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How to handle Database Nulls in a DataReader


Posted Date: 03 May 2008    Resource Type: Articles    Category: Databases
Posted By: andy robarts       Member Level: Gold
Rating:     Points: 0



<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDB" %>
<html>
<head>
<meta name="GENERATOR" Content="ASP Express 2.2">
<title>Handling Database Nulls with a DataReader</title>
<script language="VB" runat="server">
Sub Page_Load(Source as Object, E as EventArgs)
Dim strConn as string = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" _
& server.mappath(".\BIBLIO.MDB") & ";"
Dim MySQL as string = "Select author, [Year Born] from Authors"
Dim MyConn as New OleDBConnection(strConn)
Dim objDR as OleDBDataReader
Dim Cmd as New OLEDBCommand(MySQL, MyConn)
MyConn.Open()
objDR=Cmd.ExecuteReader(system.data.CommandBehavior.CloseConnection)
MyDataList.DataSource = objDR
MyDataList.DataBind()
End Sub

Function fixBirthDate(sItem) as String
if sItem is System.DBNull.Value Then
fixBirthDate="<i><font Color='#FF0000'>No Date Specified</font></i>"
else
fixBirthDate="<b>" & sItem & "</b>"
End If
End function

</script>
</head>
<body>

<asp:DataList runat="server"
Id="MyDataList"
GridLines="Both"
cellpadding="2"
cellspacing="2"
Headerstyle-Font-Name="Arial"
Headerstyle-Font-Size="8"
Font-Name="Arial"
Font-Bold="false"
RepeatDirection="Horizontal"
RepeatColumns="4"
Font-Size="8">
<ItemTemplate>
<%# Container.DataItem("Author")%> -
<%# fixBirthDate(Container.DataItem("YearBorn"))%>
</ItemTemplate>
</ASP:DataList>

</body>
</html>



Responses
Author: Sebastian    13 Jun 2008Member Level: Gold   Points : 1
This is very informative. Thanks for sharing the details.


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