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* BUG #17195: Can't bind $1::int param when I use COPY TO STDOUT statement - libpq, C++
@ 2021-09-19 09:17 PG Bug reporting form <noreply@postgresql.org>
2021-09-19 15:08 ` Re: BUG #17195: Can't bind $1::int param when I use COPY TO STDOUT statement - libpq, C++ Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: PG Bug reporting form @ 2021-09-19 09:17 UTC (permalink / raw)
To: pgsql-bugs@lists.postgresql.org; +Cc: stankiewiczal@gmail.com
The following bug has been logged on the website:
Bug reference: 17195
Logged by: Aleksander Stankiewicz
Email address: stankiewiczal@gmail.com
PostgreSQL version: 13.4
Operating system: Windows
Description:
I have test table like below:
--DROP TABLE test_point
CREATE TABLE test_point(
serie_id INT NOT NULL,
version_ts INT NOT NULL,
PRIMARY KEY (serie_id, version_ts)
);
I try to use parametrized query inside COPY TO statement. Te test case
showing the issue is below.
When I execute this short test I receive such message:
0x0000027645b28dc0 "ERROR: bind message supplies 1 parameters, but prepared
statement \"\" requires 0\n"
Test case:
TEST(TSStorage, CopyParamTest)
{
auto sql = "COPY(SELECT version_ts FROM test_point WHERE serie_id =
$1::int) TO STDOUT (FORMAT binary)";
auto connPtr =
PQconnectdb("postgresql://postgres:pswd@localhost/test_db");
int seriesIdParam = htonl(5); // or just put 5 directly here - doesn't
matter for the statement compilation here
const char *paramValues[] = {(const char *)&seriesIdParam};
const int paramLengths[] = {sizeof(seriesIdParam)};
const int paramFormats[] = {1}; // 1 means binary
auto result = PQexecParams(connPtr,
sql,
1, //nParams,
nullptr,
paramValues,
paramLengths,
paramFormats,
1); // Output format - binary
// Ensure it's in COPY_OUT state
if (PQresultStatus(result) != PGRES_COPY_OUT)
{
auto errorMsg = PQerrorMessage(connPtr);
int set_breakpoint_here = 0;
}
PQclear(result);
PQfinish(connPtr);
}
How to provide param for binding there?
When I use sql without COPY statement there it recognizes param without any
problems.
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: BUG #17195: Can't bind $1::int param when I use COPY TO STDOUT statement - libpq, C++
2021-09-19 09:17 BUG #17195: Can't bind $1::int param when I use COPY TO STDOUT statement - libpq, C++ PG Bug reporting form <noreply@postgresql.org>
@ 2021-09-19 15:08 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2021-09-19 15:08 UTC (permalink / raw)
To: stankiewiczal@gmail.com; +Cc: pgsql-bugs@lists.postgresql.org
PG Bug reporting form <noreply@postgresql.org> writes:
> auto sql = "COPY(SELECT version_ts FROM test_point WHERE serie_id =
> $1::int) TO STDOUT (FORMAT binary)";
Don't hold your breath for that to work :-(. Utility statements in
general do not support parameterization. COPY is not an exception,
even when it contains what looks like a full DML command. Maybe
somebody will improve that someday, but we'll certainly treat it
as a new feature not a bug fix.
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
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2021-09-19 09:17 BUG #17195: Can't bind $1::int param when I use COPY TO STDOUT statement - libpq, C++ PG Bug reporting form <noreply@postgresql.org>
2021-09-19 15:08 ` Tom Lane <tgl@sss.pgh.pa.us>
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