Wings丶
2018-03-14 20:34
Caused by: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'org.libM.dao.bookDao.getImage'. It's likely that neither a Result Type nor a Result Map was specified.
单列数据的类型是String ,不是不用配置吗?我如果配置成实体类的话,它不就是返回一个封装的实体类?我不需要别的呀
需要配置resultType类型的。
String findNameById(@Param("seckillId") String seckillId);
<select id="findNameById" resultType="String"> SELECT s.name FROM seckill s WHERE s.seckill_id = #{seckillId} </select>
@Test public void testFindNameById() { String id = "c18c12a838c311e89fa754ee75c6aeb0"; String name = seckillMapper.findNameById(id); log.info("name:{}", name); }
执行结果:INFO cn.colg.dao.SeckillMapperTest - name:1000元秒杀iphone6
Java高并发秒杀API之业务分析与DAO层
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