自从MongoDB升级到2.4之后，User系统，或者说是权限系统有了翻天覆地的变化。 在MongoDB2.4之前的User系统，除了用户名和密码之外，只有一个ReadOnly属性。 如果一个用户在admin数据库里面进行了登陆，则admin数据库里面的Readonly属性将被沿用到其他所有的
自从MongoDB升级到2.4之后，User系统，或者说是权限系统有了翻天覆地的变化。
在MongoDB2.4之前的User系统，除了用户名和密码之外，只有一个ReadOnly属性。
如果一个用户在admin数据库里面进行了登陆，则admin数据库里面的Readonly属性将被沿用到其他所有的数据库。
这样的权限管理当然是最最容易管理的，任何能够登入到MongoDB的用户，如果在Admin的数据库的用户表里面存在记录，则对于整个服务器上的所有数据库的访问权限也就固定下来了。
当然，用户可以了在个别的数据库的用户表中定义自己的权限。所谓的权限也就是只读或者非只读。
到了2.4之后，MongoDB的用户模型发生了很大的变化
MongoUser（2.4之前）
用户名
密码
是否只读
MongoUser（2.4之后）
用户名
密码
角色
其他数据库角色（如果该用户在Admin数据库的User表里面登陆的话，可以个别指定对于具体数据库访问的权限）
外部验证
“角色”这个概念，也“是否只读”比起来，内容丰富多了，不同的角色可以进行的操作是不同的，有的可以管理用户，看得到用户表，有的只能看到普通的数据表。
最近一直在对用户和权限进行研究，总结了一下心得：
1.由于要顾及以前的版本，ReadOnly属性还是可以使用的，不过，ReadOnly和Role是不能共存的
2.密码和外部验证，也是不能共存的，要么用密码验证身份，要么用外部验证数据库来验证身份
3.其他数据库角色只能在Admin里面进行登录。
接下来说说坑爹的C#的驱动程序：C#的驱动程序，对于MongoUser的巨大变化，还没有开始进行对应。自己动手丰衣足食，我现在的开发都是使用自己改写的MongoUser类。
我不是很明白，为什么C#驱动不对应MongoUser的变化，我也不清楚其他语言的驱动程序是否也没有对应。。。。
这里是新的添加用户的GUI
添加了用户后，请不要忘记在启动MongoDB的时候加上 --auth的参数，不然的话，默认是不会启动认证的，不管是谁，都是完全的Admin的权限。
如果对于我的GUI工具感兴趣，Github上面有所有的代码
https://github.com/magicdict/MagicMongoDBTool
这次工具开始尝试提供性能监视工具，当然，只是一个小的尝试罢了。
再说几句题外话，最近IBM宣布和10gen（MongoDB的开发公司）进行合作。我不知道IBM准备多大限度的支持MongoDB。但是不管怎么说，，对于MongoDB的爱好者来说，是一个不错的消息。
MongoDB现在还是冷门的数据库。园子里面也少有介绍MongoDB的文章，或者即使介绍，也是入门级别的。
技术就像赌博一样，谁知道明年的这个时候，Mongo是不是会大红大紫，成为另一个Oracle。不管怎么样，先投资一下吧。。。。。
想要直接体验工具的： Net3.5是必须的。。。。
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