Question

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();

public int GetNextValueOfSequence()
{

// Access NHibernate to return the next value of the sequence.

}

Answer 1

Mapping:

  <sql-query name="GetSequence" read-only="true">
    <return-scalar type="Int64"/>
    <![CDATA[
    SELECT SeqName.NEXTVAL from DUAL;
    ]]>
  </sql-query>

Code:

Int64 nextValue = session.GetNamedQuery("GetSequence").UniqueResult<System.Int64>();