cursor types? explain with example programs?

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cursor types? explain with example programs?..

Cursor Types
- Implicit Cursor
- Explicit Cursor (Without parameters, With Parameters)

############################################
##### Implicit Cursor #####################
############################################

-- assuming there is a table emp in the schema
DECLARE
VENAME EMP.ENAME%TYPE ;
BEGIN
SELECT ENAME INTO VENAME FROM EMP WHERE EMPNO = &EMPLOYEENUMBER ;
IF SQL%FOUND THEN
DBMS_OUTPUT.PUT_LINE('EMPLOYEE NAME IS ' || VENAME);
END IF ;
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('NO EMPLOYEE WITH GIVE EMPLOYEE NUMBER ') ;
END ;
/

############################################
##### Explicit Cursor #####################
############################################

-- First method
===============

DECLARE
CURSOR C1 IS SELECT EMPNO, ENAME FROM EMP ;
BEGIN
FOR I IN C1
LOOP
DBMS_OUTPUT.PUT(I.EMPNO);
DBMS_OUTPUT.PUT_LINE(' -- ' || I.ENAME);
END LOOP ;
END ;
/

-- Second method
================

DECLARE
CURSOR C1 IS SELECT EMPNO, ENAME FROM EMP ;
E C1%ROWTYPE ;
BEGIN
OPEN C1 ;
LOOP
FETCH C1 INTO E ;
EXIT WHEN C1%NOTFOUND ;
DBMS_OUTPUT.PUT(E.EMPNO);
DBMS_OUTPUT.PUT_LINE(' -- ' || E.ENAME);
END LOOP ;
CLOSE C1 ;
END ;
/

-- With Parameters
==================

DECLARE
CURSOR C1(n number) IS SELECT EMPNO, ENAME FROM EMP where sal < n;
E C1%ROWTYPE ;
BEGIN
OPEN C1(&salary) ;
loop
FETCH C1 INTO E ;
exit when c1%notfound ;
DBMS_OUTPUT.PUT(E.EMPNO);
DBMS_OUTPUT.PUT_LINE(' -- ' || E.ENAME);
end loop ;
CLOSE C1 ;
END ;
/

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