找到分隔符问题。

Question

我在一个名为fouras的MySQL数据库中有一个表名：

mysql> desc offer;
+------------------------+---------------+------+-----+---------+----------------+
| Field                  | Type          | Null | Key | Default | Extra          |
+------------------------+---------------+------+-----+---------+----------------+
| id                     | bigint(20)    | NO   | PRI | NULL    | auto_increment |
| description            | varchar(5000) | NO   |     | NULL    |                |
| end_date               | date          | NO   |     | NULL    |                |
| is_accepted            | bit(1)        | NO   |     | NULL    |                |
| is_active              | bit(1)        | NO   |     | NULL    |                |
| is_draft               | bit(1)        | NO   |     | NULL    |                |
| is_processed           | bit(1)        | NO   |     | NULL    |                |
| is_removed             | bit(1)        | NO   |     | NULL    |                |
| max_reservation_number | int(11)       | NO   |     | NULL    |                |
| promotion_first_param  | varchar(255)  | YES  |     | NULL    |                |
| promotion_product      | varchar(255)  | YES  |     | NULL    |                |
| promotion_second_param | varchar(255)  | YES  |     | NULL    |                |
| promotion_type         | varchar(255)  | NO   |     | NULL    |                |
| publish_date           | date          | YES  |     | NULL    |                |
| remove_time_stamp      | bigint(20)    | YES  |     | NULL    |                |
| start_date             | date          | NO   |     | NULL    |                |
| title                  | varchar(255)  | NO   |     | NULL    |                |
| views_number           | int(11)       | YES  |     | NULL    |                |
| local_business         | bigint(20)    | YES  | MUL | NULL    |                |
+------------------------+---------------+------+-----+---------+----------------+
19 rows in set (0.00 sec)

现在，我想定期检查优惠是否已过期（今天是end_date＆gt;），因为我正在尝试使用MySQL预定活动：

CREATE EVENT IF NOT EXISTS check_expired_offers
    ON SCHEDULE EVERY 10 MINUTE
    DO
        BEGIN
            DECLARE id INT;
            DECLARE end_date DATE;
            DECLARE offer_cursor CURSOR FOR SELECT id, end_date FROM fouras.offer;

            OPEN offer_sursor;
            offer_loop: LOOP
                FETCH offer_cursor into id, end_date;
                IF end_date < NOW() THEN 
                    UPDATE fouras.offer set is_active = false;  
                END IF;

            END LOOP
END;

但是当我尝试添加此事件时，MySQL会抛出错误：

Error Code: 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    0,127 sec

Answer 1

错误是关于分隔符的，tutorial给了我很多帮助

Answer 2

==========================

找到分隔符问题。

==========================

以下是修改后的event：

delimiter $$
CREATE EVENT IF NOT EXISTS check_expired_offers
    ON SCHEDULE EVERY 10 MINUTE
    DO
        BEGIN
            DECLARE finished INTEGER DEFAULT 0;
            DECLARE id INT;
            DECLARE end_date DATE;
            DECLARE offer_cursor CURSOR FOR SELECT id, end_date FROM fouras.offer;
                        DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;

            OPEN offer_cursor;
            offer_loop: 
                        LOOP
                FETCH offer_cursor into id, end_date;
                IF finished = 1 THEN 
                                    LEAVE offer_loop;
                                END IF;
                                IF end_date < NOW() THEN 
                    UPDATE fouras.offer set is_active = false;  
                END IF;

            END LOOP ;
END $$
delimiter;

How to detect call incoming programmatically

注意：我还使用了一个名为finished的变量。

其中，finish是一个变量，表示光标已到达结果集的末尾。请注意，处理程序声明必须出现在存储程序中的变量和游标声明之后。

下图说明了MySQL游标的工作原理。

Learn delimiters in MySQL

在MySQL中创建预定事件

2 个答案:

找到分隔符问题。