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Re: [HACKERS] Re: [INTERFACES] retrieving varchar size

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: byronn(at)insightdist(dot)com (Byron Nikolaidis)
Cc: hannu(at)trust(dot)ee, daveh(at)insightdist(dot)com, pgsql-hackers(at)postgreSQL(dot)org, pgsql-interfaces(at)postgreSQL(dot)org
Subject: Re: [HACKERS] Re: [INTERFACES] retrieving varchar size
Date: 1998-04-24 04:05:30
Message-ID: 199804240405.AAA25030@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-interfaces
> 
> 
> 
> Bruce Momjian wrote:
> 
> > > The problem with that theory is this.  If the frontend application just
> > > executes some random query, such as "select * from table", you really do not
> > > know anything about what is coming back. You must rely on the little bit of
> > > information the protocol gives you.  In the case of Postgres, it gives you
> > > the fieldname, datatype, and size for each column in the result.
> > > Unfortunately, for varchar and char(n), the size reports -1.  This is not
> > > very helpful for describing the result set.
> > >
> > > Your above example works fine (in fact we use that already) when you know the
> > > table and column name, as in metadata functions such as SQLColumns() in the
> > > ODBC driver.
> >
> > Yep.  We could pass back atttypmod as part of the PGresult.  I can add
> > that to the TODO list.  Would that help?
> 
> Yes, that would do it!
> 
> Thank you for listening to our ravings on this issue.

Added to TODO:

	* Add pg_attribute.atttypmod/Resdom->restypmod to PGresult structure

This is a good suggestion.

-- 
Bruce Momjian                          |  830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us              |  Drexel Hill, Pennsylvania 19026
  +  If your life is a hard drive,     |  (610) 353-9879(w)
  +  Christ can be your backup.        |  (610) 853-3000(h)

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