Question

大编辑以包含更多详情

我们为参加者展示会议供您选择。每个会议都有一个副本，被视为等待列表＆＃34;版。等待列表ID存储在字段waitListProdID中的父记录中。某些字段也会被标记。

会议记录= isWaitlist = 0，waitListProdID = *whatever its waitlist ID is* 会议候补名单记录= isWaitList = 1，waitListProdID = 0

与会者仅在两个条件下查看等候名单版本：

当会议的currentAttendance等于maxAttendance
如果来自与会者公司的两个人已经在任何特定会议上注册并且当前的出席＆lt; maxAttendance

候补名单会议没有出席上限或公司限制。

我的任务是生成一个UDF来处理第二个问题。它应该返回会议ID（主要或等候名单）。 UDF将接收3个输入和1个输出，其输出是传入的conferenceID或等效的等候名单。

我知道我的UDF语法不正确，因为我对存储过程创建比较熟悉，但我尽量让它尽可能接近。

//This query calls the UDF (build in ColdFusion)
SELECT dt.conferenceID, ec.description, ec.price
FROM (
   SELECT dbo.fnGetConfID(eci.conferenceID, #companyID#, #eventID#) as conferenceID
   FROM tblEventConferences eci
   WHERE eci.eventID = #eventID#
) dt
INNER JOIN tblEventConferences eco ON eci.conferneceID = eco.conferenceID
WHERE eco.eventID = #eventID#
AND eco.currentAttendance < eco.maxAttendance

//The function should return only the correct conferenceID
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION dbo.fnGetConfID (
    @conferenceID int,
    @companyID varchar(32),
    @eventID int,
) RETURNS int
AS
BEGIN
    DECLARE @count smallint;
    DECLARE @waitListID int;
    SET NOCOUNT ON;

    --Search only conferences that are not waitlist
    SELECT @count = count(rc.regID), @waitListID = rc.conferenceID
    FROM tblRegistration r
        INNER JOIN tblRegConferences rc ON r.ID = rc.regID
        INNER JOIN tblEventConferences ec ON rc.conferenceID = ec.conferenceID
    WHERE r.eventID = @eventID
    AND r.optfield2 = @companyID
    AND rc.conferenceID = @conferenceID
    AND ec.isWaitList = 0
    AND ec.currentAttendance < ec.maxAttendance
    GROUP BY rc.conferenceID

    --More than 1 person from same company registered for this conference. Return waitlistID
    IF @count > 1
    BEGIN
      SELECT @conferenceIDout = conferenceID
      FROM tblEventConferences
      WHERE conferenceID = @waitListID
    END

    --Company limit not reached. Return conferenceID that was used originally
    IF @count <= 1
    BEGIN
      SET @conferenceIDout = @conferenceID
    END

END
GO

基于多个条件的UDF查询中的返回值

0 个答案: