select-in-table.aspx

来自「Professional ASP.NET source code」· ASPX 代码 · 共 116 行

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116 行
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<%@Page Language="C#" debug="true"%>

<%@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>Sorting and Filtering in a DataTable Object</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">Sorting and Filtering in a DataTable Object</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">&nbsp;</div>

<div id="outMessage" runat="server"></div>

<form runat="server">
Sort records: <input type="submit" id="cmdTitle" value="By Title" runat="server" /> &nbsp;
<input type="submit" id="cmdISBN" value="By ISBN" runat="server" /> &nbsp;
<input type="submit" id="cmdDate" value="By Date" runat="server" /><p />
Search within titles: <input type="text" id="txtFind" size="20" runat="server" />
<input type="submit" id="cmdFind" value="Find" runat="server" />
</form>

<div id="outResult" runat="server"></div>

<script language="C#" runat="server">

	void Page_Load(Object sender, EventArgs e)
	{

		// 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

		// declare a variable to hold a DataSet object
		// note that we have to create it outside the try..Catch block
		// as this is a separate block and so is a different scope
		DataSet objDataSet = new DataSet();

		try
		{
			// create a new Connection object using the connection string
			OleDbConnection objConnect = new OleDbConnection(strConnect);

			// create a new DataAdapter using the connection object and select statement
			OleDbDataAdapter objDataAdapter = new OleDbDataAdapter(strSelect, objConnect);

			// fill the dataset with data from the DataAdapter object
			objDataAdapter.Fill(objDataSet, "Books");
		}
		catch (Exception objError)
		{
			// display error details
			outError.InnerHtml = "<b>* Error while accessing data</b>.<br />"
						+ objError.Message + "<br />" + objError.Source;
			return;  //  and stop execution
		}

		// create the Sorting expression
		string strSortString = "";
		if (Request.Form["cmdTitle"] != null && Request.Form["cmdTitle"].Length > 0)
			strSortString = "Title";
		if (Request.Form["cmdIsbn"] != null && Request.Form["cmdISBN"].Length > 0)
			strSortString = "ISBN";
		if (Request.Form["cmdDate"] != null && Request.Form["cmdDate"].Length > 0)
			strSortString = "PublicationDate DESC, Title";

		// or create the Filter expression
		string strFilterExpr = "";
		if (Request.Form["cmdFind"] != null && Request.Form["cmdFind"].Length > 0)
			strFilterExpr = "Title LIKE '*" + txtFind.Value + "*'";

		// display the parameters we're using
		outMessage.InnerHtml = "Called <b>DataTable.Select</b>('<b>"
						+ strFilterExpr + "</b>', '<b>" + strSortString + "</b>')";

		// get a reference to the "Books" DataTable object
		DataTable objTable = objDataSet.Tables["Books"];

		// create an array to hold the results then call the Select method
		DataRow[] objResults = objTable.Select(strFilterExpr, strSortString);

		// the result is an array of DataRow objects not a DataTable object
		// so we have to iterate through to get the row contents
		string strResult = "<table>";
		foreach (DataRow objRow in objResults)
		{
			strResult += "<tr><td>" + objRow[0] + "</td><td>&nbsp; " + objRow[1]
					+ "</td><td>&nbsp; " + objRow[2] + "</td></tr>";
		}
		strResult += "</table>";

		outResult.InnerHtml = strResult;   // and display the results

	}
</script>

<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>

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