Exception error when creating procedure oracle sql developer - oracle

Question

i have been whacking my brain for the past 2 hours can't find a solution to this error. I am creating a simple procedure to find an employee. PL/SQL keeps giving me error. What is the problem ? what am i doing wrong here ?
This is my Procedure:
create or replace PROCEDURE find_employee (employeeNo IN number) as
INVALID_ID exception;
TOO_MANY_ROWS exception;
res number;
BEGIN
dbms_output.enable;
Select count(*) into res from employee where ID=employeeNo;
if (res>1)then -- Checking that the total count of the employee is 1 or not
raise TOO_MANY_ROWS; -- if greater then 1 then it raise TOO_MANY_ROWS error
ELSE IF (NOT EXISTS (Select ID from employee where ID=employeeNo)) -- Checking that the employeeNo user passes exist or not
then
raise INVALID_ID; -- if employeeNo doesnot exit then display invalid id message
ELSE
Select* from Employee where ID=employeeNo; -- else return employee info whose id==employeeNo
END IF;
EXCEPTION
when TOO_MANY_ROWS then
DBMS_OUTPUT.PUT_LINE ('Too many Rows with same employee id');
when INVALID_ID then
DBMS_OUTPUT.PUT_LINE ('Invalid employee id');
END find_employee;
And error is this:
Error(15,1): PLS-00103: Encountered the symbol "EXCEPTION" when expecting one of the following: ( begin case declare end exit for goto if loop mod null pragma raise return select update while with <an identifier> <a double-quoted delimited-identifier> <a bind variable> << continue close current delete fetch lock insert open rollback savepoint set sql execute commit forall merge pipe purge
Error(20,18): PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following: end not pragma final instantiable order overriding static member constructor map
Please God Help me :'(

Answer 1

You're missing END IF (line #16). it is easier to spot it if you write formatted code (nested IF should have been indented).
SQL> create or replace PROCEDURE find_employee (employeeNo IN number) as
2 INVALID_ID exception;
3 TOO_MANY_ROWS exception;
4 res number;
5 BEGIN
6 dbms_output.enable;
7 Select count(*) into res from employee where ID=employeeNo;
8 if (res>1)then -- Checking that the total count of the employee is 1 or not
9 raise TOO_MANY_ROWS; -- if greater then 1 then it raise TOO_MANY_ROWS error
10 ELSE IF (NOT EXISTS (Select ID from employee where ID=employeeNo)) -- Checking that the employeeNo user passes exist or not
11 then
12 raise INVALID_ID; -- if employeeNo doesnot exit then display invalid id message
13 ELSE
14 Select* from Employee where ID=employeeNo; -- else return employee info whose id==employeeNo
15 END IF;
16 END IF; --> this is missing
17 EXCEPTION
18 when TOO_MANY_ROWS then
19 DBMS_OUTPUT.PUT_LINE ('Too many Rows with same employee id');
20 when INVALID_ID then
21 DBMS_OUTPUT.PUT_LINE ('Invalid employee id');
22 END find_employee;
As #Dornaut commented, that code probably isn't the best one could produce. Here's another option; see if it helps.
CREATE OR REPLACE PROCEDURE find_employee (employeeNo IN NUMBER)
AS
res NUMBER;
e_row employee%ROWTYPE;
BEGIN
SELECT *
INTO e_row
FROM employee
WHERE id = employeeNo;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
DBMS_OUTPUT.put_line ('Invalid employee ID');
WHEN TOO_MANY_ROWS
THEN
DBMS_OUTPUT.put_line ('Too many rows with same employee ID');
END find_employee;
So: if SELECT returns NO_DATA_FOUND or TOO_MANY_ROWS, it'll be handled. Otherwise, it'll fetch the whole row into a variable.