Re: auto increment not working
Thanks Glenn, Yes I am using OJB rc6. And I have also tried without using any sequence manager. Do I neeed to create my own sequence manager. How will it help and how do I do that ? Please tell me if you have any idea. Thanks again. Regards, Nilesh. - Original Message - From: "Glenn Barnard" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, April 23, 2004 8:56 PM Subject: RE: auto increment not working > Your settings look good. I use this technique with MS SQL Server and all is > working well. Please note which version of OJB you're using. Hopefully, its > rc6! > > >From: "Nilesh" <[EMAIL PROTECTED]> > >Reply-To: "OJB Users List" <[EMAIL PROTECTED]> > >To: <[EMAIL PROTECTED]> > >CC: <[EMAIL PROTECTED]> > >Subject: auto increment not working > >Date: Sun, 22 Feb 2004 19:40:34 +0530 > > > >In my OJB (using PersistenceBroker ) application auto-increment is not > >working. > > > >I am using MySQL in which I have also used the auto-increment constraint > >for the Primarykey ( bigint(20) ) > > > > > >For my database definition i have used the "SequenceManagerNativeImpl" > > > > >className="org.apache.ojb.broker.util.sequence.SequenceManagerNativeImpl"> > > >attribute-value="true"/> > > > > > > > >also in the mapping file i have > > > > >class="com.haystack.emailmarketingchoice.member.MemberVO" > >table="tblMember"> > > > > >jdbc-type="BIGINT" primarykey="true" autoincrement="true" > >access="readonly" /> > > > > > > > > > >i have also tried without the --> access="readonly" > > > >but it generates a new 20 digit "auto-increment" number only for the > >first insert, for the subsequent inserts it generates the same number and a > >Duplicate Entry error arises. > > > >I have also tried the following sequence managers > > > >SequenceManagerMySQLImpl > >SequenceManagerSeqHiLoImpl > > > >with and without these attributes > > > > > > > > > > > > > >But ALL Failed. > >Have any one of you tried this. Please let me know. > >Thanks in advance for your interest in my problem. > > > >Regards, > >Arjun. > > > > > > > > > > > > > > _ > From must-see cities to the best beaches, plan a getaway with the Spring > Travel Guide! http://special.msn.com/local/springtravel.armx > > > - > 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]
Re: Exception from RsIterator
Hello week end mid-night!
I know the reason. Actually, after I get Iterator, this time OJB hasn't
get whole data set yet. So I only get a interface, every time I invoke
next(), the Iterator(RsIterator) will retrieve the data from database.
So I can't return Iterator from a method. Because, before return the
Iterator the following code will be executed:
} finally {
if (broker != null) {
broker.close();
}
}
my database connection has been close before I process the Iterator.
I have to retrieve the data from Iterator manually before I return. I
guess OJB intend to minimize the database access from Iterator mode.
Thanks,
Wallace
Info wrote:
Hello Everybody! I am working through the week end.
-
J2SE 1.4.2_04 + OJB 1.0 rc6 + Struts 1.1 + J2EE (just in classpath)
-
I am geting a report query by:
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
Criteria crit = new Criteria();
ReportQueryByCriteria q =
QueryFactory.newReportQuery(ThreadDto.class, crit);
q.setAttributes(new String[]{"priority", "username"});
Iterator it = broker.getReportQueryIteratorByQuery(q);
while (it.hasNext()){
it.next();..
.
}
but from line: while (it.hasNext()) get the following exception
org.apache.ojb.broker.accesslayer.RsIterator$ResourceClosedException:
Resources no longer reachable, RsIterator will be automatic cleaned up
on PB.close/.commitTransaction/.abortTransaction
at
org.apache.ojb.broker.accesslayer.RsIterator.getRsAndStmt(RsIterator.java:876)
at
org.apache.ojb.broker.accesslayer.RsIterator.hasNext(RsIterator.java:228)
I tried to use Query instead of report query, and let it returns a
Colleciton, everything is fine.
Later, I still used Query, but ask it return a Iterator (by method:
getIteratorByQuery()), I get the same exception as above. It looks
like not caused by report query but by Iterator return.
