Guids，Unique Id和Hashes [英] Guids, Unique Id's and Hashes
问题描述
我使用Guid'作为数据应用程序中的唯一标识符。但是在最近的一个项目中，Guid'字符串的长度证明太长了。有没有一种方法可以生成一个比Guid长度少的b / b
的唯一字符串？
如果我要使用Guid字符串的哈希值，两个不同的Guid会有相同的哈希值的可能性是多少？
任何人都可以提供任何其他建议吗？
谢谢
I have used Guid''s as a unique identifier in data applications. But in
a recent project, the length of the Guid''s string is proving to be too
long. Is there a method for generating a unique string that is less
than the length of a Guid?
If I were to take the hash of a Guid string, what is the likelyhood
that two different Guids would have the same hash?
Can anyone offer any other suggestions?
Thanks
推荐答案
" Chris Dunaway" <杜****** @ gmail.com> schrieb：
"Chris Dunaway" <du******@gmail.com> schrieb:
我在数据应用程序中使用了Guid'作为唯一标识符。但是在最近的一个项目中，Guid'字符串的长度证明太长了。有没有一种方法可以生成一个比Guid长度更小的独特字符串？
I have used Guid''s as a unique identifier in data applications. But in
a recent project, the length of the Guid''s string is proving to be too
long. Is there a method for generating a unique string that is less
than the length of a Guid?
我很好奇最大值。您描述的
场景中标识符的字符数是...
-
MS Herfried K. Wagner
MVP< URL：http：//dotnet.mvps.org/>
VB< URL：http：//classicvb.org/petition/>
I am curious what the max. number of characters for the identifier in the
scenario you describe is...
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
目前，该字段的长度为30个字符，但其中的数据
采用以下格式（不要问我为什么，我继承了这个
代码）：
< custnum> - < uniqueid> - < city，state> ;
整个字符串必须是唯一的。 custnum，city和state必须
也是字符串的一部分。
我可以增加字段的大小，但我必须在许多其他表中增加
这个相同字段的大小。除非我必须这样做，否则我犹豫不决。
。
我试图确定缩短字符串的方法。
谢谢
At the moment, the length of the field is 30 characters, but the data
in it is in the following format (don''t ask me why, I inherited this
code):
<custnum>-<uniqueid>-<city,state>
The entire string must be unique. The custnum, city, and state must
also be part of the string.
I can increase the size of the field, but I would then have to increase
the size of this same field in many other tables. I am hesitant to do
this unless I have to.
I was trying to determine a method to shorten the string.
Thanks
它只有8个字节 - 所以我猜你是不是在存储GUID号码，
但是实际解码后的字符串，你会占用更多的空间;）
" Chris Dunaway" <杜****** @ gmail.com>在消息中写道
news：11 ********************** @ z14g2000cwz.googlegr oups.com ...
It''s 8 bytes only - so I''m guessing if you aren''t storing the GUID number,
but instead the actual decoded string, you will use up a tad more space ;)
"Chris Dunaway" <du******@gmail.com> wrote in message
news:11**********************@z14g2000cwz.googlegr oups.com...
我使用Guid'作为数据应用程序中的唯一标识符。但是在最近的一个项目中，Guid'字符串的长度证明太长了。有没有一种方法可以生成一个比Guid长度更小的唯一字符串？
如果我要使用Guid字符串的哈希值，那么可能性是什么？ >两个不同的Guids会有相同的哈希值吗？
任何人都可以提供任何其他建议吗？
谢谢
I have used Guid''s as a unique identifier in data applications. But in
a recent project, the length of the Guid''s string is proving to be too
long. Is there a method for generating a unique string that is less
than the length of a Guid?
If I were to take the hash of a Guid string, what is the likelyhood
that two different Guids would have the same hash?
Can anyone offer any other suggestions?
Thanks
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