A question from comp.lang.php:
I have a MySQL table of pages each with a ‘title’ and ‘page’ fields.
How do I do either an UPDATE if the pages ‘title’ exists or an INSERT if it does not?
Assuming that `title` is a primary or unique key, it’s very simple:
INSERT INTO `pages` (`title`, `page`) VALUES ('My Title', 'My Page') ON DUPLICATE KEY UPDATE `page`='My Page'
See MySQL documentation for more information:
Alternatively, you can issue a REPLACE query:
The difference is that with INSERT … ON DUPLICATE KEY UPDATE, you can update an existing record partially (i.e., if there are fields other than `title` and `page`, they will be kept intact). REPLACE, however, deletes an existing row (if it exists, that is) before writing a new one, so any fields not explicitly set by the REPLACE query will be set to their default values.