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();

        }

    }

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