How do I get the NextVal from an oracle Sequence thru NHibernate

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I am working on c# .net 4.0 and using NHibernate to talk with an Oracle DB. You would think something as simple as this is already addressed somewhere but sadly its not. I need the NextVal from an Oracle sequence. I do not need to insert it a database as part of an Id or Primary key. I just need to use the next val on the c# side.

Can somebody help me out with xml mapping and C# file(or a link) to achieve this.

Thanks.

Something like

int NextValueOfSequence = GetNextValueofSequence(); <br />
<br />
 public int GetNextValueOfSequence() { <br />
 // Access NHibernate to return the next value of the sequence.<br />
  }

Posted 7-Jan-11 8:44am

trainer42in

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2 solutions

Solution 1

Here's the skinny on using an Oracle sequence. There are two functions available for an Oracle sequence. One is NEXTVAL and the other is CURRVAL. NEXTVAL will trigger the sequence and return that value to you. CURRVAL get's you the last one returned. Therefore it is important to not call CURRVAL until NEXTVAL has been called at least once.

select sequence.NEXTVAL from dual;
  or
select sequence.CURRVAL from dual;

Sorry though, I can't help you with the NHiberbate stuff. :)

Posted 7-Jan-11 9:11am

Chris Meech

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Kythen · Accepted Answer · 2011-01-07T09:35:00

Solution 2

Try something like this:

<your session variable>.CreateSQLQuery("select <your sequence>.NEXTVAL from dual").UniqueResult<Int64>();

I don't have an Oracle db handy to test it out, but this should at least get you on the right track.

Posted 7-Jan-11 9:35am

Kythen

Updated 7-Jan-11 9:36am

v2

Comments

trainer42in 7-Jan-11 17:07pm

Thanks, That helped.