EF - 批量插入

比较一下下面两种方式的区别

1,每Add一次 就savechange()

  static void Main(string[] args)
        {
            //List<User> users= Find1(u => u.NickName.Contains("luo4"));
            Stopwatch sw = new Stopwatch();
            sw.Start();
            using (DB db = new DB())
            {
                for (int i = 0; i < 1000; i++)
                {
                    User item = new User();
                    item.NickName = "luo_" + i;
                    item.RegisterTime = DateTime.Now;
                    db.User.Add(item);
                    db.SaveChanges();
                }
            }
            sw.Stop();
            Console.WriteLine("运行时间:{0}ms",sw.ElapsedMilliseconds.ToString());
            Console.ReadKey();
        }

　　

2,将所有User 添加到db中再统一savechange()

            using (DB db = new DB())
            {
                for (int i = 0; i < 1000; i++)
                {
                    User item = new User();
                    item.NickName = "luo_" + i;
                    item.RegisterTime = DateTime.Now;
                    db.User.Add(item);

                }
                db.SaveChanges();
            }

下面可以看出是少执行了一句Audit Login

Audit:Login

-- network protocol: LPC
set quoted_identifier on
set arithabort off
set numeric_roundabort off
set ansi_warnings on
set ansi_padding on
set ansi_nulls on
set concat_null_yields_null on
set cursor_close_on_commit off
set implicit_transactions off
set language 简体中文
set dateformat ymd
set datefirst 7
set transaction isolation level read committed