🚀 go-pugleaf

On Sat, 23 Aug 2003 22:45:20 +0330, Amir Pashazadeh wrote:
>Hi
>has anyone worked with JDO?
>which implementation is the best for managed environments (used in an J2EE
>application server)?
>

I currently (am starting to) use JDO, with tjdo. It is quite easy to use 
and install although you have to download a lot of packages for it.
It has its limits, but it free and open source. Since JDO is a standard it 
should be relatively easy to switch to another jdo implementation. 
tjdo is at: http://tjdo.sourceforge.net


-- 
Gerbrand van Dieijen

WWW: http://twisted.warande.net
ICQ: 19345450

Hi,
which optional features of JDO does it support?
there are 22 optional features in JDO 1.0 specification, I think most
important difference between implementations (and to determine which one is
better that the other one) is for support of standard optional features,

optional features are:

1- Transient Transactional
2- Non-transactional Read
3- Non-transactional Write
4- Retain Values
5- Restore Values
6- Optimistic
7- Application Identity
8- Datastore Identity
9- Non-durable Identity
10- ArrayList
11- HashMap
12- HashTable
13- LinkedList
14- TreeList
15- TreeSet
16- Vector
17- Map
18- List
19- Array
20- Null Collection
21- Change Application Identity
22- JDOQL

"Gerbrand van Dieijen" <gerbrand@twistedPUNTwarande.net> wrote in message
news:slrnbkk71s.1sv.gerbrand@bellatrix.students.cs.uu.nl...
> On Sat, 23 Aug 2003 22:45:20 +0330, Amir Pashazadeh wrote:
> >Hi
> >has anyone worked with JDO?
> >which implementation is the best for managed environments (used in an
J2EE
> >application server)?
> >
>
> I currently (am starting to) use JDO, with tjdo. It is quite easy to use
> and install although you have to download a lot of packages for it.
> It has its limits, but it free and open source. Since JDO is a standard it
> should be relatively easy to switch to another jdo implementation.
> tjdo is at: http://tjdo.sourceforge.net
>
>
> --
> Gerbrand van Dieijen
>
> WWW: http://twisted.warande.net
> ICQ: 19345450
>
>
>

In <bifg7r$8m0mj$1@ID-170682.news.uni-berlin.de> Amir Pashazadeh wrote:
> Hi,
> which optional features of JDO does it support?
> there are 22 optional features in JDO 1.0 specification, I think most
> important difference between implementations (and to determine which 
> one is better that the other one) is for support of standard optional 
> features,

Here is the list of the support of optional features from the TJDO page. 
So, Application Server support is not implemented. When you are looking 
for a free JDO implementation with application server support, you 
should wait a little bit. The new coming version of the J2EE Server 
JBoss includes his own JDO implementation. There is an article on 
jdocentral.com about it.

Application object identity  	No Second Class PersistenceCapable objects 	
No Query extensions: additional String methods 	Yes Alternate query 
language 	Yes Nontransactional reads 	Yes Nontransactional writes 	No
Retaining values after transaction commit 	Yes Optimistic transactions 	
No XA/Open distributed transactions 	No Transactional non-persistent 
fields 	No Transactional transient Objects 	No Application Server 
Integration 	No

Greets, Alexander