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The portlet request s context path is the part of the URL that corresponds to the portlet s context. For instance, if the URL is http://localhost/portal/ MyPortletApp/MyPortlet, the context path would be /MyPortletApp. If there is a trailing slash on the end of the path, the trailing slash is not part of the context path. If you deploy the portlet application in such a way that it is accessible as the web root (http://localhost:8520/), the request will return an empty string for the context path.

} SqlDataAdapter da = new SqlDataAdapter(); daSelectCommand = cmd; DataSet ds = new DataSet(); daFill(ds); return ds; } } Before you start coding the SqlHelper class, make sure to import the SystemData and SystemDataSqlClient namespaces The SqlHelper class consists of a static constructor and three static methods: ExecuteNonQuery(), ExecuteScalar(), and ExecuteDataSet() The constructor of SqlHelper reads the database connection string from the <connectionStrings> section of the webconfig file and stores it in a private static variable This is done with the help of the ConfigurationManager class The ExecuteNonQuery() method is intended for executing action queries such as INSERT, UPDATE, and DELETE The method takes two parameters: the SQL query to be executed and an array of the SqlParameter class representing parameters of the query Then the method creates an instance of SqlConnection and SqlCommand The SqlParameters are added to the Parameters collection.

public String getContextPath()

</StackPanel> <StackPanel x:Name="DockRight" Width="196" Height="Auto" Background="{DynamicResource {x:Static SystemColors.MenuBarBrushKey}}" DockPanel.Dock="Right"> <Label Content="Label"/> <Label Content="Label"/> <Button Content="Button"/> <Button Content="Button"/> <Button Content="Button"/> </StackPanel> <RichTextBox x:Name="txtEdit"> <FlowDocument> <Paragraph><Run>RichTextBox</Run></Paragraph> </FlowDocument> </RichTextBox> </DockPanel> </Window>

The database connection is then opened and the query is executed by using the ExecuteNonQuery() method of the SqlCommand object, which returns the number of records affected by the query and is returned to the caller The ExecuteScalar() method is used to execute SELECT queries that return just one value It takes two parameters: the SQL query to be executed and an array of the SqlParameter class representing parameters of the query The pattern is then the same as before: the method creates an instance of SqlConnection and SqlCommand, and SqlParameters are added to the Parameters collection The database connection is then opened and the query is executed by using the ExecuteScalar() method of the SqlCommand object, which returns the result of the query as an object This object is returned to the caller.

The context path is retrieved from the PortletRequest object using the getContextPath() method. This method is analogous to the getContextPath() method on the HttpServletRequest class. Here is a very basic portlet that will display the context path for a portlet application:

When you run this application, you ll see something like that in Figure 8-17. When you resize the window, the layout controls manage the UI for you, with the dock panels filling the top, bottom, left, and right of the screen, and the text area automatically stretching (or shrinking) to fit its bounds.

package com.portalbook.portlets; import javax.portlet.*; import java.io.*;

The ExecuteDataSet() method is used to execute SELECT queries and retrieve the result set as a DataSet It takes two parameters: the SQL query to be executed and an array of the SqlParameter class representing parameters of the query The novel part of this method instantiates a SqlDataAdapter The SelectCommand property of the SqlDataAdapter is set to the SqlCommand instance that we just created The SqlDataAdapter then fills a DataSet with the help of the Fill() method The filled DataSet is then returned to the caller..