尝试将二进制文件插入varbinary列时出现一个奇怪的错误。体系结构如下:
具有此表对象的SQL Server 2008数据库:
CREATE TABLE [dbo].[BLOBs] (
[FileName] nvarchar(128) NOT NULL
, [FileExt] AS CASE
WHEN CHARINDEX(N'.', [FileName]) > 0 THEN REVERSE(SUBSTRING(REVERSE([FileName]), 1, CHARINDEX('.', REVERSE([FileName])) - 1))
ELSE NULL
END PERSISTED
, [FileBLOB] [varbinary](max) NOT NULL
, CONSTRAINT [PK_BLOBs] PRIMARY KEY CLUSTERED ( [FileName] ASC ) ON [DEFAULT]
) ON [DEFAULT];
GO
此表已链接到MS Access 2007应用程序,作为包含此“快速不干净”编写模块的表BLOBs
:
Public Function saveBLOB(strFQFN As String) As Long
10 If HandleErrors() Then On Error GoTo ERR_HANDLING
20 ErrorHandler().CallStack.PushCallStack "saveBLOB('" & strFQFN & "')"
Dim db As DAO.Database
Dim rs As DAO.Recordset
Dim fs As Long
Dim fn As String
Dim hdl As Integer
Dim blob() As Byte
30 fn = Right(strFQFN, Len(strFQFN) - InStrRev(strFQFN, "\"))
' read data from file
40 hdl = FreeFile()
50 Open strFQFN For Binary Access Read As #hdl
60 fs = LOF(hdl) - 1
70 ReDim blob(fs)
90 Get #hdl, , blob
' updateblob data in database
100 Set db = CurrentDb()
110 Set rs = db.OpenRecordset("BLOBs", dbOpenDynaset, dbSeeChanges)
120 rs.FindFirst ("[FileName] = '" & fn & "'")
130 If rs.NoMatch Then
140 rs.AddNew
150 rs!FileName = fn
160 Else
170 rs.Edit
180 End If
190 rs!FileBLOB = blob
200 rs.Update
210 saveBLOB = True
CLEANUP:
8000 Close #hdl
8010 On Error Resume Next
8020 rs.close
8030 Set rs = Nothing
8040 Set db = Nothing
8050 Erase blob
FINALLY:
9000 On Error GoTo 0
9010 ErrorHandler().CallStack.PopCallStack
9020 Exit Function
ERR_HANDLING:
9900 ErrorHandler().handleError ErrSinkScreen, "saveBLOB()"
9910 saveBLOB = False
9920 Resume CLEANUP
End Function
顺便说一句:ODBC驱动程序是SQL Server版本6.01.7601.17514(SQLSRV32.DLL
,21.11.2010)。
只要我通过即时窗口调用该函数,一切都可以运行[[fine:
? saveBLOB("U:\example.txt")
-1
blob数据已成功保存。现在有一个小子形式:
Private Sub UploadFile() 10 If HandleErrors() Then On Error GoTo ERR_HANDLING 20 ErrorHandler().CallStack.PushCallStack Me.Name & ".UploadFile()" 30 If (Not saveBLOB(Nz(Me!txtFQFN, vbNullString))) Then _ MsgBox "Beim Speichern des BLOBs in der Datenbank ist ein Fehler aufgetreten.", vbExclamation FINALLY: 9000 ErrorHandler().CallStack.PopCallStack 9010 Exit Sub ERR_HANDLING: 9900 ErrorHandler().handleError ErrSinkDatabase + ErrSinkScreen, Me.Name & ".UploadFile()" 9910 Resume FINALLY End Sub
如果从此处调用saveBLOB()
,则会发生错误(您试图将Null值分配给非Variant数据类型的变量。]>:
UPDATE
:这似乎是一个大小问题。插入了一个新创建的8KB的Excel文件。导入681KB的文件失败。 Blob列为varbinary(max)
。根据docs.microsoft.com:
非常感谢!max
表示最大存储大小为2 ^ 31-1字节。因此681KB应该完全适合。
尝试将二进制文件插入varbinary列时出现一个奇怪的错误。体系结构如下:具有此表对象的SQL Server 2008数据库:CREATE TABLE [dbo]。[BLOBs]([FileName] ...