• 例子

DECLARE

CURSOR emp IS
SELECT first_name, last_name FROM hr.employees;

my_emp2 emp%ROWTYPE;

fir_name hr.employees.first_name%TYPE;

BEGIN

WITH emp_temp AS 
(
SELECT first_name FROM hr.employees WHERE first_name = 'Ellen'
)
SELECT first_name INTO fir_name FROM emp_temp;

DBMS_OUTPUT.PUT_LINE( 'first_name -- ' || fir_name );


OPEN emp;

LOOP

FETCH emp INTO my_emp2;
EXIT WHEN emp%NOTFOUND;



DBMS_OUTPUT.PUT_LINE( 'fetch -- ' || my_emp2.first_name || '-' || my_emp2.last_name );

END LOOP;

CLOSE emp;

FOR eachemp IN emp LOOP
DBMS_OUTPUT.PUT_LINE( 'for -- ' || eachemp.first_name || '-' || eachemp.last_name );
END LOOP;

END;
/


SELECT * FROM  V$OPEN_CURSOR

• for 循环的好处

可以省去定义游标变量，打开游标，关闭游标等操作。代码少，看起来简练；
可以使用匿名游标，将游标写在in和loop中间