Re: Deadlocks mapped to common exception?
Is this just nonsense or is it that no one is interested? How do OJB users handle deadlocks? Oliver On Sun, 5 Dec 2004 01:23:17 +0100, Oliver Zeigermann <[EMAIL PROTECTED]> wrote: > Folks, > > can anyone tell me if OJB is able to find out that a certain SQL > exception really is a deadlock exception and maps it to another common > one (DeadlockException)? This would be very helpful to repeat a > deadlocked transaction. I found no code in OJB that might do such a > job. > > If there is nothing in OBJ the Jakarta Slide project has some initial > code that does this for some dbs. Maybe this could be integrated in > OJB? > > Oliver > - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Criteria through extent (Was: Circular criteria)
hi daniel,
when resolving the path meeting.pdp.createdBy ojb looks for a collection- or
reference-descriptor called 'meeting' and it uses the referenced class to reolve
further path-segements 'pdp'. so if the class referenced by 'meeting' does
not have a reference-descriptor named 'pdp' ojb is not able to resolve this
reference.
there a two solutions right now:
1.) define a reference-descriptor named 'pdp' in your top-class (meeting)
2.) use Criteri#addPathClass('pdp',Appraisal.class) as a hint
hth
jakob
Daniel Perry schrieb:
It apprears that ojb doesnt like criteria at depths that go beyond an
extent.
My criteria is:
crit.addEqualTo("behaviourId", new Integer(id));
crit.addLessThan("rating", new Integer(1));
crit.addEqualTo("meeting.pdp.createdBy", new Integer(mid));
And this generates the following sql (shortened!):
SELECT ... FROM behaviourrating A0 INNER JOIN appraisal A1 ON
A0.meetingId=A1.id WHERE ((A0.behaviourId = '21') AND A0.rating < '1') AND
createdBy = '7'
As you can see, it generates the rating and behaviourId where clauses
properly. But the third clause doesnt work.
The table appraisal is an extent of meeting.
behaviourRating.meeting points to a Meeting, not an appraisal. At the
moment there is only one extent of meeting, but that will change in future,
so ditching meeting isnt an option.
Meeting doesnt have a reference to pdp, but appraisal does.
Should ojb handle this criteria? or should it say that as meeting doesnt
have a 'pdp.createdBy' defined, it will ignore it, even though all the
instanciable subclasses (Appraisal) do have! This would seem fair enough,
although a little annoying!
Could i add a reference (and associated id) for pdp, and employee to
Meeting, but still keep all subclasses in separate tables?
Thanks,
Daniel.
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Re: FEATURE REQUEST : specify foreign-key-attribute to use with colle ction descriptors instead of using primary of container class
hi roger, imo this feature could be useful in some real life scenarios; even without an intermediate class like Acl in your example. but i'd prefer to extend the inverse-foreignkey (called "referencing" in the following snippet, but this is just a temp name). if the referencing attribute is missing we assume the pk of the element-class-ref is used. jakob Janssen, Roger schrieb: Hi guys, i've got a question. I am using 1.0-rc6. Currently, using a collection descriptor, you specify the inverse-foreignkey attribute on the items of the collection, and these attributes are matched with the value of the primary key of the object that contains the collection. However, consider the following (simplified) situation: Document Acl Permission id ---> id <---|id ...| ... |... ...| | aclId aclId -| ... ... I have an class document, containing a foreignkey reference to a class Acl, and i have a class permission containing a foreignkey reference to an acl. The class document has an attribute acl populated by OJB by using a reference descriptor. The class Acl has an collection attribute permissions collected by OJB using a collection descriptor. When a query for documents, using permission criteria, the query becomes complex, OJB joins document, acl and permission, using nested objects in criteria like "acl.permission.value" on a document instances. In plain sql, we could query joining document and permission on document.aclid = permission.aclid. Using OJB, this currently is not possible, because i am not able to define a collection descriptor on document mapping permissions. This would become possible, if we were able to specify a foreignkey-attribute on a collection descriptor. Example: . . element-class-ref="ibanx.security.Permission" auto-retrieve="false" auto-update="false" auto-delete="false"> This collection descriptor defines a collection of Permissions on the document class, using aclId of document as foreignkey, matching it with aclid of Permission. I can use this descriptor for querying purposes, and now OJB only can to join the document and permission tables using nested objects in criteria like "permission.value" on a document instance. Within our app, this kind of join pattern appears several times, sometimes even several times within one query, needless to say that we are experiencing some performance issues when the rather more complex queries are being executed, to a point were the application becomes not usable. I tried to look what i had to change within OJB source code myself, so i could deliver a patch, but i noticed the complexity of the interaction between CollectionDescriptor, XMLHandlers and SQL statement generators. So i do not really know were to start. So my question is, do you think this would be a usefull feature, and might it be implemented in the future. If it is obvious what needs to be changed, can onyone point me in the right direction, so i can patch the 1.0-rc6 version we are still using. thanx, Roger Janssen iBanx - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: PBKey
[EMAIL PROTECTED] wrote: The xml files are in the resources folder wihich is under classes. I tried also to out the files directly in the folder classes - with the same result. Have you removed the old work directory before you restarted? That's sometimes the reason for an error. The changed xml files couldn't be compiled. -- Mit freundlichen Grüßen Thomas Franke Geschäftsführer Leiter Entwicklung The energy for a better world softEnergy GmbH Platz der Freundschaft 1 18059 Rostock fon: +49 381 40 587 535 fax: +49 381 40 587 555 mobil: +49 1715222015 http://www.softenergy.de mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: PBKey
The xml files are in the resources folder wihich is under classes. I tried also to out the files directly in the folder classes - with the same result. [JDO] DEBUG: OjbStoreConnector.begin: connectionReadyForRelease=false org.apache.ojb.broker.PBFactoryException: There was no default-PBKey specified at org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaultPersistenceBroker(Unknown Source) at org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(Unknown Source) at org.apache.ojb.jdori.sql.OjbStoreConnector.begin(Unknown Source) at com.sun.jdori.common.TransactionImpl.beginInternal(Unknown Source) at com.sun.jdori.common.TransactionImpl.begin(Unknown Source) at org.myProject.appli.Demo.storing(Demo.java:97) at org.myProject.appli.Demo.main(Demo.java:110) Exception in thread "main" There must be another mistake. regards
Re: PBKey
[EMAIL PROTECTED] wrote: Hello, I want to start the damo.class from the destination folder of this class. My repository.xml files are in target \classes\resources. How can i set it that he finds this files I remember at first we had this problem too. Put it under \classes. That's all. We have exported our application into a jar file and the repository.xml is in the root in this jar file. It's the same as under \classes. regards Thomas -- Mit freundlichen Grüßen Thomas Franke Geschäftsführer Leiter Entwicklung The energy for a better world softEnergy GmbH Platz der Freundschaft 1 18059 Rostock fon: +49 381 40 587 535 fax: +49 381 40 587 555 mobil: +49 1715222015 http://www.softenergy.de mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: PBKey
If you mean this part of my repository_database.xml, then "yes" i have set it. But it can be possible that there is something wrong in my setting. I use the MySQL 4.1 Server and Java 1.4.2. regards Michael
Re: PBKey
Hello, I want to start the damo.class from the destination folder of this class. My repository.xml files are in target \classes\resources. How can i set it that he finds this files? regards Michael
RE: PBKey
