EFUpdate

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.Entity;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Diagnostics;
using TH.Com.General;
using TH.Common;

public partial class EFUpdate : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        var sp = new Stopwatch();
        sp.Start();

        var isSqlBulkCopy = true;
        var list = new List<Article>();
        using (var da = new THCommon())
        {
            Random rand = new Random();

            for (var i = ; i < ; i++)
            {
                var art = new Article();
                art.ID = Guid.NewGuid();
                art.Area = Convert.ToDecimal(rand.Next() / 100.0);
                art.CreateBy = "sdm";
                art.CreateTime = DateTime.Now.AddMinutes(i);
                art.Height = rand.Next();
                art.Name = "Name" + i;
                art.Note = "This is Note" + i;
                art.Number = i;
                art.Price = Convert.ToDecimal(rand.Next() / 100.0);
                art.Weight = Convert.ToDecimal(rand.Next() / 100.0);

                list.Add(art);

            }
            sp.Stop();
            Debug.Print("Articles.Add = " + sp.ElapsedMilliseconds);
            sp.Restart();

            if (isSqlBulkCopy)
            {
                SaveList(da, list);
            }
            else
            {
                da.Articles.AddRange(list);
                da.SaveChanges();
            }

            sp.Stop();
            Debug.Print("SaveChanges = " + sp.ElapsedMilliseconds);
            sp.Restart();
        }
    }

    private void SaveList(DbContext db, List<Article> list)
    {
        //保存上传记录
        var tableToInsert = Tools.ListToDataTable(list);
        string cnstr = db.Database.Connection.ConnectionString;
        using (var sqlBC = new SqlBulkCopy(cnstr))
        {
            sqlBC.DestinationTableName = "Art.Article";
            sqlBC.BatchSize = ;
            sqlBC.BulkCopyTimeout = ;
            sqlBC.WriteToServer(tableToInsert);
        }
    }

    //更新测试
    protected void Button2_Click(object sender, EventArgs e)
    {
        Debug.Print("测试数据更新方法速度比较");
        Debug.Print("1.ef直接更新");

        //EFUpdate1(10000);
        //EFUpdate2(10000);
        SqlDataAdapterUpdate();
    }

    private void EFUpdate1(int count)
    {
        var sp = new Stopwatch();
        sp.Start();
        using (var da = new THCommon())
        {
            var list = da.Articles.Take().ToList();

            sp.Stop();
            Debug.Print("ToList = " + sp.ElapsedMilliseconds);
            sp.Restart();

            list.ForEach(t => t.Area = t.Height * t.Price);
            sp.Stop();
            Debug.Print("ForEach = " + sp.ElapsedMilliseconds);
            sp.Restart();

            da.SaveChanges();

            sp.Stop();
            Debug.Print("SaveChanges = " + sp.ElapsedMilliseconds);
            sp.Restart();
        }
    }

    private void EFUpdate2(int count)
    {
        var sp = new Stopwatch();
        sp.Start();
        using (var da = new THCommon())
        {
            var list = da.Articles.Take().ToList();

            var sql = "update art.article set Area = Height * Price  where  createtime<'2017-01-07 10:13:54.870' ";

            da.Database.ExecuteSqlCommand(sql);

            sp.Stop();
            Debug.Print("ExecuteSqlCommand = " + sp.ElapsedMilliseconds);
            sp.Restart();
        }
    }

    private void SqlDataAdapterUpdate()
    {
        var sp = new Stopwatch();
        sp.Start();
        using (var da = new THCommon())
        {
            var conn = (SqlConnection)da.Database.Connection;

            //设置select查询命令，SqlCommandBuilder要求至少有select命令
            var selectCMD = new SqlCommand("select * from art.article where  createtime<'2017-01-07 10:13:54.870'", conn);
            var dt = new DataTable();
            var sda = new SqlDataAdapter(selectCMD);

            //上面的语句中使用select 0，不是为了查询出数据，而是要查询出表结构以向DataTable中填充表结构
            sda.Fill(dt);

            foreach (DataRow row in dt.Rows)
            {
                row["Area"] = Convert.ToDecimal(row["Height"]) * Convert.ToDecimal(row["Price"]);
            }
            //SqlCommandBuilder scb = new SqlCommandBuilder(sda);

            var dtc = dt.GetChanges();
            SqlCommandBuilder scb = new SqlCommandBuilder(sda);

            sp.Stop();
            Debug.Print("SqlCommandBuilder = " + sp.ElapsedMilliseconds);
            sp.Restart();

            if (dtc != null)
            {
                //执行更新
                sda.Update(dtc);
            }

            ////使DataTable保存更新
            //dt.AcceptChanges();

            sp.Stop();
            Debug.Print("sda.Update = " + sp.ElapsedMilliseconds);
            sp.Restart();
        }

    }

    protected void Button3_Click(object sender, EventArgs e)
    {
        var sp = new Stopwatch();
        sp.Start();

        var list = new List<Article>();

        var isDeleteSql = true;

        using (var da = new THCommon())
        {
            if (isDeleteSql)
            {
                var start = Convert.ToDateTime("2017-01-16");
                var end = Convert.ToDateTime("2017-01-18");

                var toDeleteListIDS =
                    da.Articles.Where(
                        t =>
                            t.CreateTime > start &&
                            t.CreateTime < end).Select(t => t.ID).ToList();
                var ids = string.Join("','", toDeleteListIDS.ToArray());
                var sql = string.Format("delete  art.article   where  id in ('{0}') ", ids);

                da.Database.ExecuteSqlCommand(sql);

                sp.Stop();
                Debug.Print("ExecuteSqlCommand delete = " + sp.ElapsedMilliseconds);
                sp.Restart();
            }
            else
            {
                var dels = da.Articles.Take();

                da.Articles.RemoveRange(dels);
                da.SaveChanges();
                sp.Stop();
                Debug.Print("RemoveRange = " + sp.ElapsedMilliseconds);
                sp.Restart();
            }

        }
    }

    /// <summary>
    /// 先删除，再插入，在事务中执行
    /// </summary>
    private void DeleteAndInsert()
    {
        var rand = new Random();
        using (var da = new THCommon())
        {
            using (System.Data.Entity.DbContextTransaction dbTran = da.Database.BeginTransaction())
            {
                try
                {
                    var start = Convert.ToDateTime("2017-01-20");
                    var end = Convert.ToDateTime("2017-01-21");

                    var list = da.Articles.Where(t => t.CreateTime > start && t.CreateTime < end).ToList();
                    var ids = string.Join("','", list.Select(t => t.ID).ToArray());

                    //删除
                    var sql = string.Format("delete  art.article   where  id in ('{0}') ", ids);
                    da.Database.ExecuteSqlCommand(sql);

                    list.ForEach(delegate(Article art)
                    {
                        art.Height = ;
                        art.Number = ;
                        art.Weight = ;
                        art.Area = rand.Next();
                    });

                    SaveList(da, list);

                    //commit transaction
                    dbTran.Commit();
                }
                catch (Exception ex)
                {
                    //Rollback transaction if exception occurs
                    dbTran.Rollback();
                }

            }

        }
    }
    protected void Button4_Click(object sender, EventArgs e)
    {
        DeleteAndInsert();
    }

   protected void Button5_Click(object sender, EventArgs e)
    {
        //1.删除临时表
        //2.选择记录，并修改，并批插入表临时表
        //3.update from

        var sp = new Stopwatch();
        sp.Start();

        using (var da = new THCommon())
        {
            var list = da.Articles.Take(100000).ToList();

            sp.Stop();
            Debug.Print("ToList = " + sp.ElapsedMilliseconds);
            sp.Restart();

            list.ForEach(delegate(Article art)
            {
                art.Area = 1;
                art.Height = 2;
                art.Number = 3;
                art.Price = 4;
                art.Weight = 5;
            });

            sp.Stop();
            Debug.Print("ForEach = " + sp.ElapsedMilliseconds);
            sp.Restart();

            var sql = "truncate table art.articletmp";
            da.Database.ExecuteSqlCommand(sql);

            sp.Stop();
            Debug.Print("ExecuteSqlCommand truncate = " + sp.ElapsedMilliseconds);
            sp.Restart();

            //保存上传记录
            var tableToInsert = Tools.ListToDataTable(list);
            string cnstr = da.Database.Connection.ConnectionString;
            using (var sqlBC = new SqlBulkCopy(cnstr))
            {
                sqlBC.DestinationTableName = "Art.ArticleTmp";
                sqlBC.BatchSize = 10000;
                sqlBC.BulkCopyTimeout = 300;
                sqlBC.WriteToServer(tableToInsert);
            }

            sp.Stop();
            Debug.Print(" SqlBulkCopy = " + sp.ElapsedMilliseconds);
            sp.Restart();

            sql = "update art.article set area = t0.area,height=t0.height,number = t0.number,price = t0.price,weight = t0.weight from art.articletmp t0 where art.article.id = t0.id";
            da.Database.ExecuteSqlCommand(sql);
            sp.Stop();
            Debug.Print("ExecuteSqlCommand update  = " + sp.ElapsedMilliseconds);
            sp.Restart();

        }
    }

　　

}