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Posted 11 Oct 2013

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Saving and Calling a image from SQL Server DB

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11 Oct 2013CPOL1 min read
DAL Should like following when inserting a image. I used the Enterprise Library to data access. Data type of EmployerImage is image @ SQL Server

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DAL Should like following when inserting a image. I used the Enterprise Library to data access. Data type of EmployerImage is image @ SQL Server table.

 

Public Sub Insert()
        Try
            Dim DB As Database = DatabaseFactory.CreateDatabase(CWB_DBCONNECTION_STRING)
            Dim DBC As DbCommand = DB.GetStoredProcCommand(EMPLOYERS_INSERT)
            DB.AddInParameter(DBC, "@EmployerID", DbType.Int64, EmployerID)         

            If EmployerImage Is Nothing Then
                DB.AddInParameter(DBC, "@EmployerImage", DbType.Binary, Nothing)
            Else
                DB.AddInParameter(DBC, "@EmployerImage", DbType.Binary, GetByteArrayFromImage(EmployerImage))

            End If

            DB.ExecuteNonQuery(DBC)
        Catch ex As Exception
            Throw
        End Try
 End Sub

 

Getting byte array from the image you need to create a function like following.

 Public Function GetByteArrayFromImage(ByVal img As Bitmap) As Byte()
        Try

            Dim ms As New System.IO.MemoryStream
            img.Save(ms, Imaging.ImageFormat.Bmp)
            Dim outBytes(CInt(ms.Length - 1)) As Byte
            ms.Seek(0, System.IO.SeekOrigin.Begin)
            ms.Read(outBytes, 0, CInt(ms.Length))
            Return outBytes
        Catch ex As Exception
            Return Nothing
            Throw

        End Try

    End Function

 

Calling the image from the SQL Server

 Public Sub SelectRow()
        Dim DB As Database = DatabaseFactory.CreateDatabase(CWB_DBCONNECTION_STRING)
        Dim DBC As DbCommand = DB.GetStoredProcCommand(EMPLOYERS_GETBYID)
        Try

            DB.AddInParameter(DBC, "@EmployerID", DbType.Int64, Me.EmployerID)
            Using DR As IDataReader = DB.ExecuteReader(DBC)

                With DR
                    Do While .Read
                                  
                        If Not IsDBNull(.Item("EmployerImage")) Then
                            EmployerImage = GetImageFromByteArray(.Item("EmployerImage"))
                        Else
                            EmployerImage = Nothing
                        End If                    


                    Loop
                End With

                If (Not DR Is Nothing) Then
                    DR.Close()
                End If
            End Using

        Catch ex As Exception
            Throw
        Finally
            DBC.Dispose()
        End Try
    End Sub

 

Getting saved image from SQL Server table

   Public Function GetImageFromByteArray(ByVal bytes As Byte()) As Bitmap
        Try
            Return CType(Bitmap.FromStream(New IO.MemoryStream(bytes)), Bitmap)
        Catch ex As Exception
            Return Nothing
            Throw
        End Try
    End Function

 

 

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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