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Note that we ll be both reading from and writing to the xxx-xx-xxxx.dat files representing student information, but we ll only be reading from the other data files: CourseCatalog.dat, Faculty.dat, Soc_SP2005.dat, Prerequisites.dat, and TeachingAssignments.dat. Why is this We re not worried about persisting information about any other type of object besides Student objects because we assume that the rest of the data is unchanging. That is, during a particular SRS session, a student user will not be able to alter Professor or Course information; all a student user will be able to do is to add or drop classes (sections) from his or her course load. Such activity changes the status of the links between a Student and various Section objects, which are stored as secondary records in the student s data file, hence the need to be able to write to these files. Note that we aren t giving student users the ability to change their primary information name, ssn, etc. via the SRS. I ll leave that up to you to tackle as an optional end-of-chapter exercise (see exercise 4).

Note As you can see, the rows in Listing 8-16 are ordered on the columns of the GROUP BY clause. However, if you want a certain ordering of your query results, you should never rely on implicit DBMS behavior and always specify an ORDER BY clause.

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In order to run properly, applications often require information pertaining to their external environment, for example: The names of external files to be accessed, such as the various SRS data files that we ve been discussing The URL of a database server to establish a connection to User-specific profile data to control program execution and so forth. Such information is liable to change over time, as the underlying computer system s infrastructure of an application changes. Thus, rather than hard-coding such information in the source code for a program, it is better to feed such information to an application as data at run time. You learned how to pass information into a program in the form of command-line arguments in 13, which is certainly one way to provide this sort of environmental information to an application. Using command-line arguments, however, is only practical when we have but a few items of information to pass along. The Java Properties class, part of the java.util package, provides us with a convenient alternative way of providing such information to an application in the form of name/value pairs known as properties that can be read from a simple text file. When used in this fashion, we refer to such a file as a properties file. Specifically, rather than hard-coding the name of a given SRS data file as a String literal argument to the FileReader (or FileOutputStream) constructor, as follows: BufferedReader bIn = new BufferedReader(new FileReader("faculty.dat")); we ll initialize the values of String variables with the appropriate file names as read from a properties file:

More formally, the password attribute of a User object is a string in this format: hashtype$salt$hash That s a hash type, the salt, and the hash itself, separated by the dollar sign ($) character. hashtype is either sha1 (default) or md5, the algorithm used to perform a one-way hash of the password. salt is a random string used to salt the raw password to create the hash, for example: sha1$a1976$a36cc8cbf81742a8fb52e221aaeab48ed7f58ab4 The User.set_password() and User.check_password() functions handle the setting and checking of these values behind the scenes.

If a column expression on which you apply the GROUP BY clause contains null values, these null values end up together in a separate group. See Listing 8-17 for an example.

// Pseudocode. String scheduleFileName = read value from the Filenames.properties file; String facultyFileName = read value from the Filenames.properties file; String courseFileName = read value from the Filenames.properties file; // etc. and we ll then pass such variables in as arguments to the FileReader/FileOutputStream constructors instead: BufferedReader bIn = new BufferedReader(new FileReader(scheduleFileName));

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