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实现SQL Server中的切割字符串SplitString函数,返回Table

有时我们要用到批量操作时都会对字符串进行拆分,可是SQL Server中却没有自带Split函数,所以要自己来实现了。

-- =============================================-- Author:        chenlong-- Create date: 2015-02-02-- Description:    根据逗号分隔拆分字符串,返回table-- =============================================ALTER FUNCTION [dbo].[fn_SplitString] (    @Input nvarchar(max), --输入字符串    @Separator nvarchar(max)=,, --分隔符    @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 the return variable here    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 = 1,2,3set @str2 = 1###2###3set @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)

执行结果如下图所示:

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里面还有个自增的[Id]字段哦,在某些情况下有可能会用上的,例如根据Id来保存排序等等。

 例如根据某表的ID保存排序:

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]

具体的应用请根据自己的情况来吧:)

方法二:

Create function [dbo].[f_split](@aString varchar(max),@pattern varchar(10))returns @temp table(r int,a varchar(100))--实现split功能 的函数-- select a from dbo.f_split(‘我:们a:a:b: ‘,‘:‘)asbegin    declare @i int    declare @row int    set @row=1    set @aString=rtrim(ltrim(@aString))    set @i=charindex(@pattern,@aString)    while @i>=1    begin        insert @temp values(@row,left(@aString,@i-1))        set @aString=right(@aString,len(@aString)-@i)        set @i=charindex(@pattern,@aString)        set @row=@row+1    end    if @aString<>‘‘       insert @temp values(@row,@aString)    returnend

 

实现SQL Server中的切割字符串SplitString函数,返回Table