Posts tagged orm
Using JPA to persist the Tour de France Java Object Graph to relational database tables
1In a recent article – http://technology.amis.nl/blog/12786/building-java-object-graph-with-tour-de-france-results-using-screen-scraping-java-util-parser-and-assorted-facilities – I described how I retrieved the statistics for recent Tour de France editions from the official Tour de France website from my Java program and constructed an Java Object Graph for the data on stages, riders and rankings. In this article, I will show how I have persisted that data, from the Java Objects to Relational Tables in my local Oracle XE database. Note: the fact that this concerns Tour de France data is not really relevant for this story – it is a generic story about how JPA is used to map and persist Java Classes and Objects to a relational database.
The Class diagram for the classes involved looks like this:
The Java program discussed in the previous article retrieves data from the Le Tour De France website and creates an Object Graph according to these object definitions. Note: in comparison with the previous article, I have already applied a few small changes that will help with othe ORM mapping that JPA will do for me. The stage and rider references in Standing as well as the tour references More >
Masterclass for Java Developers – Make that Database Work for You! 17th December 2010
3Really getting the most out of your database. That would be nice, given wat databases can do (and what you may have paid for them).
Few serious Java Applications are completely devoid of interaction of some kind with a database.
However, most ORM and  Java Persistency frameworks do their utmost to hide the database and all it can do from the Java application and very few Java developers can truly leverage the full capabilities of the database their application works with. For all intents and purposes, the database in many cases is still nothing more than a flat storage cabinet.
On 17th December I will present a Masterclass that demonstrates how Java applications can benefit from the functionality on offer from underlying databases in a way that does not impact the application architecture, introduces breaches of open standards or creates undesirable coupling. Using plain JDBC, JPA frameworks and alternative interaction channels – for example http-based RESTful interaction – this seminar demonstrates through many examples how [Java] applications can become better performing, more elegantly designed and more productively developed as well as more scalable and robust.
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