complex-datareader.aspx

来自「Professional ASP.NET source code」· ASPX 代码 · 共 81 行

ASPX

81 行

<%@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>Extracting Complex Data with a DataReader</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">Extracting Complex Data with a DataReader</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>

<asp:datagrid id="dgrResult" runat="server" />

<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 BookList.*, BookAuthors.FirstName, BookAuthors.LastName "
						+ "FROM BookList INNER JOIN BookAuthors ON BookList.ISBN = BookAuthors.ISBN "
						+ "WHERE BookList.ISBN LIKE '18610033%'";
		outSelect.InnerText = strSelect;   // and display it

		// declare a variable to hold a DataReader object
		OleDbDataReader objDataReader;
		OleDbConnection objConnect;

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

			// create a new Command using the connection object and select statement
			OleDbCommand objCommand = new OleDbCommand(strSelect, objConnect);

			// open the connection and execute the command to return the DataReader
			objConnect.Open();
			objDataReader = objCommand.ExecuteReader();
		}
		catch (Exception objError)
		{
			// display error details
			outError.InnerHtml = "<b>* Error while accessing data</b>.<br />"
				+ objError.Message + "<br />" + objError.Source;
			return;  //  and stop execution
		}

		// assign the DataReader object to the DataGrid control
		dgrResult.DataSource = objDataReader;
		dgrResult.DataBind();  // and bind (display) the data
		objConnect.Close();    // then close the connection

		// finished with the DataReader
		objDataReader.Close();

	}

</script>


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

complex-datareader.aspx - 源码说明

本页面展示了「Professional ASP.NET source code」中的 complex-datareader.aspx 源码文件，采用 ASPX 编程语言编写，共 81 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

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