使用 Toad 的无效脚本错误

Question

我正在尝试为存储过程开发 SQL 语句，该语句将为我提供一些我将使用变量 (@repeated) 指定的计数。

我正在使用 Toad for MySQL，但我不断收到语法错误（描述性不强）。这是我的 SQL：

DECLARE @repeated INT DEFAULT 1;
DECLARE @mailingmonth DATE;

SET @mailingmonth = '2015-10-01';

WHILE @repeated < 12 DO
SELECT A.LoanNumber, Repeated FROM MKT_Mailing_Hist A 
 INNER JOIN (SELECT LoanNumber, COUNT(*) As Repeated
             FROM MKT_Mailing_Hist B
             WHERE MailingMonth <= @mailingmonth
             GROUP BY LoanNumber) AS Months ON A.LoanNumber = Months.LoanNumber
 WHERE A.MailingMonth = @mailingmonth
 AND Repeated = @repeated
 SET @repeated = @repeated + 1;
 END WHILE;
 END;

我认为这种语法可能存在几个问题，但我一直在进行更改，但似乎没有任何效果。

更新

我想将类似的代码封装在带有参数的存储过程中，以便我可以更改参数以满足我的需要。这就是我所拥有的：

DELIMITER $$

CREATE procedure sp_MKT_Counts_Test2 (vRepeated INT, vMailingmonth DATE)
BEGIN

WHILE vRepeated < 12 DO
SELECT COUNT(A.LoanNumber) FROM MKT_Mailing_Hist A 
 INNER JOIN (SELECT LoanNumber, COUNT(*) As Repeated
             FROM MKT_Mailing_Hist B
             WHERE MailingMonth <= vMailingmonth
             GROUP BY LoanNumber) AS Months ON A.LoanNumber = Months.LoanNumber
 WHERE A.MailingMonth = vMailingmonth
 AND Repeated = vRepeated;
 SET vRepeated = vRepeated + 1;
 END WHILE;
  END;
 $$
 DELIMITER ;

但是，当我使用两个参数调用存储过程时，我只收到一条消息，通知我该语句已成功执行，但我没有得到任何结果集。为什么没有结果集？我需要输出参数吗？

Answer 1

这将使您摆脱语法错误：

DELIMITER $$
create procedure myProc876()
BEGIN

DECLARE vRepeated INT DEFAULT 1;
DECLARE vMailingmonth DATE;

SET vMailingmonth = '2015-10-01';

WHILE vRepeated < 12 DO
SELECT A.LoanNumber, Repeated FROM MKT_Mailing_Hist A 
 INNER JOIN (SELECT LoanNumber, COUNT(*) As Repeated
             FROM MKT_Mailing_Hist B
             WHERE MailingMonth <= mailingmonth
             GROUP BY LoanNumber) AS Months ON A.LoanNumber = Months.LoanNumber
 WHERE A.MailingMonth = vMailingmonth
 AND Repeated = vRepeated;
 SET vRepeated = vRepeated + 1;
 END WHILE;
 END;
 $$
 DELIMITER ;

它有一个WHILE DO，更改了一些变量名，并用DELIMITER 包裹。定界符很重要，否则找到的第一个分号就结束了。所以 $$ 包裹了整个事情。然后将用户会话分隔符设置回分号。

请注意，您的 AND Repeated = @repeated 最后也没有半号

Delimiters 对于存储过程和创建事件和触发器很重要。