oracle - ORACLE FOOR LOOP 带光标

Question

我有带有 Cursor 和 fetch 的 LOOP 语句，但我想要“FOR LOOP”。

DECLARE
   emp_rec employees%ROWTYPE;
   CURSOR Cur_emp IS 
     SELECT * 
       FROM employees 
      order by employees.last_name asc; 
BEGIN
   OPEN Cur_emp;
   LOOP
      FETCH Cur_emp INTO emp_rec; 
      exit when Cur_emp%notfound;
      dbms_output.put_line(‘Employee Name–>’|| emp_rec.LAST_NAME);
   END LOOP;
   CLOSE Cur_emp;  
END;

我想喜欢：

DECLARE
   emp_rec employees%ROWTYPE;
   CURSOR Cur_emp IS 
     SELECT * 
       FROM employees 
      order by employees.last_name asc; 
BEGIN
   FOR item IN Cur_emp
   LOOP
     FETCH Cur_emp INTO emp_rec;
     exit when Cur_emp%notfound;
     dbms_output.put_line(‘Employee Name–>’|| emp_rec.LAST_NAME);
   END LOOP;
END;
/

这不起作用，因为FETCH Cur_emp INTO emp_rec INVALID CURSOR ORA-01001

Answer 1

删除FETCHand EXIT WHEN，并将 emp_rec 引用替换为 item，如下所示：

DECLARE
CURSOR Cur_emp IS SELECT * FROM employees order by employees.last_name asc; 
BEGIN
FOR item IN Cur_emp
LOOP
dbms_output.put_line(‘Employee Name–>’|| item.LAST_NAME);
END LOOP;
END;
/