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
14  2690 
"Chris Dunaway" <du******@gmail.com> schrieb: 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?
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/>
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
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... 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
"Chris Dunaway" <du******@gmail.com> schrieb: 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?
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/>
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
Robin, 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 ;)
Are you sure of this and in my opinion serialized it will be more. http://msdn.microsoft.com/library/de...classtopic.asp
Cor
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... 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
"Robin Tucker" <id*************************@reallyidont.com> schrieb: 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 ;)
GUIDs are 16 bytes...
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
My mistake, I didn't divide 128 bits by 8 correctly :/
"Herfried K. Wagner [MVP]" <hi***************@gmx.at> wrote in message
news:uF**************@TK2MSFTNGP14.phx.gbl... "Robin Tucker" <id*************************@reallyidont.com> schrieb: 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 ;)
GUIDs are 16 bytes...
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
Yes, what I meant to say was that, a guid being 16 bytes (ehem, excuse my
math) might look like this:
ABACACABACACBACD (128 bits = 16 bytes = 16 ASCII chars)
but stored as a string it will be bigger, like this:
00000118-0000-0000-C000-000000000046 (36 characters)
"Cor Ligthert" <no************@planet.nl> wrote in message
news:Oi**************@TK2MSFTNGP15.phx.gbl... Robin,
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 ;)
Are you sure of this and in my opinion serialized it will be more.
http://msdn.microsoft.com/library/de...classtopic.asp
Cor
Robin, 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 ;)
Are you sure of this and in my opinion serialized it will be more. http://msdn.microsoft.com/library/de...classtopic.asp
Cor
"Robin Tucker" <id*************************@reallyidont.com> schrieb: 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 ;)
GUIDs are 16 bytes...
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
My mistake, I didn't divide 128 bits by 8 correctly :/
"Herfried K. Wagner [MVP]" <hi***************@gmx.at> wrote in message
news:uF**************@TK2MSFTNGP14.phx.gbl... "Robin Tucker" <id*************************@reallyidont.com> schrieb: 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 ;)
GUIDs are 16 bytes...
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
Yes, what I meant to say was that, a guid being 16 bytes (ehem, excuse my
math) might look like this:
ABACACABACACBACD (128 bits = 16 bytes = 16 ASCII chars)
but stored as a string it will be bigger, like this:
00000118-0000-0000-C000-000000000046 (36 characters)
"Cor Ligthert" <no************@planet.nl> wrote in message
news:Oi**************@TK2MSFTNGP15.phx.gbl... Robin,
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 ;)
Are you sure of this and in my opinion serialized it will be more.
http://msdn.microsoft.com/library/de...classtopic.asp
Cor This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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