I have written three new tutorials, in CVS, introducing mapping, the PB
api, and the ODMG api. As so many things refer back to the current
tutorials they are not published on the site yet.
I have them up for review purposes on my personal site, and they all
work (I think). You are welcome to ta
hi,
i downloaded ojb1.0-rc4, unziped it and discovered, there are plenty of
examples in the src/test folder. i hope i can learn ojb from the
examples(besides tutorial 1, 2 and 5) given. but, they are all scattered
around... how do i inter-related them? are there any more documentation
describing t
if 'doc' and 'item' are both persistence objects, and they are having m:n
relationship.
if i set [auto-update=true], then by persisting 'doc' will automatically
persisting 'item' too.
just make a testcase. i have a 'doc' consists of 3 'item'.
if i coded as such
broker.beginTransaction();
I am using OJB 1.0.rc4 Persistence Broker API. I am not
using anonymous keys. Under a certain scenario, an existing
1:1 association is being lost on an update.
Here is the scenario.
Assume object A and B have a 1:1 relationship. Object A has
an attribute b of type B and an attribute bId which sho
Hi Matt,
You will need to either use the "autoincrement" feature that OJB provides, or you will
need to manually set your primary key before calling store(). See the following link
for details on using "autoincrement". In addition to a number of preexisting
implementations, you can even writ
FYI.
I have 2 different extents (PaymentDecision and CommitmentDecision) that
extend the same class, Decision . Each is persisted in a different table.
When I try to retrieve Decision using QueryBySQL, I have to associate one
of the descendent tables to Decision in its class-description table
att
Hello.
I set all debug levels to FATAL but I still getting info messages. The
logger I'm using is org.apache.ojb.broker.util.logging.PoorMansLoggerImpl
My application is text-based and I, obviously, don't want this log
messages to appear to the end-user :)
Thanx,
Gonçalo.
[junit]
[org.apach
I'm having some trouble using the PersistenceBroker store method on an
object mapped with a simple inheritance hierarchy.
Here's how my classes are configured:
public class Person
{
private String oid;
private String lastName;
private String firstName;
// (setters and getters)
}
Thanks for the answer...worked the way I wanted it to for my immediate
problem in production.
Not keen on the fact that I know have a ton of extra SQL calls--but I guess
that is the price I pay right now! :)
Thanks again!
-Andrew
-Original Message-
From: Armin Waibel [mailto:[EMAIL PROT
Hello.
I think this was already discuted here but it doesn't make sense in my head.
Is it better pratice (i.e. fastest) to open a database
(Implementation.newDatabase().open()) for each transaction or to
open a database in the beggining of the whole application and close it
when the app ends
Hi Ramon,
The members of this list can probably help you, but we will need to see more details
on what you are doing. Can you send us the following?
- The code snippet in question
- Your repository_user.xml
- The version number of OJB you are using
- Any exceptions reports or logs that are relev
Hi Jakob,
Thanks for your reply! Perhaps I have some ideas on how we could do this. Here are
two:
Idea 1
--
Join all the columns from all tables in the hierarchy together, and then look to see
which join columns are not null, in order to determine the true subclass
I demonstrate this usi
Jumping in late, but its germane to what I'm working on. So, if I read what everyone
is saying correctly, the following:
does not do what I would expect? :
1. Q
I'm trying update an object than inherits from other, the
problem 's than de base class doesn't update, it's makes an insert and
an update of the extends class.
Could someone help?
-
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F
Hi,
On Fri, 17 Oct 2003 12:13:08 -0500, <[EMAIL PROTECTED]> wrote:
I keep getting this message in my logs. Also this seems to be causing a
cache of this object. The object will not reflect changes. Even though
accessing it a different show it was changed. Can someone tell me what
this is and if i
Hi Armin,
Armin Waibel [EMAIL PROTECTED] wrote:
> I propose to add the associated JdbcConnectionDescriptor
> as argument too
>
> >>>=
> >>>ConnectionValidator.java
> >>>=
> >>>package org.apache.ojb.broker.accesslayer;
> >>>
> >>>public interface Co
I keep getting this message in my logs. Also this seems to be causing a
cache of this object. The object will not reflect changes. Even though
accessing it a different show it was changed. Can someone tell me what
this is and if it's good or bad? It looks bad to me.
