问题
I tried this example via phpMyAdmin http://www.databasejournal.com/features/mysql/article.php/3569846/MySQL-Stored-Functions.htm
mysql> DELIMITER |
mysql>
CREATE FUNCTION WEIGHTED_AVERAGE (n1 INT, n2 INT, n3 INT, n4 INT)
RETURNS INT
DETERMINISTIC
BEGIN
DECLARE avg INT;
SET avg = (n1+n2+n3*2+n4*4)/8;
RETURN avg;
END|
This worked
DELIMITER |
The next statement gave:
Error
SQL query:
CREATE FUNCTION WEIGHTED_AVERAGE(
n1 INT,
n2 INT,
n3 INT,
n4 INT
) RETURNS INT DETERMINISTIC BEGIN DECLARE avg INT;
MySQL said: Documentation
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 5
回答1:
As it is mentioned in the link:
As mentioned in the first stored procedures tutorial, we declare the "|" symbol as a delimiter, so that our function body can use ordinary ";" characters
You can write a lot of commands on different consecutive lines. But usually only when ';' is met, the hole statement is executed.
Putting a DELIMITER character means that MySQL should wait until this is closed no matter if you use ';' or not and only then to interpret what is between delimiters.
来源:https://stackoverflow.com/questions/3831077/creating-functions-in-mysql-doesnt-work-error-1064