Can Hibernate 2LC do caching for not found records in database? I'm googling and searching Hibernate forums too but usually standard 2LC topics are coming up.

I query Account entity by primary key accountNumber - it is configured as @Cachable.
If I execute em.find('AA') first time then hibernate will check 2LC, it is missed in 2LC then SQL query will be executed. There is no account AA in DB so em.find call return null.

If I execute em.find('AA') second time in another transaction then hibernate will execute SQL query again even SQL was executed before.

Is it possible that Hibernate will save null from first executed query so another SQL is not required until AA key will be invalidated in cache?

I use EAP 6.2.4, Hibernate 4.2.7, Infinispan 5.2.7

Thanks

First of all, why would you go to the cache with an identifier value that doesn't exist?

Anyway, you can still get what you are asking for. All you need to do is to switch to a cacheable query:



You need to enable query caching too:



This way, the query result will be cached in the database and the second transaction will load the result from the query cache and there is no database roundtrip.

Thanks. I was thinking about using query cache here.

This is for purpose for specific/default logic with relation using two fields as primary key like Number/Category. If there is entity with Number1/Category1 then use it otherwise try to use Number1/Default. With query cache I can check all entities with Number1 without looking at category - it will work with SQL approach but I preferred using 2LC with primary key to keep my application less depended on SQL and more closer to querying by primary key. I don't have too much SQL logic and want to test it soon against 1LC without DB by changing DAOs.

Hibernate also support searching by natural-id, so, if you can represent that querying criteria as a @NaturalId, then you can use the natural-id second level cache support.