row(s) affected in mysql update with PHP

Question

How do i find if my update is successful or not? i update using a where uniqueName=name so i should always only update 0 rows or 1. What is a good way to check if i updated

Answer 1

I'm pretty late here, but you could always force a failure on no match by changing your query.

For table 'foo' with columns 'ID' and 'value'. Match expression: ID = 4

update foo
join (select ID as nearID,
ID = 4
as matched from foo order by matched desc limit 0, 1) as t on nearID = ID
set value='somedata2'    
, ID = if(matched, nearID, 'nomatch')

It's probably easier just to change the table to include either an update timestamp or sequence number instead though. (since those would change on every update)

Answer 2

If using PDO, affected rows can be obtained using rowCount() function as below:

/* Delete all rows from the FRUIT table */
$del = $dbh->prepare('DELETE FROM fruit');
$del->execute();

/* Return number of rows that were deleted */
print("Return number of rows that were deleted:\n");
$count = $del->rowCount();
print("Deleted $count rows.\n");

Answer 3

mysql_affected_rows() will return the number of rows affected by your update.

http://us.php.net/manual/en/function.mysql-affected-rows.php

Answer 4

if your update query is in a variable named $query, you can do;

$result = mysql_query($query);
if($result){
    //succes!
} else {
    //fail!
}

Hope this helps. If you just want to know if your query was executed succesfully, this will do. If you really want to know how many rows are affected, use the other suggestions.

Answer 5

mysql_affected_rows($link) is correct but depreciated.. mysqli_affected_rows($link) should be used now.

http://php.net/manual/en/function.mysql-affected-rows.php

Answer 6

try using mysql_affected_rows([$link])