Hi, I use Hibernate with JBoss Cache. I have entities like below, All i want is to retrieve Last 20 messages posted by User's Friends.
| UserEntity (Long id) | FriendEntity (Long id, User user, Friend friend) | MessageEntity(Long id, User owner, String message, Timestamp created); | Because of performance issues, i use NativeQuery with UNION, not IN. For a User who have 1000 friends, i generate a query like: | (select * from messages where owner = 1 order by created DESC LIMIT 20) | UNION ALL | (select * from messages where owner = 2 order by created DESC LIMIT 20) | UNION ALL | (select * from messages where owner = 3 order by created DESC LIMIT 20) | ... | 997 more | ... | ORDER BY CREATED DESC LIMIT 20 It gives me the result i want but it is the worst way i have ever used. How can i use cache in order to improve the performance of such a Query? Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4207959#4207959 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4207959 _______________________________________________ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
