编写高级过滤系统

Question

这是我的关系

用户希望能够使用下拉菜单添加过滤器并相应地过滤志愿者。过滤器来自 VolunteerWorkArea table (VolunteerWorkAreaId)。我这样做的方式很痛苦，可能是因为缺乏知识。每次用户添加新过滤器时，我都必须以复杂的方式更改 SQL。例如，这是用户添加三个过滤器后的 SQL。

SELECT DISTINCT
        Volunteer.VolunteerId AS Volunteer_VolunteerId ,
        Volunteer.VolunteerFirstName ,
        Volunteer.VolunteerLastName ,
        Volunteer.VolunteerOtherName ,
        Volunteer.VolunteerStreetAddress ,
        Volunteer.VolunteerSuburb ,
        Volunteer.VolunteerPostCode ,
        Volunteer.VolunteerHomePhone ,
        Volunteer.VolunteerMobilePhone ,
        Volunteer.VolunteerGender
FROM    Volunteer
        INNER JOIN ( VolunteerWorkArea
                     INNER JOIN VolunteerWorkAreaAllocation ON VolunteerWorkArea.VolunteerWorkAreaId = VolunteerWorkAreaAllocation.VolunteerWorkAreaId
                   ) ON Volunteer.VolunteerId = VolunteerWorkAreaAllocation.VolunteerId
WHERE   VolunteerWorkAreaAllocation.[VolunteerWorkAreaId] = 17
        AND Volunteer.VolunteerId IN (
        SELECT DISTINCT
                Volunteer.VolunteerId
        FROM    Volunteer
                INNER JOIN ( VolunteerWorkArea
                             INNER JOIN VolunteerWorkAreaAllocation ON VolunteerWorkArea.[VolunteerWorkAreaId] = VolunteerWorkAreaAllocation.[VolunteerWorkAreaId]
                           ) ON Volunteer.[VolunteerId] = VolunteerWorkAreaAllocation.[VolunteerId]
        WHERE   VolunteerWorkAreaAllocation.[VolunteerWorkAreaId] = 16
                AND Volunteer.VolunteerId IN (
                SELECT DISTINCT
                        Volunteer.VolunteerId AS Volunteer_VolunteerId
                FROM    Volunteer
                        INNER JOIN ( VolunteerWorkArea
                                     INNER
JOIN VolunteerWorkAreaAllocation ON VolunteerWorkArea.[VolunteerWorkAreaId] = VolunteerWorkAreaAllocation.[VolunteerWorkAreaId]
                                   ) ON Volunteer.[VolunteerId] = VolunteerWorkAreaAllocation.[VolunteerId]
                WHERE   VolunteerWorkAreaAllocation.[VolunteerWorkAreaId] = 15 ) );

所以每次用户添加过滤器时，我都必须通过代码大量更改 SQL。我很确定有一种简单的方法可以做到这一点。有人可以帮帮我吗？谢谢！

Answer 1

如果您希望用户根据 volunteerWorkArea 决定 volunteers，那么更简单的解决方案是使用子表单。

创建一个不基于任何 table
使用向导创建并绑定带有 volunteerWorkArea table 的组合框（比如 name: combo2）。
创建一个子表单并将其与其他两个 table 绑定，即 volunteer & volunteerWorkAreaAllocation（图像的字段数较少示例)
通过将可见属性设置为 false 来隐藏 ID 字段。
如图所示设置子窗体控件属性 (combo2 as master field 和 Child 作为 volunteerWorkAreaID)

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