Mysql动态嵌套游标_MySQL

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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 <> &＃39;&＃39; then
SET @sqlstr = concat("where team_nam in (&＃39;",replace(order_before_teams,"，","&＃39;,&＃39;"),"&＃39;);");
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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