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与另一个uuid源(javascript)结合使用时的NewId与NewSequentialId_Javascript_Sql Server_Guid_Uuid - Fatal编程技术网

与另一个uuid源(javascript)结合使用时的NewId与NewSequentialId

与另一个uuid源(javascript)结合使用时的NewId与NewSequentialId,javascript,sql-server,guid,uuid,Javascript,Sql Server,Guid,Uuid,我需要在服务器端代码和客户端代码(在浏览器中)上创建UID。我目前使用NewID()作为默认值,但在客户端(在浏览器中)创建对象时,我使用uuid.js。我是否更有可能将NewSequentialId()作为默认值(在服务器端创建对象时将使用该值)发生冲突 仅供参考,这里是uuid.js代码,因为我记不起是在哪里下载的 // uuid.js // // Copyright (c) 2010-2012 Robert Kieffer // MIT License - http

我需要在服务器端代码和客户端代码(在浏览器中)上创建UID。我目前使用NewID()作为默认值,但在客户端(在浏览器中)创建对象时,我使用uuid.js。我是否更有可能将NewSequentialId()作为默认值(在服务器端创建对象时将使用该值)发生冲突

仅供参考,这里是uuid.js代码,因为我记不起是在哪里下载的

//     uuid.js
//
//     Copyright (c) 2010-2012 Robert Kieffer
//     MIT License - http://opensource.org/licenses/mit-license.php

(function() {
  var _global = this;

  // Unique ID creation requires a high quality random # generator.  We feature
  // detect to determine the best RNG source, normalizing to a function that
  // returns 128-bits of randomness, since that's what's usually required
  var _rng;

  // Node.js crypto-based RNG - http://nodejs.org/docs/v0.6.2/api/crypto.html
  //
  // Moderately fast, high quality
  if (typeof(require) == 'function') {
    try {
      var _rb = require('crypto').randomBytes;
      _rng = _rb && function() {return _rb(16);};
    } catch(e) {}
  }

  if (!_rng && _global.crypto && crypto.getRandomValues) {
    // WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
    //
    // Moderately fast, high quality
    var _rnds8 = new Uint8Array(16);
    _rng = function whatwgRNG() {
      crypto.getRandomValues(_rnds8);
      return _rnds8;
    };
  }

  if (!_rng) {
    // Math.random()-based (RNG)
    //
    // If all else fails, use Math.random().  It's fast, but is of unspecified
    // quality.
    var  _rnds = new Array(16);
    _rng = function() {
      for (var i = 0, r; i < 16; i++) {
        if ((i & 0x03) === 0) r = Math.random() * 0x100000000;
        _rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
      }

      return _rnds;
    };
  }

  // Buffer class to use
  var BufferClass = typeof(Buffer) == 'function' ? Buffer : Array;

  // Maps for number <-> hex string conversion
  var _byteToHex = [];
  var _hexToByte = {};
  for (var i = 0; i < 256; i++) {
    _byteToHex[i] = (i + 0x100).toString(16).substr(1);
    _hexToByte[_byteToHex[i]] = i;
  }

  // **`parse()` - Parse a UUID into it's component bytes**
  function parse(s, buf, offset) {
    var i = (buf && offset) || 0, ii = 0;

    buf = buf || [];
    s.toLowerCase().replace(/[0-9a-f]{2}/g, function(oct) {
      if (ii < 16) { // Don't overflow!
        buf[i + ii++] = _hexToByte[oct];
      }
    });

    // Zero out remaining bytes if string was short
    while (ii < 16) {
      buf[i + ii++] = 0;
    }

    return buf;
  }

  // **`unparse()` - Convert UUID byte array (ala parse()) into a string**
  function unparse(buf, offset) {
    var i = offset || 0, bth = _byteToHex;
    return  bth[buf[i++]] + bth[buf[i++]] +
            bth[buf[i++]] + bth[buf[i++]] + '-' +
            bth[buf[i++]] + bth[buf[i++]] + '-' +
            bth[buf[i++]] + bth[buf[i++]] + '-' +
            bth[buf[i++]] + bth[buf[i++]] + '-' +
            bth[buf[i++]] + bth[buf[i++]] +
            bth[buf[i++]] + bth[buf[i++]] +
            bth[buf[i++]] + bth[buf[i++]];
  }

  // **`v1()` - Generate time-based UUID**
  //
  // Inspired by https://github.com/LiosK/UUID.js
  // and http://docs.python.org/library/uuid.html

  // random #'s we need to init node and clockseq
  var _seedBytes = _rng();

  // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)
  var _nodeId = [
    _seedBytes[0] | 0x01,
    _seedBytes[1], _seedBytes[2], _seedBytes[3], _seedBytes[4], _seedBytes[5]
  ];

  // Per 4.2.2, randomize (14 bit) clockseq
  var _clockseq = (_seedBytes[6] << 8 | _seedBytes[7]) & 0x3fff;

