types of Ref Cursor


EMPNO
ENAME
HIREDATE
DOB
GENDER
SAL
DEPTNO
JOB
1000
Sachin
11-Sep-85
01-Mar-20
M
25000
20
MANAGER
1002
Rena
01-Aug-82
11-Mar-20
F
125000
20

1008
Sonu
11-Sep-85
01-Mar-20
M
2500
10
CLERK
1003
Chavi
25-Mar-81
15-Feb-20
F
5000
20
CLERK
1006
Ravi
11-Sep-89
01-Mar-19
M
2500
10
CLERK
1005
Vinod
18-Sep-86
01-Mar-20
M
17000
30
DEVELOPER
1004
Rani
28-Jan-88
19-Jul-19
F
27000
30
MANAGER
1007
Manoj
11-Sep-85
09-Mar-18
M
18000
10
DEVELOPER
1001
Amit
11-Sep-80
01-Jan-20
M
10000
40
DEVELOPER
1009
Nitin Kumar
11-Sep-85
11-Mar-20
M
21000
20
DEVELOPER


--===================================================
Types of Ref Cursor
1. Strong type :- we explain the return type here.
2. WeaK type :- No need to explain the return type here.

--====================================================
--How to declare REF Cursor
--====================================================

DECLARE
TYPE XX_STRONG_REF IS REF CURSOR RETURN employees%ROWTYPE; -- strong type
C_EMP  XX_STRONG_REF; -- strong cursor variable

TYPE XX_WEAK_REF IS REF CURSOR; -- weak type
C_EMP  XX_WEAK_REF; -- weak cursor variable

C_EMP  SYS_REFCURSOR; -- weak cursor variable

BEGIN
NULL;
END;

--================
EXAMPLE :- --strong type
--================

DECLARE

TYPE XX_STRONG_REF IS REF CURSOR RETURN XX_EMP_TL%ROWTYPE; -- strong type
C_S_REF  XX_STRONG_REF; -- strong cursor variable

VAR_EMP XX_EMP_TL%ROWTYPE;
VAR_DEPT XX_DEPT_TL%ROWTYPE;
 
    BEGIN
    dbms_output.put_line ('************** EMPLOYEE DETAILS****************');     
        OPEN C_S_REF FOR  SELECT * FROM XX_EMP_TL ;
            LOOP               
                FETCH C_S_REF INTO VAR_EMP;
                EXIT WHEN C_S_REF%NOTFOUND;                                 
                 DBMS_OUTPUT.PUT_LINE (C_S_REF%ROWCOUNT||' - '||VAR_EMP.ENAME||' | salary is :- '||VAR_EMP.SAL);                   
            END LOOP;           
        CLOSE C_S_REF;     
       
--        dbms_output.put_line ('************** DEPARTMENT DETAILS****************');
--        OPEN C_S_REF FOR SELECT * FROM XX_DEPT_TL;
--            LOOP               
--                FETCH C_S_REF INTO VAR_DEPT;
--                EXIT WHEN C_S_REF%NOTFOUND;                                
--                 DBMS_OUTPUT.PUT_LINE (C_S_REF%ROWCOUNT||' - '||VAR_DEPT.DNAME);                   
--            END LOOP;           
--        CLOSE C_S_REF;
       
    END;

OUTPUT:-
************** EMPLOYEE DETAILS****************
1 - Sachin | salary is :- 25000
2 - Rena | salary is :- 125000
3 - Sonu | salary is :- 2500
4 - Chavi | salary is :- 5000
5 - Ravi | salary is :- 2500
6 - Vinod | salary is :- 17000
7 - Rani | salary is :- 27000
8 - Manoj | salary is :- 18000
9 - Amit | salary is :- 10000
10 - Nitin Kumar | salary is :- 21000


--================
EXAMPLE :- --Weak type
--================

DECLARE

TYPE XX_WEAK_REF IS REF CURSOR ; -- Weak type
C_W_REF  XX_WEAK_REF; -- weak cursor variable

VAR_EMP XX_EMP_TL%ROWTYPE;
VAR_DEPT XX_DEPT_TL%ROWTYPE;
 
    BEGIN
    dbms_output.put_line ('************** EMPLOYEE DETAILS****************');     
        OPEN C_W_REF FOR  SELECT * FROM XX_EMP_TL ;
            LOOP               
                FETCH C_W_REF INTO VAR_EMP;
                EXIT WHEN C_W_REF%NOTFOUND;                                
                 DBMS_OUTPUT.PUT_LINE (C_W_REF%ROWCOUNT||' - '||VAR_EMP.ENAME||' | salary is :- '||VAR_EMP.SAL);                   
            END LOOP;           
        CLOSE C_W_REF;     
       
        dbms_output.put_line ('************** DEPARTMENT DETAILS****************');
        OPEN C_W_REF FOR SELECT * FROM XX_DEPT_TL;
            LOOP               
                FETCH C_W_REF INTO VAR_DEPT;
                EXIT WHEN C_W_REF%NOTFOUND;                                
                 DBMS_OUTPUT.PUT_LINE (C_W_REF%ROWCOUNT||' - '||VAR_DEPT.DNAME);                   
            END LOOP;           
        CLOSE C_W_REF;
       
