Question

I have a table with a unique constraint on two columns. I’m trying to user on duplicate key update but am getting an error…

… create the table

CREATE TABLE IF NOT EXISTS `requests` (
  `userFrom` int(11) NOT NULL,
  `userTo` int(11) NOT NULL,
  `dateSent` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY `userFrom` (`userFrom`,`userTo`)
)

… add some data

INSERT INTO requests (userFrom, userTo) VALUES (1, 2)

… then this fails (when passed userFrom of 1 and userTo of 2

INSERT INTO requests (userFrom, userTo) VALUES (:userFrom, :userTo) ON DUPLICATE KEY UPDATE set dateSent = NOW()

Error is:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set dateSent = NOW()' at line 1

Answer 1

i think there is no needed for set keyword here, try this

INSERT INTO requests (userFrom, userTo) VALUES (:userFrom, :userTo) ON DUPLICATE KEY UPDATE dateSent = NOW()