如何在MySQL存储过程中使用case-when语句? [英] How to use a case-when statement in a mysql stored procedure?

问题描述

我想使用request_time参数自动设置session_id，所以我选择了一个包含case语句的mysql存储过程.

I want to set the session_id automatically using the request_time parameter so i opted for a mysql stored procedure that contains a case statement.Here goes.

create procedure upd_userinput(in  request_time timestamp, out user_session_id int) 

begin 

update user_input;

case request_time

when time(request_time) < '9:15:00' && time(request_time) > '8:15:00' 
then set user_session_id = 1; 

when  time(request_time)< '10:15:00' && time(request_time) > '11:15:00' 
then set user_session_id =2; 

end case; 
end
//

但是我在//之后输入时出现1064错误.我检查了mysql文档，认为大小写正确.

However i get a 1064 error on enter after //. I have checked the mysql documentation i think the case syntax is correct.

请帮助.

推荐答案

delimiter //

create procedure upd_userinput(in request_time TIMESTAMP,out time TIME, out user_session_id INT)     

begin      

set time = time(request_time);    

case  
when time < '09:15:00' && time > '08:15:00' then      
set user_session_id = 1; 

when time < '10:15:00' && time > '11:15:00' then
set user_session_id = 2;  

else set user_session_id =3;

end case;  
end //

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