参数化游标

您还可以声明接受参数的静态游标，并在打开该游标时传递这些参数的值。在下面的示例中，我们创建了一个参数化游标，该游标将显示emp表中其薪水低于作为参数传递的指定值的所有员工的姓名和薪水。

DECLARE
    my_record       emp%ROWTYPE;
    CURSOR c1 (max_wage NUMBER) IS
        SELECT * FROM emp WHERE sal < max_wage;
BEGIN
    OPEN c1(2000);
    LOOP
        FETCH c1 INTO my_record;
        EXIT WHEN c1%NOTFOUND;
        DBMS_OUTPUT.PUT_LINE('Name = ' || my_record.ename || ', salary = '
            || my_record.sal);
    END LOOP;
    CLOSE c1;
END;

例如，如果我们将值2000作为max_wage传递，那么将只显示薪水低于2000的所有员工的姓名和薪水。上述查询的结果如下：

Name = SMITH, salary = 800.00
Name = ALLEN, salary = 1600.00
Name = WARD, salary = 1250.00
Name = MARTIN, salary = 1250.00
Name = TURNER, salary = 1500.00
Name = ADAMS, salary = 1100.00
Name = JAMES, salary = 950.00
Name = MILLER, salary = 1300.00