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This package contains a simple OODBMS
(Object-Oriented DataBase Management System).
The list of files:
------------------
README.DOC This file
INTFACE.DOC Database interface description
DBDEMO.EXE Executable demo
OODB.PAS Source code of the database management system
DBDEMO.PAS Source code of a simple demo program
LAYOUT.PAS Auxilliary routines for the demo
OODB.TPU Compiled OODB unit
LAYOUT.TPU Compiled LAYOUT.PAS
FEATURES
---------
OODBMS is intended to be incorporated into TurboVision applications.
It maintains a storage of arbitrary objects. The only requirements
imposed on objects are that they must be TObject heirs and
their Store and Load methods must be registered (by means of
standard RegisterType procedure).
OODBMS supports transactions. One can "commit" or "abort" database at any
moment. Abort returns database to its state just before the last Commit.
All objects deleted since then are recalled and all objects put to the
database vanish. Any failure that could have occured during the transaction
(i.e., group of database operations starting with Commit and ending with
Abort or Commit) is annulled and database is rollbacked to its consistent
state. When user believes that transaction has been successfully completed
he should make all changes permanent by executing Commit.
OODBMS performs (at least, tries to perform) intelligent garbage collection.
It contains IdlePack method that should be invoked each time after
TApplication.Idle routine is called by the user's application.
IdlePack fights fragmentation and gets rid of "holes" in the database.
Packing is performed "step by step" and can be interrupted at any moment.
Generally, database is being packed while user isn't working with
application and the process of defragmentation can hardly be noticed
"from the outside".
ABOUT
------
OODBMS was developed in March - April '92 at the M.V.Keldysh Institute for
Applied Mathematics, Moscow, Russia, and at Moscow State University as
my student junior year thesis. It is distributed as a freeware. Though it
has been debugged and tested, I can't guarantee that the code is bug-free.
Everybody is not only allowed but also encouraged to correct bugs,
make modifications, distribute this program, etc. There are no limitations
whatsoever on the use of this program. In case of commercial use no
financial reimbursement is expected either by me or by the Institute for
Applied Mathematics.
There are also other versions of OODBMS with memory caching and
Paradox-based indices respectively. Information about them is
available upon request (see address below).
I would appreciate if the bugs were reported to me by e-mail (see address
below). I would also be very glad if I were contacted by somebody who
dealt with these problems and has any proposal for the upgrade of
database or just wants to "talk about".
Until September '92 I can be accessed at
shmat@drew.cog.brown.edu or
shmat@browncog.bitnet or
Vitaly Shmatikov
P.O.Box 1978
Dept. of Cognitive and Linguistic Sciences
Brown University
Providence, RI 02912
Since October '92 I'll be at the University of Washington, Seattle, WA.
Vitaly Shmatikov
July 14, 1992