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create extension if not exists pgcrypto; | |
create or replace function uuid_generate_v7() | |
returns uuid | |
as $$ | |
declare | |
output bytea; | |
unixts bytea = e'\\000\\000\\000\\000\\000\\000\\000\\000\\000'; | |
timestamp timestamptz; | |
unix_time bigint; | |
microseconds int; | |
begin | |
timestamp = clock_timestamp(); | |
unix_time = floor(extract(epoch from timestamp))::bigint; | |
microseconds = (cast(extract(microseconds from timestamp)::int - (floor(extract(seconds from timestamp))::int * 1000000) as double precision) * 16.777216)::int; | |
unixts = set_byte(unixts, 0, (unix_time >> 28)::bit(8)::int); | |
unixts = set_byte(unixts, 1, (unix_time >> 20)::bit(8)::int); | |
unixts = set_byte(unixts, 2, (unix_time >> 12)::bit(8)::int); | |
unixts = set_byte(unixts, 3, (unix_time >> 4)::bit(8)::int); | |
unixts = set_byte(unixts, 4, ((unix_time::bit(4))||((microseconds >> 20)::bit(4)))::bit(8)::int); | |
unixts = set_byte(unixts, 5, (microseconds >> 12)::bit(8)::int); | |
unixts = set_byte(unixts, 6, (b'0111'||(microseconds >> 8)::bit(4))::bit(8)::int); | |
unixts = set_byte(unixts, 7, microseconds::bit(8)::int); | |
unixts = set_byte(unixts, 8, (b'10'||get_byte(gen_random_bytes(1), 0)::bit(6))::bit(8)::int); | |
output = unixts || gen_random_bytes(7); | |
return substring(output::text from 3)::uuid; | |
end | |
$$ | |
language plpgsql | |
volatile; |
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