mysql - Update nothing on duplicate key exist

Question

I'm using the query INSERT INTO ... ON DUPLICATE KEY UPDATE ... in order to insert a record into the table, and if a row with duplicate keys already exists, this results in triggering an update.

I don't want any updates being performed on an existing row, if exist.

What should I do to update nothing when a row with duplicate keys exist?

Answer 1

只需使用原始值设置唯一值，（假设ProductID是唯一的）例如，

INSERT INTO CART (ProductID, Quantity)
VALUES (1, 100)
ON DUPLICATE KEY UPDATE ProductID = ProductID;