Overloading function

Hi all
create or replace package emp_pack is
function p1 (p_tvia_num movil.tvia_num%type,
p_chaluka_num movil.chaluka_num%type) return number ;
function p1 (p_tvianum movil.tvia_num%type,
p_chlaukanum%type,
p_polisanum%type) return number ;
end emp_pack;i'm posting only the specification
now
i'm trying to invoke the function :
exec emp_pack.p1(p_tvia_num=>99,p_chaluka_num=>0);
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'P1
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored '
i know that if i declare different name for the parameters and invoking the function with the parameter name it's suppose to work ,
am i right ? or this valid only to procedures ?
Thanks in Advanced
Naama
Edited by: naama on Jun 12, 2011 2:47 AM

Hi peter
Sorry my mistake , i copied the wrong script
CREATE OR REPLACE PACKAGE emp_pack IS
FUNCTION p1 (
    p_tvia_num       movil.tvia_num%TYPE,
    p_chaluka_num    movil.chaluka_num%TYPE
    RETURN NUMBER;
FUNCTION p1 (
    p_tvianum       movil.tvia_num%TYPE,
    p_chlaukanum    movil.chaluka_num%TYPE,
    p_polisanum     movil.polisa_num%TYPE
    RETURN NUMBER;
end emp_pack;/
o.k you right , and i also did
var g_num
execute :g_num := emp_pack.p1(p_tvia_num=>99, p_chaluka_num=>0)
and it's work
now i was wondering
from the beginning i wanted to do like this :
CREATE OR REPLACE PACKAGE emp_pack IS
FUNCTION p1 (
    p_tvia_num       movil.tvia_num%TYPE,
    p_chaluka_num    movil.chaluka_num%TYPE
    RETURN NUMBER;
FUNCTION p1 (
    p_tvia_num       movil.tvia_num%TYPE,
    p_chlauka_num    movil.chaluka_num%TYPE,
    p_polisa_num     movil.polisa_num%TYPE
    RETURN NUMBER;
--overloading function no.3
FUNCTION p1 (
p_polisa_num     movil.polisa_num%TYPE ,
p_chlauka_num    movil.chaluka_num%TYPE) return number ;
end emp_pack;i added one more function which get also two parameters of the same data type ,
and also gave the parameters of all the p1 function the same name ,
is it valid and if so , it this a poor pl/sql code , ok is it o.k writing like this ?
Thanks in Advanced
Naama
Edited by: naama on Jun 12, 2011 3:35 AM
Edited by: naama on Jun 12, 2011 3:36 AM

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Message was edited by:
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/Originally, I had just the one function with VARCHAR2 arguments. This failed to work properly because when dates were passed in, the automatic conversion to VARCHAR2 was dropping the timestamp. So, I added a 2nd function with DATE arguments. Then I started getting "too many declarations of is_same exist" error when passing TIMESTAMPs. This made no sense to me, so even though Oracle's documentation says you cannot do it, I created a 3rd version of the function, to handle TIMESTAMPS explicitly. Surprisingly, it works fine. But then I noticed it didn't work with TIMESTAMP with TIME ZONEs. Hence, the fourth version of the function. Oracle's docs say that if your arguments are of the same type family, you cannot create an overloaded function, but as the example above shows, this is very wrong.
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Here is the apparently incorrect Oracle documentation on the matter: http://docs.oracle.com/cd/B12037_01/appdev.101/b10807/08_subs.htm (see overloading subprogram names), and here are the various types and their families: http://docs.oracle.com/cd/E11882_01/appdev.112/e17126/predefined.htm.
Edited by: hotwater on Jan 9, 2013 3:38 PM
Edited by: hotwater on Jan 9, 2013 3:46 PM

>
So, I added a 2nd function with DATE arguments. Then I started getting "too many declarations of is_same exist" error when passing TIMESTAMPs. This made no sense to me
>
That is because when you pass a TIMESTAMP Oracle cannot determine whether to implicitly convert it to VARCHAR2 and use your first function or implicitly convert it to DATE and use your second function. Hence the 'too many declarations' exist error.
>
, so even though Oracle's documentation says you cannot do it, I created a 3rd version of the function, to handle TIMESTAMPS explicitly. Surprisingly, it works fine. But then I noticed it didn't work with TIMESTAMP with TIME ZONEs.
>
Possibly because of another 'too many declarations' error? Because now there would be THREE possible implicit conversions that could be done.
>
Hence, the fourth version of the function. Oracle's docs say that if your arguments are of the same type family, you cannot create an overloaded function, but as the example above shows, this is very wrong.
>
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See the SQL Language doc
>
ANSI, DB2, and SQL/DS Datatypes
SQL statements that create tables and clusters can also use ANSI datatypes and datatypes from the IBM products SQL/DS and DB2. Oracle recognizes the ANSI or IBM datatype name that differs from the Oracle Database datatype name. It converts the datatype to the equivalent Oracle datatype, records the Oracle datatype as the name of the column datatype, and stores the column data in the Oracle datatype based on the conversions shown in the tables that follow.
INTEGER
INT
SMALLINT
NUMBER(38)
FLOAT (Note b)
DOUBLE PRECISION (Note c)
REAL (Note d)
FLOAT(126)
FLOAT(126)
FLOAT(63)

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