Support Forums: Message List - Object Persistence with the db4o Object Database http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Sat, 18 May 2013 23:30:18 -0400 Serialization does not work for longterm persistence http://www.theserverside.com/discussions/thread.tss?thread_id=30353 I see no reason to use relational database for object persistence if serialization can be used to solve the same thing.
Serialization should not be used for longterm persistence for the following reasons:
(1) Serialization...]]> Thu, 09 Dec 2004 08:55:57 -0500 Thu, 09 Dec 2004 08:55:57 -0500 Thu, 09 Dec 2004 08:55:57 -0500 Dec 9, 2004 Carl Rosenberger 0 Relational DBMSs Considered Harmful http://www.theserverside.com/discussions/thread.tss?thread_id=30353
"The relational model is mathematically correct."

That is important but it is not enough. The Chinese Remainder Theorem is also mathematically correct...]]> Thu, 09 Dec 2004 02:46:52 -0500 Thu, 09 Dec 2004 02:46:52 -0500 Thu, 09 Dec 2004 02:46:52 -0500 Dec 9, 2004 Klaus Wuestefeld 0 Fear http://www.theserverside.com/discussions/thread.tss?thread_id=30353 I think it's sad that someone deeply involved in a successful and neat Java product like Hibernate has retarded to citing DBDebunk FUD.
If I had a product prolonging the morbid days of the relational database by putting object...]]> Thu, 09 Dec 2004 00:37:08 -0500 Thu, 09 Dec 2004 00:37:08 -0500 Thu, 09 Dec 2004 00:37:08 -0500 Dec 9, 2004 Klaus Wuestefeld 0 db4o is not old stuff in new bags http://www.theserverside.com/discussions/thread.tss?thread_id=30353
- Persistence is non-intrusive. You simply store any object without having to run an enhancer or a special classloader.
- True object querying is provided using query-by-example.
- It's native Java.
- Simple...]]> Wed, 08 Dec 2004 19:09:36 -0500 Wed, 08 Dec 2004 19:09:36 -0500 Wed, 08 Dec 2004 19:09:36 -0500 Dec 8, 2004 Carl Rosenberger 0 Three O-R mismatches, not one http://www.theserverside.com/discussions/thread.tss?thread_id=30353
Java and .NET are mainstream, right? It's only natural that people simply want to store objects, right? Now how...]]> Wed, 08 Dec 2004 19:03:22 -0500 Wed, 08 Dec 2004 19:03:22 -0500 Wed, 08 Dec 2004 19:03:22 -0500 Dec 8, 2004 Carl Rosenberger 1 Object Persistence with the db4o Object Database http://www.theserverside.com/discussions/thread.tss?thread_id=30353 Hibernate second level cache will probably do the trick for you.
Yes, we use both object and query Hibernate caches, both help a lot. But application internally require 2 additional cache levels to store task/user tree with...]]> Tue, 07 Dec 2004 12:10:42 -0500 Tue, 07 Dec 2004 12:10:42 -0500 Tue, 07 Dec 2004 12:10:42 -0500 Dec 7, 2004 Maxim Kramarenko 0 Hierarchy example http://www.theserverside.com/discussions/thread.tss?thread_id=30353 No, this shows that you should make a query to check permissions for the whole list of items. Making a separate check for each item almost the same mistake as the dreaded 1+N loading in BMP entity beans.
Yes, we has such...]]> Tue, 07 Dec 2004 11:48:58 -0500 Tue, 07 Dec 2004 11:48:58 -0500 Tue, 07 Dec 2004 11:48:58 -0500 Dec 7, 2004 Maxim Kramarenko 0 Object Persistence with the db4o Object Database http://www.theserverside.com/discussions/thread.tss?thread_id=30353 Suggest reading Joe Celko's SQL for Smarties: Advanced SQL Programming Tue, 07 Dec 2004 10:16:27 -0500 Tue, 07 Dec 2004 10:16:27 -0500 Tue, 07 Dec 2004 10:16:27 -0500 Dec 7, 2004 Konstantin Ignatyev 1 Hierarchy example http://www.theserverside.com/discussions/thread.tss?thread_id=30353 This means that we should execute START WITH/CONNECT BY query (or any other syntax) 3000-5000 times times in a second or even faster. Even query by primary key can't be so fast :-)This is very simple example, but it shows that hierarchical...]]> Tue, 07 Dec 2004 06:40:05 -0500 Tue, 07 Dec 2004 06:40:05 -0500 Tue, 07 Dec 2004 06:40:05 -0500 Dec 7, 2004 Bostjan Dolenc 1 Object Persistence with the db4o Object Database http://www.theserverside.com/discussions/thread.tss?thread_id=30353 Suggest reading Joe Celko's SQL for Smarties: Advanced SQL Programming Tue, 07 Dec 2004 03:48:09 -0500 Tue, 07 Dec 2004 03:48:09 -0500 Tue, 07 Dec 2004 03:48:09 -0500 Dec 7, 2004 Maxim Kramarenko 4 Object Persistence with the db4o Object Database http://www.theserverside.com/discussions/thread.tss?thread_id=30353
This is the kind of FUD we have heard for more than 10 years from network/object-database vendors. I know, selling ideas from the 60's can be quite hard, but saying that a data model based on logic and mathematical principles is...]]> Mon, 06 Dec 2004 16:43:48 -0500 Mon, 06 Dec 2004 16:43:48 -0500 Mon, 06 Dec 2004 16:43:48 -0500 Dec 6, 2004 Konstantin Ignatyev 5 object != value http://www.theserverside.com/discussions/thread.tss?thread_id=30353 If you hard-code it in both, then you've got double-maintinence.
Yes, this is one of reasons to generate adapters. I am not expert, but I hope you can define model in programming language neutral way for OODBMS too, it causes the...]]> Mon, 06 Dec 2004 16:28:07 -0500 Mon, 06 Dec 2004 16:28:07 -0500 Mon, 06 Dec 2004 16:28:07 -0500 Dec 6, 2004 Juozas Baliuka 0 object != value http://www.theserverside.com/discussions/thread.tss?thread_id=30353 Mon, 06 Dec 2004 15:59:47 -0500 Mon, 06 Dec 2004 15:59:47 -0500 Mon, 06 Dec 2004 15:59:47 -0500 Dec 6, 2004 Christian Bauer 0 object != value http://www.theserverside.com/discussions/thread.tss?thread_id=30353
I'm not saying not to use an RDBMS. Just acknowledge that doing so violates OO encapsulation. Its a risk, and all risks can be managed. But it is a risk you wouldn't have with a proer object database.
Where can we find...]]> Mon, 06 Dec 2004 15:34:24 -0500 Mon, 06 Dec 2004 15:34:24 -0500 Mon, 06 Dec 2004 15:34:24 -0500 Dec 6, 2004 Brian Sayatovic 1 Lightweight persistence - Prevayler http://www.theserverside.com/discussions/thread.tss?thread_id=30353 ...Particularly I would like to point out to prevayler.In many, many cases this is a fanatstic solution
* No external container
* One stays completely in the Java world
* Extremely fast and reliable
* Very easy to test and...]]> Mon, 06 Dec 2004 15:31:08 -0500 Mon, 06 Dec 2004 15:31:08 -0500 Mon, 06 Dec 2004 15:31:08 -0500 Dec 6, 2004 Brian Sayatovic 0