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hibernate-dev April 2007

hibernate-dev@lists.jboss.org

17 participants
199 discussions

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dynamic entities

by Iyad Elian

Hi hibernate-dev, I have an interest in modifying hibernate core to support an alternative persistence model common in some domains like the medical domain. how do I go about it? here is a small description of the problem and a solution: problem: Objects map one to one to tables as specified at design time which is normally what most applications require. Object relational mapping runtimes like hibernate core cater well for this common case. However, some applications require a catalog of entities and their attributes. Other applications require a more dynamic mapping to a set of few fixed tables regardless of the number of domain objects. solution: Persist entities to an EAVCR meta-model which stores values of attributes in a generic Data table. The values can only be stored as a generic type (String) but types can be tightened at runtime. This also means that all dynamic entities, heterogeneous as they maybe, are stored in one table and cataloged by a few more. Using such model complicates the native SQL to access the data so it maybe necessary to map the SQL to hide such complexity. Fortunately, domains using this model require entity centric queries (load all data for a patient) which is more coarse grained. does this sound interesting to anyone on this list? Thanks. --Iyad --------------------------------- Ahhh...imagining that irresistible "new car" smell? Check outnew cars at Yahoo! Autos.

16 years, 12 months

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NullpointerException in DefaultDeleteEventListener.deleteTransientEntity - HHH-2146

by Donnchadh Ó Donnabháin

Given that there is now a unit test and a proposed fix, would it be possible to schedule this for 3.2.4 ? http://opensource.atlassian.com/projects/hibernate/browse/HHH-2146 Thanks Donnchadh

17 years

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Hibernate testsuite failures

by David Vrzalik

Hello, I have been given notice that some of the tests from Hibernate testsuite are expected to fail. My question is: are these tests just marked to be buggy and planned to be rewritten, or are their failure required to indicate correct behavior? Many thanks in advance David Vrzalik

17 years

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hibernate-mysql-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

17 years

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hibernate-mysql50-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

17 years

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hibernate-oracle10-testsuite build.18 Build Successful

by jboss-qa-internal＠redhat.com

17 years

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hibernate-sqlserver-msjdbc-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

17 years

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hibernate-mysql50-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

17 years

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hibernate-sqlserver-jtds-testsuite build.18 Build Successful

by jboss-qa-internal＠redhat.com

17 years

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JPA: WAS 6.1 EntityManager performance and NPE in FromClause.findIntendedAliasedFromElementBasedOnCrazyJPARequirements

by Jesper Udby

Hello, just trying to follow the guidelines in the section "READ THIS BEFORE USING JIRA!", I'm submitting minor changes to the classes WebSphereExtendedJTATransactionLookup and FromClause for anyone to review... 1. We are using Hibernate JPA with WebSphere 6.1 and are experiencing serious bad performance. We are also seeing alot of "INFO org.hibernate.util.NamingHelper.JNDI InitialContext properties:{}" in the logs (as described in http://forum.hibernate.org/viewtopic.php?t=970086). Our investigations shows that the logging statements come from NamingHelper.getInitialContext(). Also, we can se that just creating an EntityManager from an EntitManagerFactory results in 4 times InitialContext creation and 4 times lookup of the WAS specific "java:comp/websphere/ExtendedJTATransaction". A simple transaction results in 7-8 lookups ! By looking at a similar implementation in OpenJPA's (openjpa-0.9.6-incubating) AutomaticManagedRuntime / WASManagedRuntime, it appears that OpenJPA only looks up the "extended transaction" object once, and stores it in a static. I've changed the WebSphereExtendedJTATransactionLookup so the innerclass TransactionAdapter ctor does the lookup and stores the extendedJTATransaction in a static in the WebSphereExtendedJTATransactionLookup class. This solves our performance problems. Now, the WebSphereExtendedJTATransactionLookup class is not heavily documented (...) so it is not obvious to us if this breaks something else. 2. NPE in FromClause.findIntendedAliasedFromElementBasedOnCrazyJPARequirements We have 2 Named queries (defined as annotions on the relavant entity) that basically breaks the Hibernate JPA initialization, as a NullPointerException is thrown in line 120 of FromClause.findIntendedAliasedFromElementBasedOnCrazyJPARequirements(). I've taken the liberty to change the "direction" of the equals in the if-statement, assuming that the "specifiedAlias" is never null. This solves the NPE problem. Please find attached the 2 modified files and don't flame me if I'm not following procedures. Kind regards Jesper Udby Freelance I/T Consultant

17 years

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