Thread: PostgreSQL User-Defined Global Variables

Is it possible, via standard PostgreSQL or an extension, to set up a user-defined global variable outside of a stored
procedure,and be able to query against the value of that variable?
 

On Wed, Jul 06, 2005 at 03:16:56PM -0400, Van Ingen, Lane wrote:
>
> Is it possible, via standard PostgreSQL or an extension, to set
> up a user-defined global variable outside of a stored procedure,
> and be able to query against the value of that variable?

Some people use temporary tables for storing such values.  Another
way would be to write set/get functions in a language that supports
global storage (PL/Perl, PL/Tcl, PL/Python, etc.).  See for example
the set_var() and get_var() functions in the PL/Perl documentation:

http://www.postgresql.org/docs/8.0/static/plperl-global.html

--
Michael Fuhr
http://www.fuhr.org/~mfuhr/

am  06.07.2005, um 15:16:56 -0400 mailte Van Ingen, Lane folgendes:
> Is it possible, via standard PostgreSQL or an extension, to set up a
> user-defined global variable outside of a stored procedure, and be
> able to query against the value of that variable?

You can use languages like plperl to store persistent data, a nice
example is there: http://www.varlena.com/varlena/GeneralBits/ ( Show
Previous Row Values in plperl)



Regards, Andreas
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Andreas Kretschmer    (Kontakt: siehe Header)
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