Pete Freitag Pete Freitag

Creating a ColdFusion UUID in MySQL

Published on August 16, 2022
By Pete Freitag

The uuid() function in MySQL returns a 36 character hex string, formatted as:


ColdFusion's createUUID() function returns a 35 character hex string formatted as:


Both store the same amount of data (16 bytes), the only difference is that there is an extra dash in the MySQL uuid() function result.

Here's some SQL I came up with to create a UUID using ColdFusion's formatting in raw SQL:

SELECT upper(concat(left(uuid(), 23), right(uuid(), 12)))

It is not an ideal solution because I am actually calling uuid() twice, but it is sufficient for my use case. You could probably use a regex to remove the extra dash and avoid calling uuid twice if you wanted to try and optimize it. Feel free to post a comment if you can come up with a better way to do it.

Now suppose you want to convert the CFML uuid back to a MySQL uuid, you can do so like this:

SELECT lower(concat(left(some_id, 23), '-', right(some_id, 12))) FROM table

mysql uuid createuuid

Creating a ColdFusion UUID in MySQL was first published on August 16, 2022.

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Oh groovy. I was just starting to learn about the possibility of using a UUID as the primary key on a table. I wasn't sure if the UUID algorithm used in MySQL and ColdFusion were equivalent; but it sounds like I can probably just insert the missing dash to get the two platforms on the same page. Still feels crazy to use anything but an AUTO_INCREMENT primary key :D But, I need to break out of my comfort zone.
by Ben Nadel on 09/30/2022 at 9:52:44 AM UTC
Shouldn't it be the app that conforms to the database? Lucee and both have CreateGUID() which includes the missing dash.
by Lionel Holt on 11/28/2023 at 5:32:52 AM UTC

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