[org.apache.ojb.broker.acces
hi justis, wallace,
this problem is caused by Identity#equals noch checking objectsRealClass
. consider the following situation: a select for InterfaceA fires 2 selects
SELECT A0.VALUE_,A0.ID FROM A_TABLE A0
retrieving Table_A objects with ids 1 and 2
SELECT A0.VALUE_,A0.ID FROM B_TABLE A0 INNER
Hi again,
this sounds great!
I propose to add the associated JdbcConnectionDescriptor
as argument too
>=
>ConnectionValidator.java
>=
>package org.apache.ojb.broker.accesslayer;
>
>public interface ConnectionValidator
>{
>public boolean isValid(
Hi Armin,
Armin Waibel [EMAIL PROTECTED] wrote:
> On Fri, 17 Oct 2003 11:54:56 -0400, Justis Peters <[EMAIL PROTECTED]>
> wrote:
> >Could we handle this by defining an interface and allowing users to
> >specify their own tester class? Here is what I am picturing:
> >
> yes this will be possible
Is there a way how I can simultaneously use multiple databases from
OJB?
Yes, configure each database in the repository_db.xml and retrieve
connections by the jcdAlias specified in the descriptor.
Configuration:
http://db.apache.org/ojb/repository.html#jdbc-connection-descriptor
Usage via the PB
Earlier this used to support the tables can be in different different
database using repository.xml. Nowadays you can have only PBs accessing
different database.
They claim that this earlier design makes the impl. complex - for e.g. 2 ph.
commit is not needed anymore.
But if you use the multiple PB
Hi
I have a 1:n relationship.
If I do a query for the parent object, based on some attributes of the
child-object, the query returns a parent object, for each matching child
object.
This way, the same parent objects is returned multiple times.
Shouldn't this be filtered out?
Best regards
-- Pat
Hi,
same problem for me ...
Anybody have a solution ?
I can't replace application on the same context root with tomcat manager because
remove application can't remove all lib. (struts.jar ?).
I think force garbage collector can't solve this problem because connection seems to
be in use ...
This a
Hi,
if I understand, you have an application working fine without OJB and you want to use
OJB to import data from different database structure.
I think it's a good idea :
simply extend your class and define one class per import "way".
base class : A.class
define AfromDS1.class extends A
define Afr
Folks,
Is there a way how I can simultaneously use multiple databases from OJB?
Thank you
-Sergey
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i found a solution for it.
i need to close the connection on my own, but not by calling "con.close()" -
I need to call "broker.serviceConnectionManager().releaseConnection()" from
where i got the connection and than everything works fine.
thanks for your help
ben
- Original Message -
Fr
Hi again,
This does not help me at all. Now I do get the warnings on every statment i
execute.
do you see any other ways to get around this??
best regards,
Ben
- Original Message -
From: "Armin Waibel" <[EMAIL PROTECTED]>
To: "OJB Users List" <[EMAIL PROTECTED]>
Sent: Tuesday, October 1
Hi again,
On Fri, 17 Oct 2003 11:54:56 -0400, Justis Peters <[EMAIL PROTECTED]>
wrote:
Hi Armin,
Could we handle this by defining an interface and allowing users to
specify their own tester class? Here is what I am picturing:
yes this will be possible, but can you describe
what's the advanta
hi justis,
well, but the sample code does NOT show any extents ;)
i just installed your testcase and will start digging into it.
jakob
Justis Peters wrote:
Hi Jakob,
Thanks for your reply! Yes. What you describe is exactly what I am doing.
