//
CREATE TABLE counters(
id INT NOT NULL UNIQUE, -- multiple counters can be stored in this table, this is its id
value INT -- current value of the counter
);
-- Initialize the first counter with start value 10
INSERT INTO counters VALUES (1, 10);
-- Let's get the current value
SELECT value FROM counters WHERE id = 1;
-- Increment the counter
UPDATE counters SET value = value + 1 WHERE id = 1;
//
START TRANSACTION;
-- Let's get the current value
SELECT value FROM counters WHERE id = 1 FOR UPDATE;
-- Increment the counter
UPDATE counters SET value = value + 1 WHERE id = 1;
COMMIT;
//
UPDATE counters
SET value = (@cur_value := value) + 1
WHERE id = 1;
//
UPDATE counters
SET value = LAST_INSERT_ID(value) + 1
WHERE id = 1;
