About setMaxResults
Setting and Tuning of JPA Queries
Explains various JPA query settings - result range, flush and lock.... topics: Result Range (setFirstResult, setMaxResults) Flush Mode (setFlushMode) Lock Mode ... Hints Result Range (setFirstResult, setMaxResults) The setFirstResult ... See JavaDoc Reference Page... and setMaxResults setMaxResults(maxResult) TypedQuery's method Set ...
setMaxResults(maxResult)
Set the maximum number of results to retrieve.(Method of javax.persistence.TypedQuery)
setMaxResults(maxResult)
Set the maximum number of results to retrieve.(Method of javax.persistence.Query)
LIMIT or TOP functions
Is there LIMIT or TOP functions in object db? If so can you provide some examples? ... retrieve. See JavaDoc Reference Page... and setMaxResults setMaxResults(maxResult) TypedQuery's method Set the maximum number ...
javax.persistence.TypedQuery
Interface used to control the execution of typed queries.(Interface of JPA)
Listing large number of complicated objects with paging.
Hi, For last few hours I was working on a problem with bad performance and memory problems with such a simple query: select prod from Product prod order by prod.id ASC Right now I have 55541 'Product' (attached to this post) entities in database and I'm trying to speed listing them with paging. The problem is, that running code that looks like this: ... = icQuery. setFirstResult ( start ) . setMaxResults ( count ) . getResultList ( ) ; ... are you trying to retrieve in every query execution ( setMaxResults ). Does that number affect? You may try running the ...
NPE at com.objectdb.jpa.JpaQuery.getResultList
This is very similar to issue #51 raised by kaosko . So perhaps I should have added it there. Anyway, here it is.... ... ! all ) { q. setMaxResults ( maxResults ) ; q. ... ! all ) { q. setMaxResults ( maxResults ) ; q. ...
Caching/Paging Questions...
Greetings ObjectDB team, All below questions assume a very large database (~1,000,000,000 objects): Q1: Two queries with a big overlap between their result sets. If I query the first set and hold the results in memory somehow, would that speed up the execution of the second query since many of its result objects already created and reside in memory ?... maximum size of the L2 cache. Using setFirstResult and setMaxResults could improve performance, but the effect is highly dependent on ...
Sorting problem
Hi, I was rewriting our DAO to support pagging in large dataset and I think I have found a problem with sorting. I send you a test case - sorry for using the same project as previous, but it was faster to write this test case. As usual, you can load data with DataLoader and then check problem with QueryData. There is a simple query with "order by" sentence: #1 2011-02-13 00:04 Hi, I was rewriting our DAO to support pagging in large dataset and I think I have found a problem with s ...
