Question

我正在尝试编写一个存储过程，其中我使用2个表根据条件来获取数据，但是它给出了错误。

我的SP是：

DELIMITER //
CREATE PROCEDURE select_notifications(IN datePosted DATETIME,IN recipientId INT,IN packageId INT,IN accountId INT)
BEGIN
 IF datePosted < NOW() THEN
  SELECT tn.subject_line,tn.message,tn.message_type FROM track_notifications AS tn WHERE tn.package_id=packageId AND tn.recipient_id=recipientId AND tn.account_id=accountId AND tn.date_posted = datePosted;
 ELSE IF datePosted > NOW()
  SELECT subject_line,message,message_type FROM track_notifications_new WHERE package_id=packageId AND recipient_id=recipientId AND account_id=accountId AND date_posted = datePosted;
 END IF;
END
END //

Mysql错误：

以下查询失败：“ CREATE DEFINER = root @ localhost 程序select_track_notifications（在datePosted日期，IN recipientId INT，IN packageId INT，IN accountId INT）不如果日期已发布，则包含确定性SQL SQL安全定义程序 NOW（）然后选择tn.subject_line，tn.message，tn.message_type FROM track_notifications AS tn在哪里tn.package_id = packageId和 tn.recipient_id = recipientId和tn.account_id = accountId和 tn.date_posted = datePosted;如果日期已发布>现在（）然后选择 subject_line，message，message_type FROM track_notifications_new在哪里 package_id = packageId和收件人_id =收件人ID和 account_id = accountId AND date_posted = datePosted;万一; END”

MySQL说：

有帮助吗？谢谢。

Answer 1

声明结尾处还有一个END。
此外，您最后需要将定界符重置为;。
否则语法为ELSEIF .... THEN（ELSE和IF之间没有空格）。
此外，我认为您可能需要使用SELECT .. INTO子句将选择查询的结果存储到变量中（您将对其进行进一步的操作）。

请尝试以下操作：

DELIMITER //
DROP PROCEDURE IF EXISTS select_notifications //
CREATE PROCEDURE select_notifications(IN datePosted DATETIME,
                                      IN recipientId INT,
                                      IN packageId INT,
                                      IN accountId INT)
BEGIN
 IF datePosted < NOW() THEN
  SELECT tn.subject_line,
         tn.message,
         tn.message_type 
  FROM track_notifications AS tn 
  WHERE tn.package_id=packageId AND 
        tn.recipient_id=recipientId AND 
        tn.account_id=accountId AND 
        tn.date_posted = datePosted;

 ELSEIF datePosted > NOW() THEN 
  SELECT subject_line,
         message,
         message_type 
  FROM track_notifications_new 
  WHERE package_id=packageId AND 
        recipient_id=recipientId AND 
        account_id=accountId AND 
        date_posted = datePosted;
 END IF;
END //

DELIMITER ;

我可以在单个存储过程中使用2个表吗？

1 个答案: