PLSQL procedure error - plsql

Question

I get the below error while executing code
create or replace
function contact_restriction_function(obj_schema varchar2, obj_name varchar2)
return varchar2 is
v_contact_info_visible hr_user_access.contact_info_visible%type;
begin
-- Here you can put any business logic for filtering
select nvl(max(contact_info_visible),'N')
into v_contact_info_visible
from hr_user_access
where user_name = user;
-- SQL filter / policy predicate
return ''''||v_contact_info_visible||''' = ''Y'' ';
end;
/
after show erros command i got this
show errors
Errors for FUNCTION CONTACT_RESTRICTION:
LINE/COL ERROR
-------- -----------------------------------------------------------------
3/1 PLS-00103: Encountered the symbol "?" when expecting one of the
following:
begin function pragma procedure subtype type
current cursor delete
exists prior external language
This is the remaining code:
begin
dbms_rls.add_policy(object_schema => 'HR' ,
object_name => 'EMPLOYEES' ,
policy_name => 'Contact_Restriction_Policy' ,
policy_function => 'contact_restriction_function' ,
sec_relevant_cols=>'EMAIL,PHONE_NUMBER'Contact Info ,
sec_relevant_cols_opt=>dbms_rls.all_rows);
end;
below is the actual code which i am executing before show errors:
create or replace function contact_restriction(obj_schema varchar2, obj_name varchar2)
return varchar2
is
v_contact_info_visible IN user_access.contact_info_visible%type;
begin
select nvl(max(contact_info_visible),'N')
into v_contact_info_visible
from user_access where username = user;
return 'v_contact-info_visible ='|| 'Y';
end;

Answer 1

Your original question shows an error message referring to "?", but the code yout posted a as comment would raise a similar error for `"IN"' instead:
2/24 PLS-00103: Encountered the symbol "IN" when expecting one of the following:
That is because you've used IN for a local variable; but IN, OUT and IN OUT are only applicable to stored procedure parameters. You could have declared the function with an explicit IN for example, though it is the default anyway:
create or replace function contact_restriction(obj_schema IN varchar2, ...
So that needs to be removed from the v_contact_info_visible declaration. You've linked to an example you're working from, but you've removed a lot of important quotes from that, which will still cause it to fail when executed as a part of a VPD; because v_contact_info_visible will be out of scope to the caller. And you have a typo, with a hyphen instead of an underscore.
You need something like:
create or replace function contact_restriction(obj_schema varchar2,
obj_name varchar2)
return varchar2 is
v_contact_info_visible user_access.contact_info_visible%type;
begin
select nvl(max(contact_info_visible),'N')
into v_contact_info_visible
from user_access
where username = user;
return ''''||v_contact_info_visible ||''' =''Y''';
end;
/
When called, that will return a string which is either 'N'='Y' or 'Y'='Y'. VPD will include that as a filter in the original query, which will either prevent any rows being returned (in the first case) or have no effect and allow all rows that match any other existing conditions to be returned (in the second case).

Answer 2

The syntax of the function header is incorrect. It should be:
create or replace function contact_restriction(obj_schema IN varchar2, obj_name IN varchar2)
return varchar2
is