Insert data to mysql database if not exist

Question

I'm using java and I want to insert to mysql database a data if not exist, Also I want to update that data if exist. but I couldn't find mysql command for this.

I found this code for Insert but this is not what I want

INSERT INTO contacts
(contact_id, contact_name)
SELECT supplier_id, supplier_name
FROM suppliers
WHERE EXISTS (SELECT *
              FROM orders
              WHERE suppliers.supplier_id = orders.supplier_id);

For update, I found this code. but this is not what I want.

UPDATE suppliers
SET supplier_name = (SELECT customers.customer_name
                     FROM customers
                     WHERE customers.customer_id = suppliers.supplier_id)
WHERE EXISTS (SELECT *
              FROM customers
              WHERE customers.customer_id = suppliers.supplier_id);

What I want to do is something like this

UPDATE student SET student_score = 20 where student_id = 1 WHERE EXIST ( select * from student where student_id = 1;

Answer 1

You can use: insert into table_name (id, name, firstname) values(1, "Sessi", "Brahim") on duplicate key update name=values(name), firstname=values(firstname)

Adapt it to your query.