Re: Sequence CURRVAL & NEXTVAL

On Wed, 11 Aug 2004 18:01:39 -0400, "CV" <cv_at_nospamadelphia.net> wrote:

>We have a procedure that tries to insert records into a table and uses the
>ID generated by a sequence as the primary key. Some inserts result in
>exceptions due to a Unique_key constraint. This is a desired behaviour for
>some exception handling that we do.
>However, using the inserts as described above results in "wasting" many of
>the IDs from the sequence because the numbers generating an exception are
>not inserted. The inserts use sequence.NEXTVAL before doing an insert.
>To maintain continuity in the ID values, I have tried using temporary
>variables to hold the value of sequence.CURRVAL & increment the sequence
>value only if the insert succeeds. However, this approach doesn't work for
>the very first insertion & I get the following error:
>ORA-08002: sequence TEST_SEQ.CURRVAL is not yet defined in this session
>
>Is there a way of using CURRVAL & NEXTVAL in an if-loop, so that their
>values are incremented only if a certain condition is met?
>
>

There isn't. You also have to use nextval before you can use currval at all. And wasting sequencenumbers is not a problem, or you shouldn't be using sequences.

--
Sybrand Bakker, Senior Oracle DBA