Обсуждение: how to store a query, that results in a table

hi.
I have a problem.
I require to store a query sql in postgresql-7.0 like:
example.
select * from table1 where row1(table1)=parameter1
If i execute this query directly, I don't have problem.
I want to store this query in order to execute from a client program
(visual basic 6.0), but i don't know how to?
I tried to store the query like a function (create function ...), but it
was impossible to find a way in order to obtain a table like result.
Only we could obtain a single row by using the rtype " returns setof
varchar".
I hope a soon answer.
Thank you.
 Nelson B.

thank you jie Liang for your response, but my problems are:
1. How to store a query in the database.
2. How to give a parameter from outside of database, for example:
select * from table1 where row1 = my_parameter_outside.
Give me an example please.

Summary:  Proposed solution, and question on efficiency of technique

I don't know if this is what you are looking for, but I have a database where
I needed a relatively complex view (which I can do thanks to the expanded view
buffer in 7.0!, it didn't fit in 6.5.3), but I need to pass an "effective
date" to the view that needed to be in a range (so I couldn't just use a
column in one of the source tables) to get the results I want.  My "solution"
was to come up with an "effective dates" table with one column (primary keyed)
that I can put the dates in.  For example:

create table effective_date (date date, primary key (date) );

create view complex_view as select blah, ..... , effective_date.date
from tablea, tableb, tablec, effective_date
where tablea.foo=tableb.foo
   ....
  and effective_date.date between tablec.start_date=tablec.end_date
;

then, when I want to select rows from the view, I have to INSERT the date I
want into the "effective_date" table (which is effectively my "parameter"),
then I can select it from the view.  i.e.:

insert into effective_date values ('09/23/2000');  -- may "fail" if date is
already in the table, but if it is, who cares?

select *
from complex_view
where date='09/23/2000';

Now it would certainly be nicer if I could set some kind of global system
variable to the date, then reference that system variable in the view, but I
couldn't figure out any way to do it.  If anyone in the know is screaming out
loud at this technique, please point me in the right direction, I would love
to be able to skip the "Insert into effective_date..." step.

-paul



Keith Wong wrote:

> This is not really possible with postgresql at the moment.
> Better off trying to work around, perhaps using a view. That way you have a
> way to change the select
> statement without actually modifying your client code.
>
> Keith.
>
> At 06:09 PM 22/09/2000 -0400, Nelson wrote:
> >thank you jie Liang for your response, but my problems are:
> >1. How to store a query in the database.
> >2. How to give a parameter from outside of database, for example:
> >select * from table1 where row1 = my_parameter_outside.
> >Give me an example please.
> >
> >

Paul Wehr <paul@industrialsoftworks.com> writes:
> create view complex_view as select blah, ..... , effective_date.date
> from tablea, tableb, tablec, effective_date
> where tablea.foo=tableb.foo
>    ....
>   and effective_date.date between tablec.start_date=tablec.end_date
> ;

> insert into effective_date values ('09/23/2000');  -- may "fail" if date is
> already in the table, but if it is, who cares?

> select *
> from complex_view
> where date='09/23/2000';

Er, why don't you just do

select * from complex_view
where '09/23/2000' between start_date and end_date;

I don't see what the effective_date table is buying ...

            regards, tom lane