By Al Stevens
Examine the basics of making and utilizing item orientated databases with C++ Database improvement, 2d version . This complete consultant covers the heritage and ideas of database administration, complicated suggestions for designing and writing C++ chronic item database courses, and utilizing PARODY the chronic, Almost-Relational item Database supervisor. C++ Database improvement, 2d version additionally contains a bonus diskette with resource code for PARODY and the entire examples from the publication.
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Additional resources for C++ Database Development
Its breadth has consequences that influence how you store and retrieve objects. C++ introduces a new set of problems related to what you can put in a class. The features of C++ suggest a solution to the problems they pose. Inheritance is a likely mechanism for adding a persistent property to an object. Consider a Persistent base class that manages object input and output for derived classes. 2. 2 has several data members: + + + + + an embedded instance of another class, known to the application.
The derived class adds behavior that is unique to its own purpose. A program can instantiate objects of a base class as well as those of a derived class. If the base class is an abstract base class-one that exists only to be derived from-the program may not instantiate objects of the base class. Inheritance is the foundation of most object-oriented designs, and it is often over-applied. Some programmers get carried away with the power of inheritance, and C++ can offer some surprises to the unwary designer.
For example, a personnel system maintains information about employees. Employees have common characteristics-name, address, date of birth, and so on-yet the system might record different kinds of employees. Managers, project workers, and support personnel might be recorded differently. Therefore, you could design a base class of employees that stores name, address, social security number, and date of birth and then derive separate classes for managers, project workers, and support personnel. Each of the derived classes would inherit the characteristics of the employee class and would have additional characteristics specific to themselves.