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Re: PostgreSQL Support Classes [Experimental] [message #9076 is a reply to message #9065]

Mon, 16 April 2007 19:44

mirek is currently offline

mirek
Messages: 13980
Registered: November 2005

Ultimate Member

unodgs wrote on Mon, 16 April 2007 06:13

Quote:

Obviously, not as sexy as simply puttin more "PRIMARY_KEY" columns, OTOH at least Oracle SQL syntax is similar - you have to add it in single contraint, not as several "PRIMARY_KEY" comlums.

If databse is SQL 92 compatible there is posibility to define primary key in single line. It seems that most of db engines support it.

create table t
(
  id integer,
  ver integer,
  type integer,
  ...,
  primary key(id, ver, type)  
)

Sure, above is a direct equivalent of what have now. SQL allows to define single-column keys in the column and multi-column keys as additional contraint...

Quote:

I proposed putting PRIMARY_KEY attribute next to every column to avoid several macros.
Of course I don't know if it is possible to implement it using c preprocessor.

You would have radically change schema code, but I guess it is possible somehow.

Quote:

If not - I suggest to get rid of primary_key attribute as well as DUAL_PRIMARY_KEY and define new macro
PRIMARY_KEY(...) which allow you to define primary key for maximum 5 columns.

Well, but C++ does not have variadic macros (yet?).

BTW, I have just checked and I have used DUAL_PRIMARY_KEY once in my "grand IDIS DB schema" of 500 tables... (OTOH, it is also true that I perhaps deliberately avoid it).

My suggestion is to use current way for now; maybe we can do better when we have all RDBMs implemented and have some experience with it; maybe we will then develop some "common .sch language" to have single .sch for all of them.

Mirek

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[Message index]

		PostgreSQL Support Classes [Experimental] By: zsolt on Sun, 15 April 2007 00:28
		Re: PostgreSQL Support Classes [Experimental] By: unodgs on Sun, 15 April 2007 09:11
		Re: PostgreSQL Support Classes [Experimental] By: fallingdutch on Sun, 15 April 2007 09:19
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Sun, 15 April 2007 16:02
		Re: PostgreSQL Support Classes [Experimental] By: zsolt on Sun, 15 April 2007 17:44
		Re: PostgreSQL Support Classes [Experimental] By: unodgs on Sun, 15 April 2007 20:25
		Re: PostgreSQL Support Classes [Experimental] By: unodgs on Sun, 15 April 2007 20:49
		Re: PostgreSQL Support Classes [Experimental] By: zsolt on Sun, 15 April 2007 20:59
		Re: PostgreSQL Support Classes [Experimental] By: zsolt on Sun, 15 April 2007 21:04
		Re: PostgreSQL Support Classes [Experimental] By: zsolt on Sun, 15 April 2007 21:18
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Mon, 16 April 2007 09:20
		Re: PostgreSQL Support Classes [Experimental] By: unodgs on Mon, 16 April 2007 10:22
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Mon, 16 April 2007 10:37
		Re: PostgreSQL Support Classes [Experimental] By: unodgs on Mon, 16 April 2007 12:13
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Mon, 16 April 2007 19:44
		Re: PostgreSQL Support Classes [Experimental] By: unodgs on Mon, 16 April 2007 20:11
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Mon, 16 April 2007 20:37
		Re: PostgreSQL Support Classes [Experimental] By: unodgs on Mon, 16 April 2007 22:42
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Tue, 17 April 2007 00:01
		Re: PostgreSQL Support Classes [Experimental] By: zsolt on Mon, 16 April 2007 19:43
		Re: PostgreSQL Support Classes [Experimental] By: jibe on Mon, 16 April 2007 18:46
		Re: PostgreSQL Support Classes [Experimental] By: zsolt on Mon, 16 April 2007 19:57
		Re: PostgreSQL Support Classes [Experimental] By: jibe on Tue, 17 April 2007 09:08
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Tue, 17 April 2007 11:53
		Re: PostgreSQL Support Classes [Experimental] By: jibe on Wed, 18 April 2007 08:57
		Re: PostgreSQL Support Classes [Experimental] By: tojocky on Thu, 01 May 2008 16:53
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Thu, 01 May 2008 22:55
		Re: PostgreSQL Support Classes [Experimental] By: tojocky on Sun, 04 May 2008 10:15
		Re: PostgreSQL Support Classes [Experimental] By: zsolt on Sun, 04 May 2008 11:24
		Re: PostgreSQL Support Classes [Experimental] By: tojocky on Mon, 05 May 2008 17:12
		Re: PostgreSQL Support Classes [Experimental] By: mr_ped on Mon, 05 May 2008 20:59
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Mon, 05 May 2008 22:14
		Re: PostgreSQL Support Classes [Experimental] By: tojocky on Tue, 06 May 2008 17:24
		Re: PostgreSQL Support Classes [Experimental] By: mirek on Tue, 06 May 2008 19:45

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