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Figure 3-4. Xcode developer tools disk image The Xcode Tools Installer will now load, and you can click the Continue button to begin the install. On the screen that follows, click the Continue button once again, which will pop up a confirmation dialog box, asking you to agree to the terms of the software license agreement. Click Read License to read these terms, and once you are satisfied, click the Agree button to move on. On the Custom Install on Macintosh HD screen, you can accept the default selections and click the Continue button to advance to the next screen. If you want to change the location where Xcode will be installed, you can click the Change Install Location button here; otherwise, simply click Install to begin the installation procedure. You will now be asked for your Mac OS X system password. Enter it (if you have one), and click OK to continue. The installation procedure will now begin, and depending on your hardware, the process should take approximately ten minutes. When the installation process has completed, you should see something similar to the screen shown in Figure 3-5.

As mentioned, you ve already seen how to establish both unidirectional and bidirectional relationships in 4. To recap, to define a relationship between two entities, you apply an appropriate relationship modeling annotation to the corresponding persistent field or property in the referencing entity. In the case of a bidirectional relationship, an appropriate annotation is applied to each side of the relationship. The example discussed in this section illustrates how you can navigate from one related entity to the other via a one-to-many/many-to-one bidirectional relationship, using the relationship between the Customer and Order entities discussed in the preceding examples. Like in the example in the earlier Specifying Mapping Metadata in orm.xml section, you might use the test project discussed in the Performing a Quick Test of the Newly Created JPA Entities section in the preceding chapter as a starting point for the new project being discussed here. Again, you might borrow the directory structure from the test project, adjusting the configuration details in the XML files and implementing, this time, the RelationshipTestServlet servlet in the src/ejbjpa/servlets directory. Before you start coding the RelationshipTestServlet servlet, though, let s do a little planning and look at the steps it is supposed to perform: 1. Get a Customer instance from a database, as well as an Employee instance, using the find method of the EntityManager instance injected into the servlet. 2. Create two Order instances, and then set their Customer and Employee fields to the instances obtained in step 1.

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3. Persist the Order instances created in step 2. 4. Synchronize the Order instances to the database with flush. 5. Refresh the Customer instance from the database. 6. Create an ArrayList, and then populate it with the Order instances, using the getOrders method of the Customer instance refreshed from the database in step 5. 7. Make sure that the Order instances created in step 2 have been successfully obtained through the Customer instance, accessing those Order instances via the ArrayList created in step 6. Now that you know what exactly the RelationshipTestServlet servlet is going to do, you can start writing the code. Listing 9-4 shows what the source code for this servlet might look like. Listing 9-4. Source Code for a Servlet That Illustrates How You Can Navigate from One Entity to Another Through the Relationship Established Between Them package ejbjpa.servlets; import java.io.*; import java.util.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import javax.transaction.*; import javax.annotation.Resource; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.PersistenceUnit; import java.util.List; import ejbjpa.entities.*; public class RelationshipTestServlet extends HttpServlet { @PersistenceUnit private EntityManagerFactory emf; @Resource private UserTransaction userTransaction; public void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setBufferSize(8192); PrintWriter out = response.getWriter(); EntityManager em= emf.createEntityManager(); //Creating the order entity instances Customer cust = (Customer) em.find(Customer.class, 2); Employee emp = (Employee) em.find(Employee.class, 1); List<Order> orders = new ArrayList<Order>(); Order order1 = new Order();

I am going to show how to install CouchDB using an excellent, open source package manager for Mac OS X called MacPorts. Unfortunately, MacPorts is not included as part of Mac OS X, and therefore you need to install it before you can use it to install CouchDB. You will install MacPorts by downloading the latest binary package from the MacPorts project web site. Before beginning, please ensure that you have installed Xcode (see the previous section for detailed instructions on how to do this), because some of its components are required in order to install MacPorts. Let s dive in and get MacPorts up and running on your system. Open your favorite webs browser, and visit the Installing MacPorts page on the MacPorts project web site: http://www.macports.org/install.php This page should look something like the one shown in Figure 3-6.

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