sql字符串截取

//分割字符串

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Get_StrArrayLength]') and xtype in (N'FN', N'IF', N'TF'))
  begin
    drop function [dbo].[Get_StrArrayLength]
  end
GO
CREATE function [dbo].[Get_StrArrayLength]
( 
@str varchar(1024), --要分割的字符串 
@split varchar(10) --分隔符号 
) 
returns int 
as 
begin 
declare @location int 
declare @start int 
declare @length int 


set @str=ltrim(rtrim(@str)) 
set @location=charindex(@split,@str) 
set @length=1 
while @location<>0 
begin 
set @start=@location+1 
set @location=charindex(@split,@str,@start) 
set @length=@length+1 
end 
return @length 
end 

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Get_StrArrayStrOfIndex]') and xtype in (N'FN', N'IF', N'TF'))
  begin
    drop function [dbo].[Get_StrArrayStrOfIndex]
  end
GO
CREATE function [dbo].[Get_StrArrayStrOfIndex]
(
 @str varchar(1024),  --要分割的字符串
 @split varchar(10),  --分隔符号
 @index int --取第几个元素
)
returns varchar(1024)
as
begin
 declare @location int
 declare @start int
 declare @next int
 declare @seed int
 set @str=ltrim(rtrim(@str))
 set @start=1
 set @next=1
 set @seed=len(@split)
 set @location=charindex(@split,@str)
 while @location<>0 and @index>@next
   begin
    set @start=@location+@seed
    set @location=charindex(@split,@str,@start)
    set @next=@next+1
   end
 if @location =0 select @location =len(@str)+1
 
--这儿存在两种情况：1、字符串不存在分隔符号 2、字符串中存在分隔符号，跳出while循环后，@location为0，那默认为字符串后边有一个分隔符号。
 return substring(@str,@start,@location-@start)
end
go

declare @id int,@periodRecord varchar(1024)
          set @id = (select top(1) id from @Ids) 
          --用货记录 [格式:'1,53,55,88']
          set @periodRecord = (select PeriodRecord from customer where Id = @id)
          
          --调用自定义方法,将记录拆分存放到临时表
            declare @next int 
			declare @temp table(id int) 
			delete from @temp
			--判断记录数是否大于次数
			  if(dbo.Get_StrArrayLength(@periodRecord,',') >@times)
				begin
				   set @next=dbo.Get_StrArrayLength(@periodRecord,',')-@times+1
				end
			  else
				begin
				   set @next =2 --PeriodRecord 默认值为0
				end  
			while @next<=dbo.Get_StrArrayLength(@periodRecord,',') 
				begin 
					Insert into @temp select dbo.Get_StrArrayStrOfIndex(@periodRecord,',',@next) 
					set @next=@next+1 
				end