[R] RODBC connections w/o specific database

Prof Brian Ripley
2007-04-16T15:34:28Z

On Mon, 16 Apr 2007, Pete Cap wrote:

> Folks,
>
> I'm writing a gui wrapper around RODBC (having abandoned RMySQL) and
> some custom analysis scripts.  I'm hoping that I could get some advice.
>
> All of my users will have access to a database server.  I am going to
> limit their access to certain databases--a sizeable warehouse in a SAN,
> and then smaller storage that they can use for temp files and personal
> tables.  I want to present these to the user using a tktree widget,
> rather like you might see in Enterprise Guide, with the top level of
> each tree being a specific database and branches being tables.
>
> Can I get some advice on a good way to accomplish this?
>
> Right now I can create and connect to a DSN that does not specify a
> database.  I suppose that upon connection I could use sqlQuery to get
> the names of databases and their tables, then use the result to populate
> the tree.  However, once a table has been selected, would I need to
> create a new connection (since the existing connection does not specify
> a database) or could I use the existing one for everything and just
> specify database and table in my queries?

You could, but then your tables would all need to accessed via db.table
names (assuming your DBMS supports that).  Opening a new connection is
cheap (and will be cheaper in RODBC 1.2.z) so I would just do that.

>
> Also, any additional advice on would be appreciated if anyone has any.
>
> Thanks,
>
> Pete
>
>
> ---------------------------------
>
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--
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595