[MSSQL]生成n位随机字符串

 --1、借助newid()go--创建视图(因为在函数中无法直接使用newid())create view vnewidasselect newid() N'MacoId';go--创建函数create function getrandstr(@n int)returns varchar(max)asbegindeclare @i intset @i=ceiling(@n/32.00)declare @j intset @j=0declare @k varchar(max)set @k=''while @j<@ibeginselect @k=@k+replace(cast(MacoId as varchar(36)),'-','') from vnewid set @j=@j+1endset @k=substring(@k,1,@n)return @kend--测试示例select dbo.getrandstr(75)--运行结果/*D185504AD09C4D5796F7016983E67414CEE25162EA9F43D195D43328A4CF01AC7C586521D8E*/--我们可以发现结果中的字母都是大写的，或是都是小写的。--换种方法来写下：go--创建函数create function [dbo].[m_rand](@mycount int) returns nvarchar(2000)as begin declare @maco_wang table (id varchar(1))declare @maco_number int,@number int;declare @my_one nvarchar(max),@my_two nvarchar(max)set @my_one='';set @maco_number=0; set @number =48;while (@number>=48 and @number<=57) or (@number>=65 and @number<=90) or (@number>=97 and @number<=122) begininsert into @maco_wang select char(@number)set @number=@number+1;if(@number=58)beginset @number=65 endif(@number=91)begin set @number=97 endendwhile @maco_number<@mycount begin select @my_two=id from @maco_wang order by (select MacoId from dbo.m_macoview); set @my_one=@my_two+@my_one;set @maco_number=@maco_number+1; endreturn @my_one end--测试用例select [dbo].[m_rand](75)--运行结果/*5nN0w4o4VOkjacB5so2uvCuw2ZRrnBhxEi4IcsEOHzBbStKmR1p8ASH4N4XaxhDoDEtkX8bZ0CR*/