    END;

OUTPUT:-
************** EMPLOYEE DETAILS****************
1 - Sachin | salary is :- 25000
2 - Rena | salary is :- 125000
3 - Sonu | salary is :- 2500
4 - Chavi | salary is :- 5000
5 - Ravi | salary is :- 2500
6 - Vinod | salary is :- 17000
7 - Rani | salary is :- 27000
8 - Manoj | salary is :- 18000
9 - Amit | salary is :- 10000
10 - Nitin Kumar | salary is :- 21000
************** DEPARTMENT DETAILS****************
1 - ACCOUNTING
2 - RESEARCH
3 - SALES
4 - OPERATIONS


DECLARE
-- SYS_REFCURSOR  System defind ref type ----
--TYPE XX_WEAK_REF IS REF CURSOR ; -- Weak type
C_W_REF  SYS_REFCURSOR; -- weak cursor variable

VAR_EMP XX_EMP_TL%ROWTYPE;
VAR_DEPT XX_DEPT_TL%ROWTYPE;
 
    BEGIN
    dbms_output.put_line ('************** EMPLOYEE DETAILS****************');     
        OPEN C_W_REF FOR  SELECT * FROM XX_EMP_TL ;
            LOOP               
                FETCH C_W_REF INTO VAR_EMP;
                EXIT WHEN C_W_REF%NOTFOUND;                                
                 DBMS_OUTPUT.PUT_LINE (C_W_REF%ROWCOUNT||' - '||VAR_EMP.ENAME||' | salary is :- '||VAR_EMP.SAL);                   
            END LOOP;           
        CLOSE C_W_REF;     
       
        dbms_output.put_line ('************** DEPARTMENT DETAILS****************');
        OPEN C_W_REF FOR SELECT * FROM XX_DEPT_TL;
            LOOP               
                FETCH C_W_REF INTO VAR_DEPT;
                EXIT WHEN C_W_REF%NOTFOUND;                                
                 DBMS_OUTPUT.PUT_LINE (C_W_REF%ROWCOUNT||' - '||VAR_DEPT.DNAME);                   
            END LOOP;           
        CLOSE C_W_REF;
       
    END;

OUTPUT:-
************** EMPLOYEE DETAILS****************
1 - Sachin | salary is :- 25000
2 - Rena | salary is :- 125000
3 - Sonu | salary is :- 2500
4 - Chavi | salary is :- 5000
5 - Ravi | salary is :- 2500
6 - Vinod | salary is :- 17000
7 - Rani | salary is :- 27000
8 - Manoj | salary is :- 18000
9 - Amit | salary is :- 10000
10 - Nitin Kumar | salary is :- 21000
************** DEPARTMENT DETAILS****************
1 - ACCOUNTING
2 - RESEARCH
3 - SALES
4 - OPERATIONS


--====================================================
--Example  Cursor Variable with User-Defined Return Type
--====================================================

DECLARE

TYPE XX_EMP_TYPE IS RECORD (
EMPNO NUMBER,
ENAME VARCHAR2(100),
SAL NUMBER);

TYPE XX_STRONG_REF IS REF CURSOR RETURN XX_EMP_TYPE; -- strong type
C_S_REF  XX_STRONG_REF; -- strong cursor variable

VAR_EMP XX_EMP_TYPE;
 
    BEGIN
    dbms_output.put_line ('************** EMPLOYEE DETAILS****************');     
        OPEN C_S_REF FOR  SELECT EMPNO, ENAME, SAL FROM XX_EMP_TL ;
            LOOP               
                FETCH C_S_REF INTO VAR_EMP;
                EXIT WHEN C_S_REF%NOTFOUND;                                
                 DBMS_OUTPUT.PUT_LINE (C_S_REF%ROWCOUNT||' - '||VAR_EMP.ENAME||' | salary is :- '||VAR_EMP.SAL);                   
            END LOOP;           
        CLOSE C_S_REF;     
               
    END;

OUTPUT:-
************** EMPLOYEE DETAILS****************
1 - Sachin | salary is :- 25000
2 - Rena | salary is :- 125000
3 - Sonu | salary is :- 2500
4 - Chavi | salary is :- 5000
5 - Ravi | salary is :- 2500
6 - Vinod | salary is :- 17000
7 - Rani | salary is :- 27000
8 - Manoj | salary is :- 18000
9 - Amit | salary is :- 10000
10 - Nitin Kumar | salary is :- 21000


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