I must say, I really wish I knew about this technique years ago – before I started using frameworks to do a lot of my development. The effort that was wasted in building separate code and separate logic to deal with inserts vs updates, when all of this time, there is a nice and simple feature built-in to Mysql that does this for us…
Mysql: Insert or Update in One SQL Statement 
The process is quite straight forward, when I run a standard INSERT statement with Mysql, I can provide additional properties for dealing with DUPLICATE KEY, e.g. the record already exists.
Here is an example:
INSERT INTO `table` (`name`, `created`, `modified`)
VALUES ('Jamie', NOW(), NOW())
ON DUPLICATE KEY
UPDATE `name` = 'Jamie', `modified` = NOW()
Notice how in the UPDATE statement I'm only updating the name and modified date.
Another nice example can be used for keeping track of the number of times a tag is used. Imagine you have a table with a list of tags and their associated count. You can leverage the above functionality to increase the count each time the tag is used again:
INSERT INTO `tags` (`tag`, `count`, `created`, `modified`)
VALUES ('mysql', 1, NOW(), NOW())
ON DUPLICATE KEY
UPDATE `count` = `count` + 1, `modified` = NOW()
That's it! No more need to right functionality like:
if ($id == 0) {
// do insert
} else {
// do update
}
For my information, visit Mysql Documentation.
Published on Oct 3, 2012
Tags: SQL Tutorials for Beginners, Intermediate and Advanced Users | insert | update | duplicate
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Jamie Munro is the author of ASP.NET MVC 5 with Bootstrap and Knockout.js, Knockout.js: Building Dynamic Client-Side Web Applications, 20 Recipes for Programming MVC 3, and 20 Recipes for Programming PhoneGap. He has been developing websites and web applications for over 20 years.
Jamie began his writing career in 2009. As the success of Jamie's blog grew, he turned his writing passion to books about web development in hopes that his many years of experience could be passed on to his readers.
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