详解C#把DataTable中数据一次插入数据库的方法

<connectionStrings>
  <add name="oleConStr" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="/>
  
  <add name="sqlConStr" connectionString ="server=tiantiankaixing;database=新建数据库;trusted_connection=sspi"/>
 </connectionStrings>

public static string OleConStr = ConfigurationManager.ConnectionStrings["oleConStr"].ConnectionString ;

 public static DataTable OleGetDataTable(string sql, string filePath)
    {
      
      string a = OleConStr + filePath;
      using (OleDbConnection conn = new OleDbConnection(a))
      {

        using (OleDbDataAdapter da = new OleDbDataAdapter(sql, conn))
        {
          try
          {
            conn.Open();
            DataTable dt = new DataTable();
            da.Fill(dt);
            return dt;
          }
          catch (Exception ex)
          {
            throw ex;
          }
          finