SQL实现split函数,自定义分割字符,自定义取出第几个分割字符前的字符串
自定义取出第几个分割字符前的字符串,默认位置(0)
格式:dbo.split(字段名,'分隔字符',取出的第几个字符串)
如果没有分隔的字符,则返回整个字符串。
如果取出的位置字符串的位置超出Index则返回空。
CREATE FUNCTION [dbo].[split]
(@str nvarchar(4000),@code varchar(10),@no int )
RETURNS varchar(200)
AS
BEGIN
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declare @intLen int
declare @count int
declare @indexb int
declare @indexe int
set @intLen=len(@code)
set @count=0
set @indexb=1
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if @no=0
if charindex(@code,@str,@indexb)<>0
return left(@str,charindex(@code,@str,@indexb)-1)
else
return @str
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while charindex(@code,@str,@indexb)<>0
begin
set @count=@count+1
if @count=@no
break
set @indexb=@intLen+charindex(@code,@str,@indexb)
end
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if @count=@no
begin
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set @indexe=@intLen+charindex(@code,@str,@indexb)
if charindex(@code,@str,@indexe)<>0
return substring(@str,charindex(@code,@str,@indexb)+len(@code),charindex(@code,@str,@indexe)-charindex(@code,@str,@indexb)-len(@code))
else
return right(@str,len(@str)-charindex(@code,@str,@indexb)-len(@code)+1)
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end
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return ''
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END
格式:dbo.split(字段名,'分隔字符',取出的第几个字符串)
如果没有分隔的字符,则返回整个字符串。
如果取出的位置字符串的位置超出Index则返回空。
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