db4o Developer Community

Hi,Thank you very much for reporting the issue.Current implementation (in SVN) improved this time to something around 6 seconds (running on an emulator; running in an actual device should be faster)Note that the first time a Linq query is executed various assemblies must be loaded from the disk (flash memory); also, device cpus are slower than a ...

Hi, I have  a problem with isalive() method. When i killed the server, Isalive never return, and this exeptions throwing continually in the background when debugging in VS. i use db4o 7.2, and c# server:public static void Main(string[] args)  {  Console.WriteLine(''star'');  IExtObjectServer server = ...

PROBLEM:  I get errorUnexpected token: 'Token(Kind: Number, Value: '20080523')' ps: in VS 2008 i created c# project '20080523 db4o test' and tried to do Tutorial Chapter1 test.CONCLUSION (and work around):Don't Created Projects that begin with Numbers.-- Details ----------------------I created C# Solution in Visual Studio 2008 with name ...

I was going thru some of this stuff, but I'd found no answer for auto-increment on db4o-tutorial, so here's what I came up with, I'd really enjoy if you guys would give your points of view about it... Simple OO stuff, let's make a SuperEntity abstract class..I'm using C# for it.  using Db4o; public abstract class SuperEntity { } ...

Can anyone provide me with a woking sample of a DB4o windows service. I have tried it and I can Set objects but not Get objects.

Hi there! Beeing new to OOP and OODB, i have a question regarding to designing an oo database: Assume you have a class ''car''. A user should be able to create/derive some kind of ''prototype instances'' or ''prototype classes'', like mazda-xyz, bmw-m9 and so on with a gui. But at the same time there shold be instances to be generated ...

I am newbie in db4o, programming C# and db4o version 7.1 with transparent persistency by code instrumentation (db4otool –tp –nq). Could you help me to better understand object identity issues?I have a server-client scenario. The client creates an object, stores it in the server and closes the OC. Then in two parallel threads I open two separate ...

Hi, yesterday I played around with the IStoredField interface. The background is that we want to implement an automatic update of our business objects. Lets say the Zip code field of an address changes from Int32 to String.Then we want to read the old field content and convert it to the new field type to ratain the content if possible,To test ...

We would like to use an Object Database, as part of a high frequency data .NET application, to store 50GB of data per day, 5 days a week. (We would be storing 512 bytes objects at rates of up to ~3MB of data per second, we expect to store 10 Terabytes a year)  We are worried regarding db4o maximum dbsize limit, 254GB, which would ...

I am new to db4o but have a specific project that I am planning to use it for.  The project is made up of two separate applications the first is a web service (which will do all modifications to the objects) and the second is a web site which will read the objects and display web pages based on the data.  Both applications will need ...