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create or replace function pgq.seq_getval(i_seq_name text)
returns bigint as $$
-- ----------------------------------------------------------------------
-- Function: pgq.seq_getval(1)
--
-- Read current last_val from seq, without affecting it.
--
-- Parameters:
-- i_seq_name - Name of the sequence
--
-- Returns:
-- last value.
-- ----------------------------------------------------------------------
declare
res int8;
fqname text;
pos integer;
s text;
n text;
begin
pos := position('.' in i_seq_name);
if pos > 0 then
s := substring(i_seq_name for pos - 1);
n := substring(i_seq_name from pos + 1);
else
s := 'public';
n := i_seq_name;
end if;
fqname := quote_ident(s) || '.' || quote_ident(n);
execute 'select last_value from ' || fqname into res;
return res;
end;
$$ language plpgsql strict;
create or replace function pgq.seq_setval(i_seq_name text, i_new_value int8)
returns bigint as $$
-- ----------------------------------------------------------------------
-- Function: pgq.seq_setval(2)
--
-- Like setval() but does not allow going back.
--
-- Parameters:
-- i_seq_name - Name of the sequence
-- i_new_value - new value
--
-- Returns:
-- current last value.
-- ----------------------------------------------------------------------
declare
res int8;
fqname text;
begin
fqname := pgq.quote_fqname(i_seq_name);
res := pgq.seq_getval(i_seq_name);
if res < i_new_value then
perform setval(fqname, i_new_value);
return i_new_value;
end if;
return res;
end;
$$ language plpgsql strict;
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