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* Crash when using PQgetvalue
@ 2018-06-04 15:26 PG Doc comments form <noreply@postgresql.org>
2018-06-04 23:57 ` Re: Crash when using PQgetvalue Craig Ringer <craig@2ndquadrant.com>
0 siblings, 1 reply; 3+ messages in thread
From: PG Doc comments form @ 2018-06-04 15:26 UTC (permalink / raw)
To: pgsql-docs@lists.postgresql.org; +Cc: duncan.reitboeck@gmail.com
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/9.5/static/libpq.html
Description:
Hello,
I am not sure if I am doing something wrong or there is a bug in the code
but I am getting a strange issue. When I try to run the following code I get
a crash when attempting to accessing the values using PQgetvalue.
I was able to print off all the column names using PQfname. If I replace
PQgetvalue with PQgetlength the correct rows, fields and lengths are
printed. Checking PQgetisnull displayed the value as not null. I also did a
few checks using PQstatus and PQresultStatus to make sure the connection or
result set didn't mess up somehow in the middle of the code.
PGconn *con;
PGresult *pg_result;
int i = 0;
int j = 0;
int cols = 0;
int rows = 0;
con = PQconnectdb("host=localhost user=postgres password=test
dbname=test");
if(PQstatus(con) != CONNECTION_OK)
{
printf("Could not connect to PostgreSQL database!");
fflush(stdout);
}
else
{
g_print("Connected.\n");
pg_result = PQexec(con, "SELECT * FROM test");
if(PQresultStatus(pg_result) == PGRES_TUPLES_OK)
{
rows = PQntuples(pg_result);
cols = PQnfields(pg_result);
for(i = 0; i < rows; ++i)
{
for(j = 0; j < cols; ++j)
{
printf("Row: %d - Col: %d = %s\n", i, j, PQgetvalue(pg_result, i,
j)); //This is where the crash occurs. Also happens if not attempting to
print and simply getting the value or calling the function.
fflush(stdout);
}
}
}
PQclear(pg_result);
PQfinish(con);
con = NULL;
}
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Crash when using PQgetvalue
2018-06-04 15:26 Crash when using PQgetvalue PG Doc comments form <noreply@postgresql.org>
@ 2018-06-04 23:57 ` Craig Ringer <craig@2ndquadrant.com>
2018-06-05 00:22 ` Re: Crash when using PQgetvalue Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 3+ messages in thread
From: Craig Ringer @ 2018-06-04 23:57 UTC (permalink / raw)
To: duncan.reitboeck@gmail.com; pgsql-docs@lists.postgresql.org
On 4 June 2018 at 23:26, PG Doc comments form <noreply@postgresql.org>
wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/9.5/static/libpq.html
> Description:
>
> Hello,
>
> I am not sure if I am doing something wrong or there is a bug in the code
> but I am getting a strange issue. When I try to run the following code I
> get
> a crash when attempting to accessing the values using PQgetvalue.
This isn't really a comment on the documentation. Please ask for help on
the pgsql-general mailing list, Stack Overflow, or suitable forums.
You should provide a backtrace of the crash from a debugger when you do so.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Crash when using PQgetvalue
2018-06-04 15:26 Crash when using PQgetvalue PG Doc comments form <noreply@postgresql.org>
2018-06-04 23:57 ` Re: Crash when using PQgetvalue Craig Ringer <craig@2ndquadrant.com>
@ 2018-06-05 00:22 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 3+ messages in thread
From: Tom Lane @ 2018-06-05 00:22 UTC (permalink / raw)
To: Craig Ringer <craig@2ndquadrant.com>; +Cc: duncan.reitboeck@gmail.com; pgsql-docs@lists.postgresql.org
Craig Ringer <craig@2ndquadrant.com> writes:
> On 4 June 2018 at 23:26, PG Doc comments form <noreply@postgresql.org>
>> I am not sure if I am doing something wrong or there is a bug in the code
>> but I am getting a strange issue. When I try to run the following code I
>> get a crash when attempting to accessing the values using PQgetvalue.
> This isn't really a comment on the documentation.
Indeed. The submitter did file a bug a bit later, and we dealt with it
over there.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
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2018-06-04 15:26 Crash when using PQgetvalue PG Doc comments form <noreply@postgresql.org>
2018-06-04 23:57 ` Craig Ringer <craig@2ndquadrant.com>
2018-06-05 00:22 ` Tom Lane <tgl@sss.pgh.pa.us>
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