Generate UUID v4 automatically in MySQL

Is it possible to generate a UUID version 4 (completely random) in MySQL? I would like to use it as a primary key. Use Case --------- - Many systems will insert to the table, some may specify a UUID when inserting, but some will not. They will generate their own UUID, then insert it later (offline insert). - I already have systems that use MySQL, and I would prefer to stay with the same DBMS. - I prefer UUID v4 because of its physical machine independence. Alternatives ------------- I could simply create a trigger that calls the uuid function, as outlined in https://dba.stackexchange.com/questions/57293/mysql-alter-table-to-automatically-put-in-a-uuid , but the uuid function generates UUID v1 ids. I could always generate the UUID externally, but I would prefer a built-in default. This is easy to do in Postgres, and some other DBMSes, but is there a way to do it in MySQL?