Mysql 动态嵌套游标

作者:chongcilingjian 和数据库相关  

前提:

表一、 ddm_demand

system_id demand_id quotate_end_team
1 1 team1,team5,team2
1 2 tea3,team1,team,4

 

pk:quotate_end_team、demand_id;

表二、 mc_team

team_nam view_order
team1 1
team2 2

 

解决问题:

将表一中的quotate_end_team字段按照表二的view_order重新排序。

 

方法:

 

DELIMITER $$
DROP PROCEDURE IF EXISTS order_team_name $$

CREATE PROCEDURE order_team_name()

BEGIN

declare order_before_teams text ;
declare temp_team_nam text;
declare systemId decimal(10,0) unsigned;
declare demandId char(6);
declare done int;

-- 定义游标1

DECLARE rs_cursor CURSOR FOR SELECT system_id,demand_id,quotate_end_team FROM ddm_demand;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;

open rs_cursor;
 cursor_loop:loop

   FETCH rs_cursor into systemId,demandId,order_before_teams;
  
   if done=1 then
 leave cursor_loop;
   end if;
   if order_before_teams is not null and order_before_teams <> '' then
 SET @sqlstr = concat("where team_nam in ('",replace(order_before_teams,",","','"),"');");
 SET @sqlstr = concat("CREATE VIEW temporary_team_view as SELECT team_nam,view_order FROM mc_team ",@sqlstr);
 -- DROP VIEW IF EXISTS temporary_team_view;
 PREPARE stmt FROM @sqlstr;  
 EXECUTE stmt;

--   调用游标2

 CALL update_ddm_demand(systemId,demandId);
 drop view temporary_team_view;
   end if;

end loop cursor_loop;
close rs_cursor;
END$$


DROP PROCEDURE IF EXISTS update_ddm_demand $$

CREATE PROCEDURE update_ddm_demand(systemId decimal(10,0) unsigned,demandId char(6))

BEGIN
declare temp_team_nam text;
declare order_after_teams text;
declare done int;

-- 定义游标2
DECLARE rs_cursor CURSOR FOR SELECT team_nam FROM temporary_team_view order by view_order;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;
SET order_after_teams = "";
open rs_cursor;
 cursor_loop:loop

   FETCH rs_cursor into temp_team_nam;
  
   if done=1 then
 leave cursor_loop;
   end if;

   -- 更新表
   SET order_after_teams = concat(order_after_teams,",",temp_team_nam);

end loop cursor_loop;

update ddm_demand set quotate_end_team = subString(order_after_teams,2) where system_id = systemId and demand_id = demandId;

close rs_cursor;
END$$

DELIMITER ;

call order_team_name;

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