sql server中System.Version的数据类型

Question

在SQL Server中存储System.Version的最佳方法是什么？

当我使用varchar类型时，asc的顺序结果是：

1.0.0.0
11.0.0.0
12.0.0.0
2.0.0.0

Answer 1

你可以使用varchar列

你可以点这样订购

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

SQL小提琴今天不起作用，其他明智的我可以展示一个演示

请运行此测试

 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

只需将其存储为普通varchar，这适用于最多4个部分的版本，使用PARSENAME将字符串拆分并按4个单独的列排序。

即

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

Answer 3

为了支持混合长度版本之间的排序（例如'1.2'与'1.2.3.4'），可以执行到十进制的映射（作为内联表值函数）。

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

相关性：

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

比较：

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