我查询过滤不工作，我希望它

Question

的方式，我有3个方面，我想过滤：

按名称

2. 通过列表
3. 并显示所有

我使用ASP.NET 3.5和SQL Server 2008.使用ADO.NET和存储特效。

我传递我的列表作为表值参数（但我正在测试一个表变量）和名称作为nvarchar。我有“全部显示”为ISNULL（@var，column）=列。很明显，我查询的方式没有利用短路或我对WHERE子句缺乏工作的理解。发生什么事情是，如果我使@var ='一些字符串'并向表变量插入一个空值，那么它会正确过滤。如果我使@var = null并向表变量中插入'一些字符串'，那么我得到每一条记录，我应该得到'一些字符串'。

代码：

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 

这是我想出来的。这是丑陋的，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。我想我已经明白了。我删除了@ resp1，因为它不是必需的，只是使用表值参数@usersTable（但在这里我使用表变量进行测试）。我添加了一个标志@filterPick这样我就可以显示@usersTable或每个记录只值，其中answers.taskAction = 1

代码：

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

你有没有考虑改变WHERE子句的东西如：

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

而不是加入表值参数？

Answer 2

我有点困惑你的问题，但我会给它一个镜头。

首先，我怀疑你的问题与返回不正确的记录必须做你的空值比较。为了演示我在说什么查询你想要的任何表，并将其添加到最后：

WHERE null = null 

将不会返回任何记录。在你的代码中，我会改变：

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结果。