I have written this stored procedure in Oracle:
CREATE OR REPLACE FUNCTION GET_SOLVER_ID(username_in IN VARCHAR2)
RETURN NUMBER
IS
solver_id number(19);
system_user_id number(19);
BEGIN
SELECT id
INTO solver_id
FROM usr_solver
WHERE username = username_in;
select ID into system_user_id from USR_USER where USER_TYPE = 'X';
solver_id := nvl(solver_id, system_user_id);
RETURN(solver_id);
END;
When I call the function with username that doesn't exist in table usr_solver I get null for the result. I expect to get system_user_id instead.
It seems like the other select statement and nvl function in begin block didn't execute.
Could you help, I can't see the reason why...
Thanks,
mismas
This should do what you want
CREATE OR REPLACE FUNCTION GET_SOLVER_ID(
username_in IN VARCHAR2)
RETURN NUMBER
IS
some_id NUMBER(19);
BEGIN
BEGIN
SELECT id
INTO some_id
FROM usr_solver
WHERE username = username_in;
EXCEPTION
WHEN NO_DATA_FOUND THEN
SELECT ID
INTO some_id
FROM USR_USER
WHERE USER_TYPE = 'X';
END;
RETURN(some_id);
END;
Related
I try to create the function login that takes customer number(pnr) and password from same table. Its fine to create function but test crashes with following eror:
ORA-00904: "P_PASSWD": invalid identifier
create or replace function logga_in(
p_pnr bankkund.pnr%type,
p_passwd bankkund.passwd%type
)
return number
as
v_resultat number(1);
begin
select count(pnr) into v_resultat
from bankkund
where p_pnr = pnr
and p_passwd = passwd;
return 1;
exception
when no_data_found then
return 0;
end;
There is one other problem with your code not suggested in the comments, A count function from a select into will not raise a NO_DATA_FOUND exception. You may use an IF condition on count or do something like this, which is preferable
CREATE OR REPLACE FUNCTION logga_in (
p_pnr bankkund.pnr%TYPE,
p_passwd bankkund.passwd%TYPE
) RETURN NUMBER AS
v_resultat NUMBER(1);
BEGIN
SELECT 1 --do not use count if you wish to handle no_data_found
INTO v_resultat FROM
bankkund WHERE pnr = p_pnr AND
passwd = p_passwd
AND ROWNUM = 1; --Add this
RETURN 1;
EXCEPTION
WHEN no_data_found THEN
RETURN 0;
END;
Now, as far as calling the procedure is concerned, there are various options available including using bind variable
VARIABLE p_pnr number --use the datatype of bankkund.pnr%TYPE
VARIABLE p_passwd VARCHAR2(10) --use the datatype of bankkund.passwd
SELECT logga_in(:p_pnr,:p_passwd) FROM dual;
Or substitution variable
SELECT logga_in('&p_pnr','&p_passwd') FROM dual;
Give inputs when prompted.
Or use PL/SQL block
DECLARE
v_res INT;
v_pnr bankkund.pnr%type := 12892; --or appropriate value
p_passwd bankkund.passwd%type := some_passwd';
BEGIN
v_res := logga_in();
If v_res = 1 THEN
do_something_u_want; --call or execute appropriate action.
END IF;
END;
/
I have problem with my plsql code. It's just part of my whole job.
declare
id number(2):=1; (here is function which returns any value)
check VARCHAR2(100);
begin
select COUNT(*) into check from T_SDSN_LOG Where ANY_ID=id AND CHECK LIKE
'NAME';
dbms_output.put_line(check);
end;
In this case, my select returns 0 althought it should be 2.
If I change the part
Where ANY_ID=id to
Where ANY_ID=2 it works perfectly. Any advices? I need id to be variable as a return value from function.
This uses a locally defined function so it isn't available in the SQL but can be referenced in the PL/SQL.
DECLARE
lnum_id NUMBER := return_id;
lnum_check VARCHAR2(100);
FUNCTION return_id
RETURN NUMBER
IS
BEGIN
RETURN 123456;
END;
BEGIN
lnum_id := return_id;
SELECT COUNT(*)
INTO lnum_check
FROM my_table
WHERE table_id = lnum_id;
DBMS_OUTPUT.put_line(lnum_check);
END;
You will presumably want this functionality in a package in which case you can declare the function in the package header, write the code for the function in the body and then reference it in the SQL itself. So if I declare a function (FNC_RETURN_ID) in a package called PKG_DATA_CHECKS that returns a NUMBER I can do the following;
DECLARE
lnum_id NUMBER;
lnum_check VARCHAR2(100);
BEGIN
SELECT COUNT(*)
INTO lnum_check
FROM my_table
WHERE table_id = (SELECT pkg_data_checks.fnc_return_id FROM dual);
DBMS_OUTPUT.put_line(lnum_check);
END;
Please see my code below. If the parameter p_cust_id is not in the column cust_id I want "0" to be printed out (which means not logged in). If it is in cust_id I want oracle to continue the second part of the code (the part below the empty row).
I have tried to solve this by inserting the values of column cust_id in a cursor and then inserting it in the variable v_cust_id. Perhaps this results in unnecessarily much code?
My problem is that the program does not seem to run the second part even if p_cust_id is in cust_id. It just prints out "0" even though the customer ID and the password are correct.
Before I added the cursor the program worked as it was supposed to, unless the parameter p_cust_id didn't match any value in the cust_id column. If this was the case nothing was printed out.
create or replace function log_in(
p_cust_id in customer.cust_id%type,
p_passwd in customer.passwd%type)
return varchar2
as
cursor c_cust_id is select cust_id from customer;
v_cust_id customer.cust_id%type;
v_passwd customer.passwd%type;
v_logged_in number(1);
v_not_logged_in number(1);
begin
v_logged_in := 1;
v_not_logged_in := 0;
if not c_cust_id%isopen then
open c_cust_id;
end if;
loop
fetch c_cust_id
into v_cust_id;
exit when c_cust_id%notfound;
end loop;
if p_cust_id not in(v_cust_id) then
return v_not_logged_in;
end if;
close c_cust_id;
select passwd
into v_passwd
from customer
where cust_id = p_cust_id;
if v_passwd = p_passwd then
return v_logged_in;
else
return v_not_logged_in;
end if;
end;
I could see, you don't need a cursor at all, to check if the cust_id is in the table. Just search for the cust_id in the table, and attempt to fetch the password. If it exists, you get the value, and NO_DATA_FOUND exception otherwise which means not logged in.
BEGIN
select passwd
into v_passwd
from customer
where cust_id = p_cust_id;
EXCEPTION
WHEN NO_DATA_FOUND THEN
return v_not_logged_in;
END;
Full code will be:
create or replace function log_in(
p_cust_id in customer.cust_id%type,
p_passwd in customer.passwd%type)
return varchar2
as
v_cust_id customer.cust_id%type;
v_passwd customer.passwd%type;
v_logged_in number(1);
v_not_logged_in number(1);
begin
v_logged_in := 1;
v_not_logged_in := 0;
BEGIN
select passwd
into v_passwd
from customer
where cust_id = p_cust_id;
EXCEPTION
WHEN NO_DATA_FOUND THEN
return v_not_logged_in;
END;
if v_passwd = p_passwd then
return v_logged_in;
else
return v_not_logged_in;
end if;
end;
I have the following table:
T_TYPE_ID T_TYPE T_TYPE_PRICE T_TYPE_START_DATE T_TYPE_END_DATE
1 student 10.95 01.04.2015 00:00:00 30.06.2015 00:00:00
2 Concession 5.5 01.04.2015 00:00:00 30.06.2015 00:00:00
I need to:
Create FUNC_get_ t_type_end_date function
This function should contain the following input parameter: t_type_p and the following output parameters: t_type_price_p and t_type_end_date_p. It should return 1 if having a record with t_type as t_type_p otherwise return 0. In addition, in the case of having a record, it should assign the latest t_type_end_date to t_type_end_date_p and t_type_price to t_type_price_p. Please note that t_type_end_date_p can be null; it means that the associated price is currently valid.
I have written the following code:
CREATE OR REPLACE FUNCTION FUNC_get_t_type_end_date
( t_type_p IN VARCHAR2)
RETURN NUMBER
AS
cnum NUMBER;
CURSOR cr1 IS
SELECT t_type
FROM ticket_type
WHERE t_type = t_type_p;
BEGIN
OPEN cr1;
FETCH cr1 INTO cnum;
IF cr1%NOTFOUND THEN
cnum := 0;
END IF;
CLOSE cr1;
RETURN cnum;
END;
I did not get any clue on how to return multiple values from a function. I am using oracle.
Hint:
create or replace FUNCTION FUNC_get_ t_type_end_date (…)
return number
as
-- define a variable to return a number and assign 0 to it
-- define a cursor to obtain t_type_price, t_type_end_date of the given t_type_p. The t_type_end_date values should be sorted in descending order – to do so the first record will contain either null or the latest of t_type_end_date
BEGIN
-- open cursor
-- fetch the first record from the cursor to t_type_price_p and t_type_end_date_p
-- if (having a record) then …
-- close cursor
RETURN …
END;
It is not possible to return more than one variable from function. However, it is possible to return a customized variable (i.e. record) type that contains multiple values. To do this, you need first to define type contains the three variables you want to return as follows:
TYPE new_type is record(cnum number, t_type_end_date_p timestamp, t_type_price_p timestamp);
Then you can use it in your function as follows:
CREATE OR REPLACE FUNCTION FUNC_get_t_type_end_date ( t_type_p IN VARCHAR2)
RETURN new_type AS
new_type_variable newtype;
CURSOR cr1 IS
SELECT t_type
FROM ticket_type
WHERE t_type = t_type_p;
BEGIN
OPEN cr1;
FETCH cr1 INTO cnum;
IF cr1%NOTFOUND THEN
SELECT 0, null, null into new_type_variable from dual;
ELSE
SELECT 1, cr1.t_type_end_date, cr1.t_type_price into new_type_variable from dual;
END IF;
CLOSE cr1;
RETURN new_type_variable ;
END;
Try this:
create or replace function func_get_t_type_end_date(t_type_p in varchar2, t_type_price_p out number, t_type_end_date_p out date) return number
as
cnum NUMBER;
CURSOR cr1 IS
SELECT t_type_price,t_type_end_date
FROM ticket_type t
WHERE t_type = t_type_p
and not exists (select 1
from ticket_type t2
where t2.t_type = t.t_type
and t2.t_type_end_date>t.t_type_end_date);
BEGIN
OPEN cr1;
FETCH cr1 INTO t_type_price_p,t_type_end_date_p;
IF cr1%NOTFOUND THEN
cnum := 0;
else
cnum := 1;
END IF;
CLOSE cr1;
RETURN cnum; end;
Example of using:
set serveroutput on
declare
v_result number;
v_type_price_p number;
v_type_end_date_p date;
begin
v_result:=func_get_t_type_end_date(t_type_p=>'student',t_type_price_p=>v_type_price_p,t_type_end_date_p=>v_type_end_date_p);
dbms_output.put_line('Result: '||v_result);
dbms_output.put_line('Price: '||v_type_price_p);
dbms_output.put_line('End date: '||v_type_end_date_p);
end;
/
I'd like to know how can I return multiple values with my PL/SQL in record type.
Below is my example code :-
CREATE OR REPLACE FUNCTION "FN_TESTING"
(
TESTING1 IN VARCHAR2
) RETURN TEST4_TEST as
TEST2 TEST4_TEST%ROWTYPE;
CURSOR TEST1 IS
SELECT '1','2' FROM DUAL;
BEGIN
OPEN TEST1;
FETCH TEST1
INTO TEST2;
CLOSE TEST1;
RETURN TEST2;
END FN_TESTING;
I do check my function, it shows me warning message that my TEST4_TEST must be declared.
Can I know what is the problem of this function? and how I do the declaration for this TEST4_TEST?
Yes we can return the record variable from PLSQL Function/Procedure. But first it must be declare.
create or replace function get_employee
(p_empl_no in employee.empl_no%type)
return employee%rowtype
as
l_cust_record employee%rowtype;
begin
select * into l_cust_record from employee
where empl_no = p_empl_no;
return(l_cust_record);
end;
/
Think TEST4_TEST as a variable which is of TYPE Record. This variable is just like NUMBER, VARCHAR, DATE. Only difference being that these are already defined by Oracle but in case of Collections and Records we have to define our own.
As per your example it seems that you want to return a record with 2 numbers values then you should define as follow
CREATE OR REPLACE PACKAGE TEST4_TEST1
AS
TYPE TEST4_TEST Is record
(
COL1 INTEGER,
COL2 INTEGER
);
END;
CREATE OR REPLACE FUNCTION FN_TESTING (testing1 IN VARCHAR2)
RETURN TEST4_TEST1.test4_test
AS
test3 TEST4_TEST1.test4_test;
CURSOR test2
IS
SELECT '1', '2' FROM DUAL;
A
BEGIN
OPEN test2;
FETCH test2 INTO test3;
CLOSE test2;
RETURN test3;
END fn_testing;
Try this also:
declare TYPE t_deptrec IS RECORD
(
name dept.dname%type,
location dept.loc%type
);
CURSOR c_emp is
select ename,deptno from emp;
r_dept t_deptrec;
function getDept(p_deptno dept.deptno%type) return t_deptrec is
r_dept t_deptrec;
begin
select dname,loc into r_dept
from dept where deptno = p_deptno;
return r_dept;
end;
BEGIN
for r_emp in c_emp
loop
r_dept := getDept(r_emp.deptno);
dbms_output.put_line(r_emp.ename || ',' || r_dept.name || ',' || r_dept.location);
end loop;
END;