sql - 使用游标多次更新 pgsql

Question

这段代码没有错误，但没有任何数据变化，请帮助我。我想从一些库存表中多次更新数量

drop FUNCTION SP_PROSES_STOCK(noresep bigint, p_post_cd varchar);
CREATE or replace FUNCTION SP_PROSES_STOCK(noresep bigint, p_post_cd varchar)
RETURNS void
LANGUAGE plpgsql
as $function$
DECLARE cursorData refcursor;
    v_item_cd varchar;
    v_quantity numeric;

begin

open cursorData FOR
select A.item_cd, A.quantity from trx_medical_resep B
inner join trx_resep_data A on A.medical_resep_seqno = B.medical_resep_seqno
where B.medical_resep_seqno = noresep; 
fetch next from cursorData into v_item_cd,v_quantity;
while (found)
loop
    update inv_pos_item set quantity = quantity - v_quantity 
    where item_cd = v_item_cd and pos_cd = p_post_cd;
end loop;
close cursorData;

END 
$function$

Answer 1

我修改了您的函数以使其更短并使用 FOR。我还添加了 RAISE NOTICE 用于调试。你能试试吗:

CREATE or replace FUNCTION SP_PROSES_STOCK(noresep bigint, p_post_cd varchar)
RETURNS void
LANGUAGE plpgsql
as $function$
DECLARE v_cursor record;

BEGIN

   FOR v_cursor IN
       SELECT A.item_cd,
              A.quantity
         FROM trx_medical_resep B
         JOIN trx_resep_data A ON A.medical_resep_seqno = B.medical_resep_seqno
        WHERE B.medical_resep_seqno = noresep
   LOOP
       RAISE NOTICE 'Changes for %', v_curosr; 
       UPDATE inv_pos_item
           SET quantity = quantity - v_cursor.quantity 
         WHERE item_cd = v_cursor.item_cd
           AND pos_cd = p_post_cd;
   END LOOP;
END 
$function$

调试后，您可以删除 RAISE NOTICE。