SQL Using an OBJECT as parameter for an ORDER mthod - sql

Question

I have a TYPE called Employee which has an ORDER method which takes an Employee as a parameter. I have created a table of Employee and inserted some data. I am trying to test this ORDER method using SELECT however i am having difficulty satisfying the parameter. here is my code
CREATE OR REPLACE TYPE Employee AS OBJECT(
EmpID VARCHAR(15),
eName VARCHAR(30),
ePhone NUMBER,
eAddress VARCHAR(15),
ePosition VARCHAR(15),
eHireDt DATE,
salary NUMBER,
ORDER MEMBER FUNCTION orderSalary (e Employee) RETURN NUMBER)
NOT FINAL;
/
CREATE OR REPLACE TYPE BODY Employee AS
ORDER MEMBER FUNCTION orderSalary(e Employee) return number IS
BEGIN
IF(self.salary > e.salary) then
return(1);
ELSIF (self.salary < e.salary) then
return(-1);
ELSE
return(0);
END IF;
END;
END;
/
CREATE TABLE Emp OF Employee (EmpID PRIMARY KEY)
OBJECT IDENTIFIER PRIMARY KEY;
insert into Emp values('001','kabir',6477732272,'Pharmacy','clerk','2016-03-28',2000);
Here is the line that is giving me trouble:
SELECT p.orderSalary(Employee s) FROM Emp p;
All i need to do is test this method to make sure it works, is there any way i can create an instance of Employee to use as a parameter, or perhaps take a row from the Emp table? Thanks!

Answer 1

SELECT p.orderSalary( VALUE( p ) ) FROM Emp p;
Or:
SELECT p.orderSalary( DEREF( REF( p ) ) ) FROM Emp p;
Or:
SET SERVEROUTPUT ON;
DECLARE
e1 EMPLOYEE := NEW EMPLOYEE('001','kabir',6477732272,'Pharmacy','clerk',DATE '2016-03-28',2000);
e2 EMPLOYEE := NEW EMPLOYEE('002','bob',1234567890,'Library','assistant',DATE '2016-03-07',1000);
BEGIN
DBMS_OUTPUT.PUT_LINE( e1.orderSalary( e2 ) );
END;
/
Update - Select different rows:
insert into Emp values('001','kabir',6477732272,'Pharmacy','clerk','2016-03-28',2000);
insert into Emp values('002','bob',1234567890,'Library','assistant',DATE '2016-03-07',1000);
SELECT e1.ename AS name1,
e2.ename AS name2,
e1.orderSalary( VALUE( e2 ) )
FROM Emp e1
CROSS JOIN Emp e2;
Outputs:
NAME1 NAME2 E1.ORDERSALARY(VALUE(E2))
------ ------ -------------------------
kabir kabir 0
kabir bob 1
bob kabir -1
bob bob 0