哪里错了？

-1

请帮我找到我犯错的地方吗？哪里错了？

delimiter // 
CREATE FUNCTION `count_photos_in_gallery`(`tmp_gallery_id` INT(11) NOT NULL) RETURNS TINYINT(3) UNSIGNED 
BEGIN 
    DECLARE `tmp_count` TINYINT(3) UNSIGNED DEFAULT 0; 

    SELECT COUNT(`id`) INTO `tmp_count` FROM `photos_items` WHERE `gallery_id`=`tmp_gallery_id` LIMIT 1; 

    RETURN `tmp_count`; 
END//

错误：

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 'NOT NULL) RETURNS TINYINT(3) UNSIGNED BEGIN DECLARE tmp_count TINYINT(3) UNSI' at line 1

来源

2012-03-28 marverix

那么，我们如何才能发现其中的错误如果我们不知道问题是什么？ – 2012-03-28 07:28:23

你为什么认为有错误？你得到的错误是什么？ – Gavriel 2012-03-28 07:28:51

定义READS SQL DATA后返回语句 – silly 2012-03-28 07:30:13

变化的函数声明，参数不能有NOT NULL选项 -

... 
CREATE FUNCTION `count_photos_in_gallery`(`tmp_gallery_id` INT(11)) 
    RETURNS TINYINT(3) UNSIGNED 
...

来源

2012-03-28 07:38:07 Devart

好吧，我想通了，但告诉我为什么？ – marverix 2012-03-28 07:39:49

'NULL'和'NOT NULL'是列定义属性（来自CREATE TABLE或ALTER TABLE语句）。 CREATE FUCTION语法不允许它。 – Devart 2012-03-28 07:52:42

@marverix你为什么需要它不是null？ – 2012-03-28 07:59:43

尝试这个

DELIMITER // 
CREATE FUNCTION `count_photos_in_gallery`(`tmp_gallery_id` INT(11)) RETURNS TINYINT(3) UNSIGNED 
BEGIN 
    DECLARE `tmp_count` TINYINT(3) UNSIGNED DEFAULT 0; 

    SELECT COUNT(`id`) INTO `tmp_count` FROM `photos_items` WHERE `gallery_id`=`tmp_gallery_id` LIMIT 1; 

    RETURN `tmp_count`; 
END//

来源

2012-03-28 07:44:21 neeraj

回答

相关问题