UserMapperTest.java:320) - deleteSysUserByIdTest
2018-04-16 00:56:01,945 DEBUG [main] (BaseJdbcLogger.java:142) - ==>  Preparing: delete from sys_user where id = ? 
2018-04-16 00:56:02,023 DEBUG [main] (BaseJdbcLogger.java:142) - ==> Parameters: 1(Long)
2018-04-16 00:56:02,029 DEBUG [main] (BaseJdbcLogger.java:142) - <==    Updates: 1
2018-04-16 00:56:02,031 DEBUG [main] (BaseJdbcLogger.java:142) - ==>  Preparing: select a.id, a.user_name, a.user_password, a.user_email, a.user_info, a.head_img, a.create_time from sys_user a where id = ? 
2018-04-16 00:56:02,032 DEBUG [main] (BaseJdbcLogger.java:142) - ==> Parameters: 1(Long)
2018-04-16 00:56:02,055 DEBUG [main] (BaseJdbcLogger.java:142) - <==      Total: 0
2018-04-16 00:56:02,060  INFO [main] (UserMapperTest.java:343) - 为了保持测试数据的干净，这里选择回滚,不写入mysql,请观察日志，回滚完成
2018-04-16 00:56:02,061  INFO [main] (UserMapperTest.java:346) - sqlSession close successfully
单元测试 mybatis xml

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