ID: 20290
Updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
-Status: Open
+Status: Bogus
Bug Type: MySQL related
Operating System: RedHat 7.3
PHP Version: 4.2.3
New Comment:
Please check possible errors first (mysql_errno), and don't use
deprecated functions (mysql_db_query).
If the problem still exists, set the status of this bug report back to
open.
Previous Comments:
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[2002-11-06 12:20:30] [EMAIL PROTECTED]
I have a simple section of code that attempts to UPDATE a row in a
MySQL table. If mysql_affected_rows() = 0 I assume the row didn't
exist so I go ahead and INSERT it. This works about 95% of the time.
The other 5% of the time, the row does exist and IS updated, but
mysql_affected_rows() returns 0--so I go ahead and INSERT it. I then
end up with a duplicate entry. I could define the appropriate columns
as "unique" so that the INSERT would fail, but I feel that something
else is wrong here and doing this would be a work-around for what might
be a real problem.
My table is entirely numeric, no strings. It's not a case of updating
a row to its same values and so it's not counted as an affected row.
The value DOES change.
My code is:
$SQL = "UPDATE UserStats SET MS=MS+$Var,MC=MC+1
WHERE idUser=$idUser AND Month=$Month";
$updateStats = mysql_db_query ($sDB, $SQL, $nConnection);
if(mysql_affected_rows($nConnection) == 0)
{
$SQL = "INSERT INTO UserStats SET idUser=$idUser,
Month=$Month, MS=$Var,MC=1";
$updateStats = mysql_db_query ($sDB, $SQL, $nConnection);
}
MS, MC, and idUser are all BigInts. Month is MediumInt. The $Var
variable is always non-zero. I've dumped the SQL queries to a
logfile--they are always valid queries, so it's not an issue of one of
my variables not being defined and producing an improper SQL. I've
also tried the mysql_affected_rows without the $nConnection paramter.
In summary, the above UPDATE *ALWAYS* works in that the actual row in
question is always updated correctly in the MySQL database. However,
sometimes the mysql_affected_rows() returns 0 instead of 1; so my code
continues to INSERT a new row and I end up with a duplicate.
MySQL version is 3.23.49. Same UPDATE instruction works fine when
executed manually multiple times in MySQL command-line, etc. Always
returns the correct number of rows having been updated.
I am not sure if this is a PHP problem or a MySQL problem, but I lean
towards PHP since MySQL *IS* updating the row as requested and I can't
duplicate the problem outside of PHP. I'm also open to it being a code
problem on my end, but at this point I don't see how.
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Edit this bug report at http://bugs.php.net/?id=20290&edit=1
