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Wednesday, July 25, 2007

Using Explicit Parameters with the ObjectDataSource control

Wednesday, July 25, 2007 2:02:49 PM (Eastern Standard Time, UTC-05:00) ( ASP.NET )

The order of the parameters does not matter - just the names of the parameters. You can specify the type of a parameter using the Type property - Int32, Decimal and DateTime.

Here is a demo of this code.

*** Movies.vb ***

Imports System.Web.Configuration

Public Class Movies

Private ReadOnly _conString As String

Public Sub UpdateMovie(ByVal id As Integer, ByVal title As String, &_
ByVal director As String, ByVal dateReleased As DateTime)
' Create Command
Dim con As New SqlConnection(_conString)
Dim cmd As New SqlCommand()
cmd.Connection = con
cmd.CommandText = "UPDATE Movies SET Title=@Title,Director=@Director,DateReleased=@DateReleased WHERE Id=@Id"

' Add parameters
cmd.Parameters.AddWithValue("@Title", title)
cmd.Parameters.AddWithValue("@Director", director)
cmd.Parameters.AddWithValue("@DateReleased", dateReleased)
cmd.Parameters.AddWithValue("@Id", id)

' Execute command
Using con
con.Open()
cmd.ExecuteNonQuery()
End Using
End Sub

Public Function GetMovies() As SqlDataReader
' Create Connection
Dim con As New SqlConnection(_conString)

' Create Command
Dim cmd As SqlCommand = New SqlCommand()
cmd.Connection = con
cmd.CommandText = "SELECT Id,Title,Director,DateReleased FROM Movies"

' Return DataReader
con.Open()
Return cmd.ExecuteReader(CommandBehavior.CloseConnection)
End Function

Public Sub New()
_conString = WebConfigurationManager.ConnectionStrings("MyDatabase").ConnectionString
End Sub

End Class

*** ExplicitShowMovies.aspx ***

<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Movies</title>
</head>
<body>
<form id="form1" runat="server">
<div>

<asp:GridView
id="grdMovies"
DataSourceID="srcMovies"
DataKeyNames="Id"
AutoGenerateEditButton="true"
Runat="server" />

<asp:ObjectDataSource
id="srcMovies"
TypeName="Movies"
SelectMethod="GetMovies"
UpdateMethod="UpdateMovie"
Runat="server">
<UpdateParameters>
<asp:Parameter Name="title" />
<asp:Parameter Name="director" />
<asp:Parameter Name="dateReleased" Type="DateTime" />
<asp:Parameter Name="id" Type="Int32" />
</UpdateParameters>
</asp:ObjectDataSource>

</div>
</form>
</body>
</html>

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