1
我的文件夾這樣的結構:實體框架自參照實體刪除
Folder1
Folder1.1
Folder1.2
Folder2
Folder2.1
Folder2.1.1
and so on..
的問題是如何級聯刪除它們(即當刪除文件夾2所有的孩子也被刪除。)。我無法設置ON DELETE操作,因爲MSSQL不允許它。你能提出一些建議嗎?
更新:我寫了這個存儲過程,我可以離開它還是需要一些修改?
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE sp_DeleteFoldersRecursive
@parent_folder_id int
AS
BEGIN
SET NOCOUNT ON;
IF @parent_folder_id = 0 RETURN;
CREATE TABLE #temp(fid INT);
DECLARE @Count INT;
INSERT INTO #temp(fid)
SELECT FolderId FROM Folders WHERE FolderId = @parent_folder_id;
SET @Count = @@ROWCOUNT;
WHILE @Count > 0
BEGIN
INSERT INTO #temp(fid)
SELECT FolderId FROM Folders WHERE EXISTS
(SELECT FolderId FROM #temp
WHERE Folders.ParentId = #temp.fid)
AND NOT EXISTS
(SELECT FolderId FROM #temp
WHERE Folders.FolderId = #temp.fid);
SET @Count = @@ROWCOUNT;
END
DELETE Folders FROM Folders INNER JOIN #temp ON Folders.FolderId = #temp.fid;
DROP TABLE #temp;
END
GO