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You declare a type, Images, to access the database and provide methods for the form components to easily get and display images. In its constructor, you connect to the database and create a data reader to handle the result set of a query that retrieves all the images you stored earlier: ' Constructor Public Sub New() imageConnection = New SqlConnection("Server=.\sqlexpress;" & _ "Integrated Security=True;Database=tempdb") imageCommand = New SqlCommand("" & ControlChars.CrLf & _ "select" & ControlChars.CrLf & "imagefile," & _ ControlChars.CrLf & "imagedata" & ControlChars.CrLf & _ "from" & ControlChars.CrLf & "imagetable" & _ ControlChars.CrLf & "", imageConnection) ' Open connection and create data reader imageConnection.Open() imageReader = imageCommand.ExecuteReader() End Sub When the form is initialized, the new code creates an instance of Images, looks for an image with GetRow(), and, if it finds one, assigns the file name and image to the text box and picture box with the GetFilename and GetImage methods, respectively:

LINQ to SQL is a facility for managing and accessing relational data as objects. It s logically similar to ADO.NET in some ways but views data from a more abstract perspective that simplifies many operations. It connects to a database, converts LINQ constructs into SQL, submits the SQL, transforms results into objects, and can even track changes and automatically request database updates. A simple LINQ query requires three things: Entity classes A data context A LINQ query

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What do you think of the following example, where a backup of the master boot record (MBR) is created Just make sure that the first 512 bytes of your hard drive, which contains the MBR, is copied to some file, as in dd if=/dev/sda of=/boot/mbr_backup bs=512 count=1 In this example, two new parameters are used First, the parameter bs=512 specifies that the block should be 512 bytes Next, the parameter count=1 indicates that only one such block has to be copied Without this parameter, you would copy your entire hard drive, which I don t recommend The backup copy of your MBR may be useful if some day you can t boot your server anymore because of a problem in the MBR If this happens, just boot from a rescue disk and use the command dd if=/boot/mbr_backup of=/dev/sda bs=446 count=1.

Let s use LINQ to SQL to retrieve all customers from the Northwind Customers table. 1. Rename the 18 project in the 18 solution to LinqToSql. Replace the code in Module1.vb with the code in Listing 18-1.

images = New DisplayImage.Images() If images.GetRow() Then Me.TextBox1.Text = images.GetFilename() Me.PictureBox1.Image = CType(images.GetImage(), Image) Else Me.TextBox1.Text = "DONE" Me.PictureBox1.Image = Nothing End If You call the endImages method when the form terminates to close the connection. (Were you to use a dataset instead of a data reader, you could close the connection in the Images instance immediately after the images are retrieved, which would be a good exercise for you to attempt.) Protected Overrides Sub Dispose(ByVal disposing As Boolean) images.EndImages() If disposing AndAlso components IsNot Nothing Then components.Dispose() End If MyBase.Dispose(disposing) End Sub The image is returned from the database as an array of bytes. The PictureBox control Image property can be a Bitmap, Icon, or Metafile (all derived classes of Image). Bitmap supports a variety of formats, including BMP, GIF, and JPG. The GetImage function, shown here, returns a Bitmap object: Public Function GetImage() As Bitmap Dim ms As New MemoryStream(imageBytes) Dim bmap As New Bitmap(ms) Return bmap End Function Bitmap s constructor doesn t accept a byte array, but it will accept a MemoryStream (which is effectively an in-memory representation of a file), and MemoryStream has a constructor that accepts a byte array. So, you create a memory stream from the byte array and then create a bitmap from the memory stream.

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