Re: Sequences

The only problem with this solution is that I have already incremented the sequence and need to use the current value?  Is there a way to assign the value to a variable and then use it in an insert statement?

This is just a hashed out example.  I am hoping it can all be done in sql statements...
Example:
        var num = select last_value from user_table_id_seq;

        insert into users ( "user_id", "user_fname", "user_lname", "user_email" )
        values ( 'num', 'Ray', 'Hunter', 'rhunter@enterasys.com' );

If I could do this is would be great...Is it possible?

Thanks,

Ray Hunter
Firmware Engineer

ENTERASYS NETWORKS

-----Original Message-----
From: Bruno Wolff III [mailto:bruno@wolff.to]
Sent: Monday, February 11, 2002 7:37 AM
To: Hunter, Ray
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] Sequences

On Mon, Feb 11, 2002 at 08:43:23AM -0500,
  "Hunter, Ray" <rhunter@enterasys.com> wrote:
> I have various sequences in my database set up for ids.  My question
> is: How can I get the current value of the sequence without creating a
> session and using the currval function?
>
> I would like to take the current value of the sequence and use it for
> a value in an insert statement.
>
>
> Example:
>
>       insert into users ( "user_id", "user_fname", "user_lname",
> "user_email" )
>       values ( 'current sequence', 'Ray', 'Hunter', 'rhunter@enterasys.com'
> );

I think you want to use nextval in this context. currval is used when you have already gotten a new sequence number and want to use it in several inserts in the same transaction.

If you make user_id a serial type, then its default value will be nextval and you could use: insert into users ( "user_fname", "user_lname", "user_email" )

  values ('Ray', 'Hunter', 'rhunter@enterasys.com' );
to add a row.

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