inert into & update 一次操作多条记录

INERT INTO

SQL:

INSERT INTO `userTable` (`user_id`, `user_name`) VALUES
(1, 'dsf'),
(2, 'fgy'),
(3, 'faad');

PHP:

$a = 1;
while (5 == $a)
{
    if (1 == $a)
        $sql = "INSERT INTO tbl_name (col1,col2) VALUES ($a,$b)";
    else
        $sql .= ",($a,$b)";

    $a++;
    $b++;
}
mysql_query($sql);

UPDATE

UPDATE categories
    SET display_order = CASE id
        WHEN 1 THEN 3
        WHEN 2 THEN 4
        WHEN 3 THEN 5
    END,
    title = CASE id
        WHEN 1 THEN 'New Title 1'
        WHEN 2 THEN 'New Title 2'
        WHEN 3 THEN 'New Title 3'
    END
WHERE id IN (1,2,3)