if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_GetStr]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[f_GetStr]
GO
/*--得到字符串列表指定位置的字符
可以自定义字符串列表的分隔符
如果取数位置超出的范围,返回空字符串
--邹建 2004.07(引用请保留此信息)--*/
/*--调用示例
--测试数据
declare @t table(FITEM varchar(100))
insert @t select '100..10.'
union all select '20.140.10'
union all select '150.124.150.10'
--查询
select fitem1=dbo.f_GetStr(fitem,1,'.')
,fitem2=dbo.f_GetStr(fitem,2,'.')
,fitem3=dbo.f_GetStr(fitem,3,'.')
,fitem4=dbo.f_GetStr(fitem,4,'.')
,fitem4=dbo.f_GetStr(fitem,5,'.')
,fitem4=dbo.f_GetStr(fitem,6,'.')
from @t
--*/
CREATE FUNCTION f_GetStr(
@s varchar(8000), --字符串列表
@pos int, --要获取的数据信息段
@split varchar(10) --分隔符
)RETURNS varchar(100)
AS
BEGIN
IF @s IS NULL RETURN(NULL)
DECLARE @splitlen int
SELECT @splitlen=LEN(@split+'a')-2
WHILE @pos>1 AND CHARINDEX(@split,@s+@split)>0
SELECT @pos=@pos-1,
@s=STUFF(@s,1,CHARINDEX(@split,@s+@split)+@splitlen,'')
RETURN(ISNULL(LEFT(@s,CHARINDEX(@split,@s+@split)-1),''))
END
GO
ALTER function dbo.UDF_SplitSubString
(
@Expression varchar(8000)
,@Delimiter varchar(100)
,@ int
)
returns varchar(8000)
as
begin
--declare @Expression varchar(8000)
--set @Expression = 'abc@@pppp@aa'
--declare @Delimiter varchar(100)
--set @Delimiter = '@@@'
--declare @ int
--set @ = 3
declare @p int
set @p = CharIndex(@Delimiter,@Expression)
if @p > 0
begin
set @p = @p + len(@Delimiter) - 1
end
declare @i int
set @i = 1
while @i < @
begin
set @i = @i + 1
set @Expression = substring (@Expression, @p + 1,len(@Expression) - @p )
set @p = CharIndex(@Delimiter,@Expression)
if @p > 0
begin
set @p = @p + len(@Delimiter) - 1
end
else
begin
break
end
end
declare @s varchar(1000)
if @p = 0 and @i = @
begin
set @s = @Expression
end
else if @i = @
begin
set @s = substring(@Expression, 1,@p - len(@Delimiter))
end
return @s
end
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
修改了一点点内容:
alter function UDF_SplitSubString
(
@Expression varchar(8000),
@Delimiter char(1),
@ int,
@Dot char(1) = '$'
)
returns varchar(200)
as
begin
declare @p int
declare @old_p int
declare @s varchar(1000)
set @p = CharIndex(@Delimiter,@Expression)
declare @i int
set @i = 1
while @i <= @
begin
set @Expression = substring (@Expression, @p + 1,len(@Expression) - @p )
set @old_p = @p
set @p = CharIndex (@Delimiter,@Expression)
--增加if,效率高
if(@p = 0)
begin
--增加@old_p,这样如果超出@Expression中@Delimiter的个数,则返回空
if(@old_p = 0)
return ''
else
set @s = @Expression
end
set @i = @i + 1
end
if(@p = 0)
begin
set @s = @Expression
end
else
begin
--替换一下 '.' 因为 parsename 只认 '.'
set @Expression = replace(@Expression,'.',@Dot) --所以先把字符串中的'.'替换为其它在@Expression中不可能存在的字符
set @Expression = substring(@Expression,1,@p - 1) + '.' + substring(@Expression, @p + 1,len(@Expression) - @p)
set @s = ParseName(@Expression,2)
set @s = replace(@s,@Dot,'.')
end
if(@s is null)
set @s = ''
return @s
end