📄 datareader-oledb.aspx
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<%@Page Language="C#"%>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.OleDb" %>
<%@ Register TagPrefix="wrox" TagName="connect" Src="..\global\connect-strings.ascx" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head>
<title>The .NET OleDbDataReader and OleDbConnection Objects</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">The .NET OleDbDataReader and OleDbConnection Objects</span><hr />
<!--------------------------------------------------------------------------->
<%-- insert connection string script --%>
<wrox:connect id="ctlConnectStrings" runat="server"/>
<div>Connection string: <b><span id="outConnect" runat="server"></span></b></div>
<div>SELECT command: <b><span id="outSelect" runat="server"></span></b></div>
<div id="outError" runat="server"> </div>
<div id="outResult" runat="server"></div>
<script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
// declare a string to hold the results as an HTML table
string strResult = "<table>";
// get connection string from ..\global\connect-strings.ascx user control
string strConnect = ctlConnectStrings.OLEDBConnectionString;
outConnect.InnerText = strConnect; // and display it
// specify the SELECT statement to extract the data
string strSelect = "SELECT * FROM BookList WHERE ISBN LIKE '1861003%'";
outSelect.InnerText = strSelect; // and display it
try
{
// create a new Connection object using the connection string
OleDbConnection objConnect = new OleDbConnection(strConnect);
// open the connection to the database
objConnect.Open();
// create a new Command using the connection object and select statement
OleDbCommand objCommand = new OleDbCommand(strSelect, objConnect);
// declare a variable to hold a DataReader object
OleDbDataReader objDataReader;
// execute the SQL statement against the command to fill the DataReader
objDataReader = objCommand.ExecuteReader();
// iterate through the records in the DataReader getting field values
// the Read method returns False when there are no more records
while (objDataReader.Read())
{
strResult += "<tr><td>" + objDataReader["ISBN"] + "</td><td> "
+ objDataReader["Title"] + "</td><td> "
+ objDataReader["PublicationDate"] + "</td></tr>";
}
// close the DataReader and Connection
objDataReader.Close();
objConnect.Close();
}
catch (Exception objError)
{
// display error details
outError.InnerHtml = "<b>* Error while accessing data</b>.<br />"
+ objError.Message + "<br />" + objError.Source;
return; // and stop execution
}
// add closing table tag and display the results
strResult += "</table>";
outResult.InnerHtml = strResult;
}
</script>
<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>
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