Hi Nicklas,
Thanks very much for the quick reply. I am *so* close to getting this
working - it seems that the argument-less rand() is available in HQL
but I will have to jump through a few hoops to provide the seeded
version.
I'll post an update later...
cheers,
Bob.
On Tue, Oct 9, 2012 at 12:50 PM, Nicklas Nordborg <nick...@thep.lu.se> wrote:
> 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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