Is there an easy way to INSERT
a row when it does not exist, or to UPDATE
if it exists, using one MySQL query?
Use INSERT ... ON DUPLICATE KEY UPDATE
. For example:
INSERT INTO `usage`
(`thing_id`, `times_used`, `first_time_used`)
VALUES
(4815162342, 1, NOW())
ON DUPLICATE KEY UPDATE
`times_used` = `times_used` + 1