Bulk update mysql with where statement

Question

How to update mysql data in bulk ? How to define something like this :

UPDATE `table` 
WHERE `column1` = somevalues
SET  `column2` = othervalues

Answer 1

If the "bulk" data you have is dynamic and is coming from PHP (you did tag it, after all), then the query would look something like this:

INSERT INTO `foo` (id, bar)
VALUES 
    (1, 'pineapple'),
    (2, 'asian pear'),
    (5, 'peach')
ON DUPLICATE KEY UPDATE bar = VALUES(bar);

and the PHP to generate this from an existing array (assuming the array is of a format like:

$array = (
    somevalues_key => othervalues_value
);

) would look something like this (by no means the best (doesn't address escaping or sanitizing the values, for instance), just an quick example):

$pairs = array();
foreach ($array as $key => $value) {
    $pairs[] = "($key, '$value')";
}

$query = "INSERT INTO `foo` (id, bar) VALUES " . implode(', ', $pairs) . " ON DUPLICATE KEY UPDATE bar = VALUES(bar)";