今天在查詢資料的時候，突然要查指定IP範圍內的IP總數，思考了一下，主要使用charindex和reverse，下面是詳細的SQL語句

DECLARE 
@IP varchar(50),
@IPSub varchar(40),
@range varchar(10),
@beginIP varchar(50),
@endIP varchar(50),
@max int,
@min int,
@count int
SET @IP='62.145.88.0/24'
SET @range=right(@IP,charindex('.',reverse(@IP))-1)--獲取第三個ip後的字串
--PRINT @range
SET @IPSub= substring(@IP,0,len(@IP)-charindex('.',reverse(@IP))+2)--獲取ip前三段字串
SET @max=substring(@range,0,charindex('/',@range))--獲取最大值,假裝的
--PRINT @max
SET @min=substring(@range,charindex('/',@range)+1,len(@range)-charindex('/',@range))--獲取最小值,假裝的
--PRINT @min
IF @max<@min
begin
	SET @
 
[email protected]+convert(varchar(5),@max)
	SET @[email protected]+convert(varchar(5),@min)	
	PRINT @beginIP
	PRINT @endIP
end
else
begin
	SET @[email protected]+convert(varchar(5),@min)
	SET @[email protected]+convert(varchar(5),@max)	
	PRINT @beginIP
	PRINT @endIP
end

SET @count=(SELECT count(*) FROM UserActivityLog where RemoteAddr 
BETWEEN @beginIP AND @endIP)
PRINT @count

 

parsename(@ip,4)*cast(16777216 as bigint)+parsename(@ip,3)*65536+
    parsename(@ip,2)*256+parsename(@ip,1)