db4o Developer Community

Hello. I have some problem with db file.I'm using db4o in my application written in Java.User which uses it broke db file. I know that he updated application (replaced .jar file).New version of app has the same version db4o and the same settings.What was the immediate cause of this problem I don't know. But I have assumption, that he replaced .jar ...

Hi I am a contributor to the google-guice community and open source java in general. We maintain integration modules between guice and several ORM frameworks. It seemed logical to have a db4objects alternative, and one of our contributors was kind enough to provide one. db4o is one of my long-time favorites, and we've had good success combining ...

Hi, Is there any way to create a blob file containing data that I have in memory rather than from an external file? My application splits images up into (potentially) hundreds of items, which need to be stored. I would prefer the database to handle this, so I'd like to use blobs rather than image files directly. It would be a nuisance if this ...

Edwin, Thanks for your reply and suggestions. I will look more closely in the reference documents... I also tried to incorporate your Configuration suggestions. My server code now reads:             Configuration config = Db4o.newConfiguration();           ...

Okay, I finally figured out what the problem was with my NQ in Client/Server.  It basically came down to the anonymous inner class and how DB4O sends the query over the network to the server.  It wasn't able to serialize it correctly, so the query didn't work.  I moved my Predicates out of the dao class and into their own.  ...

Hi! I have used db4o for about two years. My test program gathers data. Two years ago i have made a calculation, that blockSize=8 is ok. Few months ago the test program crashed with message ''Negative seek offset'' while opening a database file. I have no access to my data! :( Now I have db4o-6.2. I want to recover the data. I wrote the ...