First some Standards - Products see below ...
(Java)
JDO - is a standard
for Java Object persistence that's currently out in version 1.x - Version 2.0
is out recently. JDO is in some way a successor of the ODMG standard for
object databases - the way JDO looks to the Java developer is very similar.
(Java,
J2EE) The most widely spread persistence standard might be the J2EE CMP
(Container Managed Persistence) specification. It only applies if you use
Entity Beans. Rumor goes that the EJB 3.0 spec will look a lot more like
Hibernate or JDO 2.0 than the current version - so this could be worth a
look and maybe also a wait.
(Java,
C++, Smalltalk)
The ODMG
standard for Object Databases is a bit outdated. The last version is from
2001 and some of the heads behind it moved on to JDO - see above.
Products: Open Source and Free O/R Mappers
Licensed Products - see
below, some also offer evaluation versions
The following is a list of free mappers or open source mappers:
I used to recommend the CETUS
pages, for more products - but some of the links are outdated today
(11/2001) - so please hang on - I've traced a few of them ... Better have also a look at Java
Skyline on O/R mapping tools The following is a list of o/r mappers. We did not
examine any of them but just try to keep the list somewhat up to date. The
sequence of products does not imply ANY judgement concerning quality of the
product.
(Java) Hibernate is a very
popular free O/R mapper for Java. From the self description: "Hibernate
is a powerful, ultra-high performance object/relational persistence and query
service for Java. Hibernate lets you develop persistent objects
following common Java idiom - including association, inheritance, polymorphism,
composition and the Java collections framework.".
(Java) ObJectRelationalBridge
(OJB) is another OpenSource project for O/R mapping. It is now a part of the Jakarta
project. OJB is an
Object/Relational mapping tool that allows transparent persistence for
Java Objects against relational databases. OJB provides an ODMG 3.0 API
and also a JDO API (see standards above). OJB
is published under the GNU LGPL License.
(Java)
DBGen
is an OpenSorce project. It is an object relational mapping tool for Java. The goal is to encourage rapid prototyping for database applications.
No traffic since 2000 (at least as one can see) and no such things as JDO and
ODMG mentioned.(Java)
ozone
is a complete open source Java OODB - and you might find many of the patterns
in there
(Java) Open Quasar is an open
source persistence framework by sd&m.
Very extensive documentation compoared to other stuff - downside is that the
documentation comes in German.
(Python)
PyDO
- Python Data Objects another one for the Python prog language.(Perl)
Tangram
is an open source o/r mapper for Perl(Smalltalk)
Joe
Yoder has an o/r
mapping page, which also contains a Smalltalk example of mapping code(C++)
There
are C++ examples
by Brian Lee Price(Smalltalk)
The GLORP
project by UIUC - Camp Smalltalk: Interesting, because Alan Knight is
involved - the chief architect for TopLink (work in progress)(Visual
Basic) the JCFramework
and the AtomsFramework offer persistence for VisualBasic 6.0 and VB .NET
respectively
Products: Other O/R Mappers
(Java,
JDO) Kodo JDO
is a JDO implementation by Solarmetric(Java)
POET, now called FastObjects
is an OODB with a O/R mapping capability, that allows you to use an RDBMS as a
storage manager for a OODBMS. They also have a JDO interface.(Java)
TopLink
has now wandered to Oracle. It'sstill one of the most respected O/R mapping frameworks around.
The smalltalk version is no longer in development - but there is a strong Java
version for application servers.(Java)
CocoBase
from Thought Inc. used to have also a free version
of their o/r mapping tool. But there seems to be only support for the
commercial product now. (Java)
JDX
3.0 is a mapper by SoftwareTree
(Java)
JdbcStore
by LPC. Code example
shows that this does not look much like the ODMG standard.(Java,
J2EE)
FrontierSuite by ObjectFrontier.com:
FrontierSuite's C
(Java)
VBSF Object-Relational Framework
by ObjectMatter.
(Java)
JRELAY
by ObjectIndustries
(Java)
ObjectDB by (guess who :-) ObjectDB
(Java)
silbergrau blue is an application container that also contains an O/R mapper.
For more info see their site (products)
- the material is german only so far-
(Java)
JavaBlend (SUNs
O/R mapper for Java) is now part of SUNs Forté
development suite for Java. (the link is now dead - I'm trying to find out
what happened to Java Blend - if somebody has a pointer for me, send it to
wk<at I dont like spam :-)>objectarchitects.de.)
(Visual
Basic, Java) Informix
Object Translator now owned by IBM.
(Visual
Basic) Pragmatier
Data Tier Builder, a persistence code generator for VB6. They also offer a
free personal edition of their software for avaluation.
(C++)
The POLAR O/R mapping framework is now owned by Avantis
, a subsidiary of plenum. As you can see, avantis is off the web - no idea
where the code is now.
(C++)
SourcePro
DB by RogueWave (used to be called DBTools.h++). From the documentation it
still seems to be an object encapsulation of SQL more than a full fledged
access layer.
(C++)
Object Driver at www.infobjects.net
.
(Smalltalk)
VisualAge
Smalltalk contains it's own powerful O/R DB mapper
(Smalltalk)
GemConnect is the O/R mapping part of the well known Gemstone/S
application server.
Places and Products for .NET
The .NET community have their special places to discuss persistence issues.
You might want to check
some relevant groups and places
(place
.NET)
news://microsoft.public.objectspaces
(place
.NET)
http://groups.msn.com/DotNetPersistence
(place
.NET) http://dotnetguru.org/ -
see the section on persistence
(.NET)
GENOME O/R mapper
(.NET)
Pragmatier for VB.NET and C#
(.NET)
FastObjects for C#
(.NET)
db4o
more on products at ...
(Java)
Have a look at Java
Skyline on O/R mapping tools
(all
o-o languages)
CETUS: See this page for
products, O/R mappers and
also Object Databases.
At the time being (11/2003) it might be somewhat outdated.