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Listing 11-2. A Servlet That You Might Use to Test the JpqlTestBean Session Bean Shown in Listing 11-1 package ejbjpa.servlets; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import javax.ejb.EJB; import java.util.List; import java.util.Iterator; import ejbjpa.entities.*; import ejbjpa.ejb.*; public class JpqlTestServlet extends HttpServlet { @EJB private JpqlTest jpqlTest; public void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setBufferSize(8192); PrintWriter out = response.getWriter(); try{ List<Employee> employees = jpqlTest.getEmployees(); Iterator i = employees.iterator(); Employee employee; while (i.hasNext()) { employee = (Employee) i.next(); out.println("Employee id: "+ employee.getEmpno() +"<br/>"); out.println("First name: "+ employee.getFirstname() +"<br/>"); out.println("Last name: "+ employee.getLastname() +"<br/>"); out.println("----------"+ "<br/>"); } } catch (Exception e){ e.printStackTrace(); } } } In the JpqlTestServlet servlet, you make a call to the JpqlTestBean s getEmployees method and then use an Iterator instance to navigate through the retrieved list of employee entity instances, displaying the values of their fields. If you have populated the employees table with data as shown in Listing 6-5 back to 6, the previous servlet should generate the following output: Employee id: 1 First name: Serg Last name: Oganovich ----------

The easiest way to create a permanent view in Futon is to first create a temporary view as described in the previous section. When you are happy with the results your view returns, you can use the Save As button, found in the Reduce Function column, to save your view as a design document in the database. To see this in action, let s save the view you created to return the names and phone numbers of only those contacts with fax numbers in the previous section. In the temporary view builder page, make sure the Map Function column contains the code from Listing 7-3, and check that it works as expected by clicking the Run button. If the results look correct, save the view as a design document by clicking the Save As button.

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Ajax originally stood for Asynchronous JavaScript and XML, but it has morphed into an umbrella term that encapsulates a number of technologies. At the core of Ajax, though, is still the idea of using JavaScript to communicate with the server to send and receive data without having to refresh the page. This is done using the XMLHttpRequest object, often referred to as the XHR object. The XHR object was originally created by Microsoft as an ActiveX object back in 2000. Mozilla went on to create a native implementation of XHR in 2002; since then, Safari and Opera have added support for it. Ajax in itself is fairly straightforward, but handling all the contingencies might not be obvious. JavaScript libraries provide a framework for handling successful calls and problem calls (timeouts, for example). 5 will discuss Ajax in more detail.

CHAPTER 11 USING JAVA PERSISTENCE QUERY LANGUAGE (JPQL)

Employee id: 2 First name: Maya Last name: Silver ----------

Figure 7-6. Save View As dialog box In the Save View As dialog box that appears, as shown in Figure 7-6, save the view to the design document contacts (_design/contacts), and give it a name such as get_fax_contacts. When you re ready, click the Save button to persist the view to a design document.

When you work with Ajax-based web applications, you frequently take data that has been received from the server and place it on the page somehow. The quickest way to do it is to receive a full HTML snippet from the server and just plunk it on the page. However, that process isn t very practical. You end up using a lot of bandwidth just to send a little bit of data. Templating solves this problem by enabling data received from the server to be quickly merged with a template and then embedded in the page. Additionally, web programming constantly uses strings, and having ways to filter, capitalize, or camel case strings can be extremely handy. Here s an example using Prototype to combine a data set with a template to create a list of links:

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