Postgres Pro
Downloads
Home   >   mailing lists

Thread: Variables.

Variables.

From
"Aasmund Midttun Godal"
Date:
I would really like a feature :)

I do not know whether it is  part of the SQL standard.

Variables...

e.g.

CREATE VARIABLE foobar INTEGER DEFAULT 1 NOT NULL;

SELECT * FROM thebar WHERE id = foobar;

CREATE TEMPORARY VARIABLE...
CREATE CONSTANT....

Basically all the functionality from the table columns (CHECK and REFERENCES...) and it must take any type, so that you
canuse user-created types as well.
 

SET foobar 3;

it could adopt properties from both runtime info and sequences...

My abilities in C, as in many other things is severely limited so I am asking someone else to do the dirtywork :). And
Ido appreciate that this may take some time.
 

It would be nice to have some sort of GRANT revoke SCHEME on it too...

I do acknowledge that this can be achieved with temporary and non temporary tables, but it can get ugly with these.

While I am at it I would highly suggest that there is some sort of SESSION_ID environment variable.

Some of the uses:

* Store things like personal  preferences
* Parameters from a webserver
* Client application name
* etc.






Aasmund Midttun Godal

aasmund@godal.com - http://www.godal.com/
+47 40 45 20 46

Re: Variables.

From
"Josh Berkus"
Date:
Aasmund,

> I do not know whether it is  part of the SQL standard.
>
> Variables...

Nope.

> CREATE VARIABLE foobar INTEGER DEFAULT 1 NOT NULL;
>
> SELECT * FROM thebar WHERE id = foobar;
>
> CREATE TEMPORARY VARIABLE...
> CREATE CONSTANT....

Extensive support for a variety of variable types and constructions is
available in FUNCTIONS.  PL/pgSQL, PL/TCL, PL/Perl ... take your pick.

For the raw command-line SQL, variables, constants, and other procedural
language elements are not appropriate.  This is best done in procedures,
functions, and middleware.

Of course, it is an Open-Source project, so if you hire your own
programmer, you can do anything you want.

-Josh Berkus

______AGLIO DATABASE SOLUTIONS___________________________
                                       Josh Berkus
  Complete information technology      josh@agliodbs.com
   and data management solutions       (415) 565-7293
  for law firms, small businesses        fax 621-2533
    and non-profit organizations.      San Francisco
Attachment