Thread: [NOVICE] LibPQ, C, BLOB or BYTEA
Hi All!
Is there a way to pass BYTEA values w/o formating to escape/hex binary ASCII strings from C to plpqsql stored function ?
--
С уважением,
Ruslan R. Laishev
Ruslan R. Laishev
OpenVMS bigot, natural born system/network progger, C contractor.
+79013163222
+79910009922
On Mon, Oct 23, 2017 at 7:00 AM, Ruslan R. Laishev <zator@yandex.ru> wrote: > Hi All! > > Is there a way to pass BYTEA values w/o formating to escape/hex binary ASCII > strings from C to plpqsql stored function ? From a C client application? Yes, you need to use the binary wire format. merlin -- Sent via pgsql-novice mailing list (pgsql-novice@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-novice
Merlin Moncure <mmoncure@gmail.com> writes:
> On Mon, Oct 23, 2017 at 7:00 AM, Ruslan R. Laishev <zator@yandex.ru> wrote:
>> Is there a way to pass BYTEA values w/o formating to escape/hex binary ASCII
>> strings from C to plpqsql stored function ?
> From a C client application? Yes, you need to use the binary wire format.
Yeah, specifically see PQexecParams() or one of its sibling functions.
You need to execute some command like "SELECT myfunc($1::bytea)" and
then pass the parameter value in binary format.
regards, tom lane
--
Sent via pgsql-novice mailing list (pgsql-novice@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-novice
The question was "How To?". :-)
I looking for something like follows:
...
char __data_bytea[128];
RAND_bytes(__data_bytea, sizeof(__data_byte));
...
argv[0] = __data_bytea;
argl[0] = sizeof(__data_bytea);
...
PQexecPrepared ( ... argv, argl , ...);
PS:I know way conversion binary data to "binary data ASCII string" by PQescapeByteaConn(), but it's way to for real jedi.
23.10.2017, 16:20, "Merlin Moncure" <mmoncure@gmail.com>:
On Mon, Oct 23, 2017 at 7:00 AM, Ruslan R. Laishev <zator@yandex.ru> wrote:
Hi All!
Is there a way to pass BYTEA values w/o formating to escape/hex binary ASCII
strings from C to plpqsql stored function ?
From a C client application? Yes, you need to use the binary wire format.
merlin
--
С уважением,
Ruslan R. Laishev
Ruslan R. Laishev
OpenVMS bigot, natural born system/network progger, C contractor.
+79013163222
+79910009922
On Mon, Oct 23, 2017 at 9:18 AM, Ruslan R. Laishev <zator@yandex.ru> wrote: > The question was "How To?". :-) > I looking for something like follows: > ... > char __data_bytea[128]; > > > RAND_bytes(__data_bytea, sizeof(__data_byte)); > ... > argv[0] = __data_bytea; > argl[0] = sizeof(__data_bytea); > > ... > PQexecPrepared ( ... argv, argl , ...); check out libpqtypes -- it does exactly what you want. merlin -- Sent via pgsql-novice mailing list (pgsql-novice@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-novice
Thanks, will look later ...
At the time I looking for a way to solve the problem w/o introducing a yet another API.
24.10.2017, 00:08, "Merlin Moncure" <mmoncure@gmail.com>:
On Mon, Oct 23, 2017 at 9:18 AM, Ruslan R. Laishev <zator@yandex.ru> wrote:
The question was "How To?". :-)
I looking for something like follows:
...
char __data_bytea[128];
RAND_bytes(__data_bytea, sizeof(__data_byte));
...
argv[0] = __data_bytea;
argl[0] = sizeof(__data_bytea);
...
PQexecPrepared ( ... argv, argl , ...);
check out libpqtypes -- it does exactly what you want.
merlin
--
С уважением,
Ruslan R. Laishev
Ruslan R. Laishev
OpenVMS bigot, natural born system/network progger, C contractor.
+79013163222
+79910009922