How to use the date range in PostgreSQL stored function? - node.js

Question

I am new to SQL. I am using PostgreSQL. I have created the stored function called report:
CREATE OR REPLACE FUNCTION report(sensors VARCHAR,fromdate DATE,todate DATE)
RETURNS TABLE (
sensor VARCHAR,
id INT,
value INT,
created_date DATE
)
AS $$
DECLARE
var_r record;
BEGIN
FOR var_r IN(SELECT
*
FROM probe_data
WHERE probe_data.sensor =sensors AND probe_data.created_date >= fromdate AND probe_data.created_date <= todate )
LOOP
sensor := var_r.sensor ;
id := var_r.id;
created_date := var_r.created_date;
value:= var_r.value;
RETURN NEXT;
END LOOP;
END;
I want to get the data's between two date ranges.When I execute in SQL tool, it returns my desired output. But when I call the function
let sql= `select * from public.report($1,$2,$3);`
let values=[req.body.sensors,req.body.fromdates,req.body.todates];
from my nodejs program, I am getting the data's out of range.
Here is my screen shot:
This is the structure of my return table
As you can see,In my second screen shot, I'm getting the data out of range. I don't where I am doing wrong.

Answer 1

Your parameter is declared as DATE but you are trying to pass a timestamp. So Postgres will cast the passed value to a date and you lose the time information. You need to define the parameter as timestamp if you want it to be treated as one. The return type of created_at should probably be a timestamp as well.
You can also get rid of the CURSOR loop and PL/pgSQL as well:
CREATE OR REPLACE FUNCTION report(sensors VARCHAR, fromdate timestamp, todate timestamp)
RETURNS TABLE (sensor VARCHAR, id INT, value INT, created_date timestamp)
AS $$
select pb.sensor, pb.id, pb.value, pg.created_date
FROM probe_data
WHERE pb.sensor = sensors
AND pb.created_date >= fromdate
AND pb.created_date <= todate;
$$
language sql;