想要通过 SQL/TSQL 获得与我通过 LINQ 查询获得的相同的输出

Question

我使用 LINQ 查询数据进行排序，我得到了正确的答案。

这是我的数据和 linq 查询......请看看。

void Main()
{
List<SearchResult> list = new List<SearchResult>() {
    new SearchResult(){ID=1,Title="Geo Prism GEO 1995 GEO* - ABS #16213899"},
    new SearchResult(){ID=2,Title="Excavator JCB - ECU P/N: 728/35700"},
    new SearchResult(){ID=3,Title="Geo Prism GEO 1995 - ABS #16213899"},
    new SearchResult(){ID=4,Title="JCB Excavator JCB- ECU P/N: 728/35700"},
    new SearchResult(){ID=5,Title="Geo Prism GEO,GEO 1995 - ABS #16213899 GEO"},
    new SearchResult(){ID=6,Title="dog"},
};

var to_search = new[] { "Geo", "JCB" }.Select(x => x.ToLower()).ToArray();

var result = from searchResult in list
let title = searchResult.Title.ToLower()
let key_string = to_search.FirstOrDefault(ts =>  title.Contains(ts))
orderby key_string == null ? -1 :  title.Split(new[]  { key_string },  StringSplitOptions.None).Length descending 
group searchResult by key_string into Group
    orderby Group.Count() descending
select Group;

result.Dump();

}

public class SearchResult
{
public int ID { get; set; }
public string Title { get; set; }
}

我的问题是我需要编写什么 sql 查询，因此我将在 sql server 2000 中获得相同的输出。 假设我的数据是这样存储在 sql server 表中的

Table : MyTable
------------------
ID  Title
-----------
1   Geo Prism GEO 1995 GEO* - ABS #16213899
2   Excavator JCB - ECU P/N: 728/35700
3   Geo Prism GEO 1995 - ABS #16213899
4   JCB Excavator JCB- ECU P/N: 728/35700
5   Geo Prism GEO,GEO 1995 - ABS #16213899 GEO
6   Maruti gear box #ABS 4587

我的编辑

我修复了你的 sql 中的一些语法问题....看看

CREATE FUNCTION [dbo].[Split] (@String varchar(8000), @Delimiter char(1))     
returns @temptable TABLE (items varchar(8000))       
as       
begin       
   declare @idx int       
    declare @slice varchar(8000)       

    select @idx = 1       
        if len(@String)<1 or @String is null  return       

   while @idx!= 0       
   begin       
       set @idx = charindex(@Delimiter,@String)       
       if @idx!=0       
           set @slice = left(@String,@idx - 1)       
       else       
          set @slice = @String       

       if(len(@slice)>0)  
           insert into @temptable(Items) values(@slice)       

       set @String = right(@String,len(@String) - @idx)       
       if len(@String) = 0 break       
   end   
return       
end

DECLARE @Sterm varchar(MAX) 
SET @Sterm ='GEO JCB'
;WITH SearchResult (rnum, title)
as 
(   
(select 1 as rnum,'Geo Prism GEO 1995 GEO* - ABS #16213899' as title)
union all
(select 2 as rnum,'Excavator JCB - ECU P/N: 728/35700' as title)
union all
(select 3 as rnum,'Geo Prism GEO 1995 - ABS #16213899' as title)
union all
(select 4 as rnum,'JCB Excavator JCB- ECU P/N: 728/35700' as title)
union all
(select 5 as rnum,'Geo Prism GEO,GEO 1995 - ABS #16213899 GEO' as title)
union all
(select 6 as rnum,'dog' as title)
) 

select rnum, title from SearchResult
join 
( select lower(Items) as term 
  from dbo.Split(@Sterm , ' ')
) as search_terms
on lower(SearchResult.title) like '%' + search_terms.term +'%'
order by 
search_terms.term,
(select count(*)
from dbo.Split(lower(SearchResult.title),' ')
where Items = search_terms.term
) desc 

但这并不能完全满足我的要求。

1) 查询应该返回搜索词以及那些与搜索词无关的行。

2) 第二个排序应该在那里，就像那些行将排在最前面，其中搜索词找到了最长时间，如 GEO 和 JCB。

你会根据搜索词的出现按降序错过第二个订单。如果你看得很清楚，那么你可以看到我在这里问的是什么类型的输出。谢谢。

Answer 1

使用SQL Server Profiler 获取正在运行的查询。

Answer 2

您不能仅使用 SQL 来完成。您将需要一个存储例程将标题字符串拆分为子字符串，然后 SQL 可以计算与您的搜索匹配的子字符串。

CREATE FUNCTION [dbo].[Split] (@String varchar(8000), @Delimiter char(1))     
returns @temptable TABLE (items varchar(8000))       
as       
begin       
  declare @idx int       
  declare @slice varchar(8000)       

  select @idx = 1       
    if len(@String)<1 or @String is null  return       

  while @idx!= 0       
  begin       
    set @idx = charindex(@Delimiter,@String)       
    if @idx!=0       
       set @slice = left(@String,@idx - 1)       
    else       
       set @slice = @String       

    if(len(@slice)>0)  
      insert into @temptable(Items) values(@slice)       

      set @String = right(@String,len(@String) - @idx)       
      if len(@String) = 0 break       
    end   
  return       
end

DECLARE @Sterm varchar(MAX) 
SET @Sterm ='GEO JCB'
;WITH SearchResult (rnum, title)
as 
(   
    (select 1 as rnum,'Geo Prism GEO 1995 GEO* - ABS #16213899' as title)
    union all
    (select 2 as rnum,'Excavator JCB - ECU P/N: 728/35700' as title)
    union all
    (select 3 as rnum,'Geo Prism GEO 1995 - ABS #16213899' as title)
    union all
    (select 4 as rnum,'JCB Excavator JCB- ECU P/N: 728/35700' as title)
    union all
    (select 5 as rnum,'Geo Prism GEO,GEO 1995 - ABS #16213899 GEO' as title)
    union all
    (select 6 as rnum,'dog' as title)
) 
select term,rnum, title
  from SearchResult
  left join 
     ( select lower(Items) as term 
         from dbo.Split(@Sterm,' ')
  ) as search_terms
  on lower(SearchResult.title) like '%' + search_terms.term +'%'
order by 
  isnull(search_terms.term,'ZZZZZZZZZZZZZ'),
  (select count(*)
     from dbo.Split(lower(SearchResult.title),search_terms.term)
  ) desc, 
  rnum desc

Answer 3

您可以使用 LINQ 特性来抓取 SQL 查询：

var ctx = new SomeDbDataContext();
var sw = new StringWriter();
ctx.Log = sw;

var items = from item in ctx.INVENTTABLEs
            where item.ITEMID.Length < 10
            select item;

foreach (var item in items)
{
   Console.WriteLine("{0}", item.ITEMID);
}

Console.WriteLine(sw.GetStringBuilder().ToString());
Console.ReadLine();