Dear List,
First off, this is kind of long, so don't start reading unless you have
some time. :)
I've run into this before, and now I can't remember how to resolve it.
( database is 8.1.7.0 )
The Signature of a procedure or function is made up of:
1. function or procedure name
2. data types of arguments
3. mode of arguments ( IN, OUT, IN OUT )
4. return value in the case of a function
There are some other special cases, but this is enough for this discussion.
The documentataion is quite clear on one thing; changing the name of an
argument will *not* change the signature.
Here's some code to demonstrate
==========================
create or replace package ftest
is
function login(
username_in varchar2
, password_in varchar2
) return boolean;
function login(
username_in varchar2
, password_in varchar2
) return varchar2;
end;
/
show errors package ftest
create or replace package body ftest
is
function login(
username_in varchar2
, password_in varchar2
) return boolean
is
begin
return true;
end;
function login(
username_in varchar2
, password_in varchar2
) return varchar2
is
login_success boolean := false;
begin
login_success := login(
username_in
, password_in
);
if login_success then
return 'LOGIN';
else
return 'NOLOGIN';
end if;
end;
end;
/
show errors package body ftest
===========================
Try to compile this and you will get :
Errors for PACKAGE BODY FTEST:
LINE/COL
---------------------------------------------------------------------------------
ERROR
----------------------------------------------------------------------------------------------------
21/3
PL/SQL: Statement ignored
21/21
PLS-00307: too many declarations of 'LOGIN' match this call
The signatures of these two function are different: one returns a boolean
and the other returns a varchar. The login() function that returns a
varchar
should be able to call a function of the same name and arguments that
returns a boolean. But it doesn't work.
The code below does work. Notice the two changes. The login() function
that returns a boolean now has a prefix of 'b_' on it's input arguments.
The login() function that returns a varchar now uses named parameters to
call the login() function that returns a boolean.
Both of these changes are necessary to make this work.
Any ideas?
Thanks
Jared
====================================================
create or replace package ftest
is
function login(
b_username_in varchar2
, b_password_in varchar2
) return boolean;
function login(
username_in varchar2
, password_in varchar2
) return varchar2;
end;
/
show errors package ftest
create or replace package body ftest
is
function login(
b_username_in varchar2
, b_password_in varchar2
) return boolean
is
begin
return true;
end;
function login(
username_in varchar2
, password_in varchar2
) return varchar2
is
login_success boolean := false;
begin
login_success := login(
b_username_in => username_in
, b_password_in => password_in
);
if login_success then
return 'LOGIN';
else
return 'NOLOGIN';
end if;
end;
end;
/
show errors package body ftest
====================================
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