sql中字符串分割函数

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

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)

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

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)