在T-SQL中我们经常批量操作时都会对字符串进行拆分,可是SQL Server中却没有自带Split函数,所以要自己来实现了。这里将字符串分割以table形式输出
语法如下:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
/*
create by shuke.li 2020-9-15
*/
create function [dbo].[SplitString]
(
@Input nvarchar(max), --input string to be separated
@Separator nvarchar(max)=',', --a string that delimit the substrings in the input string
@RemoveEmptyEntries bit=1 --the return value does not include array elements that contain an empty string
)
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
只要在新建查询里执行上面的代码,即完成了split函数的建立。
下面来测试这一函数的功能,测试所使用的的SQL脚本如下:
declare @str1 varchar(max)
set @str1 = 'CFER-3345-3323,CFER-0023-2299,CFER-0023-6677,CFER-0023-7678,CFER-4565-2299,CFER-0023-6678' select * from [dbo].[SplitString](@str1, ',', 0)
结果显示如下图所示:
最终使用方法和c#中的split函数是不是很相似!