Modelling Oracle Sequences

Hi,

I am in the process of porting a number of large MSSQL databases to
Postgres.

The current id generation model in SQL server is an oracle style sequence
generator i wrote using a pretty simple stored proc and table structure.

I now need to do the same thnig in postgres.

In MSSQL I was able to open an UPDATE cursor, which places a lock on the row
in the sequence table. I then update, release and return.

Has anyone done something similar or have any pointers on how to do this
safely, securely without an update cursor?

Any infor appreciated.

Cheers,

Julian.

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