call getPictureList('402880e63789b63a013789b646dc0000',1,5);
set max_sp_recursion_depth=12;


CREATE PROCEDURE getPictureList (IN rootCategoryId varchar(32),IN m INT,IN n INT)
BEGIN
   CREATE TEMPORARY TABLE IF NOT EXISTS tempCategoryList
   (sno int primary key auto_increment,
    category_id varchar(32),
    depth int
   );
   DELETE FROM tempCategoryList;

   CALL getCategoryList(rootCategoryId,0);
   
   set  @query=concat(
	   ' select p.*',
	   ' from tempCategoryList t,picture p,picture_category pc ',
	   ' where t.category_id = pc.category_id and pc.pic_id = p.pid ', 
	   ' order by p.hot_value desc  limit ',m,',',n);
   
   select @query;
   
   prepare stmt1 from @query;
   execute stmt1;
   deallocate prepare stmt1;  

END;

CREATE PROCEDURE getCategoryList (IN rootCategoryId varchar(32),IN nDepth INT)
BEGIN
      DECLARE done varchar(32) DEFAULT "";
      DECLARE b varchar(32);
      DECLARE cur1 CURSOR FOR SELECT category_id FROM category where parent=rootCategoryId;
      DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
    
      insert into tempCategoryList values (null,rootCategoryId,nDepth);
    
      OPEN cur1;
    
      FETCH cur1 INTO b;
      WHILE done="" DO
              CALL getCategoryList(b,nDepth+1);
              FETCH cur1 INTO b;
      END WHILE;
    
      CLOSE cur1;
END;