Must declare the scalar variable  Error

Posted on 2009-05-11
Last Modified: 2012-05-06
I am getting an error 'Must declare the scalar variable @Blob" when I run the following code VB >net 2005 against MS SQL Server 2008.  This worked fine when run against a MS Access database.

Can someone tell me how to fix the problem?

Friend Sub SendToBLOBNew(ByRef dbConnection As System.Data.IDbConnection, _

                             ByRef lVersionNo As Long, _

                             ByRef strFile As String, _

                             ByRef strFolder As String)


        Dim cmd As New OleDbCommand()


        cmd.CommandText = _

        "INSERT INTO tbl_Object(VersionId,Component,Blob) VALUES (" + CStr(lVersionNo) + "," + _

                                                                  "'" & strFile & "'," + _



        cmd.Connection = dbConnection


        Dim fs As New System.IO.FileStream(strFolder + strFile, IO.FileMode.Open, IO.FileAccess.Read)


        Dim b(fs.Length() - 1) As Byte


        fs.Read(b, 0, b.Length)



        fs = Nothing


        ' ***** Compress file before submitting to source control *****

        Dim byteCompressedByteArray As Byte()


        byteCompressedByteArray = mobjCompression.ZipFile(, b)


        Dim P As New OleDbParameter()


        With P

            .ParameterName = "@BLOB"

            .OleDbType = OleDbType.LongVarBinary

            .Size = byteCompressedByteArray.Length

            .Direction = ParameterDirection.Input

            .IsNullable = False

            .Precision = 0

            .Scale = 0

            .SourceColumn = Nothing

            .SourceVersion = DataRowVersion.Current

            .Value = byteCompressedByteArray

        End With








    End Sub

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Question by:FINDERSOL
  • 2

Expert Comment

ID: 24356683
instead of OleDbParameter use SQLParameter

Expert Comment

ID: 24356686
LVL 41

Expert Comment

ID: 24357006

Trust the message, @Blob is not defined. Your problem seems to be here:
 cmd.CommandText = _
        "INSERT INTO tbl_Object(VersionId,Component,Blob) VALUES (" + CStr(lVersionNo) + "," + _
                                                                  "'" & strFile & "'," + _

 Try defining the blob variable, and then change the insert statement. (Because blob will be a string, then you need to make sure you have in between quotes.

DIM blob as string

cmd.CommandText = _
        "INSERT INTO tbl_Object(VersionId,Component,Blob) VALUES (" + CStr(lVersionNo) + "," + _
                                                                  "'" & strFile & "'," + "''" + blob+ "'')"
LVL 142

Accepted Solution

Guy Hengel [angelIII / a3] earned 500 total points
ID: 24357423
with oledb, you don't write @var in the sql:
  cmd.CommandText = _
        "INSERT INTO tbl_Object(VersionId,Component,Blob) VALUES (" + CStr(lVersionNo) + "," + _
                                                                  "'" & strFile & "', ? )"
        cmd.Connection = dbConnection

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