11/7/2023 0 Comments Mariadb generate uuidWe’ve prepared three ways you can try this feature out. How to try the 10.7 UUID data type preview yourself? $ mariadb -column-type-info -execute "SELECT UUID()" The metadata of the datatype is also a string of type uuid. Similarly, you can expect warnings if you haven’t got the right format: SELECT CAST('longlive-that-bear-a456-426655440000' AS UUID) Like all data types, you can have default values: CREATE TABLE t1 (Ĭ1 UUID DEFAULT 0x00000000000000000000000000000000,Ĭ2 UUID DEFAULT 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF,Ĭ3 UUID DEFAULT '00000000-0000-0000-0000-000000000000',Ĭ4 UUID DEFAULT 'ffffffff-ffff-ffff-ffff-ffffffffffff',Ĭ5 UUID DEFAULT CAST(X'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' AS UUID) This also works with replication the primary/replica can be of these different types and it converts. With these basic conversion rules, you can migrate from your existing CHAR/VARCHAR/TEXT hexadecimal text or BINARY/VARBINARY/BLOB encoded to UUID using: CREATE TABLE t1 (id BINARY(16)) If you have BINARY(16) data strings those can be cast to the UUID too: SELECT CAST(x'102030405000000000000000adcefeff' AS UUID) So for the most part it looks like a string. What does the UUID data type look like? CREATE TABLE t1 (id UUID) Like the INET6 data type, this uses the datatype plugin API from MariaDB 10.5. A 128-bit value with a text representational value and the prescription of a number of version types to ensure a uniqueness makes it an ideal data type.Īfter many years of the UUID datatype existing only as a feature request in MDEV-4958, slowly accumulating votes and watchers, we are pleased to announce a preview of the UUID data type. Universally unique identifiers (UUIDs) have a common place in computing already.
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