Question

我试图获取特定IP地址的国家/地区，IP按范围（长整数）存储在数据库中

我有以下SQL查询：

select * from dbo.ip
where IP_From = ( select max(IP_From) 
            from dbo.ip
            where IP_From <= @ipAddress 
            ) 
and IP_To = ( 
        select min(IP_To) 
            from dbo.ip
            where IP_To >= @ipAddress 
                )

数据库中的数据

IP_From     IP_To       Registry
16777728    16778239    apnic   1302739200  CN  CHN China
16778240    16779263    apnic   1302566400  AU  AUS Australia
16779264    16781311    apnic   1302566400  CN  CHN China
16781312    16785407    apnic   1302566400  JP  JPN Japan
16785408    16793599    apnic   1302566400  CN  CHN China
16793600    16809983    apnic   1302566400  JP  JPN Japan
16809984    16842751    apnic   1302220800  TH  THA Thailand

我正在尝试：

    //string strHttpClientIP = System.Web.HttpContext.Current.Request.UserHostAddress;
    string strHttpClientIP = "58.8.247.169";
    var splitIP = strHttpClientIP.Split('.');
    var a = splitIP[0];
    var b = splitIP[1];
    var c = splitIP[2];
    Int64 intIPFrom = FunctionsGlobal.IP2Int(Convert.ToString(a + "." + b + "." + c + ".0"));
    Int64 intIPTo = FunctionsGlobal.IP2Int(Convert.ToString(a + "." + b + "." + c + ".255"));

    var IPList = db.IpToCountries;

     var MaxIpFrom = IPList.Max(i => i.IP_From);
    var MinIpTo = IPList.Min(i => i.IP_To);
    var QueryCurrency = IPList.Where(i=>i.IP_From == MaxIpFrom && i.IP_To == MinIpTo);

我想转换为Linq c＃查询，任何线索？

Answer 1

类似这样的事情

from ip in IPList
let maxIp = IPList.Where(a=>a.IP_From <= ipAddress).Max(a=>a.IP_From) 
let minIp = IPList.Where(a=>a.IP_To >= ipAddress).Min(a=>a.IP_To)
where ip.IP_From == maxIp && ip.IP_To == minIp

SQL to Linq - ＆gt;选择最大值和最小值

1 个答案: