mysqlAtomic select and update (e.g. fetch unique rows on each request)

START TRANSACTION;
SELECT id FROM tbl WHERE processed = 0 LIMIT 1 FOR UPDATE;
UPDATE tbl SET processed = 1 WHERE id = 2;
COMMIT;ctrl + cyoutubegithub

`START TRANSACTION` starts transaction	`tbl` table to select rows from
`processed = 0` condition to select rows from table	`LIMIT 1` select only one row
`FOR UPDATE` lock selected rows till they are updated by us	`SET processed = 1` updated selected row (after possible processing)
`id = 2` condition to update selected row (use fetched ID of a row)	`COMMIT` finish transaction (lock will be released after that)