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Oracle Tutorials - What Are Named Parameters

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(Continued from previous topic...)

What Are Named Parameters?

Named parameters are actual parameters specified not by position but by providing formal parameter names when calling the procedure or function. The main advantage of named parameters is that the caller don't have to remember the position of each parameter. But the caller have to remember the formal parameter names. The script below illustrates how to use named parameters:

SQL> CREATE OR REPLACE PROCEDURE SWAP_TEST AS
  2    A NUMBER := 3;
  3    B NUMBER := 8;
  4    PROCEDURE MY_SWAP(X IN OUT NUMBER,Y IN OUT NUMBER) AS
  5      T NUMBER;
  6    BEGIN
  7      T := X;
  8      X := Y;
  9      Y := T;
 10    END MY_SWAP;
 11  BEGIN
 12    MY_SWAP(Y=>B, X=>A); -- same as (X=>A, Y=B), OR (A,B)
 13    DBMS_OUTPUT.PUT_LINE('A = ' || TO_CHAR(A));
 14    DBMS_OUTPUT.PUT_LINE('B = ' || TO_CHAR(B));
 15  END;
 16  /

SQL> EXECUTE SWAP_TEST;
A = 8
B = 3

(Continued on next topic...)

  1. What Is a Procedure?
  2. What Is a Function?
  3. How To Define an Anonymous Procedure without Variables?
  4. How To Define an Anonymous Procedure with Variables?
  5. How To Create a Stored Procedure?
  6. How To Execute a Stored Procedure?
  7. How To Drop a Stored Procedure?
  8. How To Pass Parameters to Procedures?
  9. How To Create a Stored Function?
  10. How To Call a Stored Function?
  11. How To Drop a Stored Function?
  12. How To Call a Stored Function with Parameters?
  13. How To Define a Sub Procedure?
  14. How To Call a Sub Procedure?
  15. How To Define a Sub Function?
  16. Can Sub Procedure/Function Be Called Recursively?
  17. What Happens If Recursive Calls Get Out of Control?
  18. What Is the Order of Defining Local Variables and Sub Procedures/Functions?
  19. What Is the Difference between Formal Parameters and Actual Parameters?
  20. What Are the Parameter Modes Supported by PL/SQL?
  21. How To Use "IN" Parameter Properly?
  22. How To Use "OUT" Parameter Properly?
  23. How To Use "IN OUT" Parameter Properly?
  24. How To Define Default Values for Formal Parameters?
  25. What Are Named Parameters?
  26. What Is the Scope of a Local Variable?

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