dynamically pass table name in oracle for loop

问题

Is it possible to dynamically pass table name in oracle for loop ?

e.g :-

for nm in ('select * from '|| table_name))
     loop 

      dbms_output.put_line('chetan') ;
end loop;

回答1:

You can use a REF CURSOR type cursor. From Oracle Doc: (contains also binds - you don't asked for them...)

CREATE OR REPLACE PROCEDURE query_invoice(
       month VARCHAR2, 
       year VARCHAR2) IS
    TYPE cur_typ IS REF CURSOR;
    c cur_typ;
    query_str VARCHAR2(200);
    inv_num NUMBER;
    inv_cust VARCHAR2(20);
    inv_amt NUMBER;
BEGIN
    query_str := 'SELECT num, cust, amt FROM inv_' || month ||'_'|| year 
      || ' WHERE invnum = :id';
    OPEN c FOR query_str USING inv_num;
    LOOP
        FETCH c INTO inv_num, inv_cust, inv_amt;
        EXIT WHEN c%NOTFOUND;
        -- process row here
    END LOOP;
    CLOSE c;
END;
/

来源：https://stackoverflow.com/questions/8969449/dynamically-pass-table-name-in-oracle-for-loop