我正在尝试使用
OpenSqlFilestream
说明但我的代码没有认出来
为了使用它，我需要加载什么？
亲爱的marc_s看看我的代码
Public Sub WriteFileStream(ByVal imSource As Byte(), ByVal imSize As Integer, ByVal imTy As Type, ByVal sender As Object, ByVal e As EventArgs)
Dim subProvider As String = Nothing
Dim subDataSource As Object = Nothing
Dim subUid As String = Nothing
Dim subPwd As String = Nothing
Dim subDataBase As String = Nothing
Dim subPSI As Boolean = Nothing
Dim ParamXML() As String = Nothing
Dim TypeOfServer As String = "Remote"
Dim imParam(3) As String
Dim imTable(1) As String
Dim RemoteSQLcmd As SqlCommand = New SqlCommand
Dim tokenReader As SqlDataReader
'-------------------------------------------------'
Dim AbsRecord As Int64 = 0
Dim VarString(10) As String
Dim VarInt(10) As Integer
'-------------------------------------------------'
ParamXML = Split(loadXmlFile(TypeOfServer, sender, e), "|")
subUid = ParamXML(3)
subProvider = ParamXML(0)
subDataSource = ParamXML(1)
subDataBase = ParamXML(2)
subPwd = ParamXML(4)
subPSI = ParamXML(5)
Dim SchemaID As String = Convert.ToInt16(ParamXML(8))
Dim SchemaName As String = Nothing
If SchemaID = 1 Then
SchemaName = subUid
ElseIf SchemaID = 2 Then
SchemaName = "dbo"
ElseIf SchemaID = 0 Then
SchemaName = "dbo"
End If
'-------------------------------------------------'
imTable(0) = "tPDetails"
imTable(1) = "tPImages"
Try
imParam(0) = Me.TextBox1.Text.Trim.ToString 'Name'
imParam(1) = Me.TextBox2.Text.Trim.ToString 'Code'
imParam(2) = Me.TextBox3.Text.Trim.ToString 'Price'
imParam(3) = Me.TextBox4.Text.Trim.ToString 'Comments'
'========================================================'
If RemoteSQLConn.State = ConnectionState.Open Then RemoteSQLConn.Close()
SQL_Connection(TypeOfServer, TypeOfServer & "Conn.xml", sender, e)
RemoteSQLConn.open()
'----------------------'
Dim imHolder As Image = Image.FromStream(imStream)
Dim imHeight As Integer = imHolder.Height
Dim imWidth As Integer = imHolder.Width
Dim imLength As Integer = imHolder.PropertyItems.Length
Dim imType As Type = imTy
'----------------------'
Dim FirstColumnNames As String = _
imTable(0) & "_Code, " & _
imTable(0) & "_Price, " & _
imTable(0) & "_Title, " & _
imTable(0) & "_Type, " & _
imTable(0) & "_Height, " & _
imTable(0) & "_Width, " & _
imTable(0) & "_Stock, " & _
imTable(0) & "_Comments "
Dim FirstFieldsValues As String = "'" & imParam(1) & "', '" & _
imParam(2) & "', '" & _
imParam(0) & "', '" & _
imType.ToString & "', '" & _
imHeight & "', '" & _
imWidth & "', '" & _
"0', '" & _
imParam(3) & "' "
'--------------------------------------------'
RemoteSQLcmd = New SqlCommand("INSERT INTO " & _
SchemaName & "." & imTable(0) & " (" & FirstColumnNames & ") VALUES (" & FirstFieldsValues & ") ", RemoteSQLConn)
RemoteSQLcmd.ExecuteNonQuery()
'--------------------------------------------------'
RemoteSQLcmd = New SqlCommand("SELECT * FROM " & SchemaName & "." & imTable(0) & _
" WHERE " & imTable(0) & "_Code = " & "'" & imParam(1) & "'", RemoteSQLConn)
AbsRecord = RemoteSQLcmd.ExecuteScalar
'--------------------------------------------------'
RemoteSQLcmd = New SqlCommand("INSERT INTO " & SchemaName & "." & imTable(1) & " VALUES (newid(), " & AbsRecord & ", CAST('' as varbinary(max)))", RemoteSQLConn)
RemoteSQLcmd.ExecuteNonQuery()
'--------------------------------------------------'
RemoteSQLcmd = New SqlCommand("SELECT " & imTable(1) & "_Image.PathName() FROM " & _
SchemaName & "." & imTable(1) & " WHERE " & imTable(1) & "_" & imTable(0) & "_ID = " & AbsRecord, RemoteSQLConn)
Dim filePathName As String = Nothing
Dim pathObj As Object = RemoteSQLcmd.ExecuteScalar()
'-------------------------------------------------- Path Name '
If Not pathObj.Equals(DBNull.Value) Then
filePathName = DirectCast(pathObj, String)
Else
Throw New System.Exception("Image.PathName() failed to read the path name for the Image column.")
