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FastObject.NET - native object database for .NET
Versant Software has released the FastObject.NET class persistence framework capable of storing your objects into a native, object-oriented database. Using metadata tags you can add persistent attributes to make objects persistent capable.
The product includes support for inheritance (you can choose any subset of hierarchy), collection mapping, and private members mapping using properties.
FastObject.NET uses operating system files to store its data the same way desktop databases do, like MS Access and FoxPro. However, usage of the .NET version will be limited until server-side database connectivity is available. Versant currently does have such a product, called t7, but .NET is currently not supported.
Versant's product line seems to be confusing - they offer both O/R and native object persistence for Java (Kodo and FastObjects), a server-side solution for Java and C++ (t7), and a desktop framework for .NET. Comments and thoughts are welcome.
Product tutorial
http://www.versant.net/eu_en/solutions/dotNet_en
http://community.fastobjects.com/community_fastobjects_net.htm
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Message #119851
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FastObject.NET - native object database for .NET
I found the read on Versant's page really fascinating. I haven't seen a model quite like this for use in the persistence of objects, but I've seen products that attempt to store objects in the same way.
A number of intriguing questions arise on something like this (obviously, they all can't be answered now, but the proliferation of object mapping technologies are causing these questions to rise in importance):
1) I didn't see a trade off analysis on Versant's site as to when a model such of this should be used instead of a more traditional relational model. I wonder if anyone has done some analysis as to best case scenarios for one over the other?
2) Are there J2EE products that approach the problem the same way and how they perform in the marketplace in comparison to more traditional OR technologies?
One of the things you should consider is contacting Bruce Martin at The Middleware Company. He's been working on a specification that TMC will publish that will enable TMC to perform productivity and performance analysis on object-relational products. He's been talking to various vendors and this looks like a technology that may have a fit in his research. His email is bruce@middleware-company.com.
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Message #119882
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FastObject.NET - native object database for .NET
“I didn't see a trade off analysis on Versant's site as to when a model such of this should be used instead of a more traditional relational model. I wonder if anyone has done some analysis as to best case scenarios for one over the other?”
The best analysis on the subject I’ve seen, is made by Martin Fowler in his book Patterns of Enterprise Application Architecture (ISBN 0321127420).
To sum up; the more complex your domain and business rules, the more to gain with a domain-driven approach over a relational.
Regards,
// Martin Rosén-Lidholm
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Message #120851
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Indeed.
It does ease the burden of implementation. There is a cost however, you lose the ability to interface with the data that is being persisted. This can be a huge problem especially when trying to build systems that can interface with one another.
The other major issue with persistance engines is that there is no standard object query syntax. One can retrofit SQL to do the querying, or use XPath, as in projects like Bamboo. The problem with this is that it's often difficult to debug or test your queries in the development process.
The major barrier to adoption for these types of persistance engines is the lack of an industry agreed upon method for putting data in, and getting it out.
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Message #122085
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CORRECTIONS
Hi,
sorry for my late reply, but there are a couple of wrong statements contained
in the initial posting, here the corrections:
1. FastObjects .NET targets our native OODBMS AS WELL AS relational databases, currently IBM DB2, MS SQL Server and Oracle are supported.
2. FastObjects .NET does NOT rely on properties at all! FastObjects .NET utilises a very sophisticated code enhancement technique, that makes it possible, to support private and public fields and this approach is much faster then reflection-based approaches.
3. MOST database systems can use/do use operating system files. Take a look into your Oracle installation, I would call it operating system files, where your data is contained in ;-)
4. Server-side database connectivity has ALWAYS been available! Only our Trial
Edition does not contain the server executable nor the RDBMS support.
If you want to evaluate the full product just write an email to:
info@versant.net
5. Confusion is created by such postings like the initial one ;-)
Versant offers:
-Versant VDS with interfaces for C++ and a JDO interface
(the JDO interfaces is the Kodo Versant Edition)
-FastObjects with interfaces for C++, JDO and .NET, supporting the native FastObjects backend, Oracle, IBM DB2, SQL Server
-Kodo with JDO interfaces, supporting a lot of relational databases
This means we offer the right data persistence solution for every platform (Windows, Linux, Unixes, ...), every programming language/framework (C++, Java, .NET) and every backend (OO as well as relational).
Best regards,
Christian Romberg
FastObjects Team
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Message #122347
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Indeed.
I agree. One little detail; “there is no standard object query syntax”. Yes, there is - the OCL of UML. The only product I’ve used that uses OCL for this (and other purposes) is Borland’s ECO.
Too bad all other ORM/MDA tool vendors seem to choose to make there own object query language. So, unfortunately “the major barrier to adoption for these types of persistance engines is the lack of an industry agreed upon method for putting data in, and getting it out.” is true after all...
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Message #122372
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Indeed.
FastObjects .NET offers OQL as its query language.
OQL (Object Query Language) is a standardized object oriented query language created by the ODMG, and is syntactically close to SQL.
Best regards,
Christian Romberg
FastObjects Team
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