mysql - 无法让 MySQL 查询工作

Question

我正在尝试在图书馆数据库上创建一个存储过程，主要用于练习。

但这让我有点困惑。我正在使用此查询来创建过程，它说它正在工作，但是当我调用该过程时，它说该过程不存在。注意:我在 Web 数据库上而不是在本地主机上使用 phpmyadmin。

delimiter $$
create procedure BorrowBook(in theBookID, in theUserID)
begin
declare lim int;
declare num int;
declare loanNumber int;
declare copyNumber int;
set lim = (select Readers.Limit from Readers where Readers.id = theUserID);
set num = (select Count(*) from Loans where Loans.UserID = theUserID);
set loanNumber = (select Count(*) from Loans) + 1;
set copyNumber = (select NumberAvailable from Book where Book.id = theBookID);
if(copyNumber > 0)
if(num<lim)
then
--Add a Loan to the Loans Table
insert into Loans values(loanNumber, theBookId, theUserID, curDate(), 0);
commit;
update Book set Book.NumberAvailable = Book.NumberAvailable - 1 where Book.id = theBookID;
select 'Succesful Update';
else
rollback;
select 'Borrow limit reached';
end if;
else
rollback;
select 'No copies available';
end;
delimiter ;

Answer 1

最后一个 end 之后缺少 $$:

delimiter $$
...
end; $$  <-- add $$ here
delimiter ;