無法創建函數MySQL錯誤1064（42000）

Question

嗨，我是使用MySQL創建一個函數：

CREATE FUNCTION INSERTGROUP(name VARCHAR(50)) 
RETURNS INT 
NOT DETERMINISTIC 
BEGIN 
DECLARE 'idGroup' INT; 

IF (NOT EXISTS (SELECT groupID FROM groupsTable WHERE groupName = 'name')) 
THEN INSERT INTO groupsTable (groupName) VALUES ('name'); 

SELECT groupID INTO 'idGroup' FROM groupsTable WHERE groupName='name'; 

RETURN 'idGroup'; 
END// 

但是當我嘗試創建它，我得到這個錯誤：

ERROR 1064 (42000): 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 
''idGroup' INT; 

IF (NOT EXISTS (SELECT groupID FROM serverGroupsTable WHERE gro' at line 5 

我已經通過論壇和其他類似的問題，但我不能讓它創建的功能。

我在做什麼錯了？語法是否正確？我需要添加其他東西嗎？

確定這就是我嘗試：

CREATE FUNCTION INSERTGROUP(name VARCHAR(255)) 
RETURNS INT 
NOT DETERMINISTIC 
BEGIN 
DECLARE idGroup INT; 

IF (NOT EXISTS (SELECT groupID FROM groupsTable WHERE groupName = name)) 
THEN INSERT INTO groupsTable (groupName) VALUES (name); 

SELECT groupID INTO idGroup FROM groupsTable WHERE groupName=name; 

RETURN idGroup; 
END// 

和

CREATE FUNCTION INSERTGROUP(name VARCHAR(255)) 
RETURNS INT 
NOT DETERMINISTIC 
BEGIN 
DECLARE idGroup INT; 

IF (NOT EXISTS (SELECT groupID FROM groupsTable WHERE groupName = 'name')) 
THEN INSERT INTO groupsTable (groupName) VALUES ('name'); 

SELECT groupID INTO idGroup FROM groupsTable WHERE groupName='name'; 

RETURN idGroup; 
END// 

，並在過去兩年我得到這個錯誤：

ERROR 1064 (42000): 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 13 

類似於上面的一個

另外我做DELIMITER //將其從;

Answer 1

改變從聲明

DECLARE idGroup INT; 

刪除引號，你忘了在功能

delimiter // 
CREATE FUNCTION INSERTGROUP(name VARCHAR(255)) 

開始定界符變化，你忘了結束您if聲明

end if; 

無論你想要它結束