On 5/28/19 8:06 AM, RAJIN RAJ K wrote:
Please reply to list also.
Ccing list.
Thanks for the response.
CTE is not useful in my case. Here i want to pass the table to a
function and get the filtered results back from the function.
I tried few but not use full.
1. Pass table input --> Ref cursor is the only option but which again
require loop to fetch the records. (FETCH ALL results cannot be stored
in a variable)
Here im creating temp table withe required input data before the
function call.
I'm going to take a stab at this though I do not entirely follow the
logic. Definitely not tested:
1) create function filter_id(tbl_name varchar)
return table (id bigint)
begin
--> Assuming input table is already created #temp_input_id
return query EXECUTE format('select id '
'from tbl a '
'inner join'
'%I b on (a.id = b.id)'
'where a.<conditions>', tbl_name);
end;
2) In calling function:
WITH temp_tbl AS (select id from tbla...
), filter_tbl AS (select * from filter_id(temp_bl))
select a.*
from tb3 a inner join tb4 inner join tb 5 inner join filter_tbl;
On Tue, May 28, 2019 at 8:29 PM Adrian Klaver <adrian.klaver@xxxxxxxxxxx
<mailto:adrian.klaver@xxxxxxxxxxx>> wrote:
On 5/28/19 7:36 AM, RAJIN RAJ K wrote:
> --> Function ' filter_id ' filters the ID's based on some conditions.
> --> Input is set of ID's. (Not directly taking the input since
there is
> no provision to pass multiple rows to a function)
To be honest I cannot follow what you are trying to achieve below. I do
have one suggestion as to creating temp tables.
Why not use a CTE:
https://www.postgresql.org/docs/11/queries-with.html
in the function to build a 'temp' table on the fly?
>
> create function filter_id()
> return table (id bigint)
> begin
>
> --> Assuming input table is already created #temp_input_id
>
> retun query as select id
> from tbl a
> inner join
> #temp_input_id b on (a.id <http://a.id> <http://a.id> = b.id
<http://b.id> <http://b.id>)
> where a.<conditions>;
>
> end;
>
>
> --> Calling Function:
>
> create function caller()
> return table (id bigint,col1 bigint, col2 bigint)
> begin
>
> --> do some processing
>
> --> Find out the input id's for filtering.
>
> --> Create temp table for providing input for the filtering function
>
> create temp table #TEMP1
> as select id from tbla........;
> (Cannot move the input id logic to filter_function)
>
> --> calling the filter function
> create temp table #TEMP2
> as select * from filter_id(); --> This is a generic function used in
> many functions.
>
>
> return query
> as select a.*
> from tb3 a inner join tb4 inner join tb 5 inner join #TEMP2;
> end;
>
>
> Is there any alternate way of achieving this? Passing multiple
records
> to a function im creating a temp table before invoking the function.
> For receiving an output of multiple rows i'm creating a temp
table to
> reuse further in the code.
>
> Can this be done using Refcursor? Is it possible to convert
refcursor to
> a temp table and use it as normal table in query?
>
>
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx <mailto:adrian.klaver@xxxxxxxxxxx>
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
