Developing Your Own SQL Server Based Data Access Helper using COM+ and VB.NET - Retrieving a BLOB value from the database

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The following method gives you an idea of how to retrieve BLOB values from the database:

    Public Sub getBLOBValue(ByVal sqlSELECT As String, ByRef
BinData() As Byte)
        Dim Conn As SqlConnection
        Dim cmd As SqlCommand
        Dim ByteArray() As Byte
        Try
            Conn = New SqlConnection(_ConnectionString)
            cmd = New SqlCommand(sqlSELECT, Conn)
            Dim dr As SqlDataReader
            With cmd
                .Connection.Open()
                dr = .ExecuteReader()
                dr.Read()
                ByteArray = dr.GetValue(0)
                BinData = ByteArray
                dr.Close()
                .Connection.Close()
                .Dispose()
            End With
        Catch ex As Exception
            Try
                If cmd.Connection.State = ConnectionState.Open
Then
                    cmd.Connection.Close()
                    cmd.Dispose()
                End If
            Catch e As Exception
                'do nothing...if still error persists
            End Try
            Throw New Exception(ex.Message & ". SQL Statement: "
& sqlSELECT)
        End Try
    End Sub

Please note that I used the “ByRef” in the above method to send back the BLOB data.

Any feedback, suggestions, bugs, errors, improvements etc., are highly appreciated at jag_chat@yahoo.com.

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