Comments on: PostgreSQL 8.3: UUID, XML, ENUMs… http://www.ghidinelli.com/2008/02/04/postgresql-83-uuid-xml-enums Thu, 01 Jun 2017 18:51:00 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Jochem van Dieten http://www.ghidinelli.com/2008/02/04/postgresql-83-uuid-xml-enums/comment-page-1#comment-43911 Jochem van Dieten Wed, 06 Feb 2008 11:29:03 +0000 http://www.ghidinelli.com/2008/02/04/postgresql-83-uuid-xml-enums/#comment-43911 The <a href="http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/uuid.c?rev=1.7;content-type=text%2Fx-cvsweb-markup" rel="nofollow">PostgreSQL impelmentation</a> is to remove all hyphens, convert the resulting 32 hex characters to a 16-byte string and use that string internally. Only when outputted to a front-end it is converted back to a 36-byte string. The PostgreSQL impelmentation is to remove all hyphens, convert the resulting 32 hex characters to a 16-byte string and use that string internally. Only when outputted to a front-end it is converted back to a 36-byte string.

]]> By: brian http://www.ghidinelli.com/2008/02/04/postgresql-83-uuid-xml-enums/comment-page-1#comment-43886 brian Tue, 05 Feb 2008 17:37:07 +0000 http://www.ghidinelli.com/2008/02/04/postgresql-83-uuid-xml-enums/#comment-43886 MSSQL does have a "uniqueidentifier" type which is a GUID storage bin that does something numeric or bit behind the scenes. I'm guessing that Postgres' implementation is similar. It's interesting there still isn't a createGUID() function in ColdFusion since you can check isValid("guid", value). Check but not create? Kind of silly. The livedocs even point to your function on cflib.org! MSSQL does have a “uniqueidentifier” type which is a GUID storage bin that does something numeric or bit behind the scenes. I’m guessing that Postgres’ implementation is similar.

It’s interesting there still isn’t a createGUID() function in ColdFusion since you can check isValid(“guid”, value). Check but not create? Kind of silly. The livedocs even point to your function on cflib.org!

]]> By: Nathan D http://www.ghidinelli.com/2008/02/04/postgresql-83-uuid-xml-enums/comment-page-1#comment-43866 Nathan D Mon, 04 Feb 2008 21:53:28 +0000 http://www.ghidinelli.com/2008/02/04/postgresql-83-uuid-xml-enums/#comment-43866 I have not looked at all at this version of PostgreSQL, but I seem to recall back in the day there were reasons to use the 36-char ID with MS SQL Server due to the way the underlying engine dealt with the indexing -- something about storing it in some more efficient form than a char(35) (and my lack of specific knowledge on this is a clear sign I ought not be posting this suggestion). And since I was literally shocked to find out how long ago I wrote this function, I will give the obligatory link to the (silly simple) createGUID function on CFLib: http://www.cflib.org/udf.cfm?ID=54 I have not looked at all at this version of PostgreSQL, but I seem to recall back in the day there were reasons to use the 36-char ID with MS SQL Server due to the way the underlying engine dealt with the indexing — something about storing it in some more efficient form than a char(35) (and my lack of specific knowledge on this is a clear sign I ought not be posting this suggestion).

And since I was literally shocked to find out how long ago I wrote this function, I will give the obligatory link to the (silly simple) createGUID function on CFLib: http://www.cflib.org/udf.cfm?ID=54

]]>