SQL里面用自定义Split()完成个性化需求

MsSQL 2019-01-03

<div class="codetitle"><a style="CURSOR: pointer" data="13875" class="copybut" id="copybut13875" onclick="doCopy('code13875')"> 代码如下:

<div class="codebody" id="code13875">
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：
<div class="codetitle"><a style="CURSOR: pointer" data="5590" class="copybut" id="copybut5590" onclick="doCopy('code5590')"> 代码如下:
<div class="codebody" id="code5590">
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
select [Value] from [dbo].SplitString
select [Value] from [dbo].SplitString

结果，截个图来看一下：
<IMG src="https:https://files.jb51.cc/file_images/article/201302/2013221145734697.gif?2013121145826"&gt;

自定义函数

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