System.Versionを SQL Serverに格納する最良の方法は何ですか?
varchar 型を使用すると、asc による順序の結果は次のようになります。
1.0.0.0
11.0.0.0
12.0.0.0
2.0.0.0
5763 次
3 に答える
11
varchar 列を使用できます
このように注文できます
SELECT *
FROM t_version
ORDER BY CAST('/' + vid + '/' AS HIERARCHYID)
SQL フィドルは今日は機能していません。それ以外の場合は、デモを表示できたはずです
テストのためにこれを実行してください
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)
于 2012-10-17T11:58:28.370 に答える
7
通常の varchar として保存するだけです。これは、PARSENAME を使用して文字列を分割し、4 つの個別の列で並べ替える最大 4 つの部分のバージョンに適しています。
すなわち
ORDER BY PARSENAME(version,4),
PARSENAME(version,3),
PARSENAME(version,2),
PARSENAME(version,1)
于 2012-10-17T11:58:46.483 に答える
0
長さが混在するバージョン (例: '1.2' と '1.2.3.4') 間の順序付けをサポートするために、10 進数へのマッピングを (インライン テーブル値関数として) 実行できます。
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
依存：
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
于 2015-08-24T22:01:01.700 に答える