Insert into a MySQL table or update if exists

Question

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:

Answer 1

INSERT IGNORE INTO table (id, name, age) VALUES (1, "A", 19);

INSERT INTO TABLE (id, name, age) VALUES(1, "A", 19) ON DUPLICATE KEY UPDATE NAME = "A", AGE = 19;

REPLACE INTO table (id, name, age) VALUES(1, "A", 19);

All these solution will work regarding your question.

If you want to know in details regarding these statement visit this link

Answer 2

In case that you wanted to make a non-primary fields as criteria/condition for ON DUPLICATE, you can make a UNIQUE INDEX key on that table to trigger the DUPLICATE.

ALTER TABLE `table` ADD UNIQUE `unique_index`(`name`);

And in case you want to combine two fields to make it unique on the table, you can achieve this by adding more on the last parameter.

ALTER TABLE `table` ADD UNIQUE `unique_index`(`name`, `age`);

Note, just make sure to delete first all the data that has the same name and age value across the other rows.

DELETE table FROM table AS a, table AS b WHERE a.id < b.id 
AND a.name <=> b.name AND a.age <=> b.age;

After that, it should trigger the ON DUPLICATE event.

INSERT INTO table (id, name, age) VALUES(1, "A", 19) ON DUPLICATE KEY UPDATE    
name = VALUES(name), age = VALUES(age)

Answer 3

Use INSERT ... ON DUPLICATE KEY UPDATE

QUERY:

INSERT INTO table (id, name, age) VALUES(1, "A", 19) ON DUPLICATE KEY UPDATE    
name="A", age=19

Answer 4

Try this out:

INSERT INTO table (id, name, age) VALUES (1, 'A', 19) ON DUPLICATE KEY UPDATE id = id + 1;

Hope this helps.

Answer 5

Check out REPLACE

http://dev.mysql.com/doc/refman/5.0/en/replace.html

REPLACE into table (id, name, age) values(1, "A", 19)

Answer 6

When using batch insert use the following syntax:

INSERT INTO TABLE (id, name, age) VALUES (1, "A", 19), (2, "B", 17), (3, "C", 22)
ON DUPLICATE KEY UPDATE
    name = VALUES (name),
    ...