Need help in this query

Question

Dear all,
I am quite a beginner and assigned a critical task, here is the table contents and below is the function.
function returns the access permission(M or V) of user, the task here is if user is already
defined in the table it gets the access flag value. But my problem here is if it is not defined
in the table it should get department accessflag without any explicit initialization in the function.
SQL> SELECT * FROM PACS;
BRANCH     DEPT       ACCESSFLAG USERID
HO         FIN        M        NANDA
HO         FIN        M        RAVI
HO         FIN        V
HO         MKT        M        GOPAL
HO         MKT        M        KISHORE
HO         MKT        V
HO         FOC        M           SAILESH
HO         FOC        V
Create Or Replace
Function GetAccessFlag(IBranch In VarChar2,
                 IDept In VarChar2,
                 IUserId In VarChar2)
Return Varchar2
Is
     LvAccess VarChar2(2);
Begin
     Begin
          Select AccessFlag
          Into LvAccess
          From Pacs
          Where (Branch = IBranch Or (IBranch Is Null))
          And   (Dept   = IDept Or (IDept is Null))
          And   (UserId = IUserId Or (IUserId Is Null));
     Exception
          When No_Data_Found Then
               Raise_Application_Error(-20001, 'No Acess permissions defined');               
          When Others Then
               Raise_Application_Error(-20002, 'Other Error - '||SqlErrM);
     End;
     Return     (LvAccess);
End GetAccessFlag;thank you very much in advance.

Answer 1

I prepared small example for you:
<pre>
[email protected]> create table pacs(
2 branch char(2) not null,
3 dept char(3) not null,
4 accessflag char(1) not null,
5 userid varchar2(10)
6 )
7 /
Table created.
[email protected]> insert into pacs values('HO','FIN','M','NANDA');
1 row created.
[email protected]> insert into pacs values('HO','FIN','M','RAVI');
1 row created.
[email protected]> insert into pacs values('HO','FIN','V',null);
1 row created.
[email protected]> insert into pacs values('HO','MKT','M','GOPAL');
1 row created.
[email protected]> insert into pacs values('HO','MKT','M','KISHORE');
1 row created.
[email protected]> insert into pacs values('HO','MKT','V',NULL);
1 row created.
[email protected]> insert into pacs values('HO','FOC','M','SAILESH');
1 row created.
[email protected]> insert into pacs values('HO','FOC','V',NULL);
1 row created.
[email protected]> commit;
Commit complete.
[email protected]> create or replace function getAccessFlag(p_Branch char,p_Dept char,
2 p_Username varchar2)
3 return char
4 is
5 no_data_for_user exception;
6 v_result char;
7
8 function checkAccess(p_B char, p_D char, p_U varchar2)
9 return char is
10 v_access char;
11 function checkUserAccess(p_B char, p_D char, p_U varchar2)
12 return char is
13 v_access char;
14 begin
15 select accessflag
16 into v_access
17 from pacs
18 where branch = p_B and dept = p_D and userid = p_U;
19 return v_access;
20 exception
21 when no_data_found then
22 raise no_data_for_user;
23 end;
24 begin
25 v_access := checkUserAccess(p_B, p_D, p_U);
26 return v_access;
27 exception
28 when no_data_for_user then
29 select accessflag
30 into v_access
31 from pacs
32 where branch = p_B and dept = p_D and userid is null;
33 return v_access;
34 end;
35 begin
36 v_result := checkAccess(p_Branch, p_Dept, p_Username);
37 return v_result;
38 exception
39 when no_data_found then
40 raise_application_error(-20001,'No data for user and department');
41 end;
42 /
Function created.
[email protected]> select getAccessFlag('HO','FU','Krystian') from dual;
select getAccessFlag('HO','FU','Krystian') from dual
ERROR at line 1:
ORA-20001: No data for user and department
ORA-06512: at "MOB.GETACCESSFLAG", line 40
[email protected]> select getAccessFlag('HO','FIN','Krystian') from dual;
GETACCESSFLAG('HO','FIN','KRYSTIAN')
V
[email protected]> select getAccessFlag('HO','FIN','NANDA') from dual;
GETACCESSFLAG('HO','FIN','NANDA')
M
[email protected]>
</pre>
Best Regards
Krystian Zieja / mob