mysql if 相等_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();