SQL服務器中的System.Version的數據類型

Question

將System.Version存儲在SQL Server中的最佳方式是什麼？

當我通過ASC使用VARCHAR類型，結果的順序是：

1.0.0.0 
11.0.0.0 
12.0.0.0 
2.0.0.0 

Answer 1

可以使用VARCHAR列

你可以命令這樣

SELECT * 
FROM t_version 
ORDER BY CAST('/' + vid + '/' AS HIERARCHYID) 

SQL小提琴不今天工作，其他明智的我可以展示一個演示

請運行此測試荷蘭國際集團

SELECT * FROM 
(VALUES 
     ('1.0.0.0'), 
     ('11.0.0.0'), 
     ('12.0.0.0'), 
     ('2.0.0.0')) AS vid (vid) 
ORDER BY CAST('/' + vid + '/' AS HIERARCHYID) 

Answer 2

僅有

其存儲爲一個正常的VARCHAR，這是良好的版本到4份使用PARSENAME拆分由4個獨立的列中的字符串和順序。

即

ORDER BY PARSENAME(version,4), 
     PARSENAME(version,3), 
     PARSENAME(version,2), 
     PARSENAME(version,1) 

Answer 3

爲了支持混合長度的版本（例如「1.2」 VS「1.2.3.4」）之間的排序，映射到一個小數可以執行（如內聯表值函數）。

create function Common.ufn_OrderableVersion(@pVersion nvarchar(100)) 
returns table 
as 
/*--------------------------------------------------------------------------------------------------------------------- 
    Purpose: Provide a mapping from Versions of the form 'a.b.c.d', 'a.b.c, 'a.b', 'a', null to 
       an orderable decimal(25, 0) 

       Since Parsename() doesn't apply easily to mixed length comparisions (1.2 vs 1.2.3.4) 

Test Cases: 
       select * from Common.ufn_OrderableVersion(null);  -- null 
       select * from Common.ufn_OrderableVersion('0');  -- 1000000000000000000000000 
       select * from Common.ufn_OrderableVersion('1');  -- 1000001000000000000000000 
       select * from Common.ufn_OrderableVersion('1.2.3.4'); -- 1000001000002000003000004 

       select Version 
       from 
        (
         select '1.3.5.3' as Version 
         union all 
         select '1.2.5.3' as Version 
         union all 
         select '1.1.5.3' as Version 
         union all 
         select '1.3.5.2' as Version 
         union all 
         select null as Version 
         union all      
         select '' as Version 
         union all 
         select '2' as Version 
         union all 
         select '1.2' as Version 
         union all 
         select '1' as Version      
        ) v 
       order by (select Value from Common.ufn_OrderableVersion(Version)) 

    Modified By    Description 
    ---------- -------------- --------------------------------------------------------------------------------------- 
    2015.08.24 crokusek  Initial Version 
    ---------------------------------------------------------------------------------------------------------------------*/ 
return   
    -- 25 = 1 + VersionPositions * MaxDigitsPerSegment 
    select convert(decimal(25,0), '1' + 
      stuff((select format(Value, '000000') 
        from 
         (
          select convert(int, Value) as Value, RowNumber 
           -- Support empty string and partial versions. Null maps to null 
          from Common.ufn_SplitUsingXml(@pVersion + '.0.0.0.0', '.') -- pad right 
          where RowNumber <= 4 -- trim right 
         ) as v 
        order by RowNumber 
        for xml path ('') 
       ), 1, 0, '') 
      ) as Value 
go 

相關性：

create function Common.ufn_SplitUsingXml 
(
    @pList  nvarchar(max), 
    @pDelimiter nvarchar(255) 
) 
returns table 
as 
/*--------------------------------------------------------------------------------------------------------------------- 
    Purpose: Split an Identifier using XML as an inline table valued function. 
       Using the SQL Server CLR (C#) capability would be the most efficient way to support this. 

    Warnings: Will not work if the input contains special XML characters like '<', '>' or '&'. 
       Caller must add "option (maxrecursion 0)" for lists greater than 100 (it can't be added within the ufn)     

    Modified By    Description 
    ---------- -------------- --------------------------------------------------------------------------------------- 
    2015.08.24 inet   http://sqlperformance.com/2012/07/t-sql-queries/split-strings 
    ---------------------------------------------------------------------------------------------------------------------*/ 
return 
( 
    select Value = y.i.value('(./text())[1]', 'nvarchar(4000)'), 
     row_number() over (order by (select null)) as RowNumber 
    from 
    ( 
    select x = convert(XML, '<i>' 
     + replace(@pList, @pDelimiter, '</i><i>') 
     + '</i>').query('.') 
) AS a cross apply x.nodes('i') AS y(i) 
    -- option (maxrecursion 0) must be added by caller for lists greater than 100 
); 
go 

比較：

alter function Common.ufn_CompareVersions 
(
    @pVersionA nvarchar(100), 
    @pVersionB nvarchar(100) 
) 
returns table 
as 
/*--------------------------------------------------------------------------------------------------------------------- 
    Purpose: Compare Version of the form 'A.B.C.D'. 
       Comparing versions of different lengths is also supported 'A.B'. 

Test Cases: 
       select Result from Common.ufn_CompareVersions('1', null) -- 1 
       select Result from Common.ufn_CompareVersions(null, '1') -- -1 
       select Result from Common.ufn_CompareVersions('1', '1') -- 0 
       select Result from Common.ufn_CompareVersions('1', '2') -- -1 
       select Result from Common.ufn_CompareVersions('2', '1') -- 1 
       select Result from Common.ufn_CompareVersions('1', '1.2') -- -1 
       select Result from Common.ufn_CompareVersions('1.2', '1') -- 1 
       select Result from Common.ufn_CompareVersions('1.2.3.4', '1.2.3.4') -- 0 
       select Result from Common.ufn_CompareVersions('1.2.3', '1.2.3.4') -- -1 
       select Result from Common.ufn_CompareVersions('1.2.3.4', '1.2.3') -- 1 
       select Result from Common.ufn_CompareVersions('1.9.3.4', '1.2.3.4') -- 1 
       select Result from Common.ufn_CompareVersions('1.2.3.4', '1.9.3.4') -- -1 
       select Result from Common.ufn_CompareVersions('1.002', '1.2') -- 0 
       select Result from Common.ufn_CompareVersions('1.2', '1.2.0') -- 0 

    Modified By   Description 
    ---------- ----------- ------------------------------------------------------------------------------------------ 
    2015.08.24 crokusek  Initial Version 
    ---------------------------------------------------------------------------------------------------------------------*/ 
return  
    with Compares as 
    (
     select (select IsNull(Value, 0) from Common.ufn_OrderableVersion(@pVersionA)) as A, 
      (select IsNull(Value, 0) from Common.ufn_OrderableVersion(@pVersionB)) as B 
    ) 
    select case when A > B then 1 
       when A < B then -1 
       else 0 
      end as Result 
     from Compares 
go