Dynamic cursors

Question

Hi,
I'm trying to work on dynamic cursors.
When I try to execute the below code, I'm getting the following error.
BEGIN
  DYNAMIC_CURSOR.OPENCURSOR();
END;
exception raised ORA-00932: inconsistent datatypes: expected - got -
  Below is my code:
CREATE OR REPLACE
PACKAGE BODY dynamic_cursor AS
    PROCEDURE dyn_sel (
        tab_name   IN VARCHAR2,
        field_name IN VARCHAR2,
        val        IN VARCHAR2,
        crs        IN OUT t_crs)
    IS
        stmt VARCHAR2(200);
    BEGIN
        stmt := 'select * from '|| tab_name || ' where '|| field_name ||  ' = :1';
        OPEN crs FOR stmt USING val;
    END dyn_sel;
    PROCEDURE openCursor IS
        tc t_crs;
        f1 VARCHAR2(50);
        f2 VARCHAR2(50);
    BEGIN
        dyn_sel ('EMP','JOB','MANAGER', tc);
        LOOP
            FETCH tc INTO f1, f2;
            EXIT WHEN tc%notfound;
            dbms_output.put_line (f2);
        END LOOP;
    EXCEPTION
        WHEN OTHERS THEN
            dbms_output.put_line ('exception raised '||SQLERRM);
    END openCursor;
END dynamic_cursor; -Thanks

Answer 1

The selected columns must match the INTO clause, so you need to exactly fetch two columns as e.g. in
  stmt := 'select ename, job from ' || tab_name || ' where ' || field_name || ' = :1';
....