ОБНОВЛЕНО (20200226)
Было несколько замечаний, что решение CLR / regex может быть быстрее, чем решение ngram8k, которое я опубликовал. Я слышал это в течение шести лет, но каждый раз, без исключения, тестовая система рассказывает другую историю. Я уже разместил в предыдущих комментариях инструкции по запуску семейства CLR Regex от Microsoft © MDQ всего за несколько минут. Они были разработаны, протестированы и настроены Microsoft и поставляются с Master Data Services / Data Quality Services. Я использовал их годами, они хороши.
RegexReplace / RegexSplit против PatExtract8k / DigitsOnlyEE: 1 000 000 строк
Очевидно, вы не хотите использовать функции в предложении WHERE, но, поскольку мой Regex является ржавым AF, мне нужно было. Чтобы выровнять игровое поле, я проделал то же самое с DigitsOnlyEE в предложении WHERE решения N-Gram.
SET NOCOUNT ON;
DBCC FREEPROCCACHE WITH NO_INFOMSGS;
DBCC DROPCLEANBUFFERS WITH NO_INFOMSGS;
SET STATISTICS TIME ON;
DECLARE
@newData BIT = 0,
@string VARCHAR(8000) = '1) Call back from +79005346546, Conversation started<br>Phone: +79005346546<br>Called twice Came from google.com<br>IP: 77.106.46.202 the web page address is xxx.com utm_medium: cpc<br>utm_campaign: 32587871<br>utm_content: 5283041 79005346546 ',
@pattern VARCHAR(50) = '[^0-9()+.-]',
@srchLen INT = 11;
IF @newData = 1
BEGIN
IF OBJECT_ID('tempdb..#strings','U') IS NOT NULL DROP TABLE #strings;
SELECT
StringId = IDENTITY(INT,1,1),
String = REPLICATE(@string,ABS(CHECKSUM(NEWID())%3)+1)
INTO #strings
FROM dbo.rangeAB(1,1000000,1,1) AS r;
END
PRINT CHAR(10)+'Regex/CLR version Serial'+CHAR(10)+REPLICATE('-',90);
SELECT regex.NewString
FROM #strings AS s
CROSS APPLY
(
SELECT STRING_AGG(clr.RegexReplace(f.Token,'[^0-9]','',0),' ')
FROM clr.RegexSplit(s.string,@pattern,N'[0-9()+.-]',0) AS f
WHERE f.IsValid = 1
AND LEN(clr.RegexReplace(f.Token,'[^0-9]','',0)) = @srchLen
) AS regex(NewString);
PRINT CHAR(10)+'NGrams version Serial'+CHAR(10)+REPLICATE('-',90);
SELECT ngramsStuff.NewString
FROM #strings AS s
CROSS APPLY
(
SELECT STRING_AGG(ee.digitsOnly,' ')
FROM samd.patExtract8K(@string,@pattern) AS pe
CROSS APPLY samd.digitsOnlyEE(pe.item) AS ee
WHERE LEN(ee.digitsOnly) = @srchLen
) AS ngramsStuff(NewString)
OPTION (MAXDOP 1);
SET STATISTICS TIME OFF;
GO
Результаты теста
Regex/CLR version Serial
------------------------------------------------------------------------------------------
SQL Server Execution Times: CPU time = 19918 ms, elapsed time = 12355 ms.
NGrams version Serial
------------------------------------------------------------------------------------------
SQL Server Execution Times: CPU time = 844 ms, elapsed time = 971 ms.
NGrams8k очень быстрый, не требует компиляции новой сборки, изучения нового языка программирования, включения функций CLR , et c ... Нет проблем со сборкой мусора. Даже функция CLR N-GRAM, которая поставляется с MDS / DQS, не может коснуться производительности NGrams8k (см. Комментарии под моей статьей).
КОНЕЦ ОБНОВЛЕНИЯ
Сначала возьмите копию ngrams8k и используйте ее для сборки PatExtract8k (DDL ниже в нижней части этого поста.) Далее быстро прогрев:
DECLARE
@string VARCHAR(8000) = 'Call me later at 222-3333 or tomorrow at 312.555.2222,
(313)555-6789, or at 1+800-555-4444 before noon. Thanks!',
@pattern VARCHAR(50) = '%[^0-9()+.-]%';
SELECT pe.itemNumber, pe.itemIndex, pe.itemLength, pe.item
FROM samd.patExtract8K(@string,@pattern) AS pe
WHERE pe.itemLength > 1;
Возвращает:
ItemNumber ItemIndex ItemLength Item
----------- ----------- ----------- ----------------
1 18 8 222-3333
2 42 12 312.555.2222
3 91 13 (313)555-6789
4 112 14 1+800-555-4444
Обратите внимание, что функция возвращает совпавший шаблон, позицию в строке, длину элемента и предмет. Первые три атрибута могут быть использованы для дальнейшей обработки, что приводит нас к вашему сообщению. Обратите внимание на мои комментарии:
-- First for some easily consumable sample data.
