Question

我在 PL / SQL函数中使用了以下光标，即getEmployeeInfo

CURSOR employeeDepartment IS
        SELECT *
        FROM Employee
        LEFT OUTER JOIN Department ON Department.empID = Employee.ID
        WHERE Employee.STATE = 'Washington'
        ORDER BY Employee.JoiningDate desc;

我需要修改getEmployeeInfo 功能，将 employeeId作为输入参数并附加到游标employeeDepartment 如果employeeId>0。

我是PL / SQL编程的新手。看起来我需要朝着 REF-CURSOR 的方向前进，但我无法完全弥补？

如果 Employee.id＆gt;那么光标查询应该在下面。 0 否则应与上述相同

CURSOR employeeDepartment IS
        SELECT *
        FROM Employee
        LEFT OUTER JOIN Department ON Department.empID = Employee.ID
        WHERE Employee.STATE = 'Washington'
        and Employee.id= 100
        ORDER BY Employee.JoiningDate desc;

更新： - @APC解决方案有效。通过使用该解决方案，如果我想要传递empId的数组而不是单个Id我在下面尝试过

首先使用create type p_employee_arr as table of number

创建数组类型

CURSOR employeeDepartment  (p_employee_arr IN num_array) IS
    SELECT *
    FROM Employee
    LEFT OUTER JOIN Department ON Department.empID = Employee.ID
    WHERE Employee.STATE = 'Washington'
    and (Employee.id in  (SELECT column_value  FROM TABLE( p_employee_arr )) or p_employee_arr is null)
    ORDER BY Employee.JoiningDate desc;

但是如果我在数组中提供一个元素

，它仍会返回完整的结果集

Answer 1

我认为您需要带有如下参数

的光标

CURSOR employeeDepartment (employee_id_in IN number)
IS
        SELECT *
        FROM Employee
        LEFT OUTER JOIN Department ON Department.empID = Employee.ID
        WHERE Employee.STATE = 'Washington'
        and 
        (case 
               when (employee_id_in > 0) and (Employee.id= employee_id_in)  then 1
        else 0
        end) = 1 
        ORDER BY Employee.JoiningDate desc;

因此您可以像

一样打开光标

open employeeDepartment(100)

有关详细信息，请参阅http://www.techonthenet.com/oracle/cursors/declare.php

Answer 2

您的问题有点含糊不清但我认为您希望在传递员工ID时限制结果集，否则您需要状态的所有记录。

CURSOR employeeDepartment  (p_employee_id in number) IS
    SELECT *
    FROM Employee
    LEFT OUTER JOIN Department ON Department.empID = Employee.ID
    WHERE Employee.STATE = 'Washington'
    and ( p_employee_id = 0 or Employee.id= p_employee_id )
    ORDER BY Employee.JoiningDate desc;

构建光标查询动态性质？

2 个答案: