標籤:
有時我們要用到大量操作時都會對字串進行拆分,可是SQL Server中卻沒有內建Split函數,所以要自己來實現了。沒什麼好說的,需要的朋友直接拿去用吧
SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGO/*by kudychen 2011-9-28 */CREATE function [dbo].[SplitString]( @Input nvarchar(max), --input string to be separated @Separator nvarchar(max)=‘,‘, --a string that delimit the substrings in the input string @RemoveEmptyEntries bit=1 --the return value does not include array elements that contain an empty string)returns @TABLE table( [Id] int identity(1,1), [Value] nvarchar(max))asbegin declare @Index int, @Entry nvarchar(max) set @Index = charindex(@Separator,@Input) while (@Index>0) begin set @Entry=ltrim(rtrim(substring(@Input, 1, @Index-1))) if (@RemoveEmptyEntries=0) or (@RemoveEmptyEntries=1 and @Entry<>‘‘) begin insert into @TABLE([Value]) Values(@Entry) end set @Input = substring(@Input, @Index+datalength(@Separator)/2, len(@Input)) set @Index = charindex(@Separator, @Input) end set @Entry=ltrim(rtrim(@Input)) if (@RemoveEmptyEntries=0) or (@RemoveEmptyEntries=1 and @Entry<>‘‘) begin insert into @TABLE([Value]) Values(@Entry) end returnend
如何使用:
declare @str1 varchar(max), @str2 varchar(max), @str3 varchar(max) set @str1 = ‘1,2,3‘set @str2 = ‘1###2###3‘set @str3 = ‘1###2###3###‘ select [Value] from [dbo].[SplitString](@str1, ‘,‘, 1)select [Value] from [dbo].[SplitString](@str2, ‘###‘, 1)select [Value] from [dbo].[SplitString](@str3, ‘###‘, 0)
執行結果:
裡面還有個自增的[Id]欄位哦,在某些情況下有可能會用上的,例如根據Id來儲存排序等等。
例如根據某表的ID儲存排序:
update a set a.[Order]=t.[Id] from [dbo].[表] as a join [dbo].SplitString(‘1,2,3‘, ‘,‘, 1) as t on a.[Id]=t.[Value]
具體的應用請根據自己的情況來吧:)
實現SQL Server中的切割字串SplitString函數