mapper文件一次空指针异常记录

     一个简单的查询，mapper文件的配置如下：

<select id="querySupplierAndDriverId" resultType="com.zhuanche.entity.mdbcarmanage.DriverInfoInterCity">
  select  driver_id ,city_id ,supplier_id  
  from driver_info_inter_city
  where driver_id IN
  <foreach collection="driverIds" open="(" close=")" separator="," item="driverId" >
    #{driverId}
  </foreach>
  AND  status = 1
</select>

结果在使用的时候，一直报空指针异常。但是看了下数据库里面也能查询到数据，怎么就空指针了呢？

 最后想了下，是这个查询 的结果和resultType的字段没有匹配一块导致的，没有查询出来，按照我的理解，应该是会new 一个对象的，但是应该是没有。先把问题改了

  <select id="querySupplierAndDriverId" resultType="com.zhuanche.entity.mdbcarmanage.DriverInfoInterCity">
    select  driver_id as driverId,city_id as cityId,supplier_id as supplierId
    from driver_info_inter_city
    where driver_id IN
    <foreach collection="driverIds" open="(" close=")" separator="," item="driverId" >
      #{driverId}
    </foreach>
    AND  status = 1
  </select>

有空研究下源码

标签：mapper,记录,driverId,driver,查询,city,id,指针
来源： https://www.cnblogs.com/thinkingandworkinghard/p/12119732.html