MySQL的DECLARE語法（從MSSQL轉換）

Question

MySQL的大師，

我把一些報告，從MSSQL數據庫的使用在一個MySQL數據庫，似乎不懂得如何在MySQL中DECLARE作品。以下是報告的SQL代碼，與MSSQL中的一樣。我讀DECLARE只能用於嵌套函數，我相信，但這聽起來不正確。

當前報表SQL：（我解析&從我的應用程序代碼替換當前&待定的值）

DECLARE @Current int; 
DECLARE @Pending int; 

SET @Current = [1]; 
SET @Pending = [3]; 

Select Ticket.TIcketID, 
ISNULL((Select LocationName from Location where LocationID = Ticket.SiteCurrentLocation), 'Invalid Location') as [Current Location], 
ISNULL((Select LocationName from Location where LocationID = Ticket.SitePendingLocation), 'Invalid Location') as [Pending Location] 
from Ticket 

where 
(SitePendingLocation > 0 AND SitePendingLocation <> SiteCurrentLocation) AND 
(SiteCurrentLocation = @Current OR @Current = 0) AND 
(SitePendingLocation = @Pending OR @Current = 0) 

任何見解？

謝謝 - 安德魯

編輯

工作，轉換腳本 - 它可以幫助別人：

SET @Current = '1'; 
SET @Pending = '1'; 

Select Ticket.TIcketID, 
IFNULL((Select LocationName from Location where LocationID = Ticket.SiteCurrentLocation), 'Invalid Location') as `Current Location`, 
IFNULL((Select LocationName from Location where LocationID = Ticket.SitePendingLocation), 'Invalid Location') as `Pending Location` 
from Ticket 

where 
(SitePendingLocation > 0 AND SitePendingLocation <> SiteCurrentLocation) AND 
(SiteCurrentLocation = @Current OR @Current = 0) AND 
(SitePendingLocation = @Pending OR @Current = 0) 

Answer 1

您可以使用本身（無DECLARE）設定或替換@與_或類似（甚至沒有前綴）。

我一般前綴礦用_

了類似的問題

至於你的其他評論見What's wrong with this MySQL statement: DECLARE @ID INT，這是IFNULL在MySQL的 - 見http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html#function_ifnull

它總是小事情...： - ）