db4o Developer Community

These are custom ASP.NET 2.0 providers which use db4o as back-end. Beginning with Membership Provider, Role Provider, and Profile Provider. Code is based on MSDN sample code and is unit-tested. Version 1.0 uses db4o 7.4 and C# 3.0. Prior versions of source use db4o version 6.1 and C# 2.0. http://www.codeplex.com/db4oProviders

Olá!Tenho uma dúvida que tenho certeza que muitos ainda vão terão (se já não tiveram) em relação a busca dinâmica. Por ex: Em um formulário com alguns campos, por exemplo, Nome, Cidade, uma combo de Departamentos, e uma de Cargos, ambas populadas por seus respectivos objetos, onde o usuário fará uma busca de que se não preencher nenhum campo e ...

Hi, Just to let you know I've posted about Transparent Activation / Persistence to db4o blogs ;) Adriano

As the popular saying  tell us, there's no such thing as free lunch. It is no different for work related subjects. When we introduced Transparent Activation (TA) concept we knew that it could make developer's life easier (by presenting a simpler model for object life cycle): developers would not be required to think about activation depths ...

Hi, In the first installment of this series I presented the idea of having a typesafe way to configure db4o. In the second one, I explored how we could use expression trees to figure out a property name being accessed. In this post I'll address the issue on how to dive into the property's IL (intermediate language) to come up with a field name ...

Hi, Today's post is in the series ''what is wrong with this code'' but before presenting the actual problematic code I want to give some background, so bear with me. At Db4o we run migration tests (regularly) in order to guarantee that we are able to load (and query) databases created by older versions of Db4o engine. The way it's accomplished ...

In my last post I proposed to derive field names from a property accessor in order to gain type safety and compiler support when configuring some aspects of D4bo. So, given the following class:public class Test { private int _age; public int Age { get { return _age; } set { _age = value; } } }we could use the following ...

Hi! I've just updated the Linq Console application! Now you don't need to copy your model assemblies to Linq Console folder anymore! You can use the load command as follow: :load ''c:\my projects\test\Test.Model.dll'' and the application will be able to load it :) The source code can be downloaded from our svn ...

As of today, Db4o uses strings to reference fields in some scenarios such: SODA queries Configuration See the sample bellow: IConfiguration cfg = Db4oFactory.NewConfiguration(); cfg.ObjectClass(typeof(Test)).ObjectField(''_age'').Indexed = true;IMHO, using strings in these situations is sub-optimal as: Such solution relies in ...

Pessoal, Como eu faço pra usar o db4o e configurar um índice em cima das auto-properties do C# 3.0?