Вот мой чрезмерный подход, но я чувствую, что это достаточно надежный подход. Он сочетает в себе классические методы решения проблем SQL числовых таблиц для разрезания строк и использование FOR XML для объединения линий разделения обратно. Код длинный, но единственное место, которое вам нужно отредактировать, - это раздел SOURCE_DATA.
Никаких стуков в подходе @Jeremy Wiggins, но я предпочитаю мой, так как он хорошо поддается подходу, основанному на множествах, в дополнение к довольно эффективному коду.
-- This code will rip lines apart based on @delimiter
-- and put them back together based on @rebind
DECLARE
@delimiter char(1)
, @rebind varchar(10);
SELECT
@delimiter = '.'
, @rebind = char(10) + char(149) + ' ';
;
-- L0 to L5 simulate a numbers table
-- http://billfellows.blogspot.com/2009/11/fast-number-generator.html
WITH L0 AS
(
SELECT
0 AS C
UNION ALL
SELECT
0
)
, L1 AS
(
SELECT
0 AS c
FROM
L0 AS A
CROSS JOIN L0 AS B
)
, L2 AS
(
SELECT
0 AS c
FROM
L1 AS A
CROSS JOIN L1 AS B
)
, L3 AS
(
SELECT
0 AS c
FROM
L2 AS A
CROSS JOIN L2 AS B
)
, L4 AS
(
SELECT
0 AS c
FROM
L3 AS A
CROSS JOIN L3 AS B
)
, L5 AS
(
SELECT
0 AS c
FROM
L4 AS A
CROSS JOIN L4 AS B
)
, NUMS AS
(
SELECT
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS number
FROM
L5
)
, SOURCE_DATA (ID, content) AS
(
-- This query simulates your input data
SELECT 1, 'Sentence one. Sentence two. Sentence three.'
UNION ALL SELECT 7, 'In seed time learn, in harvest teach, in winter enjoy.Drive your cart and your plow over the bones of the dead.The road of excess leads to the palace of wisdom.Prudence is a rich, ugly old maid courted by Incapacity.He who desires but acts not, breeds pestilence.'
)
, MAX_LENGTH AS
(
-- this query is rather important. The current NUMS query generates a
-- very large set of numbers but we only need 1 to maximum lenth of our
-- source data. We can take advantage of a 2008 feature of letting
-- TOP take a dynamic value
SELECT TOP (SELECT MAX(LEN(SD.content)) AS max_length FROM SOURCE_DATA SD)
N.number
FROM
NUMS N
)
, MULTI_LINES AS
(
-- This query will make many lines out a single line based on the supplied delimiter
-- Need to retain the ID (or some unique value from original data to regroup it
-- http://www.sommarskog.se/arrays-in-sql-2005.html#tblnum
SELECT
SD.ID
, LTRIM(substring(SD.content, Number, charindex(@delimiter, SD.content + @delimiter, Number) - Number)) + @delimiter AS lines
FROM
MAX_LENGTH
CROSS APPLY
SOURCE_DATA SD
WHERE
Number <= len(SD.content)
AND substring(@delimiter + SD.content, Number, 1) = @delimiter
)
, RECONSITITUE (content, ID) AS
(
-- use classic concatenation to put it all back together
-- using CR/LF * (space) as delimiter
-- as a correlated sub query and joined back to our original table to preserve IDs
-- https://stackoverflow.com/questions/5196371/sql-query-concatenating-results-into-one-string
SELECT DISTINCT
STUFF
(
(
SELECT @rebind + M.lines
FROM MULTI_LINES M
WHERE M.ID = ML.ID
FOR XML PATH('')
)
, 1
, 1
, '')
, ML.ID
FROM
MULTI_LINES ML
)
SELECT
R.content
, R.ID
FROM
RECONSITITUE R
Результаты
content ID
----------------------------------------------------------- ---
• In seed time learn, in harvest teach, in winter enjoy.
• Drive your cart and your plow over the bones of the dead.
• The road of excess leads to the palace of wisdom.
• Prudence is a rich, ugly old maid courted by Incapacity.
• He who desires but acts not, breeds pestilence. 7
• Sentence one.
• Sentence two.
• Sentence three. 1
(2 row(s) affected)
Ссылки