By Dr. Wolfgang Kirsten, Michael Ihringer, Peter Schulte, Dr. Bernhard Röhrig (auth.)
Nowadays, newly constructed software program applications are frequently out of date already on the time in their creation. Object-oriented software program improvement is a possible—if now not the only—solution to this hassle: functions are modeled as software program gadgets that describe the homes and the habit of real-world entities. Such gadgets are encapsulated, in that they hide—behind a publicly identified interface—the complexity in their inner facts buildings and behaviors. this permits gadgets for use in quite a lot of application programs with no need to grasp the main points in their inner implementation.
Linking object-oriented modeled functions with a database locations precise calls for on a database administration procedure and improvement atmosphere whilst the standard functionality and semantics losses are to be refrained from. This publication presents a close description of the thing version of the Caché postrelational database. moreover, it courses the reader step by step in the course of the improvement of postrelational purposes. The accompanying CD-ROM comprises the full linked software program:InterSystems Caché™ 4.0 Single-User
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Additional info for Object-Oriented Application Development Using the Caché Postrelational Database
Some object-oriented languages-such as Java and C++-do not support an equivalent concept of properties. Instead, these languages support a combination of private variables and public methods that are used to access properties. Cache provides a rich object model with public properties according to the following principles: • Properties can be literals, references to persistent objects, embedded objects, streams (also known as binary large objects or BLOBs), collections ofliterals, or objects or relationships between persistent objects.
Code methods can contain any valid Cache ObjectScript code, including macros, embedded SQL, and embedded HTML. Expression methods An expression method contains just an expression of Cache ObjectScript code, not a complete routine. The compilation of the class replaces the method call with this expression, which is executed at runtime. All arguments in the formal list of an expression method must have a default value. An invocation using call by reference is not valid. Also, the expression cannot contain macros, embedded SQL or embedded HTML.
In contrast, Cache provides registered classes with a comprehensive set of built-in functions. For example, the method %New() creates a new instance of a class and %Closeodeletes one from memory. 28 A registered object class is transient, in that it has no code that would require storage in a database. Cache automatically creates the storage methods for embeddable and persistent classes. Whereas objects of embeddable classes can be stored only embedded in a persistent object, persistent objects have their own object identifier and so can be stored independently in the database.