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Now type the XML markup shown in Listing 11-16 in the Web.sitemap file. Listing 11-16. Contents of the Web.sitemap File < xml version="1.0" encoding="utf-8" > <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" > <siteMapNode url="default.aspx" title="Home" description="My Web Site"> <siteMapNode url="~/products/default.aspx" title="Products"> <siteMapNode url="~/products/product1.aspx" title="First Product" /> <siteMapNode url="~/products/product2.aspx" title="Second Product" /> </siteMapNode> <siteMapNode url="~/services/default.aspx" title="Services"> <siteMapNode url="~/services/service1.aspx" title="First Service" /> <siteMapNode url="~/services/service2.aspx" title="Second Service" /> </siteMapNode> <siteMapNode url="contact.aspx" title="Contact Us" /> </siteMapNode> </siteMap> The site map file contains a set of predefined tags and attributes. The root node of a site map file is <siteMap>. It further contains several <siteMapNodes> tags depending on your website structure. The <siteMapNode> tag has four important attributes. They are listed in Table 11-1. Table 11-1. Attributes of a Site Map Node

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much more sophisticated than something like a recordset or table because it can support a collection of tables, relationships, constraints, and more. ADO.NET supplies you with a number of built-in providers, including a SQL Server provider that is optimized for SQL Server. This includes all of the preceding classes

JFreeChart chart = createChart(dataset); String filename = PortletUtilities.saveChartAsPNG(chart, 400, 300, session); writer.write("<H1>IT Expenditures Chart</H1>"); String chartServlet = request.getContextPath() + "/servlet/DisplayChart"; writer.write( "<IMG SRC='" + chartServlet + " filename=" + filename + "'"); } protected PieDataset createDataset() { DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue("Software", 65.2); dataset.setValue("Services", 20.1); dataset.setValue("Hardware", 17.3); dataset.setValue("Network", 18.9); dataset.setValue("Recruiting", 1.3); dataset.setValue("Training", 2.8); dataset.setValue("Turnover", 1.2); dataset.setValue("Corporate Initiatives", 0.5); return dataset; } protected JFreeChart createChart(PieDataset dataset) { JFreeChart chart = null; String title = "IT Expenditures 2003"; chart = ChartFactory.createPieChart3D(title, dataset, true, false, false); return chart; } }

Indicates the title of the page. This attribute is often used by navigational controls to display the title for the URL. Indicates the URL of the page that this node represents. Specifies the description of the destination page. You can use this description to show ToolTips. While using security trimming, this attribute specifies the roles that are allowed to access this page.

The portlet uses our PortletUtilities class to save the chart to disk as a PNG file. The DisplayChart servlet serves the image to the user. The portlet s content fragment contains an <IMG> HTML element that references the DisplayChart servlet, and passes the servlet a parameter named filename that contains the name of the chart in the temporary file directory. Figure 14-8 shows the third pie chart our portlet creates.

(Connection, Command, etc) that are written specifically for this database In addition to this, there is also an Object Linking and Embedding for Databases (OLEDB) provider and an Open Database Connectivity (ODBC) provider, which are written to access any database that provides OLEDB or ODBC databases, respectively Although these aren t optimized for a database such as SQL Server, they will still work For older versions of SQL Server that do not support the ADONET provider (earlier than 70), they provide a viable option The built-in set of providers is rounded out with an Oracle provider, which is optimized for Oracle databases The recommendation if you are using Oracle or SQL Server is to use their dedicated providers, due to the optimization inherent in them Should this not work, OLEDB is recommended, and then the ODBC provider as a final fallback option.

Note Security trimming is a feature that implements role-based security by rendering only the nodes that are allowed for the current user. In other words, a particular <siteMapNode> will be accessible to a user only if the user s role is specified in the roles attribute of the <siteMapNode> element.

Summary

You are, of course, not limited to these providers, and a third-party ecosystem of providers around databases such as MySQL and PostGreSQL has evolved Take note that these providers form dependencies that you ll need to account for when you deploy your application Despite the fact that you use different providers for different databases or versions of databases, the API has been carefully designed to avoid fragmentation Each provider is built upon a standard set of interfaces that ensure that the method signatures for standard operations such as open and close are preserved Because of this, your application data access code is buffered from change if you switch databases We ll go into ADONET programming a little later in this chapter, but first, it s a good idea to get a copy of SQL Server.