How to check if cursor returns any records in oracle?

Question

I have a following stored procedure in which I have used a cursor. Depending on whether the cursor return any records or not I need to do some processing.

But I am

Answer 1

341/5000 One solution would be to work with reverse logic. It is e.g. not possible to ask:

IF my_record IS NULL THEN
   do something;
END IF;

or

IF my_record.my_attibute IS NULL THEN
   do something;
END IF;

Instead it is possible to ask:

IF my_record.my_attibute IS NOT NULL THEN
   go on processing;
ELSE
   do something;
END IF;

Answer 2

I like this way:

DECLARE

    CURSOR my_cur
    IS
    SELECT 'a' AS a FROM DUAL WHERE 1=1;

    my_rec my_cur%rowtype;

BEGIN
    OPEN my_cur;
    LOOP

        FETCH my_cur INTO my_rec;

        IF my_cur%NOTFOUND
        THEN
            IF my_cur%ROWCOUNT=0
            THEN
                -- do stuff when cursor empty
                DBMS_OUTPUT.PUT_LINE('NOTFOUND,RC=0' || '_' || my_cur%ROWCOUNT || '_' || my_rec.a);
            END IF;
            EXIT;
        ELSE
                -- do stuff when cursor not empty
            DBMS_OUTPUT.PUT_LINE('FOUND,RC>0' || '_' || my_cur%ROWCOUNT || '_' || my_rec.a);
        END IF;

    END LOOP;
    CLOSE MY_CUR;
END;

Output when cursor is 1=1 (not empty):

FOUND,RC>0_1_a

Output when cursor is 1=0 (empty):

NOTFOUND,RC=0_0_

Answer 3

It's not possible to check if the cursor returns records without opening it.
(see here)
So you can either have some fast query just to see if there are records (using count for example),

Or, you can do it like this:

CREATE OR REPLACE PROCEDURE SP_EMPLOYEE_LOOKUP_BY_EMP_ID
(
      IN_USER_ID IN NUMBER, 
      IN_EMPLOYEE_ID NUMBER,
      IN_HC_AS_ON_DATE VARCHAR2,
      emp_cursor OUT SYS_REFCURSOR
) 
IS 

 is_found_rec boolean := false;    

 CURSOR employees IS 
    SELECT  * FROM EMPLOYEE e; 

BEGIN    

 FOR employee IN employees
  LOOP  

    is_found_rec := true;

        // do something  

  END LOOP; 

 if not is_found_rec then 
     // do something else 
 end if;

END;

Answer 4

I think that it possible only with FETCH. Try to use

if myCursor%found then
// some body
end if;

But if somebody know another way so correct me.

Answer 5

I like to use the same select query that comprises the cursor and select the count it returns into a variable. You can then evaluate the variable to determine what to do next. For example you have a cursor like this:

CURSOR c_example IS 
    SELECT field1
        ,field2
        ,field3
    FROM table1 a
    WHERE a.field1 LIKE '%something%';

Before you open the cursor to do any processing, select cursor result count into a variable.

SELECT count(*)
INTO v_exampleCount
FROM table1 a
WHERE a.field1 LIKE '%something%';

Now, again before you open cursor, do something like:

IF exampleCount>0 THEN

    FOR example IN c_example
    LOOP
        ....
    END LOOP;  --end example loop

    ....

END IF;  --end example if