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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