How setCacheable of Query will work

[Ravi Kiran Va]

I have created a query for select Operation in Hibernate using

Query query =session.createQuery("select from Book book where book.bookname =?");                           
query.setParameter(0,"Hibernate",Hibernate.STRING);
query.setCacheable(true);

I think that If i specify setCacheable true of Query then this will not hit the database and return data from Cache ?


Please tell me if my understanding is right or wrong on this ??

Thanks in advance

[Paul Sturrock]

The query cache does not cache the entire object, as the first and second level cached do, it caches the query plus the returned identifiers. Remember not all queries willl return whole populated objects after all. Hibernate will uses these identifiers to access data possibly cached in the second level cache. If its not cached there it will hit the database.

[Ravi Kiran Va]

Thank you , it was a valuable information .

" Hibernate will sues these identifies to access data possibly cached in the second level cache. "

Can you please tell what the above statement actualy means ?

Thanks in advance.

[Paul Sturrock]

Sorry, sloppy typing. See above.

[Ravi Kiran Va]

Thank You very much paul

I have cleared my query with Query Cache .

I have an another query also what if i use cache at Object level . Does this also require second level cache?

<class name="eg.Cat" .... >
    <cache usage="read-write"/>
    ....
    <set name="kittens" ... >
        <cache usage="read-write"/> 
        ....
    </set>
</class>