實現SQL Server中的切割字符串SplitString函數

有時咱們要用到批量操做時都會對字符串進行拆分,但是SQL Server中卻沒有自帶Split函數,因此要本身來實現了。沒什麼好說的,須要的朋友直接拿去用吧sql

 

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO


/*
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)
)
as
begin
    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

    return
end

如何使用:ide

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:函數

 

裏面還有個自增的[Id]字段哦,在某些狀況下有可能會用上的,例如根據Id來保存排序等等。spa

例如根據某表的ID保存排序:code

    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]

  

具體的應用請根據本身的狀況來吧:)blog

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