On 2012-10-09 13:11, Bob MacCallum wrote:
> Hi all,
>
> I'm trying to get a Reporter query from the BASE2.x API which is
> basically "ORDER BY RAND(123)" - to get reproducible "random" order (I
> can explain *why* in another email if anyone cares to know).
>
> I tried this
>
> DataQuery<net.sf.basedb.core.data.ReporterData> repQuery =
> net.sf.basedb.core.Reporter.getQuery();
>
> repQuery.order(Orders.asc(new HqlExpression("RAND(123)", "xxx")));
>
> But it seems that HqlExpression isn't for public use. I can't find
> something like "Expressions.hql".
This can be found in net.sf.basedb.core.query.Hql.expression(...)
> Could somebody please save me a ton of time and tell me how to put
> some arbitrary SQL into the ORDER BY clause of a DataQuery?
Note that it is not SQL that is needed but HQL (Hibernate Query
Language). Don't know if RAND() is available in HQL. If not, it should
be possible to create a custom Hibernate dialect and use that in the
'db.dialect' setting in base.config. I have never done that so I don't
know any details or how hard/easy it is.
Another possibility is to use Reporter.getDynamicQuery() instead which
lets you work with SQL, but code-wise it's a bit harder to work with
since you have to process the result row-by-row and column-by-column
instead of as ReporterData objects.
/Nicklas
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