基于 SQL 条件的搜索，不适用于 AND 条件

Question

我正在实现搜索操作（通过存储过程进行客户端搜索） 我有一个“Nvarchar”类型列“ArticleHeader”和一个“DATE”列“DateEffective” 我通过 @operator 执行基于条件的搜索， 对于闲置的 sn-p，我正在尝试在连词 (AND) 中搜索日期和文章标题 我没有得到任何结果，但是如果我单独运行它们，它们效果很好。

找到sn-p：

CREATE TABLE #TempItems
(
    DateEffective DATE,
    ArticleHeader NVARCHAR(50)
)

insert into #TempItems values ('2019-12-28','Nieuws')
insert into #TempItems values ('2020-02-12','Test')
insert into #TempItems values ('2020-01-10','zolo')
insert into #TempItems values ('2020-02-23','valued')

declare @DateEffective datetime,@operator nvarchar(10)
--set @DateEffective ='2020-01-10'
set @operator='neq'
declare @ArticleHeader nvarchar (50) ='Nieuws'

select * from #TempItems PA
Where 1=1
--------------------------------------------------------------------
And
(
(
(@operator='neq') And
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE convert(date,PA.DateEffective) 
END !=
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE Convert(Date, @DateEffective)
End
)
OR
(
(@operator='eq') And
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE convert(date,PA.DateEffective) 
END =
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE Convert(Date, @DateEffective)
End
)
)
----------------------------------------------------------------------
AND
(
(lower(@Operator) = 'eq' AND 
CASE WHEN @ArticleHeader IS NULL
            THEN '1'
            ELSE PA.ArticleHeader
      END =
      CASE WHEN @ArticleHeader IS NULL
                    THEN '1'
                    ELSE CONVERT(nvarchar(1000), @ArticleHeader)
      END
)
OR
(lower(@Operator) = 'startswith' AND 
CASE WHEN @ArticleHeader IS NULL
            THEN '1'
            ELSE PA.ArticleHeader
      END Like 
      CASE WHEN @ArticleHeader IS NULL
                    THEN '1'
                    ELSE CONVERT(nvarchar(1000), @ArticleHeader) + '%'
      END
)
)
---------------------------------------------------------------------------

Answer 1

您好@Azhar，请您检查一下这个查询，它在两种情况下都可以正常工作。

DROP TABLE IF EXISTS #TempItems

CREATE TABLE #TempItems
(
    DateEffective DATE,
    ArticleHeader NVARCHAR(50)
)

insert into #TempItems values ('2019-12-28','Nieuws')
insert into #TempItems values ('2020-02-12','Test')
insert into #TempItems values ('2020-01-10','zolo')
insert into #TempItems values ('2020-02-23','valued')
insert into #TempItems values ('2020-02-24','Nieuws')

declare @DateEffective datetime,@operator nvarchar(10)
set @DateEffective ='2020-01-10'
set @operator='startswith'
declare @ArticleHeader nvarchar (50) ='Nieuws'

select * from #TempItems PA
Where 1=1
--------------------------------------------------------------------
And
(
(
(@operator='neq') And
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE convert(date,PA.DateEffective) 
END !=
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE Convert(Date, @DateEffective)
End
)
OR
(
(@operator='eq') And
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE convert(date,PA.DateEffective) 
END =
CASE WHEN @DateEffective IS NULL 
THEN '1900-1-1' 
ELSE Convert(Date, @DateEffective)
End
)
OR
(
    1=1
)
)
------------------------------------------------------------------------
AND
(
(lower(@Operator) = 'eq' AND 
CASE WHEN @ArticleHeader IS NULL
            THEN '1'
            ELSE PA.ArticleHeader
      END =
      CASE WHEN @ArticleHeader IS NULL
                    THEN '1'
                    ELSE CONVERT(nvarchar(1000), @ArticleHeader)
      END
)
OR
(lower(@Operator) = 'startswith' AND 
CASE WHEN @ArticleHeader IS NULL
            THEN '1'
            ELSE PA.ArticleHeader
      END Like 
      CASE WHEN @ArticleHeader IS NULL
                    THEN '1'
                    ELSE CONVERT(nvarchar(1000), @ArticleHeader) + '%'
      END
)
OR
(lower(@Operator) = 'neq' AND 
CASE WHEN @ArticleHeader IS NULL
            THEN '1'
            ELSE PA.ArticleHeader
      END <> 
      CASE WHEN @ArticleHeader IS NULL
                    THEN '1'
                    ELSE CONVERT(nvarchar(1000), @ArticleHeader) 
      END
)
)
---------------------------------------------------------------------------

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