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