Mybatis使用in传入List的三种方法

1.非xml方式，使用注解传in，要使用

@Select("<script>" +
            "SELECT count(DISTINCT member_id) as memberCount
" +
            "from member_analysis
" +
            "WHERE agent_id in <foreach item=item index=index collection=memberIds open=( separator=, close=)>" +
            "#{item}" +
            "</foreach>" +
            "</script>")
Integer getCountWithAgentId(@Param("memberIds") List<String> memberIds);

其中的foreach的collection直接写成@param中的值即可。

2.在入参前进行字符串封装,拼成(,,,,)传值

@Select("SELECT count(DISTINCT member_id) as memberCount from member_analysis where access_pat_id in (#{memberIds})")
    Integer getCountWithAgentId(@Param("memberIds")String memberIds);

使用方法返回

public static String indexForm(List<String> s){
          
   
        String content="";
        int i=0;
        for (String ss:s){
          
   
            i++;
            if (i==s.size()){
          
   
                content+=ss;
            }else {
          
   
                content+=ss+",";
            }
        }
        return content;
    }

或者使用

StringUtils.join(memberIds.toArray(),",")

3.正常流程的xml方法

<select id="findByIds" resultMap="BaseResultMap">
        select * from dictionaries
        <where>
            dictionaries.key  in 
            <foreach  item="item" index="index" collection="memberTypes" open="(" separator="," close=" )">
                 #{
          
   item}
        	</foreach>
        </where>
    </select>