MySQL 有输入输出参数的存储过程实例

1.MySQL 有输入输出参数的存储过程实例

DELIMITER //
DROP PROCEDURE IF EXISTS `test`.`p_getvalue` // 
CREATE PROCEDURE `p_getvalue`(
in id varchar(),out s varchar()
)
begin
if (length(id)=) then select 'A_B_C_D' into s;
elseif(length(id)=) then select 'A_B_C' into s;
elseif(length(id)=) then select 'A_B' into s;
elseif(length(id)=) then select 'A' into s;
end if;
select s;
end //
DELIMITER ; 

2.执行程序

CALL p_getvalue('',@S) 

3、结果
'A_B_C'