SQL根據指定分隔符分解字符串實現步驟

2024-08-31 00:44:41

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如果有一個字符串 eg: "sun,star,moon,clouds",想要在MS SQL中根據給定的分隔符','把這個字符串分解成各個元素[sun] [star] [moon] [clouds]，如何實現呢？為此，創建一個Function,代碼如下:

復制代碼代碼如下:

CREATE FUNCTION [dbo].[Split_StrByDelimiter](@String VARCHAR(8000), @Delimiter CHAR(1))
RETURNS @temptable TABLE (items VARCHAR(8000))
AS
BEGIN
DECLARE @idx INT
DECLARE @slice VARCHAR(8000)
SELECT @idx = 1
IF len(@String)<1 OR @String IS NULL RETURN
while @idx!= 0
BEGIN
SET @idx = charindex(@Delimiter,@String)
IF @idx!=0
SET @slice = LEFT(@String,@idx - 1)
ELSE
SET @slice = @String
IF(len(@slice)>0)
INSERT INTO @temptable(Items) VALUES(@slice)
SET @String = RIGHT(@String,len(@String) - @idx)
IF len(@String) = 0 break
END
RETURN
END

示例：如果輸入
SELECT * FROM dbo.Split_StrByDelimiter('sun,star,moon,clouds',',')
結果返回
sun
star
moon
clouds
在上面的代碼做變形，返回有多少個元素

復制代碼代碼如下:

CREATE FUNCTION [dbo].[GetCount_Split_StrByDelimiter](@String VARCHAR(8000), @Delimiter CHAR(1))
RETURNS INT
AS
BEGIN
DECLARE @temptable TABLE (items VARCHAR(8000))
DECLARE @SplitCount INT
DECLARE @idx INT
DECLARE @slice VARCHAR(8000)
SELECT @idx = 1
IF len(@String)<1 OR @String IS NULL RETURN 0
while @idx!= 0
BEGIN
SET @idx = charindex(@Delimiter,@String)
IF @idx!=0
SET @slice = LEFT(@String,@idx - 1)
ELSE
SET @slice = @String
IF(len(@slice)>0)
INSERT INTO @temptable(Items) VALUES(@slice)
SET @String = RIGHT(@String,len(@String) - @idx)
IF len(@String) = 0 break
END
SET @SplitCount=(SELECT COUNT(*) FROM @temptable)
RETURN @SplitCount
END