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Sometimes it may not be desirable that a permanent paper record be created which could cause later confusion An example might be an unveri ed clinical test result that is made available on a display to aid in quick diagnosis but should not become part of the permanent medical record It may be more advisable to identify such preliminary information speci cally rather than to devise separate access keys for hard and soft devices The time and day of access may be a necessary adjunct to the destination parameter in the accessor description A location may be considered secure only during normal o ce hours There also may be a time component to the value of data, so that data of a certain age may be more liberally accessible than very current information The frequency with which an element is accessed may be of concern A sales total may be requested quarterly for the public stockholders report; the same value produced every hour could be correlated with speci c sales activity which a company might wish to keep con dential An unusually high access frequency would generally be indicative of an unusual situation and possibly reveal foul play 12-2-4 Access Key Management To lessen the possibility of theft within the system of accessor keys, a transformation which is not uniquely reversible can be applied to the keys Within the system only the transformed keys are stored and used for access privilege veri cation, so that the original key is visible within the system only for a short time The hashing techniques discussed in Sec 3-5 provide this type of transformation The full number of access keys could be as large as: #(accesskeys) = #(individuals) #(access procedures) #(distinct devices or locations) #(time categories) #(frequency categories)

To make an actual instance, or object, of the Dog class, you must declare the object and allocate memory for the object. These two steps combined are necessary to create, or instantiate, the object. Here s how you do it. First, you declare the object by writing the name of the class (Dog) followed by an identifier (name) for the object or instance of that class:

12-2

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This is not unlike the way you create a local variable; you declare the type (in this case, Dog), followed by the identifier (milo). Notice also that by convention, the identifier for the object is written in Camel notation. Camel notation is just like Pascal notation except that the very first letter is lowercase. Thus, a variable or object name might be myDog, designatedDriver, or plantManager. The declaration alone doesn t actually create an instance, however. To create an instance of a class, you must also allocate memory for the object using the keyword new:

We will discuss in Sec 12-6 methods which can be used to map this set of access keys into a more manageable set of accessor categories or cliques 12-3 TYPES OF DATA ACCESS

You can combine the declaration of the Dog type with the memory allocation into a single line:

Accesses to data can be categorized by type Distinctions are commonly made between authorization to read and authorization to write data Magnetic-tape reels, cartridges, and some disks have inserts which, when removed, make writing physically impossible Some disk drives have write-protect switches Many shared operating systems have added an execute-only privilege Here one can allow an accessor to use a program without allowing reading or copying the program Such a facility provides a protection for the products of programmers The execute-only privilege may in turn protect the data used by a protected program, since its access mechanism and identi cation key is hidden Computer systems limited to these three types of authorization still provide fairly unsatisfactory protection The procedures which are part of the operating

tables and are checked whenever any of these tables is modi ed Both table constraints and assertions can use the full power of SQL queries to specify the desired restriction We discuss SQL support for table constraints and assertions in Section 511 because a full appreciation of their power requires a good grasp of SQL s query capabilities

Dog milo = new Dog( );

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This code declares milo to be an object of type Dog and also creates a new instance of Dog. You ll see what the parentheses are for in Constructors later in this chapter. In C#, everything happens within a class. No methods can run outside a class, not even Main( ). The Main( ) method is the entry point for your program; it is called by the operating system, and it is where execution of your program begins. Typically, you ll create a small class to house Main( ), because like every method, Main( ) must live within a class. Some of the examples in this book use a class named Tester to house Main( ):

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