EF批量操作数据之EntityFramework.Extended

本是古典何须时尚 2022-06-16 08:13 597阅读 0赞

**一 、EntityFramework.Extented整理**

Git源代码地址：

[https://github.com/loresoft/EntityFramework.Extended][https_github.com_loresoft_EntityFramework.Extended]

**二 、使用 实例**

1.批量添加 数据 AddRange()发放，EF自带改方法

TestOne _context = new DBA.TestOne();
    DateTime start = DateTime.Now;
    for (int i = 0; i < 10000; i++)
    {
        _context.Numeber1.Add(new Numeber1()
        {
            Num1 = i
        });
        _context.SaveChanges();
    }
    Console.WriteLine(_context.Numeber1.Count());
    Console.WriteLine("总时长秒数：" + (DateTime.Now - start).TotalSeconds); //调试状态下 500多秒，非调试状态下 280秒
    
    //批量新增
    List<Numeber1> list = new List<Numeber1>();
    for (int i = 0; i < 10000; i++)
    {
        list.Add(new Numeber1()
        {
            Num1 = i
        });
    }
    _context.Numeber1.AddRange(list);
    _context.SaveChanges();
    Console.WriteLine("总时长秒数：" + (DateTime.Now - start).TotalSeconds); //批量添加9秒钟

**2.批量更新 **

//data为修改的行数
    int   data =context.LogData.Where(a=>a.EntityKey=="aa").Update(b=> new LogData { EntityName = "ss" });
    //第二种写法,这种是针对DbSet的,已经标注过时了
     var data = context.LogData.Update(a => a.EntityKey == "aa",b=> new LogData { EntityName = "ss" });

//批量更新
    TestOne _context = new DBA.TestOne();
    DateTime start = DateTime.Now;
    int count = _context.Numeber1.Where(q => q.ID > 10000).Update(q => new Numeber1()
    {
        Num1 = q.Num1 * 1000
    });
    _context.SaveChanges();
    Console.WriteLine("总共更新数据:" + count);
    Console.WriteLine("总时长秒数:" + (DateTime.Now - start).TotalSeconds); //批量更新：1秒多时间

**3.批量 删除**

//记得引用
    using EntityFramework.Extensions;
    //这两种写法都可以,Context是你的EF上下文对象.
    context.LogData.Delete(a => a.EntityKey == "aa");
    context.LogData.Where(a => a.EntityKey == "aa").Delete();

//批量删除操作
    TestOne _context = new DBA.TestOne();
    DateTime start = DateTime.Now;
    int count = _context.Numeber1.Where(q => q.ID <= 30000).Delete();
    _context.SaveChanges();
    Console.WriteLine("总共删除数据:" + count);
    Console.WriteLine("总时长秒数:" + (DateTime.Now - start).TotalSeconds); //批量删除：1秒左右时间

4.批量查询

var count =context.LogData.FutureCount();
                        var data = context.LogData.FutureFirstOrDefault(); 
                        var datalist = context.LogData.Future();
                        //在同一个代码上下文中,count,data,datalist这三个对象
                        //任意一个,第一次tolist或者.Value的时候,会连接一次数据库
                        //同时查询这三个数据,而不会分三次查询
                        var datalists = datalist.ToList();
                        int countdata = count.Value;

5.查询缓存

//使用默认的缓存时间
    var tasks = db.Tasks
        .Where(t => t.CompleteDate == null)
        .FromCache();
    
    //查询结果缓存300秒
    var tasks = db.Tasks
        .Where(t => t.AssignedId == myUserId && t.CompleteDate == null)
        .FromCache(CachePolicy.WithDurationExpiration(TimeSpan.FromSeconds(300)));

更多参考：

EF[汇总函数使用注意事项Max()/Min()等][Max_Min]

[EF中查看上下文执行的Sql语句][EF_Sql]

[EF GroupBy多个字段][EF GroupBy]

[http://www.cnblogs.com/GuZhenYin/p/5482288.html][http_www.cnblogs.com_GuZhenYin_p_5482288.html]

[https_github.com_loresoft_EntityFramework.Extended]: https://github.com/loresoft/EntityFramework.Extended
[Max_Min]: http://blog.csdn.net/u011127019/article/details/61413670
[EF_Sql]: http://blog.csdn.net/u011127019/article/details/61413569
[EF GroupBy]: http://blog.csdn.net/u011127019/article/details/54943303
[http_www.cnblogs.com_GuZhenYin_p_5482288.html]: http://www.cnblogs.com/GuZhenYin/p/5482288.html