### Cause: java.lang.reflect.UndeclaredThrowableException

### Cause: java.lang.reflect.UndeclaredThrowableException

Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.reflect.UndeclaredThrowableException
### The error may exist in file [E:\codeBase\top713\superrescue-service\target\classes\mybatis\qc\TechserviceEffiserviceEntityMapper.xml]
### The error may involve com.jn.ssr.superrescue.web.serviceEffi.dao.TechserviceEffiserviceEntityMapper.findTechEffi
### The error occurred while executing a query

Caused by: net.sf.jsqlparser.parser.ParseException: Encountered " "(" "( "" at line , column .
Was expecting one of:
<EOF>
"AS" ...
"DO" ...
"ANY" ...
"KEY" ...
"PERCENT" ...
"END" ...

mybatis的错误，将sql放在Navicat中执行都可以

然后在<select></select>中写一个简单sql，发起情求，sql可以执行，说明mapper映射与resultMap还有parmaterType等没有错误

将sql的字段一个一个的字段进行删除然后执行，判断是哪个字段出错，最后找出是

SUM(o.service_type!='TC') AS repair_number,

这个字段，仿佛是mybatis不支持 SUM(列名)的格式

最后将这个字段修改为：

  (select count(service_type) from or_rescue_order oro where service_type!="TC" and o.id = oro.id) AS repair_number,

就可以了