overloading a DATE with time STAMP function to avoid the "too many declarations.

CREATE OR REPLACE PACKAGE util
AS
  FUNCTION yn (bool IN BOOLEAN)
    RETURN CHAR;

  FUNCTION is_same(a varchar2, b varchar2)
    RETURN BOOLEAN;

  FUNCTION is_same(a date, b date)
    RETURN BOOLEAN;

  /* Oracle's documentation says that you cannot overload subprograms
   * that have the same type family for the arguments.  But, 
   * apparently timestamp and date are in different type families,
   * even though Oracle's documentation says they are in the same one.
   * If we don't create a specific overloaded function for timestamp,
   * and for timestamp with time zone, we get "too many declarations 
   * of is_same match" when we try to call is_same for timestamps.
   */
  FUNCTION is_same(a timestamp, b timestamp)
    RETURN BOOLEAN;

  FUNCTION is_same(a timestamp with time zone, b timestamp with time zone)
    RETURN BOOLEAN;

  /* These two do indeed cause problems, although there are no errors when we compile the package.  Why no errors here? */
  FUNCTION is_same(a integer, b integer) return boolean;

  FUNCTION is_same(a real, b real) return boolean;

END util;
/

CREATE OR REPLACE PACKAGE BODY util
AS
  /********************************************************************************
     NAME: yn
     PURPOSE: pass in a boolean, get back a Y or N
  ********************************************************************************/
  FUNCTION yn (bool IN BOOLEAN)
    RETURN CHAR
  IS
  BEGIN
    IF bool
    THEN
      RETURN 'Y';
    END IF;

    RETURN 'N';
  END yn;

  /********************************************************************************
     NAME: is_same
     PURPOSE: pass in two values, get back a boolean indicating whether they are
              the same.  Two nulls = true with this function.
  ********************************************************************************/
  FUNCTION is_same(a in varchar2, b in varchar2)
    RETURN BOOLEAN
  IS
    bool boolean := false;
  BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
  END is_same;

  FUNCTION is_same(a in date, b in date)
    RETURN BOOLEAN
  IS
    bool boolean := false;
  BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
  END is_same;
  
  FUNCTION is_same(a in timestamp, b in timestamp)
    RETURN BOOLEAN
  IS
    bool boolean := false;
  BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
  END is_same;

  FUNCTION is_same(a in timestamp with time zone, b in timestamp with time zone)
    RETURN BOOLEAN
  IS
    bool boolean := false;
  BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
  END is_same;

  /* Don't bother to fully implement these two, as they'll just cause errors at run time anyway */
  FUNCTION is_same(a integer, b integer) return boolean is begin return false; end;
  FUNCTION is_same(a real, b real) return boolean is begin return false; end;
  
END util;
/

declare
 d1 date := timestamp '2011-02-15 13:14:15';
 d2 date;
 t timestamp := timestamp '2011-02-15 13:14:15';
 t2 timestamp;
 a varchar2(10);
 n real := 1;
 n2 real;
begin
 dbms_output.put_line('dates');
 dbms_output.put_line(util.yn(util.is_same(d2,d2) ));
 dbms_output.put_line(util.yn(util.is_same(d1,d2) ));
 dbms_output.put_line('timestamps'); -- why don't these throw exception?
 dbms_output.put_line(util.yn(util.is_same(t2,t2) ));
 dbms_output.put_line(util.yn(util.is_same(t,t2) ));
 dbms_output.put_line('varchars');
 dbms_output.put_line(util.yn(util.is_same(a,a)));
 dbms_output.put_line(util.yn(util.is_same(a,'a')));
 dbms_output.put_line('numbers');
 -- dbms_output.put_line(util.yn(util.is_same(n,n2))); -- this would throw an exception
end;
/

Originally, I had just the a function with the arguments of VARCHAR2. It worked not correctly because when the dates were gone, the automatic conversion into VARCHAR2 lowered the timestamp. So, I added a 2nd function with the arguments to DATE. Then I started to get "too many declarations of is_same exist" error during the passage of time stamps. This made no sense to me, so, although documentation Oracle says you can't do this, I created a 3rd version of the function, to manage the TIMESTAMPS explicitly. Surprisingly, it works fine. But then I noticed that he did not work with TIMESTAMP with time zones. Therefore, the fourth version of the function. Docs of the Oracle say that if your arguments are of the same family, you can't create an overloaded function, but in the example above shows, it's very bad.

