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ItemsPerPage returns an Integer defining how many items should be shown per page. This is only applicable for reports using pagination. If each page should contain 10 items, then return 10. If each page should contain 20 items, then return 20. The last method, SetSortExpression, accepts a SqlQuery object and a sort expression. Its job is to set up the appropriate ORDER BY clause for the SqlQuery object. It doesn t need to worry about reversing the sort order based on the sort direction because ReportFramework handles that automatically. The easiest way to set up the ORDER BY clause is to use a SELECT CASE statement to determine the CASE of the incoming sortExpression and to set the ORDER BY clause accordingly. You can see in the preceding code that each case has its own unique ORDER BY clause. Also, you should always include a default CASE in the event the sortExpression is an invalid value. In the preceding example, the query uses the sort order in the default case when a user clicks on the CustomerID column because the CustomerID column s sort expression is not handled by any other Case statements.

Figure 1-3. Choosing Check for Updates from the Eclipse 3.5 (Galileo) workbench s Help menu 2. In the Available Software window, shown in Figure 1-4, click the Add button to install new software.

Now you have a working Report Page, so go ahead and run it so you can play around with the different pieces of functionality. The simple search form appears by default, but you can toggle between the simple and advanced search forms by using the link button that appears under the search form. Click on the Search button. The results of the search are displayed in sets of 10 on the Report Page. Use the paging navigation to move to the next page, the previous page, and to a page in the middle. You can enter criteria in the search form to filter the search. Make sure to take a look at the total number of records being displayed and the page count information as you update the query. You should also click on a couple of column headings to see the sorting capabilities. Make sure you click on a column heading twice to see the report sort by the column in ascending and descending order. You may also want to view the page source and look at the ViewState size. Notice that it does have some data, but it remains fairly manageable as you navigate through the report. If you happen to have a utility that shows the total number of database requests being processed, then you can see how overriding the BindInPreLoad property can help database performance. Run a search and make sure you navigate through each page of data. Take note of how many database requests were processed. Then override the BindInPreLoad property and make sure it returns False. Execute the same search and navigate through each page of data. Compare the number of database requests.

Summary

For example, we can pass the configuration file and configuration class respectively to the Java runtime with the following commands: java -Dlog4j.configuration=config file yourApp java -Dlog4j.configurationClass=config class yourApp

Figure 1-4. Choosing to add software 3. In the Add Site dialog box, enter Android for the name and https://dl-ssl. google.com/android/eclipse for the location, as shown in Figure 1-5.

In this chapter, you learned that developing against a reporting framework helps you make reports quicker, more accurately, and with more consistency. You learned how to make search forms and how to toggle between a simple and advanced search form using the reporting framework. You also built a reusable paging component that is far superior to the built-in paging component available on the GridView control. Plus, you explored the performance to functionality trade-offs regarding data binding in the PreLoad versus the PreRender method, and you saw how to allow for either scenario using the BindInPreLoad property.

Creating a reusable reporting framework takes a lot of time, effort, and thought, but it definitely pays off in the long run. No doubt, you ll continue to create search pages reports, so you might as well not reinvent the wheel each time you do. This chapter has given you a better understanding of the thought process and design considerations that go into building reusable components and frameworks for reporting.

We will now see how to write a small program that will print very basic logging information with the help of a Logger object. We will create our own configuration properties file as defined in Listing 2-3, give it the name log4j.properties, and pass it to the Java runtime as a system property.