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Always returns True for real User objects. This is a way to tell if the user has been authenticated. This does not imply any permissions, and it doesn t check if the user is active. It only indicates that the user has successfully authenticated. Returns True only for AnonymousUser objects (and False for real User objects). Generally, you should prefer using is_authenticated() to this method. Returns the first_name plus the last_name, with a space in between. Sets the user s password to the given raw string, taking care of the password hashing. This doesn t actually save the User object. Returns True if the given raw string is the correct password for the user. This takes care of the password hashing in making the comparison. Returns a list of permission strings that the user has through the groups he or she belongs to. Returns a list of permission strings that the user has, both through group and user permissions. Returns True if the user has the specified permission, where perm is in the format "package.codename". If the user is inactive, this method will always return False. Returns True if the user has all of the specified permissions. If the user is inactive, this method will always return False. Returns True if the user has any permissions in the given appname. If the user is inactive, this method will always return False. Returns a list of Message objects in the user s queue and deletes the messages from the queue. Sends an email to the user. This email is sent from the DEFAULT_ FROM_EMAIL setting. You can also pass a third argument, from_email, to override the From address on the email. Returns a site-specific profile for this user. See the Profiles section for more on this method.

DEPTNO -------10 10 10 20 20 20 20 20 30

The code involved with reading from a file is liable to throw various types of run-time Exception. We ll discuss this in a moment with regard to both reading from and writing to files.

is_anonymous()

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The basic Java approach that we ll use for writing records to a text file is similar, but in reverse, to what it takes to read from a file: 1. We instantiate a FileOutputStream, an object that knows how to open a file and write data to the file one character at a time. 2. We pass a reference to that FileOutputStream object as an argument to the constructor for a PrintWriter, a more sophisticated type of object that encapsulates the FileOutputStream. The PrintWriter s println method knows how to transfer an entire record/line s worth of data one character at a time to its encapsulated FileOutputStream object, which then outputs the data one character at a time to the file. This is depicted conceptually in Figure 15-5. Both the FileOutputStream and PrintWriter classes are defined in the java.io package.

30 30 30 30 30

The PrintWriter class also defines a print method, which works exactly like the System.out.print method.

get_full_name() set_password(passwd) check_password(passwd)

Figure 15-5. A BufferedWriter uses an encapsulated FileOutputStream to write records, character by character, to a file.

The result in Listing 8-11 shows no rows for department 40, for an obvious reason: that department does exist in the DEPARTMENTS table, but it has no corresponding employees. In other words, if tuple variable d refers to department 40, there is not a single row e in the EMPLOYEES table to make the WHERE clause evaluate to TRUE. If you want the fact that department 40 exists to be reflected in your join results, you can make that happen with an outer join. For outer joins in Oracle, you can choose between two syntax options: The old outer join syntax, supported by Oracle since many releases, and implemented many years before the ANSI/ISO standard defined a more elegant outer join syntax The ANSI/ISO standard outer join syntax

Here is a bit of pseudocode to illustrate the basics of writing to a file: // Instantiate a FileOutputStream, and pass it into a PrintWriter. FileOutputStream fos = new FileOutputStream(nameOfFileToBeWrittenTo); PrintWriter pw = new PrintWriter(fos); while (we still have more data to output) { pw.println(whatever data we wish to output); } // Close the PrintWriter, which automatically closes // the encapsulated FileOutputStream, as well. pw.close(); Here are a few points worth noting about the preceding code: Note that the following two lines of code: FileOutputStream fos = new FileOutputStream(nameOfFileToBeWrittenTo); PrintWriter pw = new PrintWriter(fos); could also be combined into a single statement as follows: PrintWriter pw = new PrintWriter( new FileOutputStream(nameOfFileToBeWrittenTo)); because we ll never need to reference (i.e., talk to ) the FileOutputStream object directly.

get_group_permissions() get_all_permissions() has_perm(perm)

We will discuss an example of both outer join syntax variants, based on the regular join in Listing 8-11.

It s important to explicitly close a PrintWriter/FileOutputStream combination when we are through with it, to completely flush the data that we ve been writing out to the file In the following example, we ve inadvertently forgotten to close the file with a pwclose(); statement: import javaio*; public class ForgotToClose { public static void main (String[] args) { PrintWriter pw = new PrintWriter( new FileOutputStream("testdat")); pwprintln("Hi"); // Whoops! } } If we were to run the preceding program, we d discover that a testdat file would have been created, but we d find it to be empty The code involved with writing to a file is liable to throw one of two types of Exception We ll discuss exception handling in a moment with regard to both reading from and writing to files.

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