I have read your discussion with Brendan, and I unde
Hi Armin,
Could we handle this by defining an interface and allowing users to specify their own
tester class? Here is what I am picturing:
=
ConnectionValidator.java
=
package org.apache.ojb.broker.accesslayer;
public interface ConnectionValidato
Hi Jakob,
Thanks for your reply! Yes. What you describe is exactly what I am doing.
I have read your discussion with Brendan, and I understand what you are saying. This
is in direct conflict with what is implied in
"http://db.apache.org/ojb/tutorial3.html";, though. The section titled "mapp
Hi Andrew,
you can use the 'validationQuery' attribute of connection-pool
element to specify a validation query. This query will be executed
each time before a connection was delivered by the pool.
Any proposals to make this more sophisticated are
welcome.
regards,
Armin
On Fri, 17 Oct 2003 11:20:
That is kind of what I assumed. It makes using proxies somewhat worthless in
an EJB environment, at least in my opinion. Proxies to me seemed to be a
great way to do lazy instantiation, and keep the client ignorant of
persistence mechanisms.
So, if you have to materialize the entire graph before se
I apologized in advance for the increase in mail traffic today. I have
checked the archives for an answer to this, to no avail.
I am seeing, as expected, if our Database has been restarted that any db
connections in the pool as becoming invalid. I understand how this is
happening -- the connection
Hi Charles,
Thanks for your idea and code snippets. I'll try if this helps in my
cases. I have a feeling it won't, though. In the A->B example reorder()
doesn't change the initial order, so calling it twice won't either. But
now I have a whole weekend ahead to spoil with thinking about this pro
That is kind of what I assumed. It makes using proxies somewhat worthless in
an EJB environment, at least in my opinion. Proxies to me seemed to be a
great way to do lazy instantiation, and keep the client ignorant of
persistence mechanisms.
So, if you have to materialize the entire graph before s
Hi Andrew,
All that leads me to another question that I don't seem to find an answer
to: if a remote EJB passes off an OJB dataobject, I would assume you cannot
use any proxies because it would not be able to walk back across the wire,
correct? I am currently not making use of any proxies because
hi andrew,
the method retrieveReference should check for null:
...
else
{
refObj = getReferencedObject(obj, rds, cld);
if ((refObj != null) &&
(!Proxy.isProxyClass(refObj.getClass())) && (!(refObj instanceof
VirtualProxy)))
Thanks you very much for your answer ... so it's not possible without sql
...
De Jakob Braeuchi :
> salut stephane,
>
> you could use a query by sql, there you can do what you like.
>
> jakob
>
> [EMAIL PROTECTED] wrote:
>
> > Is my question fool ?
> >
> > How create a query between two table
Hi Manjula,
OJB requires to have at least one attribute per class defined as primary
key.
But it is sufficient to delare is as primary key in the
field-descriptor. It is not required to be defined a primary key in the
database.
So for a view you just have to define those attributes as primary
Thanks for the offer...I can definitely peer around in the code to get a
feel for it.
However let me ask you this...how would I best use OTM in this situation?
Would OTM solve my problem?
Let me rephrase, assuming I could use OTM, would the EJB service continue to
pass out clones to client applic
There is no documentation outside of the javadocs for it yet. I can
happily provide pointers and samples for you, if you like, from my
"learn the OTM" project. I am working on learning my way around it well
enough to write decent docs on it -- just a matter of finding the time.
I wouldn't call
1. Should collections for 1:n relationships be updated automatically?
Example: I have a class "foo" which has a collection of "bars". The bar class has a
corresponding reference to its parent "foo." If I create a new bar, do a
bar.setFoo(fooInstance) and save that bar, should I expect fooIn
Fantastic! clearing the cache and use of a custom query has solved the
problem, and was a pretty simple solution!
It's a pitty i hadnt noticed that bit at the bottom of tutorial4.
Thanks a lot for the help,
Daniel.
