DB4O - OO Database Implementation
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db4objects is an object-oriented database that can be used locally or in a client/server configuration. It supports basic CRUD operations through a single DLL reference. The documentation provides information on installation, basic usage through sample code, and a demo of one-to-one relationships and queries using inheritance. Issues discussed include data dependence on classes and lack of database-level constraints or portability.
DB4O - OO Database Implementation
- 1. db4objects Object-Oriented Database March 2010 Jaider Ariza Luc Van Cam Bala Singam
- 2. db4objects Content Installation Basic usage Sample code Demo Issues
- 3. db4objects Installation Software available from web site: http://db4o. com/ Latest production version: 7.12 Three releases: For Java, .NET 2.0, and .NET 3.5 Object Manager is a plug-in for Visual Studio to manage databases.
- 4. db4objects Basic Usage Two modes of operation: Local and Client/Server Demo is in .NET To program with db4o, add reference to 1 DLL: Db4objects.Db4o.dll
- 5. db4objects Sample Code Open a database IObjectContainer db = Db4oEmbedded.OpenFile (DatabaseFileName) Store an object db.Store(newStudent) Retrieve objects by QBE db.QueryByExample(sampleStudent) Update an object db.Store(existingStudent) Delete an object db.Delete(aStudent)
- 6. db4objects Demo One-to-one QBE and Queries Inheritance
- 8. db4objects Source Code Model
- 9. db4objects Source Code II BD Layer
- 10. db4objects Issues Data depends on classes Constraints are not saved at database level Portability
- 11. db4objects Questions ?