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 |
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Lists: | pgsql-hackers pgsql-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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