如何解决SQL Server-选择关键字和同义词列表
| 我有两个表： 关键词 我在其中存储唯一关键字。CREATE TABLE [dbo].[Keywords]
[KeywordID] [int] IDENTITY(1,1) NOT NULL,[Description] [varchar](200) NOT NULL
select * from Keywords
1 MVC
2 HTML
3 C#
4 ASP.NET MVC
5 MVC3
CREATE TABLE [dbo].[KeywordSynonymous]
[KeywordID] [int] NOT NULL,[KeywordSynonymousID] [int] NOT NULL
select * from KeywordSynonymous
1 5
5 4
>> if the user types \'MVC\',my sql should return \'MVC,MVC3\',\'ASP.NET MVC\'.
>> if the user types \'MVC3\',\'ASP.NET MVC\'.
>> if the user types \'ASP.NETMVC\',\'ASP.NET MVC\'.
解决方法
您绝对应该使用通用表表达式。这是解决您问题的理想解决方案，因为它不会更改您当前的数据库架构，而且最重要的是，由于
KeywordSynonymous
select * from KeywordSynonymous
1 5
5 4
select * from KeywordSynonymousAll
1 5 0
2 NULL 0
3 NULL 0
4 NULL 0
4 5 1
5 1 1
5 4 0
create view KeywordSynonymousAll as
select KeywordID,KeywordSynonymousID,0 as reversed
from KeywordSynonymous
union
select K.KeywordID,null as KeywordSynonymousID,0 as reversed
from Keywords K
where not exists(select null
from KeywordSynonymous
where KeywordID = K.KeywordID)
union
select KeywordSynonymousID,KeywordID,1 as reversed
from KeywordSynonymous
declare @search varchar(200);
set @search = \'MVC3\'; -- TEST HERE for different search keywords
with Synonymous (keywordID,SynKeywordID) as (
-- initial state: Get the keywordId and KeywordSynonymousID for the description as @search
select K.keywordID,KS.KeywordSynonymousID
from Keywords K
inner join KeywordSynonymous KS on KS.KeywordID = K.keywordId
where K.Description = @search
union all
-- also initial state but with reversed columns (because we want lookup in both directions)
select KS.KeywordSynonymousID,K.keywordID
from Keywords K
inner join KeywordSynonymous KS on KS.KeywordSynonymousID = K.keywordId
where K.Description = @search
union all
select S.SynKeywordID,KS.KeywordSynonymousID
from Synonymous S
inner join KeywordSynonymousAll KS on KS.KeywordID = S.SynKeywordID
where KS.reversed = 0 -- to avoid infinite recursion
union all
select KS.KeywordSynonymousID,S.SynKeywordID
from Synonymous S
inner join KeywordSynonymousAll KS on KS.KeywordID = S.KeywordID
where KS.reversed = 1 -- to avoid infinite recursion
)
-- finally output the result
select distinct K.Description
from Synonymous S
inner join Keywords K on K.KeywordID = S.keywordID
set @search = \'MVC3\'
ASP.NET MVC
MVC
MVC3
set @search = \'MVC\'
set @search = \'ASP.NET MVC\'
set @search = \'C#\'
set @search = \'HTML\'
-- finally output the result
select distinct T.Description
from (
select K.Description
from Synonymous S
inner join Keywords K on K.KeywordID = S.keywordID
union
select Description
from Keywords
where Description = @search) T
set @search = \'C#\'
C#
set @search = \'HTML\'
HTML
CREATE TABLE [dbo].[Keywords]
[KeywordID] [int] IDENTITY(1,1) NOT NULL,[Description] [varchar](200) NOT NULL
select * from Keywords
1 MVC
2 HTML
3 C#
4 ASP.NET MVC
5 MVC3
6 C sharp
CREATE TABLE [dbo].[KeywordSynonymity]
[SynonymityID] [int] NOT NULL,[KeywordID] [int] NOT NULL
select * from KeywordSynonymous
1 1 --- for the 1 (MVC) and 5 (MVC3)
1 5 --- being synonymous
2 3 --- for the 3 (C#) and 6 (C sharp)
2 6 --- being synonymous
MVC3
ASP.NET MVC
MVC3
C#
CREATE PROCEDURE [dbo].[AddKeyword]
@newKeyword [varchar](200),@synonymKeyword [varchar](200) = NULL
AS
BEGIN
SET NOCOUNT ON;
set transaction isolation level serializable
begin transaction
if EXISTS (select 1 from Keywords where [Description] = @newKeyword)
begin
commit transaction
return
end
declare @masterKeywordId int
select
@masterKeywordId = ISNULL(KeywordSynonymous.KeywordID,Keywords.KeywordID)
from
Keywords
left join
KeywordSynonymous
on
Keywords.KeywordID = KeywordSynonymous.KeywordSynonymousID
where
[Description] = @synonymKeyword
insert into Keywords VALUES (@newKeyword)
if @masterKeywordId is not null
insert into KeywordSynonymous VALUES (@masterKeywordId,SCOPE_IDENTITY())
commit transaction
END
CREATE PROCEDURE [dbo].[GetSynonymKeywords]
@keyword [varchar](200)
AS
BEGIN
SET NOCOUNT ON;
declare @masterKeywordId int
select
@masterKeywordId = ISNULL(KeywordSynonymous.KeywordID,Keywords.KeywordID)
from
Keywords
left join
KeywordSynonymous
on
Keywords.KeywordID = KeywordSynonymous.KeywordSynonymousID
where
[Description] = @keyword
select
KeywordId,[Description]
from
Keywords
where
KeywordId = @masterKeywordId
union
select
Keywords.KeywordId,[Description]
from
KeywordSynonymous
join
Keywords
on
KeywordSynonymous.KeywordSynonymousID = Keywords.KeywordId
where
KeywordSynonymous.KeywordId = @masterKeywordId
END
EXEC [dbo].[AddKeyword] @newKeyword = N\'MVC\'
EXEC [dbo].[AddKeyword] @newKeyword = N\'ASP.NET MVC\',@synonymKeyword = \'MVC\'
EXEC [dbo].[AddKeyword] @newKeyword = N\'MVC3\',@synonymKeyword = \'ASP.NET MVC\'
[dbo].[GetSynonymKeywords] @keyword = N\'MVC3\'
[dbo].[GetSynonymKeywords] @keyword = N\'ASP.NET MVC\'
[dbo].[GetSynonymKeywords] @keyword = N\'MVC3\'
DECLARE @TempKeywordID TABLE (KeywordID int)
INSERT INTO @TempKeywordID (KeywordID)(select KeywordID from Keywords where [Description] = @SearchKeyword)
DECLARE @intFlag INT
SET @intFlag = 1
WHILE (@intFlag <=(Select Count(KeywordSynonymousID) from KeywordSynonymous)) --Loop for all records in KeywordSynonymous
BEGIN
INSERT INTO @TempKeywordID (KeywordID)(Select KeywordSynonymousID from KeywordSynonymous where KeywordID in (Select KeywordID from @TempKeywordID))
INSERT INTO @TempKeywordID (KeywordID)(Select KeywordID from KeywordSynonymous where KeywordSynonymousID in (Select KeywordID from @TempKeywordID))
SET @intFlag = @intFlag + 1
END
SELECT * FROM Keywords WHERE KeywordID IN (SELECT * FROM @TempKeywordID)
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