Explicit Cursor


--====================================================
--Explicit Cursor
/*
An explicit cursor is a session cursor that you           construct and manage.
You must declare and define an explicit cursor, giving it a name and associating it with a query (typically, the query returns multiple rows).

we can process  Explicit cursor  data by using two ways as below

1. Open the explicit cursor (with the OPEN statement), fetch rows from the result set (with the FETCH statement), and close the explicit cursor (with the CLOSE statement).
2. Use the explicit cursor in a cursor FOR LOOP statement

*/

EMPNO
ENAME
HIREDATE
DOB
GENDER
SAL
DEPTNO
CREATION_DATE
JOB
COMM
1000
Sachin
11-Sep-85
01-Mar-20
M
25000
20
21-04-2020 18:46
MANAGER

1002
Kumar
01-Aug-82
11-Mar-20
M
125000
20
21-04-2020 18:46


1008
Sonu
11-Sep-85
01-Mar-20
M
2500
10
21-04-2020 18:46
CLERK

1003
Chavi
25-Mar-81
15-Feb-20
F
5000
20
21-04-2020 18:46
CLERK

1006
Ravi
11-Sep-89
01-Mar-19
M
2500
10
21-04-2020 18:46
CLERK

1005
Vinod
18-Sep-86
01-Mar-20
M
17000
30
21-04-2020 18:46
DEVELOPER

1004
Neel
28-Jan-88
19-Jul-19
M
27000
30
21-04-2020 18:46
MANAGER

1007
Manoj
11-Sep-85
09-Mar-18
M
18000
10
21-04-2020 18:46
DEVELOPER

1001
Amit
11-Sep-80
01-Jan-20
M
10000
40
21-04-2020 18:46
DEVELOPER


--Example:- --============================================
--- DECLARE / OPEN  / FETCH / CLOSE ----     without loop fetch statement ----

DECLARE
  v_name XX_EMP_TL.ENAME%TYPE;
 
  CURSOR C1 IS 
  SELECT ename FROM XX_EMP_TL ;

    BEGIN
     
        OPEN C1;
          
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
           
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
            FETCH C1 INTO v_name;   DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);     
             
        CLOSE C1;
     
    END;

OUTPUT:-
1 - Sachin
2 - Rena
3 - Sonu
4 - Chavi
5 - Ravi
6 - Vinod
7 - Rani
8 - Manoj
9 - Amit
10 - Nitin Kumar
10 - Nitin Kumar
10 - Nitin Kumar
10 - Nitin Kumar

--========================== Single Column =================

DECLARE
  v_name XX_EMP_TL.ENAME%TYPE;

  CURSOR C1 IS 
  SELECT ename FROM XX_EMP_TL ;

    BEGIN     
        OPEN C1;
            LOOP               
                FETCH C1 INTO v_name;
                EXIT WHEN C1%NOTFOUND;                                
                 DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name);
                   
            END LOOP;
           
        CLOSE C1;     
    END;

OUTPUT:-
1 - Sachin
2 - Rena
3 - Sonu
4 - Chavi
5 - Ravi
6 - Vinod
7 - Rani
8 - Manoj
9 - Amit
10 - Nitin Kumar

--========================== Duble Column =================
DECLARE
  v_name XX_EMP_TL.ENAME%TYPE;
  V_Sal XX_EMP_TL.SAL%TYPE;

  CURSOR C1 IS 
  SELECT ename, sal FROM XX_EMP_TL ;

    BEGIN     
        OPEN C1;
            LOOP               
                FETCH C1 INTO v_name, V_Sal;
                EXIT WHEN C1%NOTFOUND;                                 
                 DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||v_name||' | salary is :- '||V_Sal);
                   
            END LOOP;
           
        CLOSE C1;     
    END;

OUTPUT:-
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

--==================Full Table Column  Used ========================   
   
DECLARE
  V_EMP XX_EMP_TL%ROWTYPE;

  CURSOR C1 IS 
  SELECT * FROM XX_EMP_TL ;

    BEGIN     
        OPEN C1;
            LOOP               
                FETCH C1 INTO V_EMP;                    
            EXIT WHEN C1%NOTFOUND;
            DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||V_EMP.ename);
            END LOOP;
        CLOSE C1;     
    END;
   
OUTPUT:-
    1 - Sachin
2 - Rena
3 - Sonu
4 - Chavi
5 - Ravi
6 - Vinod
7 - Rani
8 - Manoj
9 - Amit
10 - Nitin Kumar

--====================================================   
--- CURSOR FOR LOOP ----
--====================================================

DECLARE

  CURSOR C1 IS 
  SELECT * FROM XX_EMP_TL ;

    BEGIN     
        FOR I IN C1 
            LOOP               
                DBMS_OUTPUT.PUT_LINE (C1%ROWCOUNT||' - '||I.ename||' - '||I.SAL);                            
            END LOOP;     
    END;


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



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