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Each captured argument is sent to the view as a plain Python string, regardless of what sort of match the regular expression makes. For example, in the following URLconf line: (r'^articles/( P<year>\d{4})/$', views.year_archive), the year argument to views.year_archive() will be a string, not an integer, even though \d{4} will only match integer strings. This is important to keep in mind when you re writing view code. Many built-in Python functions are fussy (and rightfully so) about accepting only objects of a certain type. A common error is to attempt to create a datetime.date object with string values instead of integer values: >>> import datetime >>> datetime.date('1993', '7', '9') Traceback (most recent call last): ... TypeError: an integer is required >>> datetime.date(1993, 7, 9) datetime.date(1993, 7, 9) Translated to a URLconf and view, the error looks like this: # urls.py from django.conf.urls.defaults import * urlpatterns = patterns('', (r'^articles/(\d{4})/(\d{2})/(\d{2})/$', views.day_archive), ) # views.py import datetime def day_archive(request, year, month, day) # The following statement raises a TypeError! date = datetime.date(year, month, day) Instead, day_archive() can be written correctly like this: def day_archive(request, year, month, day) date = datetime.date(int(year), int(month), int(day)) Note that int() itself raises a ValueError when you pass it a string that is not composed solely of digits, but we re avoiding that error in this case because the regular expression in our URLconf has ensured that only strings containing digits are passed to the view function.

Every Java object inherits a method from the Object class with the header Class getClass() This method, when invoked on an object reference for example, x.getClass(); returns a reference to an object of type Class representing an abstraction of the class that object x belongs to. The Class class, in turn, defines a method with the header String getName() This method, when invoked on a Class reference, returns the fully qualified name of the class for classes that belong to a named package (packagename.Classname for example, java.util. ArrayList), or a simple class name for example, Professor for classes that belong to the default (unnamed) package (as will be the case for our SRS classes). Chaining these two methods together, we can ask any object reference to identify which class the object it references belongs to, as follows: reference.getClass().getName(); For example: Professor pr = new Professor(); System.out.println(pr.getClass().getName()); Here s the output: Professor or // // // if Test to see if x is referring to a Professor object. Note that if x were null, we'd get a NullPointerException, so we've inserted a test for "nullness" before calling the getClass method on x. (x != null && x.getClass().getName().equals("Professor")) { ...

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Note The fact that you are able to query and insert into the same table at the same time is due to Oracle s read consistency implementation. See Section 6.6 for details.

When a request comes in, Django tries to match the URLconf patterns against the requested URL, as a normal Python string (not as a Unicode string). This does not include GET or POST

Returning to our discussion of exception handling from earlier in this chapter, we can also use the getClass().getName() approach within a catch block to determine what sort of exception has occurred: try { ... } catch (SomeExceptionType e) { System.out.println("Drat! An exception of type " + e.getClass().getName() + " has occurred."); }

Another way to test whether a given object reference belongs to a particular class is via the instanceof operator. This is a boolean operator that allows us to determine if some reference variable x is referring to an object of class/type Y. Here s a simple code example to illustrate the use of this operator. In this example, we assume that Person is an abstract class, and that both Student and Professor are concrete classes derived from Person: Person x; // Later in the program ... x = new Professor(); // Still later in the program ... // Determine the precise run-time identity of x. if (x instanceof Student) { System.out.println("x is a Student"); } if (x instanceof Professor) { System.out.println("x is a Professor"); } if (x instanceof Person) { System.out.println("x is a Person"); } Here s the output: x is a Professor x is a Person

Listing 6-1 shows four INSERT statement examples: three using the VALUES clause and one using the subquery method.

parameters, or the domain name. It also does not include the leading slash, because every URL has a leading slash. For example, in a request to http://www.example.com/myapp/, Django will try to match myapp/. In a request to http://www.example.com/myapp/ page=3, Django will try to match myapp/. The request method (e.g., POST, GET, HEAD) is not taken into account when traversing the URLconf. In other words, all request methods will be routed to the same function for the same URL. It s the responsibility of a view function to perform branching based on request method.

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