bulk updating a list of values from a list of ids

Question

I\'m frequently facing this issue, as an Oracle user, playing around with MySql.

Be the following situation:

• a list of ids (1, 2, 3, ..., n)
• a

Answer 1

Here is one way to do this using one query. It won't be the prettiest-formatted query, but it will be just one.

<?php

$id_list = implode(',', $ids);
$whens = implode(
    "\n    ",
    array_map(
        function ($id, $value) {
            return "WHEN {$id} THEN {$value}";
        },
        $ids,
        $values
    )
);

$sql = "
    UPDATE value
    SET value = CASE id
    {$whens}
    END
    WHERE id IN ({$id_list})
";
?>

See my modified SQLFiddle.