如何在Oracle上生成版本4(随机)的UUID?

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问题描述

此博客解释说，sys_guid()的输出并非在每个系统上都是随机的:

This blog explains, that the output of sys_guid() is not random for every system:

http://feuerthoughts.blogspot. de/2006/02/watch-out-for-sequential-oracle-guids.html

不幸的是，我必须使用这样的系统.

Unfortunately I have to use such a system.

如何确保获得随机UUID? sys_guid()是否可能?如果不是，如何在Oracle上可靠地获取随机UUID?

How to ensure to get a random UUID? Is it possible with sys_guid()? If not how to reliably get a random UUID on Oracle?

推荐答案

我现在将其用作解决方法:

I use this now as a workaround:


create or replace function random_uuid return RAW is
  v_uuid RAW(16);
begin
  v_uuid := sys.dbms_crypto.randombytes(16);
  return (utl_raw.overlay(utl_raw.bit_or(utl_raw.bit_and(utl_raw.substr(v_uuid, 7, 1), '0F'), '40'), v_uuid, 7));
end random_uuid;

该功能需要dbms_crypto和utl_raw.两者都需要执行授权.

The function requires dbms_crypto and utl_raw. Both require an execute grant.

grant execute on sys.dbms_crypto to uuid_user;

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