Mybatis框架-update节点元素的使用

今天我们学习一下mybatis框架中的update节点元素的使用

需求：修改用户表中的一条数据记录，修改编号为21的用户的密码

UserMapper.xml

UserMapper.java

编写测试方法：

 @Test
     public void testUpdate() {
         SqlSession sqlSession = null;
         User user=new User();
         user.setUserPassword("000000");
         user.setId(21);

         int count=0;//返回受影响的行数
         try {
             sqlSession = MyBatisUtil.createSqlSession();
             //调用mapper接口的方式实现
              count= sqlSession.getMapper(UserMapper.class).updateUser(user);
             // int i=1/0;//模拟异常  后台日志打印出rolling back表示没有插入成功，事务进行了回滚
             mlogger.info("返回受影响的行数：" + count);
             sqlSession.commit();//后台日志打印出rolling back表示没有提交事务，事务进行了回滚，所以必须得提交事务才行
         } catch (Exception e) {
             // TODO: handle exception
         } finally {
             // 最后一定要注意：关闭会话
             MyBatisUtil.closeSqlSession(sqlSession);

         }

     }

运行结果：

[DEBUG] 2019-11-05 21:03:24,121 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Opening JDBC Connection
[DEBUG] 2019-11-05 21:03:24,695 org.apache.ibatis.datasource.pooled.PooledDataSource - Created connection 1720854532.
[DEBUG] 2019-11-05 21:03:24,701 cn.smbms.dao.user.UserMapper.updateUser - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@66922804]
[DEBUG] 2019-11-05 21:03:24,703 cn.smbms.dao.user.UserMapper.updateUser - ==>  Preparing: update smbms_user set userPassword =? where id=?
[DEBUG] 2019-11-05 21:03:25,084 cn.smbms.dao.user.UserMapper.updateUser - ==> Parameters: 000000(String), 21(Integer)
[INFO] 2019-11-05 21:03:25,087 cn.smbms.dao.test.UserMapperTest - 返回受影响的行数：1
[DEBUG] 2019-11-05 21:03:25,088 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@66922804]
[DEBUG] 2019-11-05 21:03:25,093 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@66922804]
[DEBUG] 2019-11-05 21:03:25,095 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@66922804]
[DEBUG] 2019-11-05 21:03:25,097 org.apache.ibatis.datasource.pooled.PooledDataSource - Returned connection 1720854532 to pool.

数据库查询结果：