text: DB4O
  From Mono
  Info
  - Open source object database for .NET and Mono
  - Distributed by db4objects () under the GPL or commercial license based on your needs
  - Also available for .NET CompactFramework and Java, with the same feature set and database file format, enabling cross-platform development
  - The db4o engine comes as a single 600kB dll with no dependancies outside of core Mono
  - Community Forums (),
  - db4o Mono Project Space (),
  - db4o Mono Product News blog feed () and
  - More Developer Resources ().
  The Basic Principle of) which uses prototype objects for querying... more ()
  Downloads
  db4o Mono downloads - Download under GPL:
  - db4o-6.2-mono.noarch.rpm () (noarch RPM, binary dll, no sources)
  - db4o-6.2-mono.src.rpm () (source RPM, no pre-compiled binary dll)
  - db4o-6.2-mono.tar.gz () (tar with pre-compiled binary dll and sources)
  - db4o-6.4-net2.msi () (windows installer with binary dll and sources for .NET 2.0)
  - db4o-6.4-net1.msi () (windows installer with binary dll and sources for .NET 1.0/1.1)
  If you need Unix binaries for versions later than v6.2 check the Mono Project Space ()
  More versions and add ons in the db4o Download Center ()
  Current Status
  Current versions:
  - Production v6.4
  - Development v7.0
  Release Notes for 6.4 and 7.0 ()
  Action plan
  Major milestones for 2007
  - "Canada", featuring transparent activation and fast collections
  - "Denmark", featuring unique field constraints and J2ME/CLDC support
  - "Egypt", featuring indexed collections and the split of local and C/S core
  - "7.x", featuring Trasparent Activation ()
  See actual work in progress in Jira ()
  Testing db4o
  Prerequisites
  - Have a working mono and mcs
  - Download and install the db4o noarch RPM
  - The db4o engine is a single .dll file (Db4objects.Db4o.dll) that will be located in /usr/lib/db4o/ after installation (or in the corresponding path on a different Linux distribution). Simply place the Db4objects.Db4o.dll into the directory to where you build your application.
  C# Example
  using System; using Db4objects.Db4o; public class Test { static string _file = "store.db4o"; // A very basic db4o example that demonstrates // automatic schema generation and Query-By-Example public static void Main (string [] args) { using (IObjectContainer db = Db4oFactory.OpenFile (_file)) { db.Set (new Pilot ("Michael Schumacher", 101)); db.Set (new Pilot ("Rubens Barrichello", 99)); db.Commit (); IObjectSet pilots = db.Get (new Pilot(null, 101)); foreach (Pilot p in pilots) { Console.WriteLine (p); } } } } public class Pilot { string _name; int _points; public Pilot (string name, int points) { _name = name; _points = points; } public override string ToString () { return _name + "/" + _points; } }
  Building the C# example
  - Save the example to a file, such as, Test.cs
  - Copy the Db4objects.Db4o.dll from /usr/lib/db4o/ to the same folder
  - Compile
  $ mcs Test.cs -r:Db4objects.Db4o.dll
  - Running the example:
  $ mono Test.exe
  - Many more examples can be found in the tutorial that comes with the db4o download.
  On UNIX
  - We recommend to download and install the noarch RPM that comes with a precompiled Db4objects.Db4o.dll.
  - After the installation Db4objects.Db4o.dll, Db4objects.Db4o.Tools.dll and Db4objects.Db4o.Tests.exe will be found in /usr/lib/db4o/ (or the corresponding path on other Linux distributions).
  - The db4o documentation will be found in /usr/share/doc/packages/db4o/ (or the corresponding path on other Linux distributions). A tutorial and API documentation is provided.
  - Check your Mono installation on your system by running the db4o regression tests.
  cd /usr/lib/db4o/ mono Db4objects.Db4o.Tests.exe
  - As the final result you should get:
  "AllTests completed." "No errors detected."
  On Windows
  - We recommend to download the .NET version with the Windows installer. It will work just as good for Mono and it will additionally come with a tutorial that can be run against a live database.
  - Run the msi installation.
  On all platforms
  - Work through the tutorial. It will provide very detailed help to get you started with db4o.
  - Create db4o database applications by programming against the db4o API.
  - Deploy the single Db4objects.Db4o.dll along with your applications.