ibatis 返回list----resultClass="hashMap" 可以实现

       select  a.id as id,

                     count(distinct b.id) as bid,

                    count(distinct c.id) as cid

     from  user a left join user_role b  on a.userId = b.userId

     left join role c on b.roleId = c.roleId;

要求返回结果形式为：List

       String [ ] 中存放的就是三个ID值.

1.到这里，通常我的想法就是，写一个javaBean,javaBean中有这三个属性，分别和这三个值相对应，然后通过resultMap来映射结果集，

如：

  
  
  

      select  a.id as id,

                     count(distinct b.id) as bid,

                    count(distinct c.id) as cid

     from  user a left join user_role b  on a.userId = b.userId

     left join role c on b.roleId = c.roleId;

 

List list = sqlMapClient.queryForList("selectId");

然后再循环迭代list集合转换为String[ ]数组，然后在放入list，最后返回。

2.   实际上是陷入了惯性思维，老是想着用resultMap,其实这里直接用resultClass="hashMap" 可以实现

就不用写javaBean了。

 如下：

      select  a.id as id,

                     count(distinct b.id) as bid,

                    count(distinct c.id) as cid

     from  user a left join user_role b  on a.userId = b.userId

     left join role c on b.roleId = c.roleId;

 

List   result= sqlMapClient.queryForList("selectId");

Map hashMap  = new HashMap();
   for(int i=0;i     hashMap = (HashMap)result.get(i);
    String[] areaElement = new String[3];
    areaElement[0] = hashMap.get("AID").toString();

    areaElement[2] = hashMap.get("BID").toString();
    areaElement[3] = hashMap.get("CID").toString();

    statResult.add(areaElement);
   }

注意：这里的hashMap.get("AID")，键名的来源就是sql语句中的别名。