Get last serial (autoincrement) value

Hi,

Anyone knows how to obtain last inserted serial (autoincrement) id? I
am currently using "SELECT id FROM table_name ORDER BY id DESC", and
then retrieve first row and desired value.

May be there is more elegant way? I am using ADODB. ADODB has function
which in theory allows to obtain
last inserted serial (autoincrement) id, but for Postgres it return OID.

This is from ADODB manual:

Insert_ID( )
Returns the last autonumbering ID inserted. Returns false if function
not supported.
Only supported by databases that support auto-increment or object id's,
such as PostgreSQL, MySQL and MSSQL currently. PostgreSQL returns the
OID, which can change on a database reload.

Thanks in advance for any suggestion.

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