做网站到a5卖站赚钱,优化防控工作的二十条措施,网页设计与网站建设分析,深圳东门有什么好玩的使用 SqlBulkCopy 类只能向 SQL Server 表写入数据。但是#xff0c;数据源不限于 SQL Server#xff1b;可以使用任何数据源#xff0c;只要数据可加载到 DataTable 实例或可使用 IDataReader 实例读取数据 使用Datatable作为数据源的方式#xff1a;下面的代码使用到了Co…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 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 1;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 Securitytrue; Initial CatalogAdventureWorks;;}
} View Code 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.FromTopBrand(TopBrand._.ID -1, 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};CreateDtByItemTopBrand(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 CreateDtByItemT(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, ListBrandSellDataItem brandselldataitems){try{var dt bisdal.FromTopBrand(TopBrand._.ID -1, 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};CreateDtByItemTopBrand(topbrand, dt);}catch (Exception ex){Logger.Error(ex.ToString());continue;}}BulkWriteToServer(con, TopBrand, dt);}catch (Exception ex){throw new Exception(CreateTopBrandData: ex.ToString());}} 转载于:https://www.cnblogs.com/LittleFeiHu/p/4050391.html