  // Previous uuid creation time
  var _lastMSecs = 0, _lastNSecs = 0;

  // See https://github.com/broofa/node-uuid for API details
  function v1(options, buf, offset) {
    var i = buf && offset || 0;
    var b = buf || [];

    options = options || {};

    var clockseq = options.clockseq != null ? options.clockseq : _clockseq;

    // UUID timestamps are 100 nano-second units since the Gregorian epoch,
    // (1582-10-15 00:00).  JSNumbers aren't precise enough for this, so
    // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'
    // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.
    var msecs = options.msecs != null ? options.msecs : new Date().getTime();

    // Per 4.2.1.2, use count of uuid's generated during the current clock
    // cycle to simulate higher resolution clock
    var nsecs = options.nsecs != null ? options.nsecs : _lastNSecs + 1;

    // Time since last uuid creation (in msecs)
    var dt = (msecs - _lastMSecs) + (nsecs - _lastNSecs)/10000;

    // Per 4.2.1.2, Bump clockseq on clock regression
    if (dt < 0 && options.clockseq == null) {
      clockseq = clockseq + 1 & 0x3fff;
    }

    // Reset nsecs if clock regresses (new clockseq) or we've moved onto a new
    // time interval
    if ((dt < 0 || msecs > _lastMSecs) && options.nsecs == null) {
      nsecs = 0;
    }

    // Per 4.2.1.2 Throw error if too many uuids are requested
    if (nsecs >= 10000) {
      throw new Error('uuid.v1(): Can\'t create more than 10M uuids/sec');
    }

    _lastMSecs = msecs;
    _lastNSecs = nsecs;
    _clockseq = clockseq;

    // Per 4.1.4 - Convert from unix epoch to Gregorian epoch
    msecs += 12219292800000;

    // `time_low`
    var tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
    b[i++] = tl >>> 24 & 0xff;
    b[i++] = tl >>> 16 & 0xff;
    b[i++] = tl >>> 8 & 0xff;
    b[i++] = tl & 0xff;

    // `time_mid`
    var tmh = (msecs / 0x100000000 * 10000) & 0xfffffff;
    b[i++] = tmh >>> 8 & 0xff;
    b[i++] = tmh & 0xff;

    // `time_high_and_version`
    b[i++] = tmh >>> 24 & 0xf | 0x10; // include version
    b[i++] = tmh >>> 16 & 0xff;

    // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)
    b[i++] = clockseq >>> 8 | 0x80;

    // `clock_seq_low`
    b[i++] = clockseq & 0xff;

    // `node`
    var node = options.node || _nodeId;
    for (var n = 0; n < 6; n++) {
      b[i + n] = node[n];
    }

    return buf ? buf : unparse(b);
  }

  // **`v4()` - Generate random UUID**

  // See https://github.com/broofa/node-uuid for API details
  function v4(options, buf, offset) {
    // Deprecated - 'format' argument, as supported in v1.2
    var i = buf && offset || 0;

    if (typeof(options) == 'string') {
      buf = options == 'binary' ? new BufferClass(16) : null;
      options = null;
    }
    options = options || {};

    var rnds = options.random || (options.rng || _rng)();

    // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
    rnds[6] = (rnds[6] & 0x0f) | 0x40;
    rnds[8] = (rnds[8] & 0x3f) | 0x80;

    // Copy bytes to buffer, if provided
    if (buf) {
      for (var ii = 0; ii < 16; ii++) {
        buf[i + ii] = rnds[ii];
      }
    }

    return buf || unparse(rnds);
  }

  // Export public API
  var uuid = v4;
  uuid.v1 = v1;
  uuid.v4 = v4;
  uuid.parse = parse;
  uuid.unparse = unparse;
  uuid.BufferClass = BufferClass;

  if (typeof define === 'function' && define.amd) {
    // Publish as AMD module
    define(function() {return uuid;});
  } else if (typeof(module) != 'undefined' && module.exports) {
    // Publish as node.js module
    module.exports = uuid;
  } else {
    // Publish as global (in browsers)
    var _previousRoot = _global.uuid;

    // **`noConflict()` - (browser only) to reset global 'uuid' var**
    uuid.noConflict = function() {
      _global.uuid = _previousRoot;
      return uuid;
    };

