二.去除字符串中连续的分割符

--创建函数

 

create function [dbo].[m_delrepeatsplit]
(
    @str varchar(2000),
    @split nvarchar(200)
)
returns nvarchar(2000)
as  
begin
    --begin declare   
       declare @count int,@i int,@isnull int
       declare @newchar nvarchar(200),@nn nvarchar(300)
       set @count=len(@str);set @i=1;set @isnull=1;set @nn='';
    --end declare
    --begin while
       while @i<@count+1
       begin
           set @newchar=substring(@str,@i,1)
           if(@isnull=1)
           begin
              set @nn=@nn+@newchar;   
              if(@newchar=@split)
                  begin
                     set @isnull=0;
                  end
              else
                  begin
                     set @isnull=1;
                  end   
           end
           else
              begin
                  if(@newchar=@split)
                     begin
                         set @isnull=0;
                     end
                  else
                     begin
                         set @nn=@nn+@newchar;   
                         set @isnull=1;
                     end   
              end
           set @i=@i+1;
       end
    --end while
    return  @nn
end

 

--2、测试示例

 

declare @str nvarchar(200)
set @str='1  2 3    4 555 6  7    7';
declare @split nvarchar(200)
set @split=' ';
select dbo.m_delrepeatsplit(@str,@split) as newchar

--运行结果
/*
newchar
------------------
1 2 3 4 555 6 7 7
*/