MySQL：如何调用只有输出参数的存储过程？

Question

From my instruction book, I created the following procedure in which the INSERT statement will yield an error:

create procedure f1
(out error char(5))
begin
declare continue handler for SQLSTATE '23000'
set error='23000';
set error ='00000';
insert into teams values(2,27,'derde');
end;

However, it doesn't say how to call this procedure. I tried

call f1;

call f1();

call f1(error);

but none of these works.

Thanks!

Answer 1

You must change your stored procedure if you want to view the error values as a result. The SP like

**SELECT error**

and Please try to call procedure like

**CALL f1(@error)
SELECT @error**

Answer 2

some_variable = call f1(); It will work

Answer 3

Try the following: CALL f1(); .