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Re: SPI_getvalue fails

From: <vivek(at)staff(dot)ownmail(dot)com>
To: pgsql-interfaces(at)postgresql(dot)org
Subject: Re: SPI_getvalue fails
Date: 2006-07-31 13:27:35
Message-ID: 200607311327.k6VDRZhM004975@mail009.ownmail.com (view raw or flat)
Thread:
Lists: pgsql-interfaces
Thanks friends, solved it.
 added a FOR EACH ROW and it worked.
Thanks for all your support




With warm regards.

Vivek J. Joshi.

vivek(at)staff(dot)ownmail(dot)com
Trikon electronics Pvt. Ltd.

All science is either physics or stamp collecting.
                -- Ernest Rutherford



vivek(at)staff(dot)ownmail(dot)com wrote:
> >Here is the code:-
>
>#include <stdio.h>
>#include "postgres.h"
>#include "executor/spi.h"
>#include "commands/trigger.h"
>#include <math.h>
>#include <sys/time.h>
>#include <time.h>
>#include <sys/types.h>
>#include <sys/wait.h>
>#include <unistd.h>
>#include <errno.h>
>#include <stddef.h>
>#include <dirent.h>
> 
>#include <fcntl.h>
>#include <stdlib.h>
>#include <string.h>
> 
>extern Datum trigast(PG_FUNCTION_ARGS);
>extern char **environ;
> 
>int do_log(char *log)
>{
>  FILE *fp=fopen("/home/vivek/logs/trig.log","a");
>  if (fp)
>  {
>    time_t t = time(NULL);
>    struct tm *c_date = localtime(&t);
>    char *t_now=strdup(asctime(c_date));
>    t_now[strlen(t_now)-1]=0;
>    fprintf(fp,"%s-trigfaxes-%s\n",t_now,log);
>    fclose(fp);
>    return 1;
>  }
>  return -1;
>}
> 
> 
>PG_FUNCTION_INFO_V1(trigast);
>Datum
>trigast(PG_FUNCTION_ARGS)
>{
>	do_log("STARTING TRIGGER");
>	HeapTuple   rettuple;
>	HeapTuple   trigtuple;
>	TupleDesc   tupdesc;
>	int ret, i;
>	bool isnull;
>	char *disposition; //13
>	char *when;
>	char logs[1024];
> 
>	do_log(" Checking fcinfo");
>	if (CALLED_AS_TRIGGER(fcinfo)) {
>		TriggerData *trigdata = (TriggerData *) fcinfo->context;
>		SPI_connect();
> 
>		do_log("GOT TRIGTUPLE");
> 
>		rettuple = trigdata->tg_trigtuple;
> 
>		char *relation=SPI_getrelname(trigdata->tg_relation);
>		sprintf(logs,"Relation is %s", relation);
>		do_log(logs);
> 
>		trigtuple = trigdata->tg_trigtuple;
>		tupdesc = trigdata->tg_relation->rd_att;
> 
>		if( tupdesc == NULL || trigtuple == NULL ){
>                do_log("tupdesc OR trigtuple == NULL" );
>                if( tupdesc == NULL )
>                        do_log("tupdesc is NULL" );
>                if( trigtuple == NULL )
>                        do_log( "trigtuple is NULL" );
>        	}
>        	else
>                	do_log("tupdesc && trigtuple ARE NOT NULL" );
> 
> 
>		do_log("Starting to get values");
> 
>		disposition=SPI_getvalue(trigtuple, tupdesc,13);
>		sprintf(logs, "value is %s", disposition);
>		do_log(logs);  // doesnot reach here.
> 
>    	}
>	SPI_finish();
>    	return PointerGetDatum(rettuple);
> 
>}
> 
>/*
>logs are:-
>Mon Jul 31 18:20:12 2006-trigfaxes-STARTING TRIGGER
>Mon Jul 31 18:20:12 2006-trigfaxes- Checking fcinfo
>Mon Jul 31 18:20:12 2006-trigfaxes-GOT TRIGTUPLE
>Mon Jul 31 18:20:12 2006-trigfaxes-Relation is ast_cdr
>Mon Jul 31 18:20:12 2006-trigfaxes-tupdesc OR trigtuple == NULL
>Mon Jul 31 18:20:12 2006-trigfaxes-trigtuple is NULL
>Mon Jul 31 18:20:12 2006-trigfaxes-Starting to get values
>*/
> 
>/*
>gdb shows:-
>Program received signal SIGSEGV, Segmentation fault.
>0x08121f46 in SPI_getvalue ()
>(gdb) bt
>#0  0x08121f46 in SPI_getvalue ()
>*/
>
>
>
>
>With warm regards.
>
>Vivek J. Joshi.
>
>vivek(at)staff(dot)ownmail(dot)com
>Trikon electronics Pvt. Ltd.
>
>All science is either physics or stamp collecting.
>                -- Ernest Rutherford
>
>
>
>Michael Fuhr wrote:
>> >On Mon, Jul 31, 2006 at 12:29:25PM +0530, vivek(at)staff(dot)ownmail(dot)com wrote:
>>> I get a coredump if I try to use SPI_getvalue. Upon writing some
>>> logs, I see that postgresql gets the insert  statement properly
>>> with all the values non null but the variable trigdata->tg_trigtuple 
>>> is NULL. I am not able to figure out why it happens so. 
>>
>>The connection between trigdata->tg_trigtuple being NULL and
>>SPI_getvalue() causing a core dump isn't clear from what you've
>>written.  It sounds like you're writing a C function that's called
>>via a trigger -- is that correct?  Could you post the CREATE TRIGGER
>>statement and the function's code?
>>
>>-- 
>>Michael Fuhr
>>
>>---------------------------(end of broadcast)---------------------------
>>TIP 6: explain analyze is your friend
>
>
>
>---------------------------(end of broadcast)---------------------------
>TIP 2: Don't 'kill -9' the postmaster



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Subject: Re: SPI_getvalue fails
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Subject: Re: SPI_getvalue fails

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