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Re: Access a Field / Column of a resultset by Number

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hy scott,  thanks for your awnser.

yes thats clear. but i can't find any sourcecode. the pl* language doesnt matter, i need that feature only in one function all over my db.

did you have any sourcecode examples?

http://www.postgresql.org/docs/8.4/interactive/plperl-database.html

nothing about how to access a column by fieldname.

daniel

Scott Marlowe schrieb:
On Fri, Nov 27, 2009 at 10:09 AM, Daniel Schuchardt
<d.schuchardt@xxxxxxxxxxxxx> wrote:
thats exactly the same i'm looking for:

http://wiki.postgresql.org/wiki/Todo
http://archives.postgresql.org/pgsql-patches/2005-07/msg00458.php

(todo list for plpgsql)

*Server-Side Languages
*PL/pgSQL
*
*[D] Allow listing of record column names, and access to record columns *via
variables, e.g. columns := r.(*), tval2 := r.(colname)
*
*Re: PL/PGSQL: Dynamic Record Introspection


is that is possible in any pl* language?

Yes, if the language has the architecture to handle it.  plpgsql
doesn't right now.  pltcl, plperl, and plain old C functions can
examine records and do dynamic stuff with them.  Any attempt at doing
dynamic queries right now in plpgsql leads to madness, or so I've been
told.



--
Daniel Schuchardt
/Softwareentwicklung/

/http://www.prodat-sql.de/

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