DECLARE @things TABLE (StringId INT IDENTITY, String VARCHAR(8000));
INSERT @things (String)
VALUES
('Call back from +79005346546, Conversation started<br>Phone: +79005346546<br>Called twice Came from google.com<br>IP: 77.106.46.202 the web page address is xxx.com utm_medium: cpc<br>utm_campaign: 32587871<br>utm_content: 5283041 79005346546 '),
('John Smith'),
('xxx@yyy.com'),
('John Smith 8 999 888 77 77');
DECLARE @SrchLen INT = 11;
SELECT
StringId = t.StringId,
ItemIndex = pe.itemIndex,
ItemLength = @SrchLen,
Item = i2.Item
FROM @things AS t
CROSS APPLY samd.patExtract8K(t.String,'[^0-9 ]') AS pe
CROSS APPLY (VALUES(PATINDEX('%'+REPLICATE('[0-9]',@SrchLen), pe.item))) AS i(Idx)
CROSS APPLY (VALUES(SUBSTRING(pe.Item,NULLIF(i.Idx,0),11))) AS ns(NewString)
CROSS APPLY (VALUES(ISNULL(ns.NewString, REPLACE(pe.item,' ','')))) AS i2(Item)
WHERE pe.itemLength >= @SrchLen;
Возвращает:
StringId ItemIndex ItemLength Item
----------- -------------------- ----------- -----------
1 17 11 79005346546
1 62 11 79005346546
1 221 11 79005346546
4 11 11 89998887777
Далее мы можем обрабатывать внешние строки, такие как и строка-столбец конкатенация, как это:
WITH t AS
(
SELECT i2.Item, t.StringId
FROM @things AS t
CROSS APPLY samd.patExtract8K(t.String,'[^0-9 ]') AS pe
CROSS APPLY (VALUES(PATINDEX('%'+REPLICATE('[0-9]',@SrchLen), pe.item))) AS i(Idx)
CROSS APPLY (VALUES(SUBSTRING(pe.Item,NULLIF(i.Idx,0),11))) AS ns(NewString)
CROSS APPLY (VALUES(ISNULL(ns.NewString, REPLACE(pe.item,' ','')))) AS i2(Item)
WHERE pe.itemLength >= @SrchLen
)
SELECT
StringId = t2.StringId,
NewString = ISNULL((
SELECT t.item+' '
FROM t
WHERE t.StringId = t2.StringId
FOR XML PATH('')),'')
FROM @things AS t2
LEFT JOIN t AS t1 ON t2.StringId = t1.StringId
GROUP BY t2.StringId;
Возвращает:
StringId NewString
--------- --------------------------------------
1 79005346546 79005346546 79005346546
2
3
4 89998887777
У меня будет sh У меня было немного больше времени для дополнительных деталей, но это заняло немного больше времени тогда запланировано. Любые вопросы приветствуются.
Patextract:
CREATE FUNCTION samd.patExtract8K
(
@string VARCHAR(8000),
@pattern VARCHAR(50)
)
/*****************************************************************************************
[Description]:
This can be considered a T-SQL inline table valued function (iTVF) equivalent of
Microsoft's mdq.RegexExtract except that:
1. It includes each matching substring's position in the string
2. It accepts varchar(8000) instead of nvarchar(4000) for the input string, varchar(50)
instead of nvarchar(4000) for the pattern
3. The mask parameter is not required and therefore does not exist.
4. You have specify what text we're searching for as an exclusion; e.g. for numeric
characters you should search for '[^0-9]' instead of '[0-9]'.
5. There is is no parameter for naming a "capture group". Using the variable below, both
the following queries will return the same result:
DECLARE @string nvarchar(4000) = N'123 Main Street';
SELECT item FROM samd.patExtract8K(@string, '[^0-9]');
SELECT clr.RegexExtract(@string, N'(?<number>(\d+))(?<street>(.*))', N'number', 1);
Alternatively, you can think of patExtract8K as Chris Morris' PatternSplitCM (found here:
http://www.sqlservercentral.com/articles/String+Manipulation/94365/) but only returns the
rows where [matched]=0. The key benefit of is that it performs substantially better
because you are only returning the number of rows required instead of returning twice as
many rows then filtering out half of them. Furthermore, because we're
The following two sets of queries return the same result:
DECLARE @string varchar(100) = 'xx123xx555xx999';
BEGIN
-- QUERY #1
-- patExtract8K
SELECT ps.itemNumber, ps.item
FROM samd.patExtract8K(@string, '[^0-9]') ps;
-- patternSplitCM
SELECT itemNumber = row_number() over (order by ps.itemNumber), ps.item
FROM dbo.patternSplitCM(@string, '[^0-9]') ps
WHERE [matched] = 0;
-- QUERY #2
SELECT ps.itemNumber, ps.item
FROM samd.patExtract8K(@string, '[0-9]') ps;
SELECT itemNumber = row_number() over (order by itemNumber), item
FROM dbo.patternSplitCM(@string, '[0-9]')
WHERE [matched] = 0;
END;
[Compatibility]:
SQL Server 2008+
[Syntax]:
--===== Autonomous
SELECT pe.ItemNumber, pe.ItemIndex, pe.ItemLength, pe.Item
FROM samd.patExtract8K(@string,@pattern) pe;
--===== Against a table using APPLY
SELECT t.someString, pe.ItemIndex, pe.ItemLength, pe.Item
FROM samd.SomeTable t
CROSS APPLY samd.patExtract8K(t.someString, @pattern) pe;
[Parameters]:
@string = varchar(8000); the input string
@searchString = varchar(50); pattern to search for
[Returns]:
itemNumber = bigint; the instance or ordinal position of the matched substring
itemIndex = bigint; the location of the matched substring inside the input string
itemLength = int; the length of the matched substring
item = varchar(8000); the returned text
[Developer Notes]:
1. Requires NGrams8k
2. patExtract8K does not return any rows on NULL or empty strings. Consider using
OUTER APPLY or append the function with the code below to force the function to return
a row on emply or NULL inputs:
UNION ALL SELECT 1, 0, NULL, @string WHERE nullif(@string,'') IS NULL;
3. patExtract8K is not case sensitive; use a case sensitive collation for
case-sensitive comparisons
4. patExtract8K is deterministic. For more about deterministic functions see:
https://msdn.microsoft.com/en-us/library/ms178091.aspx
5. patExtract8K performs substantially better with a parallel execution plan, often
2-3 times faster. For queries that leverage patextract8K that are not getting a
parallel exeution plan you should consider performance testing using Traceflag 8649
in Development environments and Adam Machanic's make_parallel in production.
[Examples]:
--===== (1) Basic extact all groups of numbers:
WITH temp(id, txt) as
(
SELECT * FROM (values
(1, 'hello 123 fff 1234567 and today;""o999999999 tester 44444444444444 done'),
(2, 'syat 123 ff tyui( 1234567 and today 999999999 tester 777777 done'),
(3, '&**OOOOO=+ + + // ==?76543// and today !!222222\\\tester{}))22222444 done'))t(x,xx)
)
SELECT
[temp.id] = t.id,
pe.itemNumber,
pe.itemIndex,
pe.itemLength,
pe.item
FROM temp AS t
CROSS APPLY samd.patExtract8K(t.txt, '[^0-9]') AS pe;
-----------------------------------------------------------------------------------------
Revision History:
Rev 00 - 20170801 - Initial Development - Alan Burstein
Rev 01 - 20180619 - Complete re-write - Alan Burstein
*****************************************************************************************/
RETURNS TABLE WITH SCHEMABINDING AS RETURN
SELECT itemNumber = ROW_NUMBER() OVER (ORDER BY f.position),
itemIndex = f.position,
itemLength = itemLen.l,
item = SUBSTRING(f.token, 1, itemLen.l)
FROM
(
SELECT ng.position, SUBSTRING(@string,ng.position,DATALENGTH(@string))
FROM samd.NGrams8k(@string, 1) AS ng
WHERE PATINDEX(@pattern, ng.token) < --<< this token does NOT match the pattern
ABS(SIGN(ng.position-1)-1) + --<< are you the first row? OR
PATINDEX(@pattern,SUBSTRING(@string,ng.position-1,1)) --<< always 0 for 1st row
) AS f(position, token)
CROSS APPLY (VALUES(ISNULL(NULLIF(PATINDEX('%'+@pattern+'%',f.token),0),
DATALENGTH(@string)+2-f.position)-1)) AS itemLen(l);
GO