Self-managing PostgreSQL partition tables

Question

I am trying to make a self-managing partition table setup with Postgres. It all revolves around this function but I can\'t seem to get Postgres to accept my table names. Any

Answer 1

I figured out the entirety and it works great, even have an auto-delete after 30 days. I hope this helps out future people looking for an autopartition trigger function.

CREATE FUNCTION ping_partition() RETURNS trigger
    LANGUAGE plpgsql
    AS $_$
DECLARE
_keepdate text;
_tablename text;
_startdate text;
_enddate text;
_result record;
BEGIN
_keepdate:=to_char(to_timestamp(NEW.date) - interval '30 days', 'YYYY-MM-DD');
_startdate := to_char(to_timestamp(NEW.date), 'YYYY-MM-DD');
_tablename:='pings_'||NEW.id||'_'||_startdate;
PERFORM 1
FROM   pg_catalog.pg_class c
JOIN   pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE  c.relkind = 'r'
AND    c.relname = _tablename
AND    n.nspname = 'pinglog';
IF NOT FOUND THEN
    _enddate:=_startdate::timestamp + INTERVAL '1 day';
    EXECUTE 'CREATE TABLE pinglog.' || quote_ident(_tablename) || ' (
        CHECK ( date >= EXTRACT(EPOCH FROM DATE ' || quote_literal(_startdate) || ')
            AND date < EXTRACT(EPOCH FROM DATE ' || quote_literal(_enddate) || ')
            AND id = ' || quote_literal(NEW.id) || '
        )
    ) INHERITS (pinglog.pings)';
    EXECUTE 'CREATE INDEX ' || quote_ident(_tablename||'_indx1') || ' ON pinglog.' || quote_ident(_tablename) || ' USING btree (microseconds) WHERE microseconds IS NULL';
    EXECUTE 'CREATE INDEX ' || quote_ident(_tablename||'_indx2') || ' ON pinglog.' || quote_ident(_tablename) || ' USING btree (date, id)';
    EXECUTE 'CREATE INDEX ' || quote_ident(_tablename||'_indx3') || ' ON pinglog.' || quote_ident(_tablename) || ' USING btree (date, id, microseconds) WHERE microseconds IS NULL';
END IF;
EXECUTE 'INSERT INTO ' || quote_ident(_tablename) || ' VALUES ($1.*)' USING NEW;
FOR _result IN SELECT * FROM pg_tables WHERE schemaname='pinglog' LOOP
    IF char_length(substring(_result.tablename from '[0-9-]*$')) <> 0 AND (to_timestamp(NEW.date) - interval '30 days') > to_timestamp(substring(_result.tablename from '[0-9-]*$'),'YYYY-MM-DD') THEN
        -- RAISE EXCEPTION 'timestamp=%,table=%,found=%',to_timestamp(substring(_result.tablename from '[0-9-]*$'),'YYYY-MM-DD'),_result.tablename,char_length(substring(_result.tablename from '[0-9-]*$'));
        -- could have it check for non-existant ids as well, or for archive bit and only delete if the archive bit is not set
        EXECUTE 'DROP TABLE ' || quote_ident(_result.tablename);
    END IF;
END LOOP;
RETURN NULL;
END;
$_$;