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vipg
2025-10-09 18:19:57 +08:00
commit b44e40f25d
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-- 切换到目标数据库
\c postgres;
-- 检查并创建UUID扩展如果不存在
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
-- 定义检测UUID v7支持的函数
CREATE OR REPLACE FUNCTION check_uuid_v7_support() RETURNS BOOLEAN AS $$
DECLARE
test_uuid UUID;
BEGIN
BEGIN
SELECT gen_random_uuid_v7() INTO test_uuid;
RETURN TRUE;
EXCEPTION
WHEN undefined_function THEN
RETURN FALSE;
END;
END;
$$ LANGUAGE plpgsql VOLATILE;
-- 创建UUID v7兼容函数修复UUID格式长度问题
CREATE OR REPLACE FUNCTION gen_random_uuid_v7() RETURNS uuid AS $$
DECLARE
unix_ts_ms BIGINT;
rand_a BIGINT;
rand_b BIGINT;
hex_str TEXT;
BEGIN
-- 获取当前毫秒级Unix时间戳
unix_ts_ms := (EXTRACT(EPOCH FROM NOW()) * 1000)::BIGINT;
-- 生成随机数(调整随机数范围以确保总长度正确)
rand_a := (random() * (2^20 - 1))::BIGINT;
rand_b := (random() * (2^44 - 1))::BIGINT; -- 从48位调整为44位减少2个字节
-- 组合UUID v7格式确保总长度为32个十六进制字符
hex_str :=
lpad(to_hex(unix_ts_ms >> 12), 8, '0') ||
lpad(to_hex((unix_ts_ms & 4095) << 4), 4, '0') ||
'7' || lpad(to_hex(rand_a >> 18), 3, '0') ||
lpad(to_hex(8 + (rand_a & 16383) >> 12), 2, '0') ||
lpad(to_hex(rand_a & 4095), 3, '0') ||
lpad(to_hex(rand_b), 11, '0'); -- 从12位调整为11位
RETURN hex_str::uuid;
END;
$$ LANGUAGE plpgsql VOLATILE;