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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

Passing Objects Instead Of Cursors

It’s a little-known fact that table functions can accept collections as well as cursors as parameters . Here’s a simple example.

    CREATE OR REPLACE FUNCTION give_me_a_collection ( p_col number_t )
                      RETURN number_t IS
      v_ret_val number_t := number_t(  );
    BEGIN
      v_ret_val.EXTEND(p_col.COUNT);
      FOR counter IN v_ret_val.FIRST..v_ret_val.LAST LOOP
        v_ret_val(counter) := p_col(counter);
      END LOOP;
      RETURN(v_ret_val);
    END;

And here’s one way to execute it in a SELECT.

    SQL> SELECT *
      2    FROM TABLE(give_me_a_collection(number_t(1,2,3)));

    COLUMN_VALUE
    ------------
               1
               2
               3
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Publisher Resources

ISBN: 0596005873Supplemental ContentErrata Page