Have you got a default connection-descriptor set up in repository_database.xml properly? Are OJB.properties/repository***.xml (x4) all in classpath? Daniel. > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > Sent: 08 December 2004 10:50 > To: [EMAIL PROTECTED] > Subject: PBKey > > > Hello, > i got setup the database and all Tables. I tried to start my Demo > application bu there is an error: > > org.apache.ojb.broker.PBFactoryException: There was no default-PBKey > specified > at > org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaul > tPersistenceBroker(Unknown > Source) > at > org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceB > roker(Unknown > Source) > at org.apache.ojb.jdori.sql.OjbStoreConnector.begin(Unknown > Source) > at com.sun.jdori.common.TransactionImpl.beginInternal(Unknown > Source) > at com.sun.jdori.common.TransactionImpl.begin(Unknown Source) > at org.myProject.appli.Demo.storing(Demo.java:97) > at org.myProject.appli.Demo.main(Demo.java:110) > Exception in thread "main" > > Do u know what is ment with this massege? What do i have to do to solve > this problem? > > > regards > > Michael - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: PBKey
[EMAIL PROTECTED] wrote: Hello, i got setup the database and all Tables. I tried to start my Demo application bu there is an error: org.apache.ojb.broker.PBFactoryException: There was no default-PBKey specified at org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaultPersistenceBroker(Unknown Source) at org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(Unknown Source) at org.apache.ojb.jdori.sql.OjbStoreConnector.begin(Unknown Source) at com.sun.jdori.common.TransactionImpl.beginInternal(Unknown Source) at com.sun.jdori.common.TransactionImpl.begin(Unknown Source) at org.myProject.appli.Demo.storing(Demo.java:97) at org.myProject.appli.Demo.main(Demo.java:110) Exception in thread "main" Do u know what is ment with this massege? What do i have to do to solve this problem? The usual reasons for this error are either that OJB couldn't find the repository.xml (per default it should be in the directory where you start the app; if you're using the ojb-blank then you should start the app in build/resources), or that none of you jdbc-connection-descriptor entries in repository_database.xml has a default-connection="true" setting. Tom - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Criteria through extent (Was: Circular criteria)
It apprears that ojb doesnt like criteria at depths that go beyond an
extent.
My criteria is:
crit.addEqualTo("behaviourId", new Integer(id));
crit.addLessThan("rating", new Integer(1));
crit.addEqualTo("meeting.pdp.createdBy", new Integer(mid));
And this generates the following sql (shortened!):
SELECT ... FROM behaviourrating A0 INNER JOIN appraisal A1 ON
A0.meetingId=A1.id WHERE ((A0.behaviourId = '21') AND A0.rating < '1') AND
createdBy = '7'
As you can see, it generates the rating and behaviourId where clauses
properly. But the third clause doesnt work.
The table appraisal is an extent of meeting.
behaviourRating.meeting points to a Meeting, not an appraisal. At the
moment there is only one extent of meeting, but that will change in future,
so ditching meeting isnt an option.
Meeting doesnt have a reference to pdp, but appraisal does.
Should ojb handle this criteria? or should it say that as meeting doesnt
have a 'pdp.createdBy' defined, it will ignore it, even though all the
instanciable subclasses (Appraisal) do have! This would seem fair enough,
although a little annoying!
Could i add a reference (and associated id) for pdp, and employee to
Meeting, but still keep all subclasses in separate tables?
Thanks,
Daniel.
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
PBKey
Hello, i got setup the database and all Tables. I tried to start my Demo application bu there is an error: org.apache.ojb.broker.PBFactoryException: There was no default-PBKey specified at org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaultPersistenceBroker(Unknown Source) at org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(Unknown Source) at org.apache.ojb.jdori.sql.OjbStoreConnector.begin(Unknown Source) at com.sun.jdori.common.TransactionImpl.beginInternal(Unknown Source) at com.sun.jdori.common.TransactionImpl.begin(Unknown Source) at org.myProject.appli.Demo.storing(Demo.java:97) at org.myProject.appli.Demo.main(Demo.java:110) Exception in thread "main" Do u know what is ment with this massege? What do i have to do to solve this problem? regards Michael
RE: p6spy
