我查詢過濾不工作，我希望它

Question

的方式，我有3個方面，我想過濾：

按名稱

2. 通過列表
3. 並顯示所有

我使用ASP.NET 3.5和SQL Server 2008.使用ADO.NET和存儲特效。

我傳遞我的列表作爲表值參數（但我正在測試一個表變量）和名稱作爲nvarchar。我有「全部顯示」爲ISNULL（@var，column）=列。很明顯，我查詢的方式沒有利用短路或我對WHERE子句缺乏工作的理解。發生什麼事情是，如果我使@var ='一些字符串'並向表變量插入一個空值，那麼它會正確過濾。如果我使@var = null並向表變量中插入'一些字符串'，那麼我得到每一條記錄，我應該得到'一些字符串'。

代碼：

declare @resp1 nvarchar(32) 
set @resp1 = null 
declare @usersTable table 
(responsible nvarchar(32)) 
--insert into @usersTable (responsible) values (null) 
insert into @usersTable (responsible) values ('ssimpson') 
insert into @usersTable (responsible) values ('kwilcox') 
select uT.responsible, jsq.jobnumber, jsq.qid, aq.question, aq.section, aq.seq, answers.* 
from answers 
inner join jobno_specific_questions as jsq on answers.jqid = jsq.jqid 
inner join apqp_questions as aq on jsq.qid = aq.qid 
left join @usersTable as uT on uT.responsible = answers.responsible 
where answers.taskAction = 1 and (uT.responsible is not null or ISNULL(@resp1, Answers.responsible) = Answers.responsible) 
order by aq.section, jsq.jobnumber, answers.priority, aq.seq 

這是我想出來的。這是醜陋的，但....

declare @resp1 nvarchar(32) 
set @resp1 = 'rrox' 
declare @filterPick int 
declare @usersTable table 
(responsible nvarchar(32)) 
insert into @usersTable (responsible) values (null) 
--insert into @usersTable (responsible) values ('ssimpson') 
--insert into @usersTable (responsible) values ('kwilcox') 
if @resp1 is null 
begin 
    set @filterPick = 2 
end 
else 
begin 
    set @filterPick = 1 
end 
select uT.responsible, jsq.jobnumber, jsq.qid, aq.question, aq.section, aq.seq, answers.* 
from answers 
inner join jobno_specific_questions as jsq on answers.jqid = jsq.jqid 
inner join apqp_questions as aq on jsq.qid = aq.qid 
left join @usersTable as uT on uT.responsible = answers.responsible 
where answers.taskAction = 1 and 
(case 
    when uT.responsible is not null then 2 
    when ISNULL(@resp1, Answers.responsible) = Answers.responsible then 1   
end = @filterPick) 
order by aq.section, jsq.jobnumber, answers.priority, aq.seq 

好吧。我想我已經明白了。我刪除了@ resp1，因爲它不是必需的，只是使用表值參數@usersTable（但在這裏我使用表變量進行測試）。我添加了一個標誌@filterPick這樣我就可以顯示@usersTable或每個記錄只值，其中answers.taskAction = 1

代碼：

declare @filterPick bit 
declare @usersTable table 
(responsible nvarchar(32)) 
insert into @usersTable (responsible) values (null) 
--insert into @usersTable (responsible) values ('ssimpson') 
--insert into @usersTable (responsible) values ('kwilcox') 
if exists (select * from @usersTable where responsible is not null) 
    begin 
     set @filterPick = 1 
    end 
else 
    begin 
     set @filterPick = 0 
    end 
select * 
from answers 
inner join jobno_specific_questions as jsq on answers.jqid = jsq.jqid 
inner join apqp_questions as aq on jsq.qid = aq.qid 
left join @usersTable as uT on answers.responsible = uT.responsible 
where answers.taskAction = 1 and (uT.responsible is not null or (isnull(uT.responsible, answers.responsible) = answers.responsible and @filterPick = 0)) 
order by aq.section, jsq.jobnumber, answers.priority, aq.seq 

Answer 1

你有沒有考慮改變WHERE子句的東西如：

WHERE Answers.taskAction = 1 
AND(ISNULL(@resp1, Answers.responsible) = Answers.responsible 
    OR Answers.responsible IN (SELECT responsible FROM uT)) 

而不是加入表值參數？

Answer 2

我有點困惑你的問題，但我會給它一個鏡頭。

首先，我懷疑你的問題與返回不正確的記錄必須做你的空值比較。爲了演示我在說什麼查詢你想要的任何表，並將其添加到最後：

WHERE null = null 

將不會返回任何記錄。在你的代碼中，我會改變：

where answers.taskAction = 1 and (uT.responsible is not null or ISNULL(@resp1, Answers.responsible) = Answers.responsible) 

到

where answers.taskAction = 1 and (uT.responsible is not null or @resp1 is null) 

，看看是否能返回所需的結果。