MyBatis查询返回的map类型数据如何获取？

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java// MyBatis DAO层方法public List

// MyBatis SQL片段SELECT t.item_id AS itemId, SUM(t.quantity) AS saleNumFROM order tWHERE t.order_status=1GROUP BY t.item

mybatis

//DAO层返回的结果为list public List > queryItemSaleCountBatch() { return selectList("selectByField"); } //mybatis片段 select t.item_id as itemId, sum(t.`quantity`) as saleNum from order t where t.order_status = 1 group by t.item_id