mysql if 用法 多个条件判断、字符串比较

use industry_finance;
DELIMITER //
drop procedure if exists updateCursor //
CREATE PROCEDURE updateCursor()
BEGIN
declare id varchar(20);
declare month varchar(20);
declare season varchar(20);
declare cur1 CURSOR FOR SELECT ID_,month_ FROM t_industry_finance_instance;
OPEN cur1;
FETCH cur1 INTO id,month;
WHILE (id is not null ) DO
if(month='01'||month='02'||month='03') THEN set season='1';
end if;
if(month='04'||month='05'||month='06') THEN set season='2';
end if;
if(month='07'||month='08'||month='09') THEN set season='3';
end if;
if(month='10'||month='11'||month='12') THEN set season='4';
end if;
update t_industry_finance_instance set season_=season where ID_=id;
FETCH cur1 INTO id,month;
END WHILE;
CLOSE cur1;
END;//
DELIMITER ;
call updateCursor();