pl/sql 中带参数的过程

Question

Why this procedure after adding parameters is not working?

Answer 1

No need for IN OUT parameters; IN would suffice (because of PLS_00363: SYSDATE can't be used as an assignment target while calling the procedure).

As you're manipulating parameters' values, I declared local variables for that purpose.

Also, next_day won't work with 7 ; use day name (hence my alter session to set language to English so that I could use SUNDAY as day name).

(Didn't we already discuss that? Where did your previous question go? Right, here it is: Function Next_Day in pl/sql ; why did you create another account?)

When fixed:

SQL> CREATE OR REPLACE PROCEDURE liczba_niedziel (data_od  IN DATE,
  2                                               data_do  IN DATE)
  3  IS
  4     l_data_od  DATE;
  5     l_data_do  DATE;
  6     licznik    NUMBER := 0;
  7  BEGIN
  8     l_data_od := NEXT_DAY (data_od, 'SUNDAY');
  9     l_data_do := data_do;
 10
 11     WHILE l_data_od <= l_data_do
 12     LOOP
 13        l_data_od := l_data_od + 7;
 14        licznik := licznik + 1;
 15     END LOOP;
 16
 17     DBMS_OUTPUT.put_line (
 18        '...' || SYSDATE || ' - ' || l_data_do || '...' || licznik);
 19  END;
 20  /

Procedure created.

Testing:

SQL> ALTER SESSION SET nls_date_language = 'english';

Session altered.

SQL> EXEC liczba_niedziel(sysdate, date '2022-01-18');
...30.12.2021 - 18.01.2022...3

PL/SQL procedure successfully completed.

SQL>