Please give advice,
Thanks!
Wallace
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Exception from RsIterator
Hello Everybody! I am working through the week end.
-
J2SE 1.4.2_04 + OJB 1.0 rc6 + Struts 1.1 + J2EE (just in classpath)
-
I am geting a report query by:
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
Criteria crit = new Criteria();
ReportQueryByCriteria q =
QueryFactory.newReportQuery(ThreadDto.class, crit);
q.setAttributes(new String[]{"priority", "username"});
Iterator it = broker.getReportQueryIteratorByQuery(q);
while (it.hasNext()){
it.next();..
.
}
but from line: while (it.hasNext()) get the following exception
org.apache.ojb.broker.accesslayer.RsIterator$ResourceClosedException:
Resources no longer reachable, RsIterator will be automatic cleaned up
on PB.close/.commitTransaction/.abortTransaction
at
org.apache.ojb.broker.accesslayer.RsIterator.getRsAndStmt(RsIterator.java:876)
at
org.apache.ojb.broker.accesslayer.RsIterator.hasNext(RsIterator.java:228)
I tried to use Query instead of report query, and let it returns a
Colleciton, everything is fine.
Later, I still used Query, but ask it return a Iterator (by method:
getIteratorByQuery()), I get the same exception as above. It looks like
not caused by report query but by Iterator return.
Please give advice,
Thanks!
Wallace
-
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Re: Code in two table join
hi wallace,
it's not necessary to join manually, ojb will do it for you:
Criteria crit = new Criteria();
ReportQueryByCriteria q = QueryFactory.newReportQuery(A.class, crit);
q.setAttributes(new String[] {"xxx", "yyy", "rel_b.zzz" });
Iterator it = broker.getReportQueryIteratorByQuery(q);
there must be a relationship-definition from class A to B named 'rel_b' in the
repository.
jakob
Info wrote:
Hello,
I tried the following code to select a join, but get error:
Criteria crit = new Criteria();
crit.addEqualToColumn("A.xxx", "B.xxx");
ReportQueryByCriteria q =
QueryFactory.newReportQuery(A.class, crit);
q.setAttributes(new String[] {"A.xxx", "A.yyy",
"B.zzz" });
Iterator it = broker.getReportQueryIteratorByQuery(q);
( In the case, for string "A.xxx" or "B.zzz", what name should I use as
A or B? The physical table name or class name represented or other name?)
SQL statement:
SELECT A.xxx, A.yyy, B.zzz
FROM A JOIN B
ON A.xxx = B.xxx
Please help!
Thanks!
Wallace
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Code in two table join
Hello,
I tried the following code to select a join, but get error:
Criteria crit = new Criteria();
crit.addEqualToColumn("A.xxx", "B.xxx");
ReportQueryByCriteria q =
QueryFactory.newReportQuery(A.class, crit);
q.setAttributes(new String[] {"A.xxx", "A.yyy", "B.zzz" });
Iterator it = broker.getReportQueryIteratorByQuery(q);
( In the case, for string "A.xxx" or "B.zzz", what name should I use as
A or B? The physical table name or class name represented or other name?)
SQL statement:
SELECT A.xxx, A.yyy, B.zzz
FROM A JOIN B
ON A.xxx = B.xxx
Please help!
Thanks!
Wallace
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Re: Description Repositories at Thread level
Armin Waibel apache.org> writes: Armin, Thank you so much. I had already done everything that you had said, but had some problems with my Thread execution. Your hint about ThreadLocal helped out. I was not making/storing the descriptor changes in the run() method of my thread. I was doing it in some other method of my object that extended Thread, but the execution was happening in the main() Thread, this caused the default descriptors to be over-written. OJB has greatly decreased the time I use to spend on writing sql. Thanks again, for a great product and excellent "free" support Regards, Sridhar - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Trying to return an unknown connection2!
Hi Guido, > > Any ideas what's going on there? I only answer to say "No, I don't have a clue". I assume (maybe I'm completely wrong ;-)) that JBoss has problems in handling the connections/DataSources associated with the running tx in a proper way. Your direct connection instance will be associated with the suspended tx, within the new tx OJB lookup a new connection, do all work and close the connection. It seems that the used connection is not vaild in jboss TxConnectionManager...bla, bla Reached the line count for a "do my best answer" ;-) regards, Armin Guido Beutler wrote: Hello, I've got a strange problem with RC6 at JBoss 3.2.3. I've got a statefull and a stateless session bean. The stateless session bean contains all OJB stuff. The statefull facade accesses some tables via JDBC directly. That stateless session OJB bean has transaction attribute RequiresNew. The facade runs with Required. Both ejb's are container managed. If a method allocates a JDBC Connection from data source and then access the OJB EJB the following exception is thrown. java.lang.IllegalStateException: Trying to return an unknown connection2! [EMAIL PROTECTED] at org.jboss.resource.connectionmanager.CachedConnectionManager.unregisterConnection(CachedConnectionManager.java:330) at org.jboss.resource.connectionmanager.TxConnectionManager$TxConnectionEventListener.connectionClosed(TxConnectionManager.java:539) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.closeHandle(BaseWrapperManagedConnection.java:296) at org.jboss.resource.adapter.jdbc.WrappedConnection.close(WrappedConnection.java:117) at org.apache.ojb.broker.util.WrappedConnection.close(WrappedConnection.java:124) at org.apache.ojb.broker.util.pooling.ByPassConnection.close(ByPassConnection.java:64) at org.apache.ojb.broker.accesslayer.ConnectionFactoryAbstractImpl.releaseConnection(ConnectionFactoryAbstractImpl.java:79) at org.apache.ojb.broker.accesslayer.ConnectionManagerImpl.releaseConnection(ConnectionManagerImpl.java:286) at org.apache.ojb.broker.core.PersistenceBrokerFactorySyncImpl$PersistenceBrokerSyncImpl.beforeCompletion(PersistenceBrokerFactorySyncImpl.jav a:177) at org.apache.ojb.broker.core.PersistenceBrokerFactorySyncImpl$TransactionBox.beforeCompletion(PersistenceBrokerFactorySyncImpl.java:329) at org.jboss.tm.TransactionImpl.doBeforeCompletion(TransactionImpl.java:1308) at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:347) at org.jboss.ejb.plugins.TxInterceptorCMT.endTransaction(TxInterceptorCMT.java:398) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:325) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128) at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331) at org.jboss.ejb.Container.invoke(Container.java:700) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546) at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:101) at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:90) at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46) at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:45) at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:100) at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:85) I've got 2 workarounds. 1) If I change RequiresNew at the OJB EJB into Required the problem disappears. 2) If the facade does no access a JDBC connection the problem disappears too. Any ideas what's going on there? best regards, Guido - 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]
Re: Problem with sequence manager
Guillaume Nodet wrote:
I only added the following method:
public static void clearCache() {
if (sequencesMap != null) {
sequencesMap.clear();
}
}
It should be no problem to add such a method, but I can't change the
sequence manager interface (maybe for 1.1), so you have to cast. Maybe
we call the method 'reset()' and introduce this method in sequence
manager interface for 1.1.
In reset() method depended on the implementation the sequence manager
was set to an initial state.
What do you think? Better method name?
regards,
Armin
and called it when i destroy the tables, and everything
works fine now.
-Message d'origine-
De : Guillaume Nodet [mailto:[EMAIL PROTECTED]
Envoyé : vendredi 23 avril 2004 16:25
À : OJB Users List
Objet : Problem with sequence manager
Hi,
In my application, i can dynamically create and drop the tables
for storing ojb objects. The problem is that when i insert some
data, drop the tables, recreate them, and insert data, the sequence
manager is not re-initialized (i use SequenceManagerHighLowImpl)
so when inserting data in the newly created tables, the sequence
manager reuses caches sequences (in the sequencesMap), instead
of creating new ones. So when a sequence runs out of id, it looks
into the database, creates a new sequence and thus ids overlapp.
Could it be possible to add a method for clearing the cache of
sequences (stored in the sequencesMap attribute) ?
I will for the moment use my own sequence manager (a copy of
SequenceManagerHighLowImpl with the above method).
Thanks,
Guillaume
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Re: Problem with clearing cache
Hi Guillaume, Guillaume Nodet wrote: What about using runtime byte-code enhancement, as you mentioned it, to extends classes to dynamically add properties for storing AKs, thus removing the need of AnonymousPersistentField ... you stir up a hornet's nest ;-) Many people don't like manipulation of persistent object classes (dynamically or pre-compiled). Another problem will be the use of the "correct" classloader when dynamically enhancement was used and the user can't create persistent objects by it's own. But indeed byte code enhancement will solve or simplify many problems (e.g. anonymous fields, object state detection, object locking, ...). I don't have experience in bytecode manipulation (only played a little with ASM) but all suggestions, pros and cons are welcome. regards, Armin Guillaume -Message d'origine- De : Armin Waibel [mailto:[EMAIL PROTECTED] Envoyé : jeudi 22 avril 2004 15:01 À : OJB Users List Objet : Re: Problem with clearing cache Hi Guillaume,Brian, I think the anonymous key (AK) feature should be modified/rewriten because currently it is object identity based. This means you will loose all AK information when the object will be de-/serialized or copied. The upcoming two-level cache will do so and the OTM implementation too (and my "feeling" is that this will cause problems). The AK in conjunction with 1:1 references are always be save (I think), because when the AK information is lost, we can use the reference to re-create the AK information. > I'm willingfull to help refactoring this part, but i'd like to > have guidelines sorry I don't have any ideas (without byte-code enhancement ;-)) > if anonymous keys are integrated within the existing cache system, > but i have no ideas on how to do it. this will be difficult, because AK implementation does not know about the cache and the cache could be per class-descriptor, per connection or global. regards, Armin Guillaume Nodet wrote: I use both anonymous PK's and FK's. But the use i do of anonymous primary keys is limited to objects that belongs to collections of main objects. Main objects have *real* primary keys and only these ones are used directly in the broker (all collections are prefetched) and cached. So i think that using anonymous pk's in my case is safe (if my understanding is good, problems can arise when using anonymous pk's in distributed environnments). So the main problem is the caching system for anonymous keys (either pk or fk) : * keys are kept in a cache specific to the field * this cache can not be accessed by any means so no clear is possible * this cache can not be a per-broker cache * anonymous persistent fields implementation can not be extended or overriden I'm willingfull to help refactoring this part, but i'd like to have guidelines on how to do it... I think it would be great if anonymous keys are integrated within the existing cache system, but i have no ideas on how to do it. Guillaume -Message d'origine- De : Brian McCallister [mailto:[EMAIL PROTECTED] Envoyé : jeudi 22 avril 2004 14:06 À : OJB Users List Objet : Re: Problem with clearing cache Anonymous PK's are risky things -- I apologize for using them in the original anonymous keys tutorial. Anonymous FK's are great, and not using them is usually a bad ida in my opinion =) I don't think the anonymous PK issues you are having will be resolved very soon, the anonymous key functionality wasn't really designed for PK usage, but for FK usage. I completely feel that it would be good to be able to use them for PK's as well, but my slate is full at the moment with JDO stuff =( I don't know about everyone else. Any chance *you* want to dig into it? ;-) -Brian On Apr 22, 2004, at 7:55 AM, Guillaume Nodet wrote: It also seems that cached anonymous keys are not removed from the cache when an object is deleted from database. Will these problems be solved, or should i try not to use anonymous keys ? Guillaume -Message d'origine- De : Guillaume Nodet [mailto:[EMAIL PROTECTED] Envoyé : mercredi 21 avril 2004 14:42 À : OJB Users List Objet : Problem with clearing cache I need to clear the ojb cache at some point in my program (namely after deleting all data in the database). The problem i have is that i use anonymous primary keys and the caches associated with the anonymous fields are not cleared. Would it be possible to had some mean of clearing these caches ? The problem is that at some time, i've got errors when inserting objects. I think that the key for the failing object is in cache but not in the database so when a foreign key references it, the insertion fails. Thanks, Guillaume Nodet - 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 PROTE
Trying to return an unknown connection2!
