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

    /*** * * @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

<!-- 根据id更改SysUser --><update id="updateSysUserById">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}</update>

单元测试

@Testpublic void updateSysUserByIdTest() {logger.info("updateSysUserByIdTest");// 获取SqlSessionSqlSession sqlSession = getSqlSession();try {// 获取UserMapper接口UserMapper userMapper = sqlSession.getMapper(UserMapper.class);// 先根据ID查询出对应的sysuserSysUser sysUser = userMapper.selectSysUserById((long) 1);// 当前数据库用户的userName期望为adminAssert.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1Assert.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adminUpdatedAssert.assertEquals("adminUpdated", sysUser.getUserName());// 期望的邮箱为updateSysUser@artisan.comAssert.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

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, <<BLOB>>, <<BLOB>>, 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

/*** * * @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

<!-- 根据ID删除用户 --><delete id="deleteSysUserById">delete from sys_user where id = #{id}</delete>

单元测试

@Testpublic void deleteSysUserByIdTest() {logger.info("deleteSysUserByIdTest");// 获取SqlSessionSqlSession 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 1Assert.assertEquals(1, result);// 再次查询SysUser sysUser = userMapper.selectSysUserById((long) 1);// 期望查询出来的sysUser 为 nullAssert.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

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

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MyBatis-05 MyBatis XML方式之update/delete元素

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

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