Openjpa Database Support

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4. Database Support - Apache OpenJPA

    https://openjpa.apache.org/builds/1.2.3/apache-openjpa/docs/ref_guide_dbsetup_dbsupport.html
    OpenJPA can take advantage of any JDBC 2.x compliant driver, making almost any major database a candidate for use. See our officially supported database list in Appendix 2, Supported Databases for more information. Typically, OpenJPA auto-configures its JDBC behavior and SQL dialect for your database, based on the values of your connection-related configuration properties.

4. Database Support - Apache OpenJPA

    http://openjpa.apache.org/builds/1.0.0/apache-openjpa-1.0.0/docs/manual/ref_guide_dbsetup_dbsupport.html
    OpenJPA can take advantage of any JDBC 2.x compliant driver, making almost any major database a candidate for use. See our officially supported database list in Appendix 2, Supported Databases for more information. Typically, OpenJPA auto-configures its JDBC behavior and SQL dialect for your database, based on the values of your connection-related configuration properties.

2. OpenJPA JPA Tutorial - Apache Software Foundation

    https://people.apache.org/~mprudhom/openjpa/site/openjpa-project/manual/jpa_tutorial.html
    Hypersonic SQL, a pure Java relational database, is included in the OpenJPA distribution. We have included this database because it is simple to set up and has a small memory footprint; however, you can use this tutorial with any of the relational databases that we support.

Troubleshooting JPA applications

    https://www.ibm.com/support/knowledgecenter/en/SSEQTP_9.0.5/com.ibm.websphere.base.doc/ae/tejb_jpatroubleshoot.html
    This update manager can rearrange the order of SQL requests to the database. This alleviates an application from knowing the order of entity manager operations required to perform its business logic and optimizes database performance using underlying batching support.

GitHub - Tirasa/OpenJPA-Azure: Windows Azure SQL Database ...

    https://github.com/Tirasa/OpenJPA-Azure
    Windows Azure SQL Database sharding support for OpenJPA - Tirasa/OpenJPA-Azure

ObjectDB Support

    https://www.objectdb.com/database/support
    Documentation on this website explains how to use JPA in the context of the ObjectDB Object Database but mostly relevant also for ORM JPA implementations, such as Hibernate (and HQL), EclipseLink, TopLink, OpenJPA and DataNucleus. ObjectDB is not an ORM JPA implementation but an Object Database (ODBMS) for Java with built in JPA 2 support.

IBM PM74270: OPENJPA=ALL TRACING CAUSES OpenJPA class ...

    http://www-01.ibm.com/support/docview.wss?uid=swg1PM74270
    IBM Support. PM74270: OPENJPA=ALL TRACING CAUSES OpenJPA class transform/enhancement to fail. Fixes are available. 8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6 7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29 8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7 ...

IBM PI11628: OPTIMISTICLOCKEXCEPTION MAY OCCUR WHEN …

    https://www.ibm.com/support/docview.wss?uid=swg1PI11628
    If the value in the database has been rounded up, it will be different than the un-rounded value stored in-memory. As such, OpenJPA will throw an OptimisticLockException as it will assume the row in the database has been updated. As previously stated, there are two places where a Timestamp version field may be rounded: either by OpenJPA, or the ...

[OPENJPA-464] Performance improvement with Statement ...

    https://issues.apache.org/jira/browse/OPENJPA-464
    The current OpenJPA implementation did not provide the SQL statement batching. All SQL statements will be executed one statement at a time to the database. Consequently, the runtime performance was decreased due to lots of database flows.

Chapter 4. JDBC - home.apache.org

    https://people.apache.org/~mprudhom/openjpa/site/openjpa-project/manual/ref_guide_dbsetup.html
    OpenJPA JPA uses a relational database for object persistence. It communicates with the database using the Java DataBase Connectivity (JDBC) APIs. This chapter describes how to configure OpenJPA to work with the JDBC driver for your database, and how to access JDBC functionality at runtime.



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