为什么我给表添加了一个insert监听触发器后，在新插入一跳数据的时候，提示未找到任何数据

CREATE OR REPLACE TRIGGER trig_toms_demo
AFTER INSERT OR UPDATE OR DELETE ON gxjhxm
FOR EACH ROW

DECLARE
PRAGMA AUTONOMOUS_TRANSACTION;
ht_htbh ht.htbh%type;

BEGIN

IF INSERTING THEN
                 SELECT  count(*) INTO ht_htbh FROM gxjyk.ht;
     END IF;

END;

求大神解惑