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

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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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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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Working with Text Data
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Handling text is similar to handling images except for the data type used for the database column.
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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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Try It Out: Loading Text Data from a File
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To load text data from a file, follow these steps: 1. Add a Visual Basic Console Application project named LoadText to the solution. 2. Rename Module1.vb to LoadText.vb, and replace the code with that in Listing 18-4. Listing 18-4. LoadText.vb Imports System Imports System.Data Imports System.Data.SqlClient Imports System.Data.SqlTypes Imports System.IO Namespace LoadText Friend Class LoadText Private Shared fileName As String = "C:\Documents and Settings" & _ "\Toshiba User\My Documents\Visual Studio 2008" & _ "\Projects\18\LoadText\LoadText.vb" Private conn As SqlConnection = Nothing Private cmd As SqlCommand = Nothing Shared Sub Main() Dim loader As New LoadText() Try ' Get text file loader.GetTextFile(fileName) ' Open connection loader.OpenConnection() ' Create command loader.CreateCommand() ' Create table loader.CreateTextTable() ' Prepare insert command loader.PrepareInsertTextFile() ' Load text file loader.ExecuteInsertTextFile(fileName) Console.WriteLine("Loaded {0} into texttable.", fileName) Catch ex As SqlException Console.WriteLine(ex.ToString())
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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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Finally loader.CloseConnection() Console.WriteLine("Press any key to continue........") Console.ReadLine() End Try End Sub Private Sub CreateTextTable() ExecuteCommand("IF EXISTS" & ControlChars.CrLf & _ "(" & ControlChars.CrLf & "SELECT" & ControlChars.CrLf & _ "*" & ControlChars.CrLf & "FROM" & ControlChars.CrLf & _ "INFORMATION_SCHEMA.TABLES" & ControlChars.CrLf & _ "WHERE" & ControlChars.CrLf & "TABLE_NAME='TEXTTABLE'" & _ ControlChars.CrLf & ")" & ControlChars.CrLf & _ "DROP TABLE TEXTTABLE") ExecuteCommand("CREATE TABLE TEXTTABLE" & _ ControlChars.CrLf & "(" & ControlChars.CrLf & _ "textfile varchar(255)," & ControlChars.CrLf & _ "textdata varchar(max))" & ControlChars.CrLf) End Sub Private Sub OpenConnection() ' Create connection conn = New SqlConnection("Server=.\sqlexpress;" & _ "Integrated Security=True;Database=tempdb") ' Open connection conn.Open() End Sub Private Sub CloseConnection() ' Close connection conn.Close() End Sub
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Private Sub CreateCommand() cmd = New SqlCommand() cmd.Connection = conn End Sub
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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
Private Sub ExecuteCommand(ByVal commandText As String) Dim commandResult As Integer cmd.CommandText = commandText Console.WriteLine("Executing command:") Console.WriteLine(cmd.CommandText) commandResult = cmd.ExecuteNonQuery() Console.WriteLine("ExecuteNonQuery returns {0}.", commandResult) End Sub Private Sub PrepareInsertTextFile() cmd.CommandText = "" & ControlChars.CrLf & _ "insert into texttable" & ControlChars.CrLf & _ "values (@textfile, @textdata)" & ControlChars.CrLf cmd.Parameters.Add("@textfile", SqlDbType.NVarChar, 30) cmd.Parameters.Add("@textdata", SqlDbType.Text, 1000000) End Sub Private Sub ExecuteInsertTextFile(ByVal textFile As String) Dim textData As String = GetTextFile(textFile) cmd.Parameters("@textfile").Value = textFile cmd.Parameters("@textdata").Value = textData ExecuteCommand(cmd.CommandText) End Sub Private Function GetTextFile(ByVal textFile As String) As String Dim textBytes As String = Nothing Console.WriteLine("Loading File: " & textFile) Dim fs As New FileStream(textFile, FileMode.Open, FileAccess.Read) Dim sr As New StreamReader(fs) textBytes = sr.ReadToEnd() Console.WriteLine("TextBytes has length {0} bytes.", textBytes.Length) Return textBytes End Function End Class End Namespace 3. Make LoadText the startup project, and run it by pressing Ctrl+F5. You should see the results in Figure 18-5.
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