我已根据此处的要求开发了一个双分割器（带有两个分割字符）。在该线程中可能具有某些价值，因为该线程在与字符串拆分有关的查询中引用最多。
CREATE FUNCTION uft_DoubleSplitter
(
-- Add the parameters for the function here
@String VARCHAR(4000),
@Splitter1 CHAR,
@Splitter2 CHAR
)
RETURNS @Result TABLE (Id INT,MId INT,SValue VARCHAR(4000))
AS
BEGIN
DECLARE @FResult TABLE(Id INT IDENTITY(1, 1),
SValue VARCHAR(4000))
DECLARE @SResult TABLE(Id INT IDENTITY(1, 1),
MId INT,
SValue VARCHAR(4000))
SET @String = @String+@Splitter1
WHILE CHARINDEX(@Splitter1, @String) > 0
BEGIN
DECLARE @WorkingString VARCHAR(4000) = NULL
SET @WorkingString = SUBSTRING(@String, 1, CHARINDEX(@Splitter1, @String) - 1)
--Print @workingString
INSERT INTO @FResult
SELECT CASE
WHEN @WorkingString = '' THEN NULL
ELSE @WorkingString
END
SET @String = SUBSTRING(@String, LEN(@WorkingString) + 2, LEN(@String))
END
IF ISNULL(@Splitter2, '') != ''
BEGIN
DECLARE @OStartLoop INT
DECLARE @OEndLoop INT
SELECT @OStartLoop = MIN(Id),
@OEndLoop = MAX(Id)
FROM @FResult
WHILE @OStartLoop <= @OEndLoop
BEGIN
DECLARE @iString VARCHAR(4000)
DECLARE @iMId INT
SELECT @iString = SValue+@Splitter2,
@iMId = Id
FROM @FResult
WHERE Id = @OStartLoop
WHILE CHARINDEX(@Splitter2, @iString) > 0
BEGIN
DECLARE @iWorkingString VARCHAR(4000) = NULL
SET @IWorkingString = SUBSTRING(@iString, 1, CHARINDEX(@Splitter2, @iString) - 1)
INSERT INTO @SResult
SELECT @iMId,
CASE
WHEN @iWorkingString = '' THEN NULL
ELSE @iWorkingString
END
SET @iString = SUBSTRING(@iString, LEN(@iWorkingString) + 2, LEN(@iString))
END
SET @OStartLoop = @OStartLoop + 1
END
INSERT INTO @Result
SELECT MId AS PrimarySplitID,
ROW_NUMBER() OVER (PARTITION BY MId ORDER BY Mid, Id) AS SecondarySplitID ,
SValue
FROM @SResult
END
ELSE
BEGIN
INSERT INTO @Result
SELECT Id AS PrimarySplitID,
NULL AS SecondarySplitID,
SValue
FROM @FResult
END
RETURN
用法：
--FirstSplit
SELECT * FROM uft_DoubleSplitter('ValueA=ValueB=ValueC=ValueD==ValueE&ValueA=ValueB=ValueC===ValueE&ValueA=ValueB==ValueD===','&',NULL)
--Second Split
SELECT * FROM uft_DoubleSplitter('ValueA=ValueB=ValueC=ValueD==ValueE&ValueA=ValueB=ValueC===ValueE&ValueA=ValueB==ValueD===','&','=')
可能的用法（获取每个拆分的第二个值）：
SELECT fn.SValue
FROM uft_DoubleSplitter('ValueA=ValueB=ValueC=ValueD==ValueE&ValueA=ValueB=ValueC===ValueE&ValueA=ValueB==ValueD===', '&', '=')AS fn
WHERE fn.mid = 2