Thread: count(*) in binary mode returns 0
I have an implementation of binary format communication that is working quite well but it is failing inexplicably on returning valid results for the aggregate function count. It returns a correct result for instance for the aggregate function max.
Here is some debug information to illustrate that I have debugged the host order conversions and what have you in implementing this binary format. As you can see, it is simply returning 0.
s:select count(*) from "User" where ("email" = $1)
valsl 1
val_str:t@t.com len:7
result received
free_iter_pre
alloc_result pre
fname: count
nfields: 1
from_psql 00000000000000000000000000000000 bytes_to_read:4 read:4
host_order 00000000000000000000000000000000 bytes_to_read:4 read:4
conv_int ir:0
fname: count
"imagenesis@gmail.com" <imagenesis@gmail.com> writes:
> I have an implementation of binary format communication that is working
> quite well but it is failing inexplicably on returning valid results for
> the aggregate function count. It returns a correct result for instance for
> the aggregate function max.
> Here is some debug information to illustrate that I have debugged the host
> order conversions and what have you in implementing this binary format. As
> you can see, it is simply returning 0.
Offhand I'd bet that you're mistransmitting the statement parameter so
that the WHERE condition never succeeds. You could set log_statement=all
and look in the postmaster log to see what the server thinks it's getting.
regards, tom lane
imagenesis@gmail.com wrote: > nfields: 1 > from_psql 00000000000000000000000000000000 bytes_to_read:4 read:4 > host_order 00000000000000000000000000000000 bytes_to_read:4 read:4 > conv_int ir:0 Note that count(*) produces a bigint (8 bytes), not an int (4 bytes). => select pg_typeof(count(1)); pg_typeof ----------- bigint (1 row) Can you check if your code does work when the query is simply SELECT 1::bigint ? Best regards, -- Daniel Vérité PostgreSQL-powered mailer: http://www.manitou-mail.org Twitter: @DanielVerite