字符串截取的函数自定义

 

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
/****************分割字符串 ****************/
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

declare @s varchar(100),@sql varchar(1000),@split VARCHAR(10),@index INT


SET @split=‘|‘;
SET @index=1;
SET @s=‘|21|2106|‘;


select COUNT(*) from [dbo].[SplitString](@s, @split, 1)
select * from [dbo].[SplitString](@s, @split, 1)