Skip to Main Content
Oracle PL/SQL for DBAs
book

Oracle PL/SQL for DBAs

by Arup Nanda, Steven Feuerstein
October 2005
Intermediate to advanced content levelIntermediate to advanced
454 pages
14h 44m
English
O'Reilly Media, Inc.
Content preview from Oracle PL/SQL for DBAs

Finding Genuine Repeats

Finding genuine repeats is straightforward. If the order type matches the repeat type of a criteria record, and if a corresponding match is found in the associative array containing potential repeats, then we have found a genuine repeat. I’ve put this code into a sub-function, as well.

    /*------------------------------------------------------------------*/
    FUNCTION order_is_a_repeat ( p_location_id NUMBER,
                                 p_type_id     NUMBER,
                                 p_date        DATE )
             RETURN NUMBER IS
    /*------------------------------------------------------------------*/
      v_hash NUMBER;
    BEGIN

      -- for every criteria...
      FOR counter IN 1..v_criteria.LAST LOOP

        -- if order type matches the repeat order type of a criteria
        IF v_criteria(counter).repeat_type_id = p_type_id THEN

          -- calculate a hash of the location, first and repeat order types
          v_hash := DBMS_UTILITY.GET_HASH_VALUE(p_location_id || ':' ||
                            v_criteria(counter).first_type_id || ':' ||
                            v_criteria(counter).repeat_type_id,
                            -32767,65533);

          -- if logged as a potential repeat then its safe to assume
          -- we are repeating now
          IF v_potential_repeat.EXISTS(v_hash) THEN
            RETURN(v_hash);
          END IF;

        END IF;  -- order type match

      END LOOP;  -- every criteria

      RETURN(NULL);

    END order_is_a_repeat;

The algorithm is as follows. For every criterion for the region:

  • Does the order type of the order being processed match the repeat-order type of the criterion? If yes, then carry on.

  • Manufacture a hash value based on the location of the order, the first order type of the criterion, and ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Oracle PL/SQL Best Practices

Oracle PL/SQL Best Practices

Steven Feuerstein
Expert Oracle PL/SQL

Expert Oracle PL/SQL

Ron Hardman, Michael McLaughlin
Oracle PL/SQL For Dummies

Oracle PL/SQL For Dummies

Michael Rosenblum, Paul Dorsey

Publisher Resources

ISBN: 0596005873Supplemental ContentErrata Page