Comments on: ColdFusion UUID and MSSQL newID() http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/ development in a land far far away... Thu, 21 Aug 2008 18:37:21 +0000 http://wordpress.org/?v=abc By: chapter31 » Blog Archive » Returning random results with MySQL http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-43448 chapter31 » Blog Archive » Returning random results with MySQL Fri, 28 Mar 2008 17:01:25 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-43448 [...] mightn’t be so bad. Another constraint is that it assumes an integer primary key which you may not be using, meaning the randRange() won’t work. Also what happens if you don’t have sequential [...] [...] mightn’t be so bad. Another constraint is that it assumes an integer primary key which you may not be using, meaning the randRange() won’t work. Also what happens if you don’t have sequential [...]

]]> By: Adrian Lynch http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-30590 Adrian Lynch Tue, 18 Dec 2007 13:10:21 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-30590 I don't like using them as a PK, but I do use them as a public ID for unsubscribe emails, URLs made public etc. So if I need them I have both a regular userID column and a publicUserID column in the same table. It's worked out nicely so far. I don’t like using them as a PK, but I do use them as a public ID for unsubscribe emails, URLs made public etc.

So if I need them I have both a regular userID column and a publicUserID column in the same table.

It’s worked out nicely so far.

]]> By: Michael Sharman http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1653 Michael Sharman Wed, 31 Jan 2007 10:13:53 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1653 Hi Adam, You might want to do aggregate functions on an int (identity), especially during development. You know...give me all users with an ID > 100 or something. Just makes is easy. You wouldn't of course want to do it on a UUID :) Sorry about the less than/greater than...I'm using Wordpress which is PHP. It's actually fantastic, but I'd much rather be using a ColdFusion blog! Something I need to look into soon :) Hi Adam,

You might want to do aggregate functions on an int (identity), especially during development. You know…give me all users with an ID > 100 or something. Just makes is easy. You wouldn’t of course want to do it on a UUID :)

Sorry about the less than/greater than…I’m using Wordpress which is PHP. It’s actually fantastic, but I’d much rather be using a ColdFusion blog!

Something I need to look into soon :)

]]> By: Adam Cameron http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1650 Adam Cameron Wed, 31 Jan 2007 09:56:44 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1650 "Why on Earth would you WANT to do max(), min(), on a UUID?" should read "Why on Earth would you WANT to do max(), min(), < or > on a UUID? How come your blog removes angle-brackets (well, in this case, contextually they WEREN'T angle brackets). -- Adam “Why on Earth would you WANT to do max(), min(), on a UUID?”

should read

“Why on Earth would you WANT to do max(), min(), < or > on a UUID?

How come your blog removes angle-brackets (well, in this case, contextually they WEREN’T angle brackets).

–
Adam

]]> By: Adam Cameron http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1649 Adam Cameron Wed, 31 Jan 2007 09:55:03 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1649 Hi again Sorry, I was not suggesting using a CF-formatted UUID for anything. I was meaning "an actual UUID" (not one of CF's strings). So, on MS-SQL, yeah, a "uniqueidentifier". Why on Earth would you WANT to do max(), min(), on a UUID? It makes no sense to want to. I think if one finds oneself doing that sort of thing... time to rethink the DB schema, or what one's actually trying to achieve (because the approach is probably wrong). Anyway, interesting input from everyone, so that's all good! :-) -- Adam Hi again
Sorry, I was not suggesting using a CF-formatted UUID for anything. I was meaning “an actual UUID” (not one of CF’s strings). So, on MS-SQL, yeah, a “uniqueidentifier”.

Why on Earth would you WANT to do max(), min(), on a UUID? It makes no sense to want to. I think if one finds oneself doing that sort of thing… time to rethink the DB schema, or what one’s actually trying to achieve (because the approach is probably wrong).

Anyway, interesting input from everyone, so that’s all good! :-)

–
Adam

]]> By: Michael Sharman http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1613 Michael Sharman Tue, 30 Jan 2007 21:34:57 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1613 Tony: Although you can use > and < your primary keys are sequential so (particularly during development) you need to find something else to use when you want to quickly grab a range of records. Most likely you'll have a DateTimeCreated or some such column, but an int/identity does make it easier :) Christopher: Thanks for the link, nice one! If you were in a stored procedure you could of course create a single newID() and put it in a variable to use, but this way is just simpler! Thanks again Tony: Although you can use > and < your primary keys are sequential so (particularly during development) you need to find something else to use when you want to quickly grab a range of records. Most likely you’ll have a DateTimeCreated or some such column, but an int/identity does make it easier :)

Christopher: Thanks for the link, nice one! If you were in a stored procedure you could of course create a single newID() and put it in a variable to use, but this way is just simpler! Thanks again

]]> By: Christopher Wigginton http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1606 Christopher Wigginton Tue, 30 Jan 2007 15:59:00 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1606 Great post Michael, Your concat function which uses newid() twice is actually creating two ms uuids and you're combining them together. This is ideal for a user defined function which would be reusable across the database. I whipped up quick function for this and put it on my blog if you're interested. <a href="http://www.intersuite.com/client/index.cfm/2007/1/30/MSSQL-CFUUID-Function" rel="nofollow">MSSQL CFUUID Function</a> Great post Michael,

Your concat function which uses newid() twice is actually creating two ms uuids and you’re combining them together. This is ideal for a user defined function which would be reusable across the database. I whipped up quick function for this and put it on my blog if you’re interested.

MSSQL CFUUID Function

]]> By: Steve Nelson http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1604 Steve Nelson Tue, 30 Jan 2007 14:04:21 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1604 ugggh, < didnt work. <cfset myid=replace(createuuid(),"-","","all")> ugggh, < didnt work.

<cfset myid=replace(createuuid(),”-”,”",”all”)>

]]> By: Steve Nelson http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1603 Steve Nelson Tue, 30 Jan 2007 14:03:28 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1603 I'm an avid believer in UUIDs, but i can't stand the hyphons. So much so that i strip the hyphons out completely. The problem is that Javascript doesn't like hyphons in variable name. So in the fairly common situation where i have loop over PKs and dynamically name a hidden variable or a checkbox etc, the hyphons screw up the javascript code. Sorry hyphons, but you ahve to go: I’m an avid believer in UUIDs, but i can’t stand the hyphons. So much so that i strip the hyphons out completely. The problem is that Javascript doesn’t like hyphons in variable name. So in the fairly common situation where i have loop over PKs and dynamically name a hidden variable or a checkbox etc, the hyphons screw up the javascript code. Sorry hyphons, but you ahve to go:

]]> By: tony petruzzi http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1602 tony petruzzi Tue, 30 Jan 2007 13:38:49 +0000 http://www.chapter31.com/2007/01/30/coldfusion-uuids-and-mssql-newid/#comment-1602 you can perform > and you can perform > and

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