这个就也比较简单，需求：将我们最新插入的那条数据删除掉，从用户表中。
UserMapper.xml
UserMapper.java
编写测试方法：
1 @Test 2 public void testDelete() { 3 SqlSession sqlSession = null; 4 Integer id=21; 5 int count=0;//返回受影响的行数 6 try { 7 sqlSession = MyBatisUtil.createSqlSession(); 8 //调用mapper接口的方式实现 9 count= sqlSession.getMapper(UserMapper.class).deleteUser(id); 10 // 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 11 mlogger.info("返回受影响的行数：" + count); 12 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 13 } catch (Exception e) { 14 // TODO: handle exception 15 } finally { 16 // 最后一定要注意：关闭会话 17 MyBatisUtil.closeSqlSession(sqlSession); 18 19 } 20 21 }
运行结果：
1 [DEBUG] 2019-11-05 21:47:04,506 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Opening JDBC Connection 2 [DEBUG] 2019-11-05 21:47:04,799 org.apache.ibatis.datasource.pooled.PooledDataSource - Created connection 176065613. 3 [DEBUG] 2019-11-05 21:47:04,802 cn.smbms.dao.user.UserMapper.deleteUser - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@a7e8c4d] 4 [DEBUG] 2019-11-05 21:47:04,803 cn.smbms.dao.user.UserMapper.deleteUser - ==> Preparing: delete from smbms_user where id=? 5 [DEBUG] 2019-11-05 21:47:04,899 cn.smbms.dao.user.UserMapper.deleteUser - ==> Parameters: 21(Integer) 6 [INFO] 2019-11-05 21:47:04,902 cn.smbms.dao.test.UserMapperTest - 返回受影响的行数：1 7 [DEBUG] 2019-11-05 21:47:04,903 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@a7e8c4d] 8 [DEBUG] 2019-11-05 21:47:04,907 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@a7e8c4d] 9 [DEBUG] 2019-11-05 21:47:04,908 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@a7e8c4d] 10 [DEBUG] 2019-11-05 21:47:04,909 org.apache.ibatis.datasource.pooled.PooledDataSource - Returned connection 176065613 to pool.