PostgreSQL: How to pass parameters from command line?

Question

I have a somewhat detailed query in a script that uses ? placeholders. I wanted to test this same query directly from the psql command line (outside the script

Answer 1

I've ended up using a better version of @vol7ron answer:

DO $$
BEGIN
    IF NOT EXISTS(SELECT 1 FROM pg_prepared_statements WHERE name = 'foo') THEN
        PREPARE foo(text,text,text) AS
            SELECT  * 
            FROM    foobar
            WHERE   foo = $1
                AND bar = $2
                OR  baz = $3;
    END IF;
END$$;
EXECUTE foo('foo','bar','baz');

This way you can always execute it in this order (the query prepared only if it does not prepared yet), repeat the execution and get the result from the last query.