SQL 到 EF Core linq 查询FREETEXTTABLE、连接、排名

问题描述

我刚开始使用 sql Server 自由文本索引。我编写了一个查询，希望将其转换为 EF Core Linq 查询。

如果可能的话，我不是（如果不是，我将创建一个存储过程），但理想情况下，我想在 C# 中构造它，因为其他一些查询会更多动态比这一个，而 id 而不是有多个存储过程。

这是查询：

declare @searchTerm varchar(50) = '16 Sorrento';
declare @postcode varchar(50) = 'CF10 4AR';
declare @language varchar(3) = 'ENG';
declare @offset int = 0;
declare @limit int = 100;

select 
    RankTotal = isnull(RankSAONDetails,0) + isnull(RankPAONDetails,0) + 
                isnull(RankStreet,0) + isnull(RankWard,0) + 
               isnull(RankPostcode,0),Id,UPRN,ParentUPRN,USRN,SAONDetails,PAONDetails,Street,Ward,PostTown,Postcode,Easting,northing,Usage,Language,LastUpdateDate,DateExtracted
from
    LLPG
left join 
    (select Rank * 3.0 as RankSAONDetails,[KEY] 
     from freetexttable(LLPG,@searchTerm)) as k on k.[key]= LLPG.Id
left join 
    (select Rank * 4.0 as RankPAONDetails,@searchTerm)) as l on l.[key]= LLPG.Id
left join 
    (select Rank * 3.0 as RankStreet,@searchTerm)) as m on m.[key]= LLPG.Id
left join 
    (select Rank * 3.0 as RankWard,@searchTerm)) as w on w.[key]= LLPG.Id
left join 
    (select Rank * 10.0 as RankPostcode,@searchTerm)) as p on p.[key]= LLPG.Id
where
    LLPG.Language = @language and
    StatusCode = 1 and
    LPIStatusCode = 1 and
    Usage LIKE 'Res%' and
    Replace(Postcode,' ','') = Replace(@postcode,'') and
    (RankSAONDetails is not null or
     RankPAONDetails is not null or
     RankStreet is not null or
     RankWard is not null or
     RankPostcode is not null)
order by
    RankTotal desc
offset @offset rows
    fetch next @limit rows only

解决方法

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