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Add some modicum of error detection...

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This commit is contained in:
Tom Lane
2000-10-24 00:08:02 +00:00
parent 570ed46401
commit d7186cfa9b
1 changed files with 22 additions and 12 deletions
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34
src/test/examples/testlo.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/test/examples/testlo.c,v 1.15 2000/04/25 16:39:07 momjian Exp $ * $Header: /cvsroot/pgsql/src/test/examples/testlo.c,v 1.16 2000/10/24 00:08:02 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -96,6 +96,8 @@ pickout(PGconn *conn, Oid lobjId, int start, int len)
buf[nbytes] = '\0'; buf[nbytes] = '\0';
fprintf(stderr, ">>> %s", buf); fprintf(stderr, ">>> %s", buf);
nread += nbytes; nread += nbytes;
if (nbytes <= 0)
break; /* no more data? */
} }
fprintf(stderr, "\n"); fprintf(stderr, "\n");
lo_close(conn, lobj_fd); lo_close(conn, lobj_fd);
@ -126,6 +128,11 @@ overwrite(PGconn *conn, Oid lobjId, int start, int len)
{ {
nbytes = lo_write(conn, lobj_fd, buf + nwritten, len - nwritten); nbytes = lo_write(conn, lobj_fd, buf + nwritten, len - nwritten);
nwritten += nbytes; nwritten += nbytes;
if (nbytes <= 0)
{
fprintf(stderr, "\nWRITE FAILED!\n");
break;
}
} }
fprintf(stderr, "\n"); fprintf(stderr, "\n");
lo_close(conn, lobj_fd); lo_close(conn, lobj_fd);
@ -229,21 +236,24 @@ main(int argc, char **argv)
/* lobjOid = importFile(conn, in_filename); */ /* lobjOid = importFile(conn, in_filename); */
lobjOid = lo_import(conn, in_filename); lobjOid = lo_import(conn, in_filename);
if (lobjOid == 0) if (lobjOid == 0)
{
fprintf(stderr, "%s\n", PQerrorMessage(conn)); fprintf(stderr, "%s\n", PQerrorMessage(conn));
}
else
{
printf("\tas large object %u.\n", lobjOid);
printf("\tas large object %u.\n", lobjOid); printf("picking out bytes 1000-2000 of the large object\n");
pickout(conn, lobjOid, 1000, 1000);
printf("picking out bytes 1000-2000 of the large object\n"); printf("overwriting bytes 1000-2000 of the large object with X's\n");
pickout(conn, lobjOid, 1000, 1000); overwrite(conn, lobjOid, 1000, 1000);
printf("overwriting bytes 1000-2000 of the large object with X's\n"); printf("exporting large object to file \"%s\" ...\n", out_filename);
overwrite(conn, lobjOid, 1000, 1000); /* exportFile(conn, lobjOid, out_filename); */
if (!lo_export(conn, lobjOid, out_filename))
fprintf(stderr, "%s\n", PQerrorMessage(conn));
printf("exporting large object to file \"%s\" ...\n", out_filename); }
/* exportFile(conn, lobjOid, out_filename); */
if (!lo_export(conn, lobjOid, out_filename))
fprintf(stderr, "%s\n", PQerrorMessage(conn));
res = PQexec(conn, "end"); res = PQexec(conn, "end");
PQclear(res); PQclear(res);