Tipo di dati per System.Version in sql server

Question

Qual è il modo migliore per memorizzare System.Version in SQL Server?

Quando uso tipo varchar, frutto di ordine per asc è:

1.0.0.0 
11.0.0.0 
12.0.0.0 
2.0.0.0 

Answer 1

è possibile utilizzare una colonna varchar

si poteva ordinare come questo

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

SQL violino non è lavorando oggi, altrimenti avrei potuto mostrare una demo

Si prega di eseguire questo per test ing

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

Proprio conservarlo come un varchar normale, che è buono per le versioni fino a 4 parti utilizzando ParseName di dividere la stringa e l'ordine da 4 colonne separate.

cioè

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

Answer 3

Sostenere ordinamento tra versioni lunghezze miste (ad esempio '1,2' vs '1.2.3.4'), una mappatura per un decimale può essere eseguita (come funzioni a valori di tabella in linea).

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 

Dipendenza:

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 

Confronto:

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