Question

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。看看。

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
//

但是在//后输入时出现1064错误。我已经检查了mysql文档，我认为案例语法是正确的。

请帮助。

Answer 1

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 //

Answer 2

该案例必须至少与给定的一个语句匹配，否则您将收到此错误。为避免错误，请在其中包含其他内容。

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; 
else set user_session_id =0; 
end case; 
end

如何在mysql存储过程中使用case-when语句？

2 个答案: