Question

我有3种方法可以过滤：

按名称
by list
并显示所有

我正在使用ASP.NET 3.5和SQL Server 2008.使用ADO.NET和存储过程。

我将我的列表作为表值参数传递（但我正在使用表变量进行测试）并将名称作为nvarchar传递。我有“显示所有”作为ISNULL（@ var，column）=列。显然，我查询的方式并不是利用短路或我对WHERE子句如何工作的理解缺乏。发生的事情是，如果我将@var ='some string'并将null插入表变量，那么它会正确过滤。如果我将@var = null并将'some string'插入表变量，那么我得到每条记录，我应该得到'some string'。

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

这就是我想出来的。虽然很难看......

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

确定。我想我已经明白了。我删除了@resp1，因为它没有必要，我只是使用表值参数@usersTable（但在这里我使用表变量进行测试）。我添加了一个标志@filterPick，所以我只能在@usersTable中显示值，或者每个记录都显示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

我对你的问题感到有些困惑，但我会试一试。

首先，我怀疑您返回错误记录的问题与您的空值比较有关。为了演示我在说什么，查询你想要的任何表，并将其添加到结尾：

WHERE null = null

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)

看看是否会返回所需的结果。

Answer 2

您是否考虑过将WHERE子句更改为：

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

而不是在表值参数上加入？

我的查询过滤工作方式不符合我的要求

2 个答案: