Program Name and Version: VCRDBASE
 
Author Name: Doctor Disk Drive
Address:        Drive Industries
                4104 Garrett Place
                Colorado Springs, CO  80907
 
Telephone Number:
 
Program Classification: dbms
 
Suggested Donation: $10
 
Program Description: VCRDBASE is a data base written in Turbo Pascal for the IBM
PC. It can be used to keep record of a personal video library by the reference
of the following data elements:
 
                Movie Name              String[20]
                Movie Publisher         String[20]
                Movie Star              String[20]
                Movie Style             (Horror,Comedy,Action,Drama,Misc.)
                Movie Sub-Style         (Horror,Comedy,Action,Drama,None)
                Tape Number             Integer
                Counter Starter Number  Integer
                Counter End Number      Integer
                Tape Speed              (S,L,E)
                Hard Copy Verification  Boolean
 
VCRDBASE is quite unique in that it uses a Linked List data structure for record
management and sorting.  In this data structure, the Header file, HEADER.DAT,
contains the record number of the first alphabetical movie.  That movie (the
first alphabetical) contains a forward link and a backward link.  The forward
link contains the record number of the next alphabetical movie and the backward
link contains the record number of the preceding record (or in this case, 0
because there is no previous record) Adds are made by placing the record in the
next available file position, and then searching where it belongs among the
records, and adjusting the links to include the new record.  It will properly
alphabetize all your movies and is remarkably fast in sorting compared to many
sorting techniques.  The data file, DATAFILE.DAT, contains all the movie records
and neither of the files should be renamed, or physically edited because they
are both random access files that are accessed by key only.