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As mentioned, YUI doesn t support method chaining. Many of those who have come to appreciate jQuery s simplicity have found YUI to be cumbersome to work with. Dustin Diaz developed DED|Chain (http://dedchain.dustindiaz.com) to fill that gap by taking the YUI library and extending it to offer chainable methods such as the following: _$('#elementID').on('click', function(){ /* code goes here */ }); This uses _$ much as jQuery uses the $ to enable the retrieval of DOM elements using CSS selectors. In this case, it returns all objects with an ID of elementID (you should have only one) and then attaches an onclick event handler to them. DED|Chain is still early in development, but I want to point it out because it emphasizes one of the key features of JavaScript: it s extremely flexible. Code can easily be extended to offer the features that the core library might not take into account.

employees = (List<Employee>)em.createQuery("SELECT e FROM Employee e") .getResultList(); Employee employee; Order order; Iterator i = employees.iterator(); Iterator j; while (i.hasNext()) { employee = (Employee) i.next(); if (!em.contains(employee)) { return false; } orders = (List<Order>)employee.getOrders(); j= orders.iterator(); while (j.hasNext()) { order = (Order) j.next(); if (!em.contains(order)) { return false; } } } } catch (Exception e) { throw new EJBException(e.getMessage()); } return true; } } To test the updated bean, you might use the JpqlTestServlet servlet shown in Listing 11-4 in the preceding section. Like in the previous example, the checkIfManaged method called within the servlet should return true, thereby proving the order instances are managed by the time they are accessed through an iterator.

Note If an employee instance has no associated order instances, the nested while loop will not be

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As you can see, it has returned the number of rows in the contacts table, grouped by the country column. There are three contacts in the United States and a single contact in Ireland. Now let s look at what the CouchDB view returns (Table 8-4). Table 8-4. Results from the CouchDB View

With so many libraries out there and so many more to come, how can you ever narrow down the field Of course, your choice depends entirely on what you need to accomplish. As discussed at the beginning of this chapter, libraries tend to fall into one of the three major categories: DOM tool, application helper, or widget. You need to consider what you might be building and narrow down the field from there. If you just need to add some interactivity to your blog, such as simple slide effects, you ll want a library that focuses on the core DOM features along with some basic effects. Mootools or jQuery, for example, might be a good fit. If you want to build a web application and need to manipulate data sets along with prototyping a complex user interface, using Prototype along with ExtJS might be a better solution. When looking at any library, be sure to get your hands dirty and take a look at the source. You ll need to have a good understanding of how the library is put together to be able to take advantage of its power. Plus, it ll make it easier to do apples-to-apples comparisons.

executed. However, if you followed the examples from the preceding chapter, you should have some orders associated with employees.

"Ireland" "USA"

Now if you modify the checkIfManaged method so that it, for example, removes an order entity before checking its status, the EntityManager s contains method will then return false when called on that order entity. To see this in action, you might modify the nested while loop in the checkIfManaged method as follows:

Do a search in your favorite search engine to see who s using the library and the types of things they run into. Having a popular community behind it is a good indication of how solid a library it is. You ll also find places you can visit, such as blogs and forums, if you ever run into a problem.

CHAPTER 11 USING JAVA PERSISTENCE QUERY LANGUAGE (JPQL)

Look familiar These results are the same as what was brought back by the SQL statement. You have calculated the number of documents in the contacts database, grouped by the country field.

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