Oracle sql to pgsql with table() function issue - sql

Question

I am doing the migration from Oracle to pgsql and I've the the oracle sql like below:
select code,product_no,qty qty from t_ma_tb_inventory
where code is not null and status=2
and update_type in (select * from table(splitstr(:types,',')))
and tb_shop_id=:shopId
order by update_time
and the splitstr function like below:
CREATE OR REPLACE FUNCTION splitstr (p_string text, p_delimiter text) RETURNS SETOF STR_SPLIT AS $body$
DECLARE
v_length bigint := LENGTH(p_string);
v_start bigint := 1;
v_index bigint;
BEGIN
WHILE(v_start <= v_length)
LOOP
v_index := INSTR(p_string, p_delimiter, v_start);
IF v_index = 0
THEN
RETURN NEXT SUBSTR(p_string, v_start);
v_start := v_length + 1;
ELSE
RETURN NEXT SUBSTR(p_string, v_start, v_index - v_start);
v_start := v_index + 1;
END IF;
END LOOP;
RETURN;
END
$body$
LANGUAGE PLPGSQL
SECURITY DEFINER
;
-- REVOKE ALL ON FUNCTION splitstr (p_string text, p_delimiter text) FROM PUBLIC;
can someone help me to write the equivalent code in pgsql?Thank you very much

Answer 1

You don't need to write your own function - Postgres already has a built-in function for that: string_to_array
select code, product_no, qty qty
from t_ma_tb_inventory
where code is not null and status=2
and update_type = any ( string_to_array(:types,',') )
and tb_shop_id = :shopId
order by update_time;
If you are passing a text, but you need to compare that to an integer, you need to cast the resulting array:
select code, product_no, qty qty
from t_ma_tb_inventory
where code is not null and status=2
and update_type = any ( string_to_array(:types,',')::int[] )
and tb_shop_id = :shopId
order by update_time;
However: that is a pretty ugly workaround that is only necessary in Oracle because it has no support for real arrays in SQL (only in PL/SQL).
In Postgres it would be much better to pass an array of integers directly (e.g. make :types an int[]). Then no parsing or casting would be necessary:
select code, product_no, qty qty
from t_ma_tb_inventory
where code is not null and status=2
and update_type = any ( :types )
and tb_shop_id = :shopId
order by update_time;