Defined by specification as a Version 1 UUID. Commonly used, but avoid if you are sensitive about disclosing the MAC of your database server or the time when this value was generated. The uuid-ossp plugin can generate various versions of UUID.Ĭontains MAC address of current computer + current moment. Uuid_ uuid NOT NULL DEFAULT uuid_generate_v1(), - <= See that command used in the following example table definition. That method call can be made automatically to generate a default value for any newly inserted row. Some people may not want to record the server’s actual MAC address, for example, for security or privacy concerns. Later variations on this theme were developed for alternate kinds of UUIDs. To get the original version of UUID built from the computer’s MAC address plus current date-time plus a small random value, call uuid_generate_v1(). See the extension’s doc to see a list of multiple commands offered for generating various kinds of UUID values. CREATE EXTENSION IF NOT EXISTS "uuid-ossp" A build of this library for Postgres is often bundled with an installation of Postgres such as the graphical installers provided by Enterprise DB or included by cloud providers such as Amazon RDS for PostgreSQL. The extension we want is an open-source library built in C for working with UUIDs, OSSP uuid. See my blog post for more details, or see this page in StackOverflow. To avoid re-installing, add IF NOT EXISTS. To install an extension, call CREATE EXTENSION. In Postgres, a plug-in is known as an extension. While Postgres out-of-the-box supports storing UUID (Universally Unique Identifier) values in their native 128-bit form, generating UUID values requires a plug-in. If you already use the pgcrypto extension, consider the Answer by bpieck. Pkey UUID NOT NULL DEFAULT uuid_generate_v1() , The Postgres server will automatically invoke the function every time a row is inserted. Call DEFAULT when defining a column to invoke one of the OSSP uuid functions.
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