SQL split 函数

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO



CREATE function [dbo].[SplitString]

(

    @Input nvarchar(max),

    @Separator nvarchar(max)=',', 

    @RemoveEmptyEntries bit=1 

)

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