Mysql动态嵌套游标 - mysql数据库栏目 - 自学php

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;

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;

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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