SqlBulkCopy 批量复制数据到数据表

使用 SqlBulkCopy 类只能向 SQL Server 表写入数据。但是，数据源不限于 SQL Server；可以使用任何数据源，只要数据可加载到 DataTable 实例或可使用 IDataReader 实例读取数据

1. 使用Datatable作为数据源的方式：

下面的代码使用到了ColumnMappings，因为目标表和数据源Datatable的结构不一致，需要这么一个映射来指定对应关系

  public string SaveJHCData(LzShopBasicData[] datas)
        {
            var result = new AResult();
            SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["**"].ConnectionString);
            con.Open();
            foreach (var item in datas)
            {
 
                Logger.Info("数据更新处理，店铺名称：" + item.ShopName + "数据日期" + item.SellDate);
                try
                {
                    using (TransactionScope scope = new TransactionScope())
                    {
 
                        DataTable JHCOrderItemsdt = SaveJHCOrderItemsData(item);
                        SqlBulkCopy JHCOrderItemscopy = new SqlBulkCopy(con);
                        JHCOrderItemscopy.ColumnMappings.Add("orderId", "orderId");
                        JHCOrderItemscopy.ColumnMappings.Add("auctionId", "auctionId");
                        JHCOrderItemscopy.ColumnMappings.Add("itemTitle", "itemTitle");
                        JHCOrderItemscopy.ColumnMappings.Add("tradeAmt", "tradeAmt");
                        JHCOrderItemscopy.ColumnMappings.Add("alipayNum", "alipayNum");
                        JHCOrderItemscopy.ColumnMappings.Add("tradeTime", "tradeTime");
                        JHCOrderItemscopy.ColumnMappings.Add("uv", "uv");
                        JHCOrderItemscopy.ColumnMappings.Add("srcId", "srcId");
                        JHCOrderItemscopy.ColumnMappings.Add("srcName", "srcName");
                        JHCOrderItemscopy.ColumnMappings.Add("DataType", "DataType");
                        JHCOrderItemscopy.ColumnMappings.Add("DataDate", "DataDate");
                        JHCOrderItemscopy.ColumnMappings.Add("OrderSourceID", "OrderSourceID");
                        JHCOrderItemscopy.ColumnMappings.Add("ShopName", "ShopName");
                        JHCOrderItemscopy.DestinationTableName = "JHCOrderItems";
                        JHCOrderItemscopy.WriteToServer(JHCOrderItemsdt);
                        result.Updatedata += ;
                        result.UpdatedataText += item.SellDate + ",";
                        scope.Complete();
                        Logger.Info(item.SellDate + "事务提交");
                    }
                }
                catch (Exception ex)
                {
                    Logger.Error(ex.ToString());
                    continue;
                }
            }
            con.Close();
            return result.ToSerializeObject();
        }

2.使用IDataReader作为数据源的方式，这种方式个人认为用的很少，首先目标表和来源表两个数据库连接你都需要拿到，如果两个都可以拿到，一般直接操作sql就可以解决：

这里是直接拷贝的MSDN的代码，

用到的AdventureWorks数据库可以直接在网上下载到，

using System.Data.SqlClient;
 
class Program
{
    static void Main()
    {
        string connectionString = GetConnectionString();
        // Open a sourceConnection to the AdventureWorks database.
        using (SqlConnection sourceConnection =
                   new SqlConnection(connectionString))
        {
            sourceConnection.Open();
 
            // Perform an initial count on the destination table.
            SqlCommand commandRowCount = new SqlCommand(
                "SELECT COUNT(*) FROM " +
                "dbo.BulkCopyDemoMatchingColumns;",
                sourceConnection);
            long countStart = System.Convert.ToInt32(
                commandRowCount.ExecuteScalar());
            Console.WriteLine("Starting row count = {0}", countStart);
 
            // Get data from the source table as a SqlDataReader.
            SqlCommand commandSourceData = new SqlCommand(
                "SELECT ProductID, Name, " +
                "ProductNumber " +
                "FROM Production.Product;", sourceConnection);
            SqlDataReader reader =
                commandSourceData.ExecuteReader();
 
            // Open the destination connection. In the real world you would
            // not use SqlBulkCopy to move data from one table to the other
            // in the same database. This is for demonstration purposes only.
            using (SqlConnection destinationConnection =
                       new SqlConnection(connectionString))
            {
                destinationConnection.Open();
 
                // Set up the bulk copy object.
                // Note that the column positions in the source
                // data reader match the column positions in
                // the destination table so there is no need to
                // map columns.
                using (SqlBulkCopy bulkCopy =
                           new SqlBulkCopy(destinationConnection))
                {
                    bulkCopy.DestinationTableName =
                        "dbo.BulkCopyDemoMatchingColumns";
 
                    try
                    {
                        // Write from the source to the destination.
                        bulkCopy.WriteToServer(reader);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                    finally
                    {
                        // Close the SqlDataReader. The SqlBulkCopy
                        // object is automatically closed at the end
                        // of the using block.
                        reader.Close();
                    }
                }
 
                // Perform a final count on the destination
                // table to see how many rows were added.
                long countEnd = System.Convert.ToInt32(
                    commandRowCount.ExecuteScalar());
                Console.WriteLine("Ending row count = {0}", countEnd);
                Console.WriteLine("{0} rows were added.", countEnd - countStart);
                Console.WriteLine("Press Enter to finish.");
                Console.ReadLine();
            }
        }
    }
 
    private static string GetConnectionString()
        // To avoid storing the sourceConnection string in your code,
        // you can retrieve it from a configuration file.
    {
        return "Data Source=(local); " +
            " Integrated Security=true;" +
            "Initial Catalog=AdventureWorks;";
    }
}

实战：借助类型反射动态构建Datatable数据源,通过SqlBulkCopy批量保存入库

1.获取一张空的Datatable

var dt = bisdal.From<TopBrand>(TopBrand._.ID == -, OrderByClip.Default).ToDataTable();

2.填充DataTable，这里是通过遍历外部的集合，把属性属性逐一赋值填充到目标Datatable

         foreach (var item in brandselldataitems)
                    {
                        try
                        {
 
                            TopBrand topbrand = new TopBrand
                            {
                                BrandIndex = item.mk,
                                BrandName = item.c58,
                                Date = date,
                                WinnerAmt = item.c60,
                                WinnerPeople = item.c62,
                                WinnerProNum = item.c61,
                                HotTaobaoCategoryID = cid
                            };
                            CreateDtByItem<TopBrand>(topbrand, dt);
                        }
                        catch (Exception ex)
                        {
                            Logger.Error(ex.ToString());
                            continue;
                        }
                    }

这里借助反射，遍历实体属性集合，动态构建DataTableRow对象

       private void CreateDtByItem<T>(T item, DataTable dt)
        {
            System.Reflection.PropertyInfo[] properties = item.GetType().GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);
            var newrow = dt.NewRow();
            foreach (System.Reflection.PropertyInfo pitem in properties)
            {
 
                string name = pitem.Name;
                if (name == "children")
                {
                    continue;
                }
                object value = pitem.GetValue(item, null);
                newrow[name] = value == null ? DBNull.Value : value;
            }
            dt.Rows.Add(newrow);
        }

3.保存入库，

     BulkWriteToServer(con, "TopBrand", dt);

这里因为目标表和数据源的Datatable数据结构一致，所以省去了ColumnMappings列映射的操作，可以直接WriteToServer保存

     private void BulkWriteToServer(SqlConnection con, string destinationtablename, DataTable sourcedt)
        {
            try
            {
                if (con.State == ConnectionState.Closed)
                {
                    con.Open();
                }
                SqlBulkCopy topbranddtcopy = new SqlBulkCopy(con);
                topbranddtcopy.DestinationTableName = destinationtablename;
                topbranddtcopy.WriteToServer(sourcedt);
                con.Close();
            }
            catch (Exception ex)
            {
                Logger.Error("批量新增数据:" + destinationtablename + "," + ex.ToString());
            }
        }

完整调用代码：

 private void CreateTopBrandData(int date, int cid, List<BrandSellDataItem> brandselldataitems)
        {
            try
            {
                var dt = bisdal.From<TopBrand>(TopBrand._.ID == -, OrderByClip.Default).ToDataTable();
                foreach (var item in brandselldataitems)
                {
                    try
                    {
 
                        TopBrand topbrand = new TopBrand
                        {
                            BrandIndex = item.mk,
                            BrandName = item.c58,
                            Date = date,
                            WinnerAmt = item.c60,
                            WinnerPeople = item.c62,
                            WinnerProNum = item.c61,
                            HotTaobaoCategoryID = cid
                        };
                        CreateDtByItem<TopBrand>(topbrand, dt);
                    }
                    catch (Exception ex)
                    {
                        Logger.Error(ex.ToString());
                        continue;
                    }
                }
                BulkWriteToServer(con, "TopBrand", dt);
            }
            catch (Exception ex)
            {
                throw new Exception("CreateTopBrandData:" + ex.ToString());
            }
        }