Hello, I've got a strange problem with RC6 at JBoss 3.2.3. I've got a statefull and a stateless session bean. The stateless session bean contains all OJB stuff. The statefull facade accesses some tables via JDBC directly. That stateless session OJB bean has transaction attribute RequiresNew. The facade runs with Required. Both ejb's are container managed. If a method allocates a JDBC Connection from data source and then access the OJB EJB the following exception is thrown. java.lang.IllegalStateException: Trying to return an unknown connection2! [EMAIL PROTECTED] at org.jboss.resource.connectionmanager.CachedConnectionManager.unregisterConnection(CachedConnectionManager.java:330) at org.jboss.resource.connectionmanager.TxConnectionManager$TxConnectionEventListener.connectionClosed(TxConnectionManager.java:539) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.closeHandle(BaseWrapperManagedConnection.java:296) at org.jboss.resource.adapter.jdbc.WrappedConnection.close(WrappedConnection.java:117) at org.apache.ojb.broker.util.WrappedConnection.close(WrappedConnection.java:124) at org.apache.ojb.broker.util.pooling.ByPassConnection.close(ByPassConnection.java:64) at org.apache.ojb.broker.accesslayer.ConnectionFactoryAbstractImpl.releaseConnection(ConnectionFactoryAbstractImpl.java:79) at org.apache.ojb.broker.accesslayer.ConnectionManagerImpl.releaseConnection(ConnectionManagerImpl.java:286) at org.apache.ojb.broker.core.PersistenceBrokerFactorySyncImpl$PersistenceBrokerSyncImpl.beforeCompletion(PersistenceBrokerFactorySyncImpl.jav a:177) at org.apache.ojb.broker.core.PersistenceBrokerFactorySyncImpl$TransactionBox.beforeCompletion(PersistenceBrokerFactorySyncImpl.java:329) at org.jboss.tm.TransactionImpl.doBeforeCompletion(TransactionImpl.java:1308) at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:347) at org.jboss.ejb.plugins.TxInterceptorCMT.endTransaction(TxInterceptorCMT.java:398) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:325) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128) at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331) at org.jboss.ejb.Container.invoke(Container.java:700) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546) at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:101) at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:90) at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46) at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:45) at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:100) at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:85) I've got 2 workarounds. 1) If I change RequiresNew at the OJB EJB into Required the problem disappears. 2) If the facade does no access a JDBC connection the problem disappears too. Any ideas what's going on there? best regards, Guido - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: auto increment not working
Your settings look good. I use this technique with MS SQL Server and all is working well. Please note which version of OJB you're using. Hopefully, its rc6! From: "Nilesh" <[EMAIL PROTECTED]> Reply-To: "OJB Users List" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> CC: <[EMAIL PROTECTED]> Subject: auto increment not working Date: Sun, 22 Feb 2004 19:40:34 +0530 In my OJB (using PersistenceBroker ) application auto-increment is not working. I am using MySQL in which I have also used the auto-increment constraint for the Primarykey ( bigint(20) ) For my database definition i have used the "SequenceManagerNativeImpl" also in the mapping file i have i have also tried without the --> access="readonly" but it generates a new 20 digit "auto-increment" number only for the first insert, for the subsequent inserts it generates the same number and a Duplicate Entry error arises. I have also tried the following sequence managers SequenceManagerMySQLImpl SequenceManagerSeqHiLoImpl with and without these attributes But ALL Failed. Have any one of you tried this. Please let me know. Thanks in advance for your interest in my problem. Regards, Arjun. _ From must-see cities to the best beaches, plan a getaway with the Spring Travel Guide! http://special.msn.com/local/springtravel.armx - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Problem with sequence manager
I only added the following method:
public static void clearCache() {
if (sequencesMap != null) {
sequencesMap.clear();
}
}
and called it when i destroy the tables, and everything
works fine now.
-Message d'origine-
De : Guillaume Nodet [mailto:[EMAIL PROTECTED]
Envoyé : vendredi 23 avril 2004 16:25
À : OJB Users List
Objet : Problem with sequence manager
Hi,
In my application, i can dynamically create and drop the tables
for storing ojb objects. The problem is that when i insert some
data, drop the tables, recreate them, and insert data, the sequence
manager is not re-initialized (i use SequenceManagerHighLowImpl)
so when inserting data in the newly created tables, the sequence
manager reuses caches sequences (in the sequencesMap), instead
of creating new ones. So when a sequence runs out of id, it looks
into the database, creates a new sequence and thus ids overlapp.
Could it be possible to add a method for clearing the cache of
sequences (stored in the sequencesMap attribute) ?
I will for the moment use my own sequence manager (a copy of
SequenceManagerHighLowImpl with the above method).
Thanks,
Guillaume
-
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Problem with sequence manager
Hi, In my application, i can dynamically create and drop the tables for storing ojb objects. The problem is that when i insert some data, drop the tables, recreate them, and insert data, the sequence manager is not re-initialized (i use SequenceManagerHighLowImpl) so when inserting data in the newly created tables, the sequence manager reuses caches sequences (in the sequencesMap), instead of creating new ones. So when a sequence runs out of id, it looks into the database, creates a new sequence and thus ids overlapp. Could it be possible to add a method for clearing the cache of sequences (stored in the sequencesMap attribute) ? I will for the moment use my own sequence manager (a copy of SequenceManagerHighLowImpl with the above method). Thanks, Guillaume - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
auto increment not working
In my OJB (using PersistenceBroker ) application auto-increment is not working. I am using MySQL in which I have also used the auto-increment constraint for the Primarykey ( bigint(20) ) For my database definition i have used the "SequenceManagerNativeImpl" also in the mapping file i have i have also tried without the --> access="readonly" but it generates a new 20 digit "auto-increment" number only for the first insert, for the subsequent inserts it generates the same number and a Duplicate Entry error arises. I have also tried the following sequence managers SequenceManagerMySQLImpl SequenceManagerSeqHiLoImpl with and without these attributes But ALL Failed. Have any one of you tried this. Please let me know. Thanks in advance for your interest in my problem. Regards, Arjun.
RE: OJB - Torque - Incremental sql
The commons-sql library is able to handle this, but i've not tested it. Guillaume -Message d'origine- De : Thomas Dudziak [mailto:[EMAIL PROTECTED] Envoye : vendredi 23 avril 2004 11:16 A : OJB Users List Objet : Re: OJB - Torque - Incremental sql On Fri, 23 Apr 2004, Frank Renaers wrote: > We are using Torque to describe our database schema. > > We are looking now for a tool which compares 2 Torque schemas (the old > and the new one) and > > generates incremental sql. > > Does this already exists ? Havn't heard of something like this, though you might want to ask on the torque user mailing list, as well. Perhaps Torque or commons-sql (which also can read Torque schemas) create 'ALTER TABLE' statements ? I guess you could try a temporary database, generate it using the old schema, then applying the new schema on the same database to see what Torque and commons-sql generate. Otherwise you could use Torque as a library, more precisly its metadata part, then read in both schemas and compare them on the object level (I don't know nothing of the Torque metadata handling, but it is probably either DOM, or a specific object model.) Tom - 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]
RE: Problem with clearing cache
What about using runtime byte-code enhancement, as you mentioned it, to extends classes to dynamically add properties for storing AKs, thus removing the need of AnonymousPersistentField ... Guillaume -Message d'origine- De : Armin Waibel [mailto:[EMAIL PROTECTED] Envoyé : jeudi 22 avril 2004 15:01 À : OJB Users List Objet : Re: Problem with clearing cache Hi Guillaume,Brian, I think the anonymous key (AK) feature should be modified/rewriten because currently it is object identity based. This means you will loose all AK information when the object will be de-/serialized or copied. The upcoming two-level cache will do so and the OTM implementation too (and my "feeling" is that this will cause problems). The AK in conjunction with 1:1 references are always be save (I think), because when the AK information is