Bug #706 mysql_fetch_row doesn't reset errorcode
Submitted: 24 Jun 2003 3:09 Modified: 27 Aug 2003 0:39
Reporter: Georg Richter Email Updates:
Status: Not a Bug Impact on me:
Category:MySQL Server Severity:S3 (Non-critical)
Version:all OS:Any (all)
Assigned to: Jani Tolonen CPU Architecture:Any

[24 Jun 2003 3:09] Georg Richter
I'm not sure if it's a bug or a documentation problem. Some calls like mysql_fetch_row don't set mysql->net.lasterror to 0

How to repeat:
// Valid call
mysql_query(mysql, "SELECT a FROM test");
res = mysql_store_result(mysql);

// invalid call
mysql_query(mysql, "THIS DOESN'T WORK!");
printf ("%d\n", mysql_errno(mysql));

row = mysql_fetch_row(res);
printf ("%d\n", mysql_errno(mysql));

[27 Aug 2003 0:39] Michael Widenius
This is not a bug.  The intention is that mysql_error() and mysql_errno() are only well defined if you get an error for the previous statement. (A bit like 'errno' in C).

I have updated the documentation with this and added a note that some functions does reset mysql_error() if they succeed. The most important ones regarding this is mysql_store_result() and mysql_use_result().