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

Creating Data Matrix 2d barcode in Visual Basic .NET s WORKING WITH TEXT AND BINARY DATA

CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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Figure 18-5. Loading a text file into a table
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You simply load the source code for the LoadText program: Private Shared fileName As String = "C:\Documents and Settings" & _ "\Toshiba User\My Documents\Visual Studio 2008" & _ "\Projects\18\LoadText\LoadText.vb" into a table: cmd.CommandText = "" & ControlChars.CrLf & _ "insert into texttable" & ControlChars.CrLf & _ "values (@textfile, @textdata)" & ControlChars.CrLf cmd.Parameters.Add("@textfile", SqlDbType.NVarChar, 30) 'the image gets stored in the form of of an Image string. ' figure 1000000 specifies the bytes for the amount to ' specify the size of the Image string. cmd.Parameters.Add("@textdata", SqlDbType.Text, 1000000) that you created in the temporary database:
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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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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) Note that you first check to see whether the table exists. If it does, you drop it so you can re-create it.
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s Note The information_schema.tables view (a named query) is compatible with the SQL standard
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INFORMATION_SCHEMA view of the same name. It limits the tables you can see to the ones you can access. Microsoft recommends you use the new catalog views to get database metadata in SQL Server 2005, and SQL Server itself uses them internally. The catalog view for this query would be sys.tables, and the column name would be name. We ve used the INFORMATION SCHEMA view here because you may still see it often.
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Instead of the BinaryReader you use for images, GetTextFile uses a StreamReader (derived from System.IO.TextReader) to read the contents of the file into a string: 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 Otherwise, the processing logic is basically the same as you ve seen many times throughout the book: open a connection, access a database, and then close the connection. Now let s retrieve the text you just stored.
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CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
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Retrieving Data from Text Columns
Retrieving data from text columns is just like retrieving it from the smaller character data types. You ll now write a simple console program to see how this works.
Try It Out: Retrieving Text Data
To retrieve data from text columns, follow these steps: 1. Add a Visual Basic Console Application project named RetrieveText to the solution. 2. Rename Module1.vb to RetrieveText.vb, and replace the code with that in Listing 18-5. Listing 18-5. RetrieveText.vb Imports Imports Imports Imports Microsoft.VisualBasic System System.Data System.Data.SqlClient
Namespace RetrieveText Public Class RetrieveText Private textFile As String = Nothing Private textChars() As Char = Nothing Private conn As SqlConnection = Nothing Private cmd As SqlCommand = Nothing Private dr As SqlDataReader = Nothing Public Sub New() ' Create connection conn = New SqlConnection("Server=.\sqlexpress;" & _ "Integrated Security=True;Database=tempdb") ' Create command cmd = New SqlCommand("" & ControlChars.CrLf & _ "select" & ControlChars.CrLf & "textfile," & _ ControlChars.CrLf & "textdata" & _ ControlChars.CrLf & "from" & _ ControlChars.CrLf & "texttable" & _ ControlChars.CrLf & "", conn) ' Open connection conn.Open()
CHAPTER 18 s WORKING WITH TEXT AND BINARY DATA
' Create data reader dr = cmd.ExecuteReader() End Sub Public Function GetRow() As Boolean Dim textSize As Long Dim bufferSize As Integer = 100 Dim charsRead As Long textChars = New Char(bufferSize - 1) {} If dr.Read() Then ' Get file name textFile = dr.GetString(0) Console.WriteLine("------ start of file:") Console.WriteLine(textFile) textSize = dr.GetChars(1, 0, Nothing, 0, 0) Console.WriteLine("--- size of text: {0} characters -----", _ textSize) Console.WriteLine("--- first 100 characters in text -----") charsRead = dr.GetChars(1, 0, textChars, 0, 100) Console.WriteLine(New String(textChars)) Console.WriteLine("--- last 100 characters in text -----") charsRead = dr.GetChars(1, textSize - 100, textChars, 0, 100) Console.WriteLine(New String(textChars)) Return True Else Return False End If End Function Public Sub endRetrieval() ' Close the reader and the connection. dr.Close() conn.Close() Console.WriteLine("Press Any Key to Continue...........") Console.ReadLine() End Sub Shared Sub Main() Dim rt As RetrieveText = Nothing Try rt = New RetrieveText()
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