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Our portlet will display the available resources for a collection, or it will display the contents of a noncollection resource If you select a collection, the portlet will update its internal pointer to a WebDAV resource, and then display the resources in the collection If you select a file, the portlet will retrieve its contents as a string, and then display them in the portlet window You may also navigate back up the hierarchy with the parent folder link at the bottom of the page We created one portlet class, CMSPortletjava It responds to action requests and render requests The WebDAVHelper class encapsulates the WebDAV functionality WebDAVHelper is a bridge between the portlet and the client library, and it includes some utility methods Our JSP file, ListFilesjsp, uses the portlet and standard JSP tag libraries to display the resources for a collection..

Note that connections are expensive resources on a server, and you should take every precaution to prevent connection leaks, which are orphaned connections. Every time you open a connection, you must close that connection. Therefore, it s best to wrap your data access code in a try...catch block and place the SqlConnection.Close method invocation in a finally block, or create the SqlConnection in a using statement. The using statement will call the connection s Dispose method when it goes out of scope, thereby closing the database connection for you. This way, the connection is assured to be closed, even if your code sustains an error while accessing the data. It is also highly recommended that when developing data applications, you open them as late as possible (i.e., perform all required initialization before you open the connections to your database) and close them as early as possible (i.e., process any resulting DataSet after you close the connection), unless you have to keep the connection open for some compelling reason. The goal here is to minimize the time connections are held open, which serves to increase scalability.

<roleManager enabled="true" defaultProvider="rp"> <providers> <add name="rp" connectionStringName="connectionstring" type="System.Web.Security.SqlRoleProvider"/> </providers> </roleManager> <profile defaultProvider="pp"> <providers> <add name="pp" connectionStringName="connectionstring" type="System.Web.Profile.SqlProfileProvider"/> </providers> <properties> <add name="FullName"/> <add name="DOB" type="System.DateTime"/> <group name="Address"> <add name="Street"/> <add name="State"/> <add name="Country"/> <add name="PostalCode"/> </group> </properties> </profile> ... The markup first specifies a database connection string in the <connectionString> section. It points to the Northwind database and is named connectionstring. The <membership> tag configures the membership provider. The <providers> section of <membership> can contain one or more providers specified by the <add> element, which has the following attributes: The name attribute indicates the name of this provider entry. This name is specified in the defaultProvider attribute of the <membership> tag. The connectionStringName attribute specifies the name of the connection string from the <connectionStrings> section that is to be used. The type attribute specifies the fully qualified name of the membership provider. The SqlMembershipProvider is the default membership provider for SQL Server databases. The <roleManager> section is similar to the <membership> section with a couple of differences. First, the enabled attribute of the <roleManager> tag must be set to true to enable the roles feature. Second, the type attribute of the <add> tag specifies the SqlRoleProvider class.

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A command represents any kind of SQL statement made against your database. This gives you powerful application control over your database structure and contents, enabling you to create and delete databases, insert and retrieve data, and manipulate table structures, among other things. A command is implemented via the SqlCommand class and controlled using the SqlCommand.CommandType and SqlCommand.CommandText properties, which are often used in tandem. If you set the CommandType to CommandType.Text, the CommandText property (a string) should contain the SQL statement that you want to execute. If the type is CommandType. StoredProcedure, the CommandText should contain the name of the stored procedure to execute. Finally, if the type is CommandType.Table, the command text should contain the name

The CMSPortlet class initializes itself from the initialization parameters on the portlet deployment descriptor. Three parameters, URL, username, and password, contain the connection information for the WebDAV server. The doView() method looks at the current WebDAV resource to determine if it is a collection. If it is a collection, it dispatches the request to the ListFiles.jsp page. If it is not a collection, it asks for the contents of the resources as a String, and displays them in the portlet output. We could also have created links in the JSP file that would show the contents of the resources in a new window if the resource was an image, PDF file, or another binary file. The processAction() method looks at the COMMAND parameter and then performs an action based on the command. All of our commands change the current WebDAV resource.