Well, i added: com.mysql.jdbc.Driver a = new com.mysql.jdbc.Driver(); com.p6spy.engine.spy.P6SpyDriver b = new com.p6spy.engine.spy.P6SpyDriver(); Just to verify that it was all there, and it came up with a different error - couldnt find spy.properties in the classpath! Copied that accross, and it seems to be working. In the faq i found it doesnt mention that you need to copy this file into the classpath! Daniel. > -Original Message- > From: Armin Waibel [mailto:[EMAIL PROTECTED] > Sent: 07 December 2004 19:28 > To: OJB Users List > Subject: Re: p6spy > > > Daniel Perry wrote: > > Simple question - how do i use p6spy? > > > > I've recompiiled ojb with p6spy, and set mysql as the 'real' > driver. I've > > copied the jar file and p6spy's jar. > > > > p6spy, mysql driver jar really in classpath, typo in realdriver property? > Sorry, that's all cross my my mind ;-) > > Armin > > > > I've changed my repository to use p6spy (see below), and added > the driver: > > > > > jcd-alias="default" > > default-connection="true" > > platform="MySQL" > > jdbc-level="2.0" > > driver="com.p6spy.engine.spy.P6SpyDriver" > > protocol="jdbc" > > subprotocol="mysql" > > dbalias="//localhost/lecrossingpdp" > > username="" > > password="" > > batch-mode="false" > >> > > > > But i get the error: > > [org.apache.ojb.broker.accesslayer.ConnectionFactoryAbstractImpl] ERROR: > > Error getting Connection from DriverManager with url > > (jdbc:mysql://localhost/lecrossingpdp) and driver > > (com.p6spy.engine.spy.P6SpyDriver) > > No suitable driver > > java.sql.SQLException: No suitable driver > > at java.sql.DriverManager.getConnection(Unknown Source) > > at java.sql.DriverManager.getConnection(Unknown Source) > > at > > > org.apache.ojb.broker.accesslayer.ConnectionFactoryAbstractImpl.ne > wConnectio > > nFromDriverManager(ConnectionFactoryAbstractImpl.java:253) > > at > > > org.apache.ojb.broker.accesslayer.ConnectionFactoryPooledImpl$ConP > oolFactory > > .makeObject(ConnectionFactoryPooledImpl.java:231) > > at > > > org.apache.commons.pool.impl.GenericObjectPool.borrowObject(Generi > cObjectPoo > > l.java:816) > > ... > > > > > > Any ideas? > > What have i missd? > > > > Thanks, > > Daniel. > > > > > > - > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > - > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
FEATURE REQUEST : specify foreign-key-attribute to use with colle ction descriptors instead of using primary of container class
Hi guys, i've got a question. I am using 1.0-rc6. Currently, using a collection descriptor, you specify the inverse-foreignkey attribute on the items of the collection, and these attributes are matched with the value of the primary key of the object that contains the collection. However, consider the following (simplified) situation: Document Acl Permission id ---> id <---|id ...| ... |... ...| | aclId aclId -| ... ... I have an class document, containing a foreignkey reference to a class Acl, and i have a class permission containing a foreignkey reference to an acl. The class document has an attribute acl populated by OJB by using a reference descriptor. The class Acl has an collection attribute permissions collected by OJB using a collection descriptor. When a query for documents, using permission criteria, the query becomes complex, OJB joins document, acl and permission, using nested objects in criteria like "acl.permission.value" on a document instances. In plain sql, we could query joining document and permission on document.aclid = permission.aclid. Using OJB, this currently is not possible, because i am not able to define a collection descriptor on document mapping permissions. This would become possible, if we were able to specify a foreignkey-attribute on a collection descriptor. Example: This collection descriptor defines a collection of Permissions on the document class, using aclId of document as foreignkey, matching it with aclid of Permission. I can use this descriptor for querying purposes, and now OJB only can to join the document and permission tables using nested objects in criteria like "permission.value" on a document instance. Within our app, this kind of join pattern appears several times, sometimes even several times within one query, needless to say that we are experiencing some performance issues when the rather more complex queries are being executed, to a point were the application becomes not usable. I tried to look what i had to change within OJB source code myself, so i could deliver a patch, but i noticed the complexity of the interaction between CollectionDescriptor, XMLHandlers and SQL statement generators. So i do not really know were to start. So my question is, do you think this would be a usefull feature, and might it be implemented in the future. If it is obvious what needs to be changed, can onyone point me in the right direction, so i can patch the 1.0-rc6 version we are still using. thanx, Roger Janssen iBanx
