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Cursor

Posted on 2007-11-26
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Last Modified: 2013-12-07
Below code doesn't work

================================================
DECLARE
  empnum  tablename.empno%TYPE;
  name    tablename.ename%TYPE;
  TYPE cursor_var IS REF CURSOR;
  myCursorVar cursor_var;
BEGIN
  OPEN myCursorVar FOR SELECT empno,ename FROM tablename;
 
  for x IN myCursorVar LOOP
      DBMS_OUTPUT.PUT_LINE(x.empnum|| '  '|| x.name|| ' rowcount is ' || myCursorVar%ROWCOUNT);
 END LOOP;
 CLOSE myCursorVar;
=======================

but I change the
" for loop under BEGIN structure with below mention LOOP and END LOOP , it is working" --

LOOP
    FETCH myCursorVar INTO empnum,name;
    EXIT WHEN myCursorVar%NOTFOUND;
    DBMS_OUTPUT.PUT_LINE(name||'  '||empnum||' rowcount is '||
      myCursorVar%ROWCOUNT);
  END LOOP;


Question :: why it is not working with FOR loop ? or I am doing any mistakes

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Question by:gauravflame
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2 Comments
 
LVL 23

Assisted Solution

by:Ashish Patel
Ashish Patel earned 100 total points
ID: 20356211
In most situations that require an explicit cursor, you can simplify coding by using a cursor FOR loop instead of the OPEN, FETCH, and CLOSE statements. A cursor FOR loop implicitly declares its loop index as a record that represents a row fetched from the database. Next, it opens a cursor, repeatedly fetches rows of values from the result set into fields in the record, then closes the cursor when all rows have been processed. In the following example, the cursor FOR loop implicitly declares emp_rec as a record: See the example below.

DECLARE
   CURSOR c1 IS
      SELECT ename, sal, hiredate, deptno FROM emp;
   ...
BEGIN
   FOR emp_rec IN c1 LOOP
      ...
      salary_total :=  salary_total + emp_rec.sal;
   END LOOP;

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LVL 27

Accepted Solution

by:
sujith80 earned 150 total points
ID: 20356338
>> why it is not working with FOR loop ? or I am doing any mistakes

Yes. REF CURSORs doesnt support the cursor FOR loop syntax.
You have to explicitly open-fetch-close ref-cursors.
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