By Al Stevens
Examine the basics of making and utilizing item orientated databases with C++ Database improvement, second variation . This finished consultant covers the heritage and ideas of database administration, complex options for designing and writing C++ continual item database courses, and utilizing PARODY the continual, Almost-Relational item Database supervisor. C++ Database improvement, 2d version additionally encompasses a bonus diskette with resource code for PARODY and the entire examples from the booklet.
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Extra resources for C++ Database Development
9 shows how you would derive the support personnel class from the union member class as well as the employee class by using multiple inheritance. 9 Multiple inheritance Class Relationships Object-oriented designers use the properties of class design to model the relationships between objects of different classes. There are three fundamental interclass relationships: specialization,composition, and collaboration. Specialization Inheritance models relationships in which a derived class represents objects that are a kind of the base class.
8 was further decomposed into derived classes that represented the various kinds of support personnel. You could have typists, corporate pilots, chauffeurs, maintenance personnel, instructors, and so on. The system measures skill levels differently for each of these disciplines, but there is a requirement for a general-purpose skill index for the base support class. Each derived class exhibits different behavior for data entry and retrieval of the skill index, but some parts of the system invoke the skill method without knowing which kind of support personnel object is involved.
You define a structure, put some data into it, and write the structure to a disk file. A generic file input/output function can read and write the structure 41 42 c++ Database Development by using the sizeof operator. This method adjusts to modifications that change the structure. If you need features beyond simple record input/output, you can use a database management system, but, either way, you use flat record structures. 1. 1 Persistence in ( The C solution is not perfect. If the structure contains a pointer, the generic file input/output function becomes somewhat less generic.
C++ Database Development by Al Stevens