EF结合SqlBulkCopy实现高效的批量数据插入(转载)

批量插入 （17597条数据批量插入耗时1.7秒）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    using MvcApplication1.Models;
    using EntityFramework.Extensions;
    using System.ComponentModel;
    using System.Data;
    using System.Data.SqlClient;
    using System.Diagnostics;
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            Stopwatch sw = new Stopwatch(); //计时器
            sw.Start();//开始计时

            using (var db = new salesEntities())
            {

                List<location> entitys = db.location.ToList(); //构建集合，到时候会将这个集合数据批量插入到

                if (db.Database.Connection.State != ConnectionState.Open)
                {
                    db.Database.Connection.Open(); //打开Connection连接
                }

                //调用BulkInsert方法,将entitys集合数据批量插入到数据库的tolocation表中
                BulkInsert<location>((SqlConnection)db.Database.Connection, "tolocation", entitys);

                if (db.Database.Connection.State != ConnectionState.Closed)
                {
                    db.Database.Connection.Close(); //关闭Connection连接
                }
            }

            sw.Stop(); //结束计时
            string aa = sw.Elapsed.ToString();//批量插入了17597条数据。耗时1.7秒
            return View();
        }


        /// <summary>
        /// 批量插入
        /// </summary>
        /// <typeparam name="T">泛型集合的类型</typeparam>
        /// <param name="conn">连接对象</param>
        /// <param name="tableName">将泛型集合插入到本地数据库表的表名</param>
        /// <param name="list">要插入大泛型集合</param>
        public static void BulkInsert<T>(SqlConnection conn, string tableName, IList<T> list)
        {
            using (var bulkCopy = new SqlBulkCopy(conn))
            {
                bulkCopy.BatchSize = list.Count;
                bulkCopy.DestinationTableName = tableName;

                var table = new DataTable();
                var props = TypeDescriptor.GetProperties(typeof(T))

                    .Cast<PropertyDescriptor>()
                    .Where(propertyInfo => propertyInfo.PropertyType.Namespace.Equals("System"))
                    .ToArray();

                foreach (var propertyInfo in props)
                {
                    bulkCopy.ColumnMappings.Add(propertyInfo.Name, propertyInfo.Name);
                    table.Columns.Add(propertyInfo.Name, Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType);
                }

                var values = new object[props.Length];
                foreach (var item in list)
                {
                    for (var i = 0; i < values.Length; i++)
                    {
                        values[i] = props[i].GetValue(item);
                    }

                    table.Rows.Add(values);
                }

                bulkCopy.WriteToServer(table);
            }
        }

    }
}

使用EF扩展EntityFramework.Extended 对数据进行批量更新，和批量删除

首先去nuget上下载EntityFramework.Extended插件（搜索：EntityFramework.Extended） 安装后，在项目中引入using EntityFramework.Extensions; 名称空间

批量更新（17597条数据，批量更新耗时1.69秒）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    using MvcApplication1.Models;
    using EntityFramework.Extensions; //使用EF的EntityFramework.Extended插件需要引入此名称空间
    using System.Diagnostics;

    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            salesEntities db = new salesEntities();

            Stopwatch sw = new Stopwatch(); //计时器
            sw.Start();

            //调用插件的Update方法进行批量更新（不需要我们手动的db.SaveChanges()了）
            //db.location.Update(r => new location { version = 123 });//批量将location表里version字段数据更新为123

            db.tolocation.Where(r => r.locId < 100).Update(c => new tolocation { version = 236 }); //也可以带条件批量修改


            sw.Stop();
            string aa = sw.Elapsed.ToString();//批量更新了17597条数据。耗时1.69秒
            return View();
        }
    }
}

批量删除（17597条数据，批量删除耗时1.76秒）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    using MvcApplication1.Models;
    using EntityFramework.Extensions; //使用EF的EntityFramework.Extended插件需要引入此名称空间
    using System.Diagnostics;

    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            salesEntities db = new salesEntities();

            Stopwatch sw = new Stopwatch(); //计时器
            sw.Start();

            //调用插件的Delete方法进行批量删除（不需要我们手动的db.SaveChanges()了）
            //db.location.Delete(r => r.locId < 100000);

            db.location.Where(r => r.locId < 10000).Delete(); //当然我也可以这样写

            
            sw.Stop();
            string aa = sw.Elapsed.ToString();//批量删除了17597条数据。耗时1.76秒
            return View();
        }
    }
}

原文地址： https://blog.csdn.net/Fanbin168/article/details/51485969