random « Query « JPA Q&A

1. Hibernate running random queries stackoverflow.com

All, when I first call buildSessionFactory, Hibernate seems to be running a bunch of queries on my DB. They vary from being "selects" to "insert"s. Why is this and how can ...

2. Random select rows via JPA stackoverflow.com

In Mysql,

SELECT id FROM table ORDER BY RANDOM() LIMIT 5

this sql can select 5 random rows. How to do this via JPA Query (Hibernate as provider, Mysql database)? Thanks.

3. Order By Rand by Time (HQL) stackoverflow.com

I'm developing a web application using asp.net Mvc 2 and NHibernate, and I'm paging data (products in a category) in my page, but this data are random, so, I'm using a ...

4. Java Query and Enum stackoverflow.com

I have a problem this getting result list from query. Query return me an null Object. I dont have any idea why its happen. But if I comment its WHERE ...

5. Random Select Query on Hibernate 2.1.6 forum.hibernate.org

Is there a way to do a random select query on Hibernate 2.1.6? Usually I do this random select query on MySQL by using this SQL: select * from answer order by rand() limit 1; I'm looking for a way on how to do this in Hibernate. Can I use the rand() function in HQL? Or is there a specific util ...

6. Hibernate RANDOMLY gives back old or new results on select forum.hibernate.org

This is what i did: session.Update(Object) alright, now i do 1000 identical selects sometimes it gives me back the new updated result, but SOMETIMES it gives me back the old ones! What is going on there...how come hibernate givbes me randomely back the old or the new results???? Other funny thing, if i do 3 changes, it gives me back randomely ...

7. Random inserts/deletes on a select forum.hibernate.org

Author Message spoons10 Post subject: Random inserts/deletes on a select Posted: Fri Sep 15, 2006 10:53 am Beginner Joined: Tue Apr 19, 2005 9:39 am Posts: 45 I have 3 tables {Group, FeatureAccess, Feature}. The Group table and the Feature table have a many-to-many relationship, and per Database Design, I created an associative table that makes the relationships one-to-manies. ...

8. Random inserts/deletes on a select forum.hibernate.org

Author Message spoons10 Post subject: Random inserts/deletes on a select Posted: Fri Sep 15, 2006 11:36 am Beginner Joined: Tue Apr 19, 2005 9:39 am Posts: 45 I have 3 tables {Group, FeatureAccess, Feature}. The Group table and the Feature table have a many-to-many relationship, and per Database Design, I created an associative table that makes the relationships one-to-manies. ...

9. Random select with Criteria forum.hibernate.org

One option is to do the following: Criteria.setFirstResult(randomNumber) ; criteria.setMaxResults(4*n); // select randomingly n entries out of the 4*n returned You can combine this with for ( nbLoops ) { Criteria.setFirstResult(randomNumber) ; criteria.setMaxResults(10); // select randomingly from the 10 } A third mechanism is to have some field that is random. Every time you write a record you write something random ...

10. Random error encountered when executing select statement forum.hibernate.org

Hi, I encountered the following error randomly while trying to retrieve records from my postgres: org.hibernate.exception.GenericJDBCException: could not execute query at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) at org.hibernate.loader.Loader.doList(Loader.java:2148) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029) at org.hibernate.loader.Loader.list(Loader.java:2024) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375) at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:308) at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:153) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1106) at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79) at com.eam.statistics.manager.TemplateManager.retrieveLocList(TemplateManager.java:308) at com.eam.statistics.tester.web.viewSearchCrit.getRequiredItems(viewSearchCrit.java:49) at com.eam.statistics.tester.web.viewSearchCrit.execute(viewSearchCrit.java:57) at sun.reflect.GeneratedMethodAccessor197.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:365) at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:217) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:191) ...