lost, we can use the reference to re-create the AK information. > I'm willingfull to help refactoring this part, but i'd like to > have guidelines sorry I don't have any ideas (without byte-code enhancement ;-)) > if anonymous keys are integrated within the existing cache system, > but i have no ideas on how to do it. this will be difficult, because AK implementation does not know about the cache and the cache could be per class-descriptor, per connection or global. regards, Armin Guillaume Nodet wrote: > I use both anonymous PK's and FK's. But the use i do of anonymous > primary keys is limited to objects that belongs to collections of > main objects. Main objects have *real* primary keys and only > these ones are used directly in the broker (all collections are > prefetched) and cached. So i think that using anonymous pk's in > my case is safe (if my understanding is good, problems can arise > when using anonymous pk's in distributed environnments). > > So the main problem is the caching system > for anonymous keys (either pk or fk) : > * keys are kept in a cache specific to the field > * this cache can not be accessed by any means so no clear > is possible > * this cache can not be a per-broker cache > * anonymous persistent fields implementation > can not be extended or overriden > > I'm willingfull to help refactoring this part, but i'd like to > have guidelines on how to do it... > I think it would be great > if anonymous keys are integrated within the existing cache system, > but i have no ideas on how to do it. > > Guillaume > > > -Message d'origine- > De : Brian McCallister [mailto:[EMAIL PROTECTED] > Envoyé : jeudi 22 avril 2004 14:06 > À : OJB Users List > Objet : Re: Problem with clearing cache > > > Anonymous PK's are risky things -- I apologize for using them in the > original anonymous keys tutorial. Anonymous FK's are great, and not > using them is usually a bad ida in my opinion =) > > I don't think the anonymous PK issues you are having will be resolved > very soon, the anonymous key functionality wasn't really designed for > PK usage, but for FK usage. I completely feel that it would be good to > be able to use them for PK's as well, but my slate is full at the > moment with JDO stuff =( > > I don't know about everyone else. Any chance *you* want to dig into it? > ;-) > > -Brian > > On Apr 22, 2004, at 7:55 AM, Guillaume Nodet wrote: > > >>It also seems that cached anonymous keys are not removed from >>the cache when an object is deleted from database. >>Will these problems be solved, or should i try not to use >>anonymous keys ? >> >>Guillaume >> >>-Message d'origine- >>De : Guillaume Nodet [mailto:[EMAIL PROTECTED] >>Envoyé : mercredi 21 avril 2004 14:42 >>À : OJB Users List >>Objet : Problem with clearing cache >> >> >>I need to clear the ojb cache at some point in my program >>(namely after deleting all data in the database). >>The problem i have is that i use anonymous primary keys and >>the caches associated with the anonymous fields are not cleared. >>Would it be possible to had some mean of clearing these caches ? >> >>The problem is that at some time, i've got errors when inserting >>objects. I think that the key for the failing object is in cache >>but not in the database so when a foreign key references it, >>the insertion fails. >> >>Thanks, >>Guillaume Nodet >> >>- >>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] > > > > - > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > --
Re: OJB - Torque - Incremental sql
On Fri, 23 Apr 2004, Frank Renaers wrote: > We are using Torque to describe our database schema. > > We are looking now for a tool which compares 2 Torque schemas (the old > and the new one) and > > generates incremental sql. > > Does this already exists ? Havn't heard of something like this, though you might want to ask on the torque user mailing list, as well. Perhaps Torque or commons-sql (which also can read Torque schemas) create 'ALTER TABLE' statements ? I guess you could try a temporary database, generate it using the old schema, then applying the new schema on the same database to see what Torque and commons-sql generate. Otherwise you could use Torque as a library, more precisly its metadata part, then read in both schemas and compare them on the object level (I don't know nothing of the Torque metadata handling, but it is probably either DOM, or a specific object model.) Tom - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
OJB - Torque - Incremental sql
Hi, We are using Torque to describe our database schema. We are looking now for a tool which compares 2 Torque schemas (the old and the new one) and generates incremental sql. Does this already exists ? Thanks, Frank Renaers Ikan Software