End If
'-------------------------- GET_FILESTREAM_TRANSACTION_CONTEXT()'
Dim RemoteSQLtx As SqlTransaction = RemoteSQLConn.BeginTransaction("MainTranaction")
RemoteSQLcmd.Transaction = RemoteSQLtx
RemoteSQLcmd = New SqlCommand("SELECT GET_FILESTREAM_TRANSACTION_CONTEXT()", RemoteSQLConn, RemoteSQLtx)
Dim tokenObject As Object = RemoteSQLcmd.ExecuteScalar()
'-------------------------------------- File Token '
tokenReader = RemoteSQLcmd.ExecuteReader(CommandBehavior.SingleRow)
tokenReader.Read()
Dim txContext As SqlBinary = DirectCast(tokenObject, Byte())
tokenReader.Close()
'-----------------------------------------------'
Try
'-------------------- Closing all connections'
If RemoteSQLConn.State = ConnectionState.Open Then RemoteSQLConn.Close()
If RemoteSQLcmd.Connection.State = ConnectionState.Open Then RemoteSQLcmd.Connection.Close()
If RemoteConnInfo.State = ConnectionState.Open Then RemoteConnInfo.Close()
RemoteSQLtx.Dispose() '.Connection.State = ConnectionState.Open Then RemoteSQLtx.Connection.Close()
'-------------------- Open connections for Indegrated Security''
ChangeLoginPerson("PRINCIDEVEL\Administrator")
RemoteConnInfo.ConnectionString = "Provider=" & subProvider & "; Data Source=" & subDataSource & _
"; Database=" & subDataBase & "; Integrated Security=" & "SSPI" & "; Persist Security Info=" & subPSI
RemoteSQLcmd.Connection.Open()
RemoteSQLConn = New SqlConnection("Server=" & subDataSource & "; Integrated Security=TRUE" & "; database=" & subDataBase)
RemoteSQLConn.Open()
RemoteSQLtx = RemoteSQLConn.BeginTransaction("MainTranaction")
RemoteSQLcmd.Transaction = RemoteSQLtx
'------------------------- Write in to file stream ---------------'
Dim imImage As Byte() = New Byte(imStream.Length) {}
Dim bytesRead As Integer = imStream.Read(imImage, 0, imStream.Length)
Dim sqlFile As New SqlFileStream(filePathName, txContext, FileAccess.ReadWrite, FileOptions.WriteThrough, 0)
Dim numBytes As Integer = 0
Dim unicode As Encoding = Encoding.GetEncoding(0)
While bytesRead > 0
sqlFile.Write(imImage, 0, bytesRead)
bytesRead = imStream.Read(imImage, 0, imSize)
End While
RemoteSQLtx.Commit()
RemoteSQLcmd.Transaction.Commit()
sqlFile.Close()
Catch FsEx As Exception
MessageBox.Show(FsEx.Message, "Write in SQL File Stream ", MessageBoxButtons.OK, MessageBoxIcon.Stop)
Finally
End Try
'--------------------------------------------------'
Catch ex As Exception
MessageBox.Show(ex.Message, "WriteFileStream ", MessageBoxButtons.OK, MessageBoxIcon.Stop)
Finalize()
Finally
RemoteSQLConn.Close()
imStream.Close()
End Try
End Sub
答案 0 :(得分：2)
在打开文件流之前，您是否已执行所有必要步骤？抓住事务中的上下文??
查看此article here以获取有关如何执行此操作的详细讨论。这是另一个带有VB.NET示例代码片段的blog post。
更新： Lefteris，您的代码片段非常难以阅读和理解，我尽了最大努力，但我真的不确定。我在想的是你过快地关闭交易。您似乎创建了一个连接和一个事务来获取GET_FILESTREAM_TRANSACTION_CONTEXT，但是在您实际写出字节之前再次关闭它。我认为事务应该跨越所有操作 - 它应该在获取事务上下文之前启动，并且它应该在整个写操作中保持活动状态，并且只有在整个写操作完成后才会提交。
我试图想出一个更简单的代码片段来向您展示 - 它是在C＃中，因为我无法将其转换回VB.NET：
public static void WriteFileStream(byte[] imSource, int imSize)
{
// use your own SQL insert command here instead
const string InsertCmd = "INSERT INTO PhotoAlbum(PhotoId, Description)" +
" VALUES(@PhotoId, @Description)";
using (SqlConnection conn = new SqlConnection(ConnStr))
{
conn.Open();
// create transaction here and let it stay alive!
using (SqlTransaction txn = conn.BeginTransaction())
{
using (SqlCommand cmd = new SqlCommand(InsertCmd, conn, txn))
{
cmd.Parameters.Add("@PhotoId", SqlDbType.Int).Value = photoId;
cmd.Parameters.Add("@Description", SqlDbType.VarChar).Value = desc;
cmd.ExecuteNonQuery();
}
SafeFileHandle handle = GetOutputFileHandle(photoId, txn);
MemoryStream inputStream = new MemoryStream(imSource);
using (FileStream dest = new FileStream(handle, FileAccess.Write))
{
byte[] buffer = new byte[BlockSize];
int bytesRead;
while ((bytesRead = inputStream.Read(buffer, 0, buffer.Length)) > 0)
{
dest.Write(buffer, 0, bytesRead);
}
dest.Close();
}
inputStream.Close();
// commit transaction here, after all is done
txn.Commit();
}
conn.Close();
}
}
这是改编自博客文章SQL Server 2008 FILESTREAM Part 3: OpenSqlFileStream API - 一定要检查出来！