mybatis 记录

删除list集合 

 **Mapper.xml

　　<delete id="deleteBackstageRecommend" parameterType="java.util.List">
        delete from backPersonConfig
        where (agentCode,guaranteeType) in
        <foreach collection="list" item="item" index="index" separator="," open="(" close=")">
            (#{item.agentCode},#{item.guaranteeType})
        </foreach>
   </delete>

**Mapper

 /**
     * 删除推荐产品
     * @param backPersonConfig
     */
    public void deleteBackstageRecommend(List<BackPersonConfig> backPersonConfig);

　　

将多条记录合并为一条展示所有数据

mysql:  使用group_concat

select sales_code,count( distinct stat_month) as a ,
group_concat( item_id order by sales_code desc separator ',') ,
group_concat( index_name order by sales_code desc separator ',')
from t_saleswageinfo
where 1=1
group by sales_code

oracle: 使用 listagg ... within group

 select * from (select sales_code, listagg(to_char(item_id), ',') 
within group(order by sales_code) indexId 
 ,listagg(to_char(index_name), ',') within group(order by sales_code)indexName 
from t_salesWageInfo 
group by sales_code) a