DB Link Query Error while writing Trigger Function - database

Question

I am using PSQL 9.6 and trying to write a TRIGGER. Now issue is I am facing the error in the following query and the terminal output isn't verbose enough to determine where I am going wrong with this query.
The Function goes like this:
CREATE OR REPLACE FUNCTION insert_dblink_func()
RETURNS trigger AS
$BODY$
BEGIN
perform dblink_exec("insert into Some_Table select * from dblink( 'host=SOMEPRODSERVER dbname=DBNAME user=USERNAME password=PASSWORD', 'select id,name,helpline,email,created_at,updated_at') as sourceTable (id integer,name character varying,helpline character varying,email character varying,created_at timestamp with time zone,updated_at timestamp with time zone) on conflict(id) do update set id=excluded.id,name=excluded.name,helpline=excluded.helpline,email=excluded.email,created_at=excluded.created_at,updated_at=excluded.updated_at");
perform dblink_disconnect();
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql;
The output I am getting while I execute this function is this
LINE 5: perform dblink_exec("insert into TABLENAME sel...
^
CREATE FUNCTION
So I am confused as to what the error could be.
TIA

Answer 1

I'm so confused, coz I've tried splitting your dblink query into small steps, and I see that there's some issues in the select syntax (+ using of double quotes instead of single quotes):
INSERT INTO
some_table
SELECT *
FROM DBLINK('host=SOMEPRODSERVER dbname=DBNAME user=USERNAME password=PASSWORD',
'SELECT id,name,helpline,email,created_at,updated_at') --<< here's not table with "FROM statement"
AS sourcetable (id INTEGER,
name CHARACTER VARYING,
helpline CHARACTER VARYING,
email CHARACTER VARYING,
created_at TIMESTAMP WITH TIME ZONE,
updated_at TIMESTAMP WITH TIME ZONE)
ON CONFLICT(id) DO UPDATE SET
id=excluded.id,
name=excluded.name,
helpline=excluded.helpline,
email=excluded.email,
created_at=excluded.created_at,
updated_at=excluded.updated_at
And, according to the description, it is not clear for what action this trigger should fire. Can you split your code into small steps and provide some more info? Here is a dbfiddle example, that you can improve with your data