SQL里面用自定义Split()完成个性化需求

set ansi_nulls on
go
set quoted_identifier on
go
create function [dbo].[splitstring]
(
@input nvarchar(max),
@separator nvarchar(max)=',',
@removeemptyentries bit=1
)
returns @table table
(
[id] int identity(1,1),
[value] nvarchar(max)
)
as
begin
declare @index int, @entry nvarchar(max)
set @index = charindex(@separator,@input)
while (@index>0)
begin
set @entry=ltrim(rtrim(substring(@input, 1, @index-1)))
if (@removeemptyentries=0) or (@removeemptyentries=1 and @entry<>'')
begin
insert into @table([value]) values(@entry)
end
set @input = substring(@input, @index+datalength(@separator)/2, len(@input))
set @index = charindex(@separator, @input)
end
set @entry=ltrim(rtrim(@input))
if (@removeemptyentries=0) or (@removeemptyentries=1 and @entry<>'')
begin
insert into @table([value]) values(@entry)
end
return
end

函数、表都建好了，下面调用测试一下吧：

declare @str1 varchar(max), @str2 varchar(max), @str3 varchar(max)
set @str1 = '1,2,3'
set @str2 = '1###2###3'
set @str3 = '1###2###3###'
select [value] from [dbo].[splitstring](@str1, ',', 1)
select [value] from [dbo].[splitstring](@str2, '###', 1)
select [value] from [dbo].[splitstring](@str3, '###', 0)

结果，截个图来看一下：