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The file can be found and accessed, and is a tab-delimited text file with the appropriate record format, but one or more data values within a particular record may be invalid For example, we re looking for a numeric value for a student s GPA, but encounter a non-numeric value instead and so forth For some of these errors, the Java language automatically throws predefined exception types (eg, FileNotFoundException); for others that are application specific, we must determine whether or not to explicitly throw either a predefined or a custom type of exception The first custom exception type that we ll define for our SRS application, SRSInitializationException, is derived directly from the predefined Exception class We ll use it to report general issues that might arise when initializing any one of our three custom collections.

The ANSI/ISO SQL standard postulates group functions to ignore null values completely. There is only one exception to this rule: the COUNT(*) function. This special case is discussed later in this section. This is a reasonable compromise. The only other consistent behavior for group functions would be to return a null value as soon as the input contains a null value. This would imply that all your SQL statements (containing group functions) should contain additional code to handle null values explicitly. So, ignoring null values completely is not a bad idea. Just make sure that you understand the consequences of this behavior. See Table 8-2 for some typical examples. Table 8-2. Behavior of Group Functions and Null Values

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This only creates those extra permissions when you run syncdb; it s up to you to check for these permissions in your views. Just like users, permissions are implemented in a Django model that lives in django. contrib.auth.models. This means that you can use Django s database API to interact directly with permissions if you like.

As discussed in 13, we need do only the bare minimum to declare such a custom exception namely, we provide an explicit constructor that enables us to pass in a detailed message to reflect the specifics of what has gone wrong in our application to have warranted throwing the exception in the first place // SRSInitializationExceptionjava public class SRSInitializationException extends Exception { public SRSInitializationException(String message) { super(message); } } Then, we ll derive two specialized forms of SRS exception from the previous code: one to use when we re reading data in about a Student (ie, when we re instantiating a Student object in memory to represent the human user who is currently logged on to the SRS), // InvalidStudentExceptionjava // We throw this type of Exception to signal a problem with regard // to restoring a Student's state from persistent storage..

public class InvalidStudentException extends SRSInitializationException { public InvalidStudentException(String message) { super(message); } } and one to use when we re writing data out about a Student object, based on changes that its human counterpart has made to his or her class schedule while logged on to the SRS: // StudentPersistenceException.java // We throw this type of Exception to signal a problem with regard // to storing a Student's state to persistent storage. public class StudentPersistenceException extends SRSInitializationException { public StudentPersistenceException(String message) { super(message); } } We ll see these three custom exception types in use in the SRSDataAccess class (to be discussed next), where they ll be thrown as signal flares to report issues to our client code, and again in the client code of the SRS driver class s main method, where we ll be catching and responding to such exceptions.

{1,2,3,NULL} {1,2,3,0} {1,2,3,2}

Let s edit this file to expose our current_datetime view: from djangoconfurlsdefaults import * from mysiteviews import current_datetime urlpatterns = patterns('', (r'^time/$', current_datetime), ) We made two changes here First, we imported the current_datetime view from its module (mysite/viewspy, which translates into mysiteviews in Python import syntax) Next, we added the line (r'^time/$', current_datetime), This line is referred to as a URLpattern it s a Python tuple in which the first element is a simple regular expression and the second element is the view function to use for that pattern In a nutshell, we just told Django that any request to the URL /time/ should be handled by the current_datetime view function A few things are worth pointing out: Note that, in this example, we passed the current_datetime view function as an object without calling the function.

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