Philipinho
54 lines
2.2 KiB
TypeScript
54 lines
2.2 KiB
TypeScript
import { Kysely, sql } from 'kysely';
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export async function up(db: Kysely<any>): Promise<void> {
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await sql`
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/*
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* MIT License - Copyright (c) 2023-2024 Fabio Lima
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* Source: https://gist.githubusercontent.com/fabiolimace/515a0440e3e40efeb234e12644a6a346/
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*/
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CREATE OR REPLACE FUNCTION gen_uuid_v7() RETURNS uuid AS $$
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declare
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v_time numeric := null;
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v_unix_t numeric := null;
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v_rand_a numeric := null;
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v_rand_b numeric := null;
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v_unix_t_hex varchar := null;
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v_rand_a_hex varchar := null;
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v_rand_b_hex varchar := null;
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v_output_bytes bytea := null;
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c_milli_factor numeric := 10^3::numeric; -- 1000
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c_micro_factor numeric := 10^6::numeric; -- 1000000
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c_scale_factor numeric := 4.096::numeric; -- 4.0 * (1024 / 1000)
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c_version bit(64) := x'0000000000007000'; -- RFC-4122 version: b'0111...'
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c_variant bit(64) := x'8000000000000000'; -- RFC-4122 variant: b'10xx...'
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begin
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v_time := extract(epoch from clock_timestamp());
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v_unix_t := trunc(v_time * c_milli_factor);
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v_rand_a := ((v_time * c_micro_factor) - (v_unix_t * c_milli_factor)) * c_scale_factor;
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v_rand_b := random()::numeric * 2^62::numeric;
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v_unix_t_hex := lpad(to_hex(v_unix_t::bigint), 12, '0');
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v_rand_a_hex := lpad(to_hex((v_rand_a::bigint::bit(64) | c_version)::bigint), 4, '0');
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v_rand_b_hex := lpad(to_hex((v_rand_b::bigint::bit(64) | c_variant)::bigint), 16, '0');
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v_output_bytes := decode(v_unix_t_hex || v_rand_a_hex || v_rand_b_hex, 'hex');
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return encode(v_output_bytes, 'hex')::uuid;
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v_output_bytes := decode(v_unix_t_hex || v_rand_a_hex || v_rand_b_hex, 'hex');
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return encode(v_output_bytes, 'hex')::uuid;
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end $$ LANGUAGE plpgsql;`.execute(db);
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}
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export async function down(db: Kysely<any>): Promise<void> {
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await sql`DROP FUNCTION gen_uuid_v7`.execute(db);
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}
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