how to store a query, that results in a table

Hi, there,

If the client machine is a trusted machine in your company, use remote
shell 'rsh' can
call a script of SQL.
If not , you had better use embeded SQL.

I don't know how visual basic embed SQL, but I think is same way as other
language,
in postgres:
#db> create user robot with password 'wowwow';
$db> grant all on table1 to robot;

In perl , it's very similar like this:
use Pg;
my $conn;
sub connectDb {
$conn = Pg::connectdb("dbname=db host=dbserver port=5432
user=robot password=wowwow");
if ( $conn->status != Pg::PGRES_CONNECTION_OK ) {
die "Cant open postgres! : " . $conn->errorMessage . "\n";
}
return;
}
#main
connectDb();
my $query="select * from table1 where row1=parameter1";
print $query,"\n";
my $res=$conn->exec($query);
$res->cmdStatus || die $conn->errorMessage.":$!\n";
my $rows= $res->ntuples;
for (my $k = 0 ; $k < $rows; $k++){
my $field1=$res->getvalue($k,0);
my $field2=$res->getvalue($k,1);
print $field1,"\t",field2,"\n";
}

root wrote:

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.

--
Jie LIANG

Internet Products Inc.

10350 Science Center Drive
Suite 100, San Diego, CA 92121
Office:(858)320-4873

jliang@ipinc.com
www.ipinc.com

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.

Hi,
So, your question is not client side,
you want store a procedure in db(server side) can accept para from
client side.
I have not seen Pg has a functionality to do like store procedure or
package like Oracle
( maybe I don't know), so , I suggest that :
1 use embeded SQL
2. store query as a SQL in shell script( because shell script can accept
parameters)
in shell , you can say:
echo "select * from table1 where row1=$1"|rsh pg_server
/usr/local/pgsql/bin/psql -U robt db
(e.g . remote shell call, local is same)
3. if you use bash shell, you can also use
pgbash(http://www.psn.co.jp/PostgreSQL/pgbash/index-e.html)

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.

--
Jie LIANG

Internet Products Inc.

10350 Science Center Drive
Suite 100, San Diego, CA 92121
Office:(858)320-4873

jliang@ipinc.com
www.ipinc.com

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:

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:

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