Oracle游标CURSOR使用入门

     带参数的游标，和存储过程和函数相似，可以将参数传递给游标并在查询中使用。多用于在某种条件下打开游标的情况。

     与存储过程不同的是，游标只能接受传递的值，而不能返回值。参数只定义数据类型，没有大小。

     例子如下：

DECLARE

    CURSOR c_dept IS SELECT * FROM DEPT ORDER BY DEPTNO;

    CURSOR c_emp (p_dept VARCHAR2)

    IS SELECT ENAME, SAL FROM EMP WHERE DEPTNO=p_dept ORDER BY ENAME;

    

    r_dept DEPT%ROWTYPE;

    v_ename EMP.ENAME%TYPE;

    v_salary EMP.SAL%TYPE;

    v_total_salary v_salary%TYPE;

BEGIN

    OPEN c_dept;

        LOOP

            FETCH c_dept INTO r_dept;

            EXIT WHEN c_dept%NOTFOUND;

            DBMS_OUTPUT.PUT_LINE('Department: ' || r_dept.DEPTNO || '-' || r_dept.DNAME);

            v_total_salary := 0;

            OPEN c_emp (r_dept.DEPTNO);

                LOOP

                    FETCH c_emp INTO v_ename, v_salary;

                    EXIT WHEN c_emp%NOTFOUND;

                    DBMS_OUTPUT.PUT_LINE('Name: ' || v_ename || ' Salary: ' || v_salary);

                    v_total_salary := v_total_salary + v_salary;

                END LOOP;

            CLOSE c_emp;

            DBMS_OUTPUT.PUT_LINE('Total salary of depart: ' || v_total_salary);

        END LOOP;

    CLOSE c_dept;

END;

 url:http://greatverve.cnblogs.com/archive/2011/07/12/oracle-cursor.html