Finally, just for grins, I created the functions of number two, one number, the other with REAL and even these are allowed - they are compiled. But then, at runtime, it fails. I'm really confused.

Here's the apparently erroneous Oracle documentation on this subject: http://docs.oracle.com/cd/B12037_01/appdev.101/b10807/08_subs.htm (see overload subprogram names) and here are the different types and their families: http://docs.oracle.com/cd/E11882_01/appdev.112/e17126/predefined.htm.

Published by: hot water on 9 January 2013 15:38

Published by: hot water on 9 January 2013 15:46

>
So, I added a 2nd function with the arguments to DATE. Then I started to get "too many declarations of is_same exist" error during the passage of time stamps. It makes no sense for me
>
This is because when you pass a TIMESTAMP Oracle cannot determine whether to implicitly convert to VARCHAR2 and use your first function or implicitly convert to DATE and use your second function. Where the "too many declarations" error exist.
>
, even if said Oracle documentation you can not do, so I created a 3rd version of the function to manage the TIMESTAMPS explicitly. Surprisingly, it works fine. But then I noticed that he did not work with TIMESTAMP with time zones.
>
Perhaps due to another error "too many declarations? Because now, there will be THREE possible implicit conversions that might be made.
>
Therefore, the fourth version of the function. Docs of the Oracle say that if your arguments are of the same family, you can't create an overloaded function, but in the example above shows, it's very bad.
>
I think that the documentation, of the family of 'date', is wrong as you suggest. For WHOLE and REAL, the problem is that those are the ANSI data types and are really the same Oracle data type; they are more like "alias" that different data types.

See the doc of SQL language
>
ANSI SQL/DS and DB2 data types

The SQL statements that create tables and clusters allows also ANSI data types and products IBM SQL/DS and DB2 data types. Oracle recognizes the ANSI or IBM data type name that differs from the Oracle database data type name. It converts the data type for the equivalent Oracle data type, stores the Oracle data type under the name of the column data type and stores the data in the column in the data type Oracle based on the conversions listed in the following tables.

INTEGER NUMBER

INT

SMALLINT
NUMBER (38)

FLOAT (Note b)

DOUBLE-PRECISION (Note c)

REAL (Note d)
FLOAT (126)

FLOAT (126)

FLOAT (63)

Tags: Database

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/

create or replace package body pkg_overload
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  procedure overload(p_in in date)
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  begin
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ORA-06550: line 1, column 7:
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06550. 00000 -  "line %s, column %s:\n%s"
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*Action:

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-----
http://www.talkapex.com
http://www.clarifit.com

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SQL> ed
Wrote file afiedt.buf

  1  create or replace package pkg_overload
  2  as
  3    procedure overload(p_in in date);
  4    procedure overload(p_in in timestamp);
  5    procedure overload(p_in in timestamp with time zone);
  6    procedure overload(p_in in timestamp with local time zone);
  7* end pkg_overload;
SQL> /

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SQL> ed
Wrote file afiedt.buf

  1  create or replace package body pkg_overload
  2  as
  3    procedure overload(p_in in date)
  4    as
  5    begin
  6      dbms_output.put_line('overload > date');
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 19    as
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 21      dbms_output.put_line('overload > timestamp with local time zone');
 22    end overload;
 23* end pkg_overload;
 24  /

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< pre >
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face-> Office (while exclaiming in despair "¿Dang, now how could I miss that?")

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