后台传List参数，mybatis接收遍历处理demo

1.mapperExt.java中定义的方法：

List countByTypeUserIdList(@Param(value = "caseId") Long caseId,
        @Param(value = "list") List userIdList,
        @Param(value = "refId") Long refId, @Param(value = "type") String type);

2.mapperExt.xml中对应的方法：

    select type,
            refid ,
            count(distinct case when user_id in
            
               #{userid}
            
            then concat(type,refid,user_id) end) as iAnswerCount, 
            count(distinct case when user_id not in
             
               #{userid}
            
             then concat(type,refid,user_id) end) as otherAnswerCount 
    from lassen_evidence_oppugn
    where case_id = #{caseId}
      and is_deleted = 'n'
     
      and refid = #{refId}
     
     
      and type = #{type}
     
    group by type, refid