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=head2 $db->commit;

=head2 ag_db_write($db)

Writes changes made to the current record to the database.

=head2 $db->release;

=head2 ag_db_release($db);

Unlocks I<current record> if it is locked; I<current record> becomes
undefined.

=head2 $db->seek(key => "key", create => 1, size => $size);

=head2 ag_db_newrec($db, "key", $size);

Finds and locks existing records or creates new one. Size can be set to
the total record size in bytes if you know it, otherwise do not supply
it at all.

=head2 $db->drop;

=head2 ag_db_delrec

Deletes I<current record> which must be locked.

=head2 $db->next(lock => 1);

=head2 ag_readnext($db);

Moves I<current record> to the next record in the database in random
order locking it if required. Returns key text or undef if no more
records exist.

=head1 FIELD LEVEL METHODS