- Original Message -
From: "Jakob Braeuchi" <[EMAIL PROTECTED]>
To: "OJB
Hi Andy,
it's done. Your patch + updated test cases
now in CVS.
Thanks for contribution.
regards,
Armin
On Thu, 16 Oct 2003 11:50:31 -0400, Andy Malakov <[EMAIL PROTECTED]>
wrote:
Hello All,
It looks OJB 1.0RC4 does not support collections in nested object, when
nested object belongs to parent
Thanks for the response...you added some interesting point.
I knew somewhat that the OJB cache only worked with QueryByIdentity(), but
the gains are still significant for us. Our object model has some rather
deep and wide trees (for better or worse), and the gain on object
materialization on the h
Is the OTM, layer stable enough to use in production, or should I just stick with ODMG
for now?
If yes, were is the most stable source: HEAD or rc4 from the apache download site?
Thanks,
||
| Scott T Weaver |
| <[E
hi andrew,
please try this.
jakob
Jakob Braeuchi wrote:
hi andrew,
yes, this is a problem. class-descriptor refresh overrides
reference-descriptor refresh. imo we should refresh the referenced
instance in PersistenceBrokerImpl#retrieveReference. but this requires
some enhancements in getDB
Depending on your deployment timeline you might want to look into the
OTM for this type of deployment. It provides the high-level
functionality you are looking for from ODMG, but it also knows how to
play very nicely with JTA transactions -- a big plus in EJB containers.
The OTM is the least ma
hi daniel,
Daniel Perry wrote:
I didnt try that - didnt know about that option.
However, i sort of fixed the problem by executing the following code after
any update/insertions which may screw up ordering. I think perhaps this is
better that the refresh=true option, as the cache is only cleared
I didnt try that - didnt know about that option.
However, i sort of fixed the problem by executing the following code after
any update/insertions which may screw up ordering. I think perhaps this is
better that the refresh=true option, as the cache is only cleared when data
is changed, so the cach
I currently have our application running using OJB. I am using the PB
interface because it was the easiest to prototype and get up and running.
We have a Struts application that calls a collection of EJB services for
retrieving specific object-trees that the web app needs, along with
Add/Update/De
hi andrew,
yes, this is a problem. class-descriptor refresh overrides
reference-descriptor refresh. imo we should refresh the referenced
instance in PersistenceBrokerImpl#retrieveReference. but this requires
some enhancements in getDBObject to avoid loops.
jakob
Clute, Andrew wrote:
I shoul
hi wallace,
currently there are problems when mixing extents and super-reference.
imo it has something to do with Identity and caching.
the examples on the website do NOT mix those features. i always regarded
multi-table join as a technical feature to support mapping ONE class
onto MANY tables.
Hi,
I have been using OJB for a while quite successfully. Today I run into
an outofmemory exception which I could trace to the ojb cache.
I am doing a copy from one DB to another involving 10+ objects. Each
object is stored in the cache using a key derived from its identity
(int). These st
Hi Jakob,
Sorry to be chiming in from left field, but does this imply that 'super'
references and extents cannot be used together in the same object model?
In the same class descriptor?
Please explain.
Wally
-Original Message-
From: Jakob Braeuchi [mailto:[EMAIL PROTECTED]
Sent: Friday
Yes, that's what I meant. If you don't do it, you try to persist objects
that are in an inconsistent state, which could easily explain the DELETEs.
Now why this causes an infinite recursion, I have no idea. Sorry.
Gerhard
PS: You are not locking the Role objects, so I assume you left the
"us
Hi,
I, too, have had problems with this algorithm - and, it is not just deletes
that have a problem - my FK violations actually happen on an insert update.
My particular scenario was solved by calling re-order twice.
I then patched my local copy to call re-order until no changes were
performed.
Hi Armin,
I certainly look forward to the upcoming cache improvements. The
cache-by-class feature is very useful and I already use it to distinguish
between basically static and more dynamic data.
Regards,
Gerhard
Armin Waibel <[EMAIL PROTECTED]>
16.10.2003 16:28
Bitte antworten an "OJB Us
Hi,
Since I am having problems with referential integrity violations when
deleting objects I tried to understand the reorder() method in
org.apache.ojb.odmg.ObjectEnvelopeTable.
>From what I understand, the way this reordering is implemented leads to a
strong bias of the final order towards t
salut stephane,
you could use a query by sql, there you can do what you like.
jakob
[EMAIL PROTECTED] wrote:
Is my question fool ?
How create a query between two table with no relationship, no path ?
Thanks for all your help
--
hi daniel,
have you tried refresh=true in collection-descriptor ? this forces a
reload of the grades even if job is in the cache.
jakob
Daniel Perry wrote:
ok, still cant figure this out. If i add the gradename column to the query
string like so:
String queryStr ="select job from " + Job.clas
Is my question fool ?
How create a query between two table with no relationship, no path ?
Thanks for all your help
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ok, still cant figure this out. If i add the gradename column to the query
string like so:
String queryStr ="select job from " + Job.class.getName() + " where
deleted=0 order by jobname,gradename";
it thows an exception (understandibly) - it's trying to sort by gradename in
the wrong query:
SE
hi justis,
please send me your testcase.
jakob
Justis Peters wrote:
Hi All!
Just a couple weeks ago I started using OJB, and I am extremely impressed. My gratitude goes to all who put in the work to make it possible.
Upon converting some of the more complicated parts of my object model, I en
hi justis,
is this another case of mixing extents and 'super'-references ?
i had a long offline discussion with brendan regarding this topic:
http://article.gmane.org/gmane.comp.jakarta.ojb.devel/3933
http://article.gmane.org/gmane.comp.jakarta.ojb.devel/3920
jakob
Justis Peters wrote:
Hi All!
hi daniel,
there are two ways to define ordering of related objects:
1.) you can define a static ordering in the collection-descriptor.
2.) for dynamic ordering (based on the owner of the related objects) use
a query-cusomizer.
hth
jakob
Daniel Perry wrote:
I've got two classes with a 1:n
I am new to OJB, therefore my questions about it could be very naive...
please be patient :)
My questions concern cache cleaning in a persinstance broker. Please
consider the following example: I have implemented a simple class, Test. Its
main removes all the records from the associated table and i
broker.store() can be called only on persistent objects defined in your
data-model. So if 'doc' is not a persistent object itself, then you will
have to extract all the persistent objects and store them with several
calls to broker.store(), something like this:
broker = getBroker(new PBKey(si
u mean i should code as such?
public static User createUser(){
User user = new User();
user.setLabel("yenonn");
user.setDesignation("programmer");
user.setFullName("Hiu Yen Onn");
user.setPassword("yenonn");
for(int i=0; i<3; i++){
Ro
hi,
let's say, 'doc' contains of bunch of data. let's make it 'doc' contains of
item1, item2 and item3.
if let say, when the ojb persisting 'doc', item1 is persisted successfully,
but, item2 failed. will ojb rollback in this case (make no changes on the
db, even item1 is not persisted)?
how can i
Thank you! This looks great!
Thank you all for your help!
Christian Plate
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
Gesendet: Donnerstag, 16. Oktober 2003 16:23
An: [EMAIL PROTECTED]
Betreff: RE: AW: AW: Is OJB the right solution?
>From a general l
try this code.
try{
result = doc.getResult();
broker = getBroker(new PBKey(site.getDbConnectionAlias()));
broker.beginTransaction();
broker.store(doc, ObjectModificationDefaultImpl.INSERT);
broker.commitTransaction();
Thank you Leandro
I will test your pach I would give the news
-Original Message-
From: Leandro Rodrigo Saad Cruz [mailto:[EMAIL PROTECTED]
Sent: jeudi 16 octobre 2003 20:46
To: OJB Users List
Subject: Re: bug OJB?
Hi. I had the same problem with deleteCollections. A defensive copy
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