Question

您好我正在使用MySQL创建一个函数：

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//

但是当我尝试创建它时出现此错误：

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

我经历过与此类似的论坛和其他问题，但我无法创建该功能。

我做错了什么？语法是否正确？我需要添加其他内容吗？

好的，这就是我的尝试：

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//

最后两个我得到了这个错误：

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

与上面的相似

我也DELIMITER //从;

更改它

Answer 1

从声明中删除引号

DECLARE idGroup INT;

你忘记了函数开头的分隔符更改

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

您忘了结束if声明

end if;

无论你希望它结束

无法在MYSQL错误1064（42000）中创建功能

1 个答案: