undesirable caching

Someone will yell at me, the answer is in the manual from somewhere, but I have not found.

I do a query and get a pair of objects:

EntityManager em = this.emf.createEntityManager ();
Query q = em.createQuery ("select s, BlackBox bb bb join bb.software s where bb.idString = '" + id + "'");
List < Object [] > rssoftware = q.getResultList ();
Object [] aResult = rssoftware.get (0);
Software = (Software)(aResult[0]);
BlackBox bb = (BlackBox)(aResult[1]);

The objects seem to be what I asked.

However, when the data for these objects are changed in the database, and I call the method containing extract of code above again, I get objects with old data in them.
The objects are new, they have different Ideas of the 'old'. But they have the old data in them.

What I am doing wrong? Why the query does not pick up the new data to the database?

Hello

It's in the docs, but as one of the fundamental reasons for the use of TopLink/EclipseLink or most other JPA providers, it might not be clear in its section of the advantages and disadvantages. The draw back is as you experience; changes outside of the Joint Parliamentary Assembly will not get picked up, unless you explicietly update objects. JPA provides the EntityManager updated api to do this, but there are many other options you can use in TopLink or EclipseLink to minimize this problem. Queries can be set to refresh by using query flags, caches for some objects can be invalidated, or even set to be a customer puts in cache instead of shared etc. caches. Options can be tailored to your needs of use and performance.
While this is discussed more in depth in the docs but spread over different sections such as caching, queries and sections of the performance, I find christophe blog a good starting point:
http://weblogs.Java.net/blog/guruwons/archive/2006/09/understanding_t_1.html

For your simple example, I would just like to add query.setHint ("eclipselink.refresh", true); line to your code before executing the query (or "toplink.refresh" If you use TopLink and TopLink Essentials instead of EclipseLink).

I hope this helps.

Chris

Tags: Fusion Middleware

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