EHCache - how does it work?

Kornel · **Joined:** Mon Feb 04, 2008 6:31 am **Posts:** 8

Hi,
I've got a question about ehcache - when I'm doing a query (like "from MyObject") how is the cache working? Is all the data fetched from the DB and then compared to the objects in cache (and then we've got a hit or miss) or are only the id's retrieved and then compared to the cached objects?
I've started wondering after changing manually in my db a record, and the data was retrieved correctly - how did Hibernate/EHCache noticed the change?
It's configured as a second level cache.

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Regards,
Kornel

kochcp · **Posted:** Fri May 30, 2008 12:03 pm

the cache is cleared when a table update is called by your application. Problem is when you have mutliple applications or threads updating the same table.

Kornel · **Joined:** Mon Feb 04, 2008 6:31 am **Posts:** 8

kochcp wrote:

the cache is cleared when a table update is called by your application. Problem is when you have mutliple applications or threads updating the same table.

Fair enough, but I've changed the db manually (using a command line sql update statement). Coincidence (the object expired?) the listAll method returned the changed object not the old one?