Kiểu dữ liệu cho System.Version trong máy chủ sql

Question

Cách tốt nhất để lưu trữ System.Version trong SQL Server là gì?

Khi tôi sử dụng loại varchar, kết quả của trật tự bởi asc là:

1.0.0.0 
11.0.0.0 
12.0.0.0 
2.0.0.0 

Answer 1

bạn có thể sử dụng một cột VARCHAR

bạn có thể đặt hàng như

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

SQL fiddle này không làm việc ngày hôm nay, khôn ngoan khác tôi có thể đã cho thấy một bản demo

Hãy chạy thử nghiệm này để kiểm tra 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

Chỉ lưu nó dưới dạng varchar bình thường, tốt cho phiên bản lên đến 4 phần sử dụng PARSENAME để chia chuỗi và thứ tự theo 4 cột riêng biệt.

ví dụ:

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

Answer 3

Để hỗ trợ đặt hàng giữa các độ dài phiên bản (ví dụ '1.2' vs '1.2.3.4') hỗn hợp, một ánh xạ đến một chữ số thập phân có thể được thực hiện (như các chức năng bảng nội tuyến có giá trị).

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 

phụ thuộc:

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 

So sánh:

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