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From: James Woods 61-89-895256 <jaws@pangaea.dme.nt.gov.au>
To: postgres@postgres.berkeley.edu
Subject: large objects
Date: Mon, 15 Mar 93 20:46:28 -0800
Message-ID: <9303160446.AA08940@postgres.Berkeley.EDU> (raw)

I am just starting to delve into storing large objects using the inversion 
method and have run into a few problems.  The first was with the setenv() call
which I have written my own routine to do what I think it does, could you 
please tell me if it is correct.

int setenv(char *var, char *val, int unknown_param)
{
  char *envstr;
 
  if(!var || !val) {
    fputs("NULL string calling setenv", stderr);
    return;
  }
  if(unknown_param != 1) {
    fprintf(stderr, 
            "unrecognised third parameter %d to setenv,"
            " assuming it is unimportant",
            unknown_param);
  }
 
  if(!(envstr = (char*)malloc(strlen(var)+strlen(val)+2))) {
    fputs("out of memory error\n", stderr);
    exit(1);
  }
 
  strcpy(envstr, var);
  strcat(envstr, "=");
  strcat(envstr, val);
 
  return putenv(envstr);
}

The second one is that I cannot seem to create more than one lage object in a database.  I am attempting to store SUN rasterfiles and when I store the first 
image it appears to work ok giving the following messages on the screen:

sock = 4
Pfout = d714 Pfin = d728

When I then attempt to store a second image in the same database with a 
different name to the first it gives the following message and then just 
freezes:

sock = 4
Pfout = d714 Pfin = d728
Error: WARN:Mar 15 14:59:59:amcreate: Xinv0 relation already exists

I am using the following code, which i basically copied out of the reference 
manual, to store the images. 

void store(unsigned char *image, char *filename)
{
  int fd;
  char *qry_result;
  char dbname[1024];
  struct rasterfile *header = (struct rasterfile*)image;
  int bufsize = 
    sizeof(struct rasterfile) + header->ras_maplength + header->ras_length;
 
  PQsetdb("jawsraster");
 
  if(*(qry_result = PQexec("begin")) == 'R') {
    fputs("error on PQexec\n", stderr);
    exit(-1);
  }
 
  strcpy(dbname, "jaws/raster/");
  if(*filename == '/')
    strcat(dbname, filename+1);
  else
    strcat(dbname, filename);
 
  if((fd = p_creat(dbname, INV_WRITE, Inversion)) < 0) {
    fprintf(stderr, "error creating database file %s\n", dbname);
    exit(-1);
  }
 
  if(p_write(fd, image, bufsize) < bufsize) {
    fputs("error writing image to database\n", stderr);
    exit(-1);
  }
 
  p_close(fd);
 
  if(*(qry_result = PQexec("end")) == 'R') {
    fputs("error commiting transaction\n", stderr);
    exit(-1);
  }
}

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  To: postgres@postgres.berkeley.edu
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  Subject: Re: large objects
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