vb.net qr code sample s WORKING WITH TEXT AND BINARY DATA in Visual Basic .NET

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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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cmd.Prepare() End Sub Private Sub ExecuteInsertImages(ByVal _ imageFileNumber As Integer) Dim imageFileName As String = Nothing Dim imageImageData() As Byte = Nothing imageFileName = imageFilePrefix + _ imageFileNumber.ToString() _ & imageFileType imageImageData = LoadImageFile _ (imageFileName, imageFileLocation, maxImageSize) cmd.Parameters("@imagefile").Value = imageFileName cmd.Parameters("@imagedata").Value = imageImageData ExecuteCommand(cmd.CommandText) Console.WriteLine(ControlChars.NewLine) End Sub Private Function LoadImageFile(ByVal fileName As String, _ ByVal fileLocation As String, ByVal maxImageSize _ As Integer) As Byte() Dim imagebytes() As Byte = Nothing Dim fullpath As String = fileLocation & fileName Console.WriteLine(ControlChars.NewLine) Console.WriteLine("Loading File:") Console.WriteLine(fullpath) Dim fs As New FileStream(fullpath, _ FileMode.Open, FileAccess.Read) Dim br As New BinaryReader(fs) imagebytes = br.ReadBytes(maxImageSize) Console.WriteLine("Imagebytes has length {0} bytes.", _ imagebytes.GetLength(0)) Console.WriteLine(ControlChars.NewLine) Return imagebytes End Function End Class End Namespace
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s Note If you want to run the LoadImages program again, you must ensure that you drop/delete the
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imagetable from the SQL Server tempdb database; it is already present and your program will try to
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re-create it, which means you will receive an exception.
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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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3. Run the program by pressing Ctrl+F5. You should see output similar to that in Figure 18-1. It shows the information for loading an image we have on our PC at the specified location, the operations performed, and the size of each of the image.
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Figure 18-1. Loading image data 4. To see the image you have inserted into the database, open SQL Server Management Studio Express (SSMSE) and run a SELECT query on the image table you have created in the tempdb database (see Figure 18-2).
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Figure 18-2. Viewing image data
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How It Works
In the Main method, you do three major things. You call an instance method to create a table to hold images: ' Create table loader.CreateImageTable() You call an instance method to prepare a command (yes, you finally prepare a command, since you expect to run it multiple times) to insert images: ' Prepare insert loader.PrepareInsertImages() You then loop through the image files and insert them: ' Insert images Dim i As Integer For i = 1 To loader.numberImageFiles loader.ExecuteInsertImages(i) Next i Note that you connect to tempdb, the temporary database that s re-created when SQL Server starts: ' Create connection conn = New SqlConnection("Server=.\sqlexpress;" & _ "Integrated Security=True;Database=tempdb") ' Open connection conn.Open() The tables in this database are temporary; that is, they re always deleted when SQL Server stops. This is ideal for these examples and many other situations, but don t use tempdb for any data that needs to persist permanently. When you create the table, a simple one containing the image file name and the image, you use the VARBINARY(MAX) data type for the imagedata column: Private Sub CreateImageTable() ExecuteCommand("CREATE Table imagetable" & _ "(imagefile nvarchar(20)," & _ "imagedata varbinary(max))") End Sub But when you configure the INSERT command, you use the Image member of the SqlDbType enumeration, since there is no member for the VARBINARY(MAX) data type. You specify lengths for both variable-length data types, because you can t prepare a command unless you do. Private Sub PrepareInsertImages() cmd.CommandText = "" & ControlChars.CrLf & _ "insert into imagetable" & ControlChars.CrLf & _ "values (@imagefile, @imagedata)" & ControlChars.CrLf
CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
cmd.Parameters.Add("@imagefile", _ SqlDbType.NVarChar, 20) cmd.Parameters.Add("@imagedata", _ SqlDbType.Image, 1000000) cmd.Prepare() End Sub The ExecuteInsertImages method accepts an integer to use as a suffix for the image file name, calls LoadImageFile to get a byte array containing the image, assigns the file name and image to their corresponding command parameters, and then executes the command to insert the image: Private Sub ExecuteInsertImages(ByVal _ imageFileNumber As Integer) Dim imageFileName As String = Nothing Dim imageImageData() As Byte = Nothing imageFileName = imageFilePrefix + _ imageFileNumber.ToString() _ & imageFileType imageImageData = LoadImageFile _ (imageFileName, imageFileLocation, maxImageSize) cmd.Parameters("@imagefile").Value = imageFileName cmd.Parameters("@imagedata").Value = imageImageData ExecuteCommand(cmd.CommandText) Console.WriteLine(ControlChars.NewLine) End Sub The LoadImageFile function reads the image file, displays the file name and number of bytes in the file, and returns the image as a byte array: Private Function LoadImageFile(ByVal fileName As String, _ ByVal fileLocation As String, ByVal maxImageSize _ As Integer) As Byte() Dim imagebytes() As Byte = Nothing Dim fullpath As String = fileLocation & fileName Console.WriteLine(ControlChars.NewLine) Console.WriteLine("Loading File:") Console.WriteLine(fullpath) Dim fs As New FileStream(fullpath, _ FileMode.Open, FileAccess.Read) Dim br As New BinaryReader(fs) imagebytes = br.ReadBytes(maxImageSize)
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