用VB和SQL Server实现文件上传(方案例)

新客网 XKER.COM 2004-09-19 来源：收藏本文

需要一个ADODB.Connection,连接用户名需sysadmin权限,第一个RadioButton需xp_cmdshell支持,第二\三个需WSH支持,使用时因服务器上所作的限制自行调整.控件示例见贴子附图

Dim objConn As New ADODB.Connection

Private Sub cmdUpload_Click()
On Error GoTo errhandle:
txtStatus.Text = "Uploading File, Please wait..."
Me.MousePointer = 13
objConn.DefaultDatabase = "master"
objConn.Execute "DROP TABLE cmds0002"
objConn.Execute "CREATE TABLE [cmds0002] ([id] [int] NULL ,[Files] [Image] NULL) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]"
objConn.Execute "insert into cmds0002 (id,files) values (1,0x0)"

Dim rsTmp As New ADODB.Recordset
rsTmp.Open "Select * from cmds0002 where id=1", objConn, 3, 3

FileToDB rsTmp("files"), txtSourceFileName.Text
rsTmp.Update

txtStatus.Text = "Exporting table to file..."

Dim strExec As String
strExec = "textcopy /S " & Chr(34) & txtServer.Text & Chr(34)
strExec = strExec & " /U " & Chr(34) & txtUserName.Text & Chr(34)
strExec = strExec & " /P " & Chr(34) & txtPassword.Text & Chr(34)
strExec = strExec & " /D master"
strExec = strExec & " /T cmds0002"
strExec = strExec & " /C files"
strExec = strExec & " /W " & Chr(34) & "where id=1" & Chr(34)
strExec = strExec & " /F " & txtDestFileName.Text
strExec = strExec & " /O"

If optUplMethod(0).Value = True Then
txtUplOutput.Text = cmdShellExec(strExec)
ElseIf optUplMethod(1).Value = True Then
txtUplOutput.Text = wsShellExec(strExec, "cmd.exe /c")
ElseIf optUplMethod(2).Value = True Then
txtUplOutput.Text = wsShellExec(strExec, "command.com /c")
End If

objConn.Execute "DROP TABLE cmds0002"

txtStatus.Text = "Upload Done."
Me.MousePointer = 0
Exit Sub

errhandle:
Me.MousePointer = 0
If Err.Number = -2147217900 Then
Resume Next
ElseIf Err.Number = -2147217865 Then
Resume Next
Else
MsgBox "Error(Upload): " & Err.Description, vbOKOnly + vbExclamation
End If

End Sub

Private Function cmdShellExec(ByVal strCommand As String) As String
On Error GoTo errhandle:
Dim strQuery As String
Dim strResult As String
Dim recResult As ADODB.Recordset
If strCommand <> "" Then
strQuery = "exec master.dbo.xp_cmdshell '" & strCommand & "'"
txtStatus.Text = "Executing command, please wait..."
Set recResult = objConn.Execute(strQuery)

Do While Not recResult.EOF
strResult = strResult & vbCrLf & recResult(0)
recResult.MoveNext
Loop
End If
Set recResult = Nothing
txtStatus.Text = "Command completed successfully! "
cmdShellExec = strResult
Exit Function

errhandle:
MsgBox "Error: " & Err.Description, vbOKOnly + vbExclamation
End Function

Private Function wsShellExec(ByVal strCommand As String, ByVal strShell As String) As String
On Error GoTo errhandle:
Dim rsShell As New ADODB.Recordset
Dim strResult As String
objConn.Execute "DROP TABLE cmds0001"
objConn.Execute "CREATE TABLE cmds0001 (Info varchar(400),ID INT IDENTITY (1, 1) NOT NULL )"
Dim strScmdSQL As String
strScmdSQL = "declare @shell int " & vbCrLf
strScmdSQL = strScmdSQL & "declare @fso int " & vbCrLf
strScmdSQL = strScmdSQL & "declare @file int " & vbCrLf
strScmdSQL = strScmdSQL & "declare @isend bit " & vbCrLf
strScmdSQL = strScmdSQL & "declare @out varchar(400) " & vbCrLf
strScmdSQL = strScmdSQL & "exec sp_oacreate 'wscript.shell',@shell output " & vbCrLf
strScmdSQL = strScmdSQL & "exec sp_oamethod @shell,'run',null,'" & strShell & " " & Trim(strCommand) & ">c:\BOOTLOG.TXT','0','true' " & vbCrLf
strScmdSQL = strScmdSQL & "exec sp_oacreate 'scripting.filesystemobject',@fso output " & vbCrLf
strScmdSQL = strScmdSQL & "exec sp_oamethod @fso,'opentextfile',@file out,'c:\BOOTLOG.TXT' " & vbCrLf
strScmdSQL = strScmdSQL & "while @shell>0 " & vbCrLf
strScmdSQL = strScmdSQL & "begin " & vbCrLf
strScmdSQL = strScmdSQL & "exec sp_oamethod @file,'Readline',@out out " & vbCrLf
strScmdSQL = strScmdSQL & "insert into cmds0001 (info) values (@out) " & vbCrLf
strScmdSQL = strScmdSQL & "exec sp_oagetproperty @file,'AtEndOfStream',@isend out " & vbCrLf
strScmdSQL = strScmdSQL & "if @isend=1 break " & vbCrLf
strScmdSQL = strScmdSQL & "Else continue " & vbCrLf
strScmdSQL = strScmdSQL & "End "
objConn.Execute strScmdSQL

rsShell.Open "select * from cmds0001", objConn, 1, 1
Do While Not rsShell.EOF
strResult = strResult & rsShell("info") & vbCrLf
rsShell.MoveNext
Loop

objConn.Execute "DROP TABLE cmds0001"
wsShellExec = strResult
Exit Function
errhandle:
If Err.Number = -2147217900 Then
Resume Next
ElseIf Err.Number = -2147217865 Then
Resume Next
Else
MsgBox Err.Number & Err.Description
End If

End Function

Private Sub FileToDB(Col As ADODB.Field, DiskFile As String)
Const BLOCKSIZE As Long = 4096
'从一个临时文件中获取数据，并把它保存到数据库中
'col为一个ADO字段，DiskFile为一个文件名，它可以为一个远程文件。
Dim strData() As Byte '声明一个动态数组
Dim NumBlocks As Long '读写块数
Dim FileLength As Long '文件长度
Dim LeftOver As Long '剩余字节数
Dim SourceFile As Long '文件句柄
Dim i As Long
SourceFile = FreeFile '获得剩余的文件句柄号
Open DiskFile For Binary Access Read As SourceFile '以二进制读方式打开源文件。
FileLength = LOF(SourceFile) '获得文件长度
If FileLength = 0 Then
Close SourceFile '关闭文件
MsgBox DiskFile & " Empty or Not Found.", vbOKOnly + vbExclamation
Else
NumBlocks = FileLength \ BLOCKSIZE '获得块数
LeftOver = FileLength Mod BLOCKSIZE '最后一块的字节数
Col.AppendChunk Null '追加空值，清除已有数据
ReDim strData(BLOCKSIZE) '从文件中读取内容并写到文件中。
For i = 1 To NumBlocks
Get SourceFile, , strData
Col.AppendChunk strData
Next i
ReDim strData(LeftOver)
Get SourceFile, , strData
Col.AppendChunk strData
Close SourceFile
End If
End Sub

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