Insert into a MySQL table or update if exists

Solution for :Insert into a MySQL table or update if exists

If I want to add a row to a database table, but if a row exists with the same unique key I want to update the row.

For example:

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1	insert into table (id, name, age) values(1, "A", 20)

Let’s say the unique key is id, and in my database there is a row with id = 1. In that case I want to update that row with these values. Normally this gives an error. If I use insert IGNORE it will ignore the error, but it still won’t update.

We can use INSERT ... ON DUPLICATE KEY UPDATE

QUERY:

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1 2	INSERT INTO table (id, name, age) VALUES(1, "A", 20) ON DUPLICATE KEY UPDATE    name="A", age=20