    _global.uuid = uuid;
  }
}).call(this);
//uuid.js
//
//版权所有(c)2010-2012罗伯特·基弗
//麻省理工学院执照-http://opensource.org/licenses/mit-license.php
(功能(){
var _global=这个;
//独特的ID创建需要一个高质量的随机发生器
//检测以确定最佳RNG源,并将其规格化为
//返回128位随机性,因为这是通常需要的
var_rng;
//Node.js基于加密的RNG-http://nodejs.org/docs/v0.6.2/api/crypto.html
//
//速度适中,质量高
if(typeof(require)=“函数”){
试一试{
var_rb=require('crypto')。随机字节;
_rng=_rb&&function(){return_rb(16);};
}捕获(e){}
}
if(!\u rng&&u global.crypto&&crypto.getRandomValues){
//基于WHATWG加密的RNG-http://wiki.whatwg.org/wiki/Crypto
//
//速度适中,质量高
var _rnds8=新的UINT8阵列(16);
_rng=函数whatwgRNG(){
加密。获取随机值(_rnds8);
返回_rnds8;
};
}
如果(!\n rng){
//基于Math.random()的(RNG)
//
//如果所有其他方法都失败,请使用Math.random()。它很快,但没有指定
//质量。
var _rnds=新阵列(16);
_rng=函数(){
对于(变量i=0,r;i<16;i++){
如果((i&0x03)==0)r=Math.random()*0x100000000;
_rnds[i]=r>>>((i&0x03)&options.nsecs==null){
nsecs=0;
}
//根据4.2.1.2,如果请求的UUID太多,则抛出错误
如果(nsecs>=10000){
抛出新错误('uuid.v1():不能创建超过10M个uuid/sec');
}
_lastMSecs=毫秒;
_lastNSecs=nsecs;
_clockseq=clockseq;
//根据4.1.4-从unix纪元转换为公历纪元
毫秒+=12219292800000;
//“时间到了`
变量tl=((毫秒和0xfffffff)*10000+NSEC)%0x100000000;
b[i++]=tl>>>24&0xff;
b[i++]=tl>>>16&0xff;
b[i++]=tl>>>8&0xff;
b[i++]=tl&0xff;
//“时间到了`
变量tmh=(毫秒/0x100000000*10000)&0xfffffff;
b[i++]=tmh>>>8&0xff;
b[i++]=tmh&0xff;
//‘时间高’`
b[i++]=tmh>>>24&0xf | 0x10;//包含版本
b[i++]=tmh>>>16&0xff;
//‘时钟顺序高和保留’(根据4.2.2-包括变体)
b[i++]=clockseq>>>8 | 0x80;
//‘时钟_seq _low’`
b[i++]=clockseq&0xff;
//”“节点`
var node=options.node | | | u nodeId;
对于(变量n=0;n<6;n++){
b[i+n]=节点[n];
}
返回buf?buf:未解析(b);
}
//***`v4()`-生成随机UUID**
//看https://github.com/broofa/node-uuid 有关API的详细信息
功能v4(选项、buf、偏移){
//已弃用-“格式”参数,如v1.2所支持
变量i=buf&&offset | | 0;
if(typeof(options)=“string”){
buf=options==“binary”?新的BufferClass(16):null;
选项=空;
}
选项=选项| |{};
var rnds=options.random | | |(options.rng | | | u rng)();
//根据4.4,为版本和“时钟顺序、高电平”和“保留”设置位`
rnds[6]=(rnds[6]&0x0f)| 0x40;
rnds[8]=(rnds[8]&0x3f)| 0x80;
//将字节复制到缓冲区(如果提供)
如果(buf){
对于(var ii=0;ii<16;ii++){
buf[i+ii]=rnds[ii];
}
}
返回buf | | unpasse(rnds);
}
//导出公共API
var uuid=v4;
uuid.v1=v1;
uuid.v4=v4;
uuid.parse=parse;
uuid.unpasse=unpasse;
uuid.BufferClass=缓冲类;
if(typeof define=='function'&&define.amd){
//发布为AMD模块
定义(函数(){return uuid;});
}else if(模块的类型)!=“未定义”和&module.exports){
//发布为node.js模块
module.exports=uuid;
}否则{
//发布为全局(在浏览器中)
var\u previousRoot=\u global.uuid;
//***`noConflict()`-(仅限浏览器)重置全局“uuid”变量**
uuid.noConflict=函数(){
_global.uuid=\u previousRoot;
返回uuid;
};
_global.uuid=uuid;
}
}).打电话(这个);

这实际上是一个非常有趣的问题,涉及多个层次

首先,值得注意的是,uuid.js支持两种不同形式的id。
uuid.v4()
使用随机数创建id,而
uuid.v1()
基于时间戳创建idid的一部分实际上编码在id本身中,这保证了理论上v4 id不会与v1 id冲突。这是RFC4122 UUID规范的一部分

还值得注意的是,对于v1 id,每个id源都应该有一个唯一的“节点id”,也编码在id中,以保证由该源创建的id序列的唯一性。对于可以访问保证的唯一值(例如设备的MAC地址)的id源这很好。但是uuid.js无法访问这样的值,因此会为其节点id生成一个随机值。这会带来生成与服务器使用的节点id匹配的节点id的风险。节点id为48位值,这意味着节点id冲突的几率为281474976710656:1。因此,有可能,但它是太他妈的低了

…但这些都不重要!

事实证明,尽管
NewSequentialID()
生成的ID表面上与v1 ID相似,但Microsoft决定交换ID中的各个字段,从而破坏RFC4122的兼容性。这意味着,根据序列号,ID可能会或可能会