【叶子函数分享九】根据字符分割字符串的三种写法

go

--创建函数(第一版)

create function [dbo].[m_split](@c varchar(2000),@split varchar(2))  

    returns @t table(col varchar(200))  

as  

begin  

      while(charindex(@split,@c)<>0)  

        begin  

          insert @t(col) values (substring(@c,1,charindex(@split,@c)-1))  

          set @c = stuff(@c,1,charindex(@split,@c),"")  

        end  

      insert @t(col) values (@c)  

      return  

end

 

--下面两种是在论坛看到高手们发的

go

--创建函数(第二版)(fredrickhu(小F))

create function [dbo].[f_split](@s varchar(8000), @split varchar(10) )

returns table

as

 return

 (select substring(@s,number,charindex(@split,@s+@split,number)-number)as col

  from master..spt_values

  where type="p" and number<=len(@s+"a")

  and charindex(@split,@split+@s,number)=number)

 

go

--创建函数(第三版)(dawugui(爱新觉罗.毓华))

create function [dbo].[d_split] (@inputstr varchar(8000),@seprator varchar(10))

returns @temp table (a varchar(200))

as

begin

  declare @i int

  set @inputstr = rtrim(ltrim(@inputstr))

  set @i = charindex(@seprator, @inputstr)

  while @i >= 1

  begin

    insert @temp values(left(@inputstr, @i - 1))

    set @inputstr = substring(@inputstr, @i + 1, len(@inputstr) - @i)

    set @i = charindex(@seprator, @inputstr)

  end

  if @inputstr <> "/"

  insert @temp values(@inputstr)

  return

end

 

--测试示例

declare @sql varchar(20)

set @sql="A,B,C,D,E"

 

select * from dbo.m_split(@sql,",")

select * from dbo.f_split(@sql,",")

select * from dbo.d_split(@sql,",")

 

--运行结果(结果是相同的)

/*

col

---------

A

B

C

D

E

*/