if exists(select name from sysobjects where name='xsGetRandChar')
	drop proc xsGetRandChar
go

-- =============================================
-- Author:	yzb
-- Create date: 20140120
-- Description:	生成一個指定長度的隨機字串，預設為8位。
-- =============================================
create proc xsGetRandChar
	@len int = 8,					-- 隨機字元長度
	@strChar nvarchar(12) output	-- 定義輸出變數。返回值為隨機字串
as
	IF @len > 12
		set @len = 12;
	declare @n int;
	declare @strSQL varchar(500);
	declare @strTmp varchar(7);
	set @strTmp = 'select ';
	set @strSQL = @strTmp;
	set @n = 0;
	while @n < @len
		begin
			set @strSQL = @strSQL+ char(cast(rand()*10000 as int)%26+65);
			set @n = @n + 1;
		end
	-- 過濾掉select字串，得到隨機字串
	set @strChar = right(@strSQL,len(@strSQL)-len(@strTmp)-1);
	--print @strChar;
	--return @strChar;
go

--呼叫儲存，使用輸出引數獲取。
declare @strChar nvarchar(12)
exec xsGetRandChar 9,@strChar output
print @strChar