Question

我写了一个PL / SQL函数，它按员工ID更新工资，并将秒表作为INTERVAL DAY TO SECOND返回。

当被叫时，它会更新薪水，但我也希望它打印出秒表值。如何实现？我已经尝试添加此行dbms_output.put_line(stopwatch);，但该功能仍然只是更新工资，并且不会打印出秒表值。

CREATE OR REPLACE function myfunction1(e_empno_in IN NUMBER, e_sal_in IN NUMBER)

RETURN INTERVAL DAY TO SECOND
IS 
e_empno emp.empno%TYPE := e_empno_in;
e_sal emp.sal%TYPE := e_sal_in;

thestart TIMESTAMP;
stopwatch INTERVAL DAY TO SECOND;

BEGIN
    SELECT current_timestamp INTO thestart FROM dual;
    UPDATE emp SET sal = e_sal WHERE empno = e_empno;
    IF SQL%ROWCOUNT = 0 THEN
        raise_application_error (-10001, 'No row found for id ' || e_empno);
    END IF;
    SELECT current_timestamp-thestart INTO stopwatch FROM dual;
RETURN stopwatch;
dbms_output.put_line(stopwatch); --> *trying to print out stopwatch value*

END;

调用该函数：

BEGIN
dbms_output.put_line(myfunction1(7654, 2559));
END;

Answer 1

您需要DBMS_OUTPUT.PUT_LINE语句之前的RETURN。您也不需要使用SQL来获取当前时间（可以在PL / SQL中完成），并且您不需要重新分配输入参数以将它们用作绑定变量。

CREATE function myfunction1(
  e_empno_in IN emp.empno%TYPE,
  e_sal_in   IN emp.sal%TYPE
)
RETURN INTERVAL DAY TO SECOND
IS 
  thestart  TIMESTAMP := CURRENT_TIMESTAMP;
  stopwatch INTERVAL DAY TO SECOND;
BEGIN
  UPDATE emp
  SET   sal   = e_sal_in
  WHERE empno = e_empno_in;

  IF SQL%ROWCOUNT = 0 THEN
      raise_application_error (-10001, 'No row found for id ' || e_empno_in );
  END IF;

  stopwatch := CURRENT_TIMESTAMP - thestart;

  DBMS_OUTPUT.PUT_LINE(stopwatch);

  RETURN stopwatch;
END;
/

Oracle PL / SQL函数返回的值不会打印出来

1 个答案: