Section A.6. Accessing the Database

A.6. Accessing the Database

The Database Access button first adds a new record to the Database1.mdf database and then retrieves and displays all of the records in the database:

 '===================================================     ' Database Access     '===================================================     Private Sub btnDataAccess_Click( _        ByVal sender As System.Object, _        ByVal e As System.EventArgs) _        Handles btnDataAccess.Click         '---Insert a record into the table---         Dim conn As New SqlConnection _         ("Data Source=.\SQLEXPRESS;AttachDbFilename="&_          "|DataDirectory|\Database1.mdf;Integrated "&_          "Security=True;User Instance=True")         Dim sql As String = _            "INSERT INTO Books (ISBN, Title) VALUES "&_            "('1-23456-123-x','ABC Guide to ClickOnce')"         Dim comm As New SqlCommand(sql, conn)         conn.Open()         Try             Dim rowsAdded As Int16 = comm.ExecuteNonQuery()             MsgBox("Rows added: "&rowsAdded)         Catch ex As Exception             MsgBox(ex.ToString)         End Try         '---Read the just inserted data---         sql = "SELECT * FROM Books"         Dim reader As SqlDataReader         comm.CommandText = sql         reader = comm.ExecuteReader         While reader.Read             MsgBox("ISBN: "&reader("ISBN"))             MsgBox("Title: "&reader("Title"))         End While         conn.Close()     End Sub 

Use ClickOnce to Deploy Windows Applications2006
Use ClickOnce to Deploy Windows Applications2006
Year: 2005
Pages: 38 © 2008-2017.
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