Question

使用Postgres 9.3。是否可以插入函数的结果？

我试过了：

CREATE FUNCTION apply_func() RETURNS TRIGGER AS $$
DECLARE gwa char(9);
BEGIN
gwa:=(select gwa_calc(new.studid));
IF (SELECT noGrade_check(new.studid)) THEN
 RAISE NOTICE 'ACCEPTED: GRADES COMPLETE';
  IF (SELECT yrlvl_check(new.studid)) THEN 
    RAISE NOTICE 'ACCEPTED:YRLVL_CHECK';
     IF (SELECT fail_check1(new.studid, new.sch_name)) THEN
       RAISE NOTICE 'ACCEPTED:FAIL_CHECK';
         IF (SELECT semunit_check1(new.studid)) THEN
           RAISE NOTICE 'ACCEPTED:UNIT_CHECK';
             IF (SELECT gwa_check(new.studid, new.sch_name)) THEN
                RAISE NOTICE 'ACCEPTED:GWA_CHECK';
                INSERT INTO apply(studid, sch_name, gpa)
                VALUES (new.studid, new.sch_name, gwa);
                RETURN NEW;
             ELSE
               RAISE NOTICE 'DECLINED:GPA_CHECK';
                 RETURN NULL;
             END IF;
         ELSE
           RAISE NOTICE 'DECLINED:UNIT_CHECK';
             RETURN NULL;
         END IF;
     ELSE
       RAISE NOTICE 'DECLINED:FAIL_CHECK';
         RETURN NULL;
     END IF;
  ELSE 
    RAISE NOTICE 'DECLINED:YRLVL_CHECK';
      RETURN NULL;
  END IF;
ELSE
 RAISE NOTICE 'DECLINED: NULL GRADE EXISTS';
   RETURN NULL;
END IF;

END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER apply_trig
BEFORE INSERT ON apply
FOR EACH ROW EXECUTE PROCEDURE apply_func();

我希望在获得奖学金所需的所有其他要求后，自动插入new.studid，new.sch_name和函数gwa_calc(new.studid)的结果。

我该怎么做？

Answer 1

以各种方式简化您的代码：

CREATE FUNCTION apply_func()
  RETURNS trigger AS
$func$
BEGIN

IF NOT noGrade_check(NEW.studid) THEN
   RAISE NOTICE 'DECLINED: NULL GRADE EXISTS';
ELSIF NOT yrlvl_check(NEW.studid) THEN 
   RAISE NOTICE 'DECLINED:YRLVL_CHECK';
ELSIF NOT fail_check1(NEW.studid, new.sch_name) THEN
   RAISE NOTICE 'DECLINED:FAIL_CHECK';
ELSIF NOT semunit_check1(NEW.studid) THEN
   RAISE NOTICE 'DECLINED:UNIT_CHECK';
ELSIF NOT gwa_check(NEW.studid, NEW.sch_name) THEN
   RAISE NOTICE 'DECLINED:GPA_CHECK';
ELSE
   NEW.gpa := gwa_calc(NEW.studid);
   RETURN NEW;
END IF;

RETURN NULL;

END;
$func$ LANGUAGE plpgsql;

INSERT只要您RETURN NEW自动发生。不要复制它，这将导致无限循环。

我建议你颠倒测试的逻辑，这样你就可以简化并放弃所有的否定。如果您不需要所有这些通知，可以进一步简化。

插入函数的结果

1 个答案: