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-- T-SQL对字符串的处理能力比较弱,比如要循环遍历象1,2,3,4,5这样的字符串,如果用数组的话,遍历很简单,但是T-SQL不支持数组,所以处理下来比较麻烦。
--下边的函数,实现了象数组一样去处理字符串。
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--一、按指定符号分割字符串,返回分割后的元素个数,方法很简单,就是看字符串中存在多少个分隔符号,然后再加一,就是要求的结果。
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Create function Get_StrArrayLength
(
@str varchar(1024), --要分割的字符串
@split varchar(10) --分隔符号
)
returns int
as
begin
declare @location int
declare @start int
declare @length int
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set @str=ltrim(rtrim(@str))
set @location=charindex(@split,@str)
set @length=1
while @location<>0
begin
set @start=@location+1
set @location=charindex(@split,@str,@start)
set @length=@length+1
end
return @length
end
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--调用示例:select dbo.Get_StrArrayLength('78,1,2,3',',')
--返回值:4
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--二、按指定符号分割字符串,返回分割后指定索引的第几个元素,象数组一样方便
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Create function Get_StrArrayStrOfIndex
(
@str varchar(1024), --要分割的字符串
@split varchar(10), --分隔符号
@index int --取第几个元素
)
returns varchar(1024)
as
begin
declare @location int
declare @start int
declare @next int
declare @seed int
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set @str=ltrim(rtrim(@str))
set @start=1
set @next=1
set @seed=len(@split)
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set @location=charindex(@split,@str)
while @location<>0 and @index>@next
begin
set @start=@location+@seed
set @location=charindex(@split,@str,@start)
set @next=@next+1
end
if @location =0 select @location =len(@str)+1
--这儿存在两种情况:1、字符串不存在分隔符号 2、字符串中存在分隔符号,跳出while循环后,@location为0,那默认为字符串后边有一个分隔符号.
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return substring(@str,@start,@location-@start)
end
--调用示例:select dbo.Get_StrArrayStrOfIndex('8,9,4',',',2)
--返回值:9
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--三、结合上边两个函数,象数组一样遍历字符串中的元素
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declare @str varchar(50)
set @str='1,2,3,4,5'
declare @next int
set @next=1
while @next<=dbo.Get_StrArrayLength(@str,',')
begin
print dbo.Get_StrArrayStrOfIndex(@str,',',@next)
set @next=@next+1
end
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--=================
-调用结果:
-1
-2
-3
-4
-5
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--=================
////////////////////////////////
////////Sixi. Let it be.../////
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