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Then, add the following required settings to your Django settings file: CACHE_MIDDLEWARE_SECONDS: The number of seconds each page should be cached. CACHE_MIDDLEWARE_KEY_PREFIX: If the cache is shared across multiple sites using the same Django installation, set this to the name of the site, or some other string that is unique to this Django instance, to prevent key collisions. Use an empty string if you don t care. The cache middleware caches every page that doesn t have GET or POST parameters. That is, if a user requests a page and passes GET parameters in a query string, or passes POST parameters, the middleware will not attempt to retrieve a cached version of the page. If you intend to use the per-site cache, keep this in mind as you design your application; don t use URLs with query strings, for example, unless it is acceptable for your application not to cache those pages. The cache middleware supports another setting, CACHE_MIDDLEWARE_ANONYMOUS_ONLY. If you ve defined this setting, and it s set to True, then the cache middleware will only cache anonymous requests (i.e., those requests made by a non-logged-in user). This is a simple and effective way of disabling caching for any user-specific pages, such as Django s admin interface. Note that if you use CACHE_MIDDLEWARE_ANONYMOUS_ONLY, you should make sure you ve activated AuthenticationMiddleware and that AuthenticationMiddleware appears before CacheMiddleware in your MIDDLEWARE_CLASSES.

You sometimes need this (apparently) superfluous grouping on additional columns. For example, suppose you want to see the employee number and the employee name, followed by the total number of course registrations. The query in Listing 8-32, which could be a first attempt to solve this problem, produces an Oracle error message. Listing 8-32. Error Message: Not a GROUP BY Expression e.empno, e.ename, count(*) employees e join registrations r on (e.empno = r.attendee) group by e.empno; select e.empno, e.ename, count(*) * select from

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Keeping our model classes free of persistence details, as we have in this chapter s version of the SRS, yields two very important advantages: First, as we ve discussed previously, our model classes are much more reusable across applications if they contain only the essence of the abstraction they were intended to serve as in the first place. For example, if our university later wishes to develop an Alumni Relations System, as an example, they ll be able to reuse our Student class (repeated here) as is because it is generic code: import java.util.ArrayList; import java.util.Collection; public class Student extends Person { // Attributes. private String major; private String degree; private Transcript transcript; private ArrayList<Section> attends; // Constructor(s). public Student(String name, String ssn, String major, String degree) { ... } public Student(String ssn) { ... } // Accessor (get/set) methods - details omitted. // Miscellaneous other methods. public void display() { ... } public String toString() { ... }

public public public public public public public }

Finally, note that CacheMiddleware automatically sets a few headers in each HttpResponse: It sets the Last-Modified header to the current date/time when a fresh (uncached) version of the page is requested. It sets the Expires header to the current date/time plus the defined CACHE_MIDDLEWARE_ SECONDS. It sets the Cache-Control header to give a maximum age for the page, again from the CACHE_MIDDLEWARE_SECONDS setting.

ERROR at line 1: ORA-00979: not a GROUP BY expression The pseudo-intermediate result in Listing 8-33 explains what went wrong here, and why you must also group on e.ENAME. Listing 8-33. Pseudo-Intermediate GROUP BY Result GROUP BY e.EMPNO e.EMPNO ======= 7369 7499 7521 7566 e.ENAME ========= {'SMITH'} {'ALLEN'} {'WARD' } ... e.INIT ... ====== {'N'} {'JAM'} ... GROUP BY e.EMPNO,e.ENAME e.EMPNO ======= 7369 7499 7521 ... e.ENAME ======== 'SMITH' 'ALLEN' ... e.INIT ... ====== {'N'} {'JAM'} ...

void displayCourseSchedule() { ... } void addSection(Section s) { ... } void dropSection(Section s) { ... } boolean isEnrolledIn(Section s) { ... } boolean isCurrentlyEnrolledInSimilar(Section s1) { ... } void printTranscript() { ... } Collection<Section> getEnrolledSections() { ... }

Just as important, we can totally change the persistence mechanism of this (SRS) application, and the application as a whole will be oblivious to such changes only the SRSDataAccess class will need to change thanks to the power of encapsulation. To graphically illustrate this latter advantage of model data access layer separation, let s explore what it would take to retrofit the SRS application with relational database persistence.

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