在 MSSQL 中创建目录并提取其中的 BLOB

Question

我正在尝试将 BLOB 提取到相关目录中的文件中。 这是我的桌子：

执行代码后，它应该在@outPutPath 中为表中的每一行创建所有 3 个文件夹，并在其中创建文件。

我有用于提取文件的工作代码（代码下方），但是当我添加两行额外的行（在@fPath 中添加@folderName）以创建目录时，它不再工作了。可能是目录检查是否存在并创建将是一个好主意，不确定。如果有人可以帮忙吗？

sp_configure 'show advanced options', 1;  
GO  
RECONFIGURE;  
GO  
sp_configure 'Ole Automation Procedures', 1;  
GO  
RECONFIGURE;  
GO
--------------------------------------------------------------------------------------
drop table [dbo].[Document];

CREATE TABLE [dbo].[Document](
    [Doc_Num] [numeric](18, 0) IDENTITY(1,1) NOT NULL,
    [Folder_Name] [varchar](50) NULL,
    [Extension] [varchar](50) NULL,
    [FileName] [varchar](200) NULL,
    [Doc_Content] [varbinary](max) NULL   
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
----------------------------------------------------------------------------------
SET IDENTITY_INSERT [Document] ON
GO

--------------------------------------------------------------------------------------
delete from [dbo].[Document] where Doc_Num in (1,3,4);


Insert into Document (Doc_Num,Folder_Name,Extension,FileName,Doc_Content)
select 2 as Doc_Num,'Test2','JPG' AS Extension,'TestImage.jpg' as FileName,*
from openrowset(bulk 'C:\temp\BICH\TestBLOB\Import\TestImage.jpg', SINGLE_BLOB)
as X
GO
Insert into Document (Doc_Num,Folder_Name,Extension,FileName,Doc_Content)
select 5 as Doc_Num,'Test5','JPG' AS Extension,'Angle2.png' as FileName,*
from openrowset(bulk 'C:\temp\BICH\TestBLOB\Import\Angle2.png', SINGLE_BLOB)
as X
GO
Insert into Document (Doc_Num,Folder_Name,Extension,FileName,Doc_Content)
select 6 as Doc_Num,'Test6','JPG' AS Extension,'iLoveTrD.png' as FileName,*
from openrowset(bulk 'C:\temp\BICH\TestBLOB\Import\iLoveTrD.png', SINGLE_BLOB)
as X
GO

--  select * from [Document]


-------------------------------------------------------------------
DECLARE @outPutPath varchar(50) = 'C:\temp\BICH\TestBLOB\Export'
, @i bigint
, @init int
, @data varbinary(max) 
, @fPath varchar(max)  
, @folderPath  varchar(max)
, @folderName varchar(max)

--Get Data into temp Table variable so that we can iterate over it 
DECLARE @Doctable TABLE (id int identity(1,1), [Doc_Num]  varchar(100) , [Folder_Name] varchar(100) ,
[FileName]  varchar(100), [Doc_Content] varBinary(max) )

INSERT INTO @Doctable([Doc_Num],[Folder_Name],[FileName],[Doc_Content])
Select [Doc_Num],[Folder_Name],[FileName],[Doc_Content] FROM  [dbo].[Document]

SELECT @i = COUNT(1) FROM @Doctable   

WHILE @i >= 1   

BEGIN    

SELECT 
    @data = [Doc_Content],
    @folderName = [Folder_Name],
    @fPath = @outPutPath + '\' + '\' + [Doc_Num] +'_' + [FileName],
--  @fPath = @outPutPath + '\' + @folderName + '\' + [Doc_Num] +'_' + [FileName],
    @folderPath = @outPutPath + '\' + @folderName
    
FROM @Doctable WHERE id = @i

--EXEC master.dbo.xp_create_subdir @folderPath; -- Creating sub-directory
EXEC sp_OACreate 'ADODB.Stream', @init OUTPUT; -- An instace created
EXEC sp_OASetProperty @init, 'Type', 1;  
EXEC sp_OAMethod @init, 'Open'; -- Calling a method
EXEC sp_OAMethod @init, 'Write', NULL, @data; -- Calling a method
EXEC sp_OAMethod @init, 'SaveToFile', NULL, @fPath, 2; -- Calling a method
EXEC sp_OAMethod @init, 'Close'; -- Calling a method
EXEC sp_OADestroy @init; -- Closed the resources
print 'Document Generated at - '+  @fPath   

--Reset the variables for next use
SELECT @data = NULL  
, @init = NULL
, @fPath = NULL  
, @folderPath = NULL
SET @i -= 1
END