mybatis返回类型map时如何将key大写转为小写

SELECT DEPTNO as "deptno" ,DEPTNAME,DEPTGRADE,PARENTDEPT

       FROM VMGR_DEPT

       ORDER BY DEPTGRADE,DEPTNO

< select id= "selectBlogRetHashMap" parameterType= "int" resultType= "map" > 

       SELECT id AS "id" , title AS "title" , content AS "content" FROM Blog WHERE id = #{id} 

   </ select >

public class Snippet {

     public static Map<String, Object> transformUpperCase(Map<String, Object> orgMap) {

         Map<String, Object> resultMap = new HashMap<>();

         if (orgMap == null || orgMap.isEmpty()) {

             return resultMap;

         }

         Set<String> keySet = orgMap.keySet();

         for (String key : keySet) {

             String newKey = key.toLowerCase();

             newKey = newKey.replace( "_" , "" );

             resultMap.put(newKey, orgMap.get(key));

         }

         return resultMap;

     }

}

user_id as [userId]

< select id= "queryMaxPriceAAndUser" parameterType= "java.lang.String" resultType= "java.util.HashMap" >

     SELECT A.SELL_PRICE as "price" , B.USER_ID as "userId"

       FROM QLYY_SELL_AUCTION_RECORD A, QLYY_SELL_APPLY B

      WHERE A.SELL_PRICE = ( SELECT MAX (SELL_PRICE)

                              FROM QLYY_SELL_AUCTION_RECORD

                             WHERE SELL_PROGRAM_ID = #{programId})

        AND A.SELL_PROGRAM_ID = #{programId}

        AND B.APPLY_CODE = A.SELL_USER

   </ select >