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When displaying the navigation controls, you need to calculate the number of subpages of products you have for a given catalog page; for this, we re creating the HowManyPages helper method. This method receives as argument a SELECT query that counts the total number of products of the catalog page ($countSql) and returns the number of subpages. This will be done by simply dividing the total number of products by the number of products to be displayed in a subpage of products; this latter number is configurable through the PRODUCTS_PER_PAGE constant in include/config.php. To improve the performance when the visitor browses back and forth through the subpages, after we calculate the number of subpages for the first time, we re saving it to the visitor s session. This way, the SQL query received as parameter won t need to be executed more than once on a single visit to a catalog page. This method is called from the other data tier methods (GetProductsInCategory, GetProductsOnDepartment, GetProductsOnCatalog), which we ll cover next. Add HowManyPages to the Catalog class. /* Calculates how many pages of products could be filled by the number of products returned by the $countSql query */ private static function HowManyPages($countSql, $countSqlParams) { // Create a hash for the sql query $queryHashCode = md5($countSql . var_export($countSqlParams, true)); // Verify if we have the query results in cache if (isset ($_SESSION['last_count_hash']) && isset ($_SESSION['how_many_pages']) && $_SESSION['last_count_hash'] === $queryHashCode) { // Retrieve the the cached value $how_many_pages = $_SESSION['how_many_pages']; } else { // Execute the query $prepared = DatabaseHandler::Prepare($countSql); $items_count = DatabaseHandler::GetOne($prepared, $countSqlParams); // Calculate the number of pages $how_many_pages = ceil($items_count / PRODUCTS_PER_PAGE); // Save the query and its count result in the session $_SESSION['last_count_hash'] = $queryHashCode; $_SESSION['how_many_pages'] = $how_many_pages; } // Return the number of pages return $how_many_pages; }

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When executed, Listing 7-6 will log debug messages to object table DEBUG_OT. But before you execute it, you may want to determine your session s unique ID so you can specify that value from a second session in order to filter the debug messages that appear as your program executes. Listing 7-7 is a very short anonymous PL/SQL program to get your session s unique ID. Then when you want to see what s going on with the program from which you re debug logging, you can specify your first session s unique session ID on the SQL*Plus command line when you execute the SQL query from Listing 7-8. Listing 7-7. An Example of How to Get Your Unique Session ID, usi.sql 1 2 3 4 5 rem usi.sql rem by Donald J. Bales on 12/15/2007 rem Show me my unique session ID execute pl('unique_session_id='||SYS.DBMS_SESSION.unique_session_id);

5+5+5=15*10=150

Let s analyze the function to see how it does its job. The method is private because you won t access it from within other classes it s a helper class for other methods of Catalog. The method verifies whether the previous call to it was for the same SELECT query. If it was, the result cached from the previous call is returned. This small trick improves performance when the visitor is browsing subpages of the same list of products because the actual counting in the database is performed only once. // Create a hash for the sql query $queryHashCode = md5($countSql . var_export($countSqlParams, true)); // Verify if we have the query results in cache if (isset ($_SESSION['last_count_hash']) && isset ($_SESSION['how_many_pages']) && $_SESSION['last_count_hash'] === $queryHashCode) { // Retrieve the the cached value $how_many_pages = $_SESSION['how_many_pages']; } The number of pages associated with the received query and parameters is saved in the current visitor s session in a variable named how_many_pages. If the conditions aren t met, which means the results of the query aren t cached, we calculate them and save them to the session: else { // Execute the query $prepared = DatabaseHandler::Prepare($countSql); $items_count = DatabaseHandler::GetOne($prepared, $countSqlParams); // Calculate the number of pages $how_many_pages = ceil($items_count / PRODUCTS_PER_PAGE); // Save the query and its count result in the session $_SESSION['last_count_hash'] = $queryHashCode; $_SESSION['how_many_pages'] = $how_many_pages; } In the end, no matter if the number of pages was fetched from the session or calculated by the database, it is returned to the calling function: // Return the number of pages return $how_many_pages;

For example, if I execute usi.sql in SQL*Plus from my first session, session 1, it reports the following: SQL> @usi.sql unique_session_id=01800B510001 PL/SQL procedure successfully completed. Next, I open a second session, session 2. I execute the following at the SQL> prompt: @debug_ot.sql 01800B510001 Of course, I get no rows selected, because I haven t started my test unit in session 1. So I go back to session 1 and execute the following at the SQL> prompt: @debug_o.sql Then I switch back to session 2 and simply type a forward slash at the SQL> prompt to see the PL/SQL program in session 1 s progress: SQL> @debug_ot.sql 01800B510001 old new 4: where 4: where unique_session_id = upper('&unique_session_id') unique_session_id = upper('01800B510001')

GetProductsInCategory GetProductsInCategory returns the list of products that belong to a particular category. Add the following method to the Catalog class in business/catalog.php:

SQL> / old new 4: where 4: where unique_session_id = upper('&unique_session_id') unique_session_id = upper('01800B510001')

If you enter a formula incorrectly, SharePoint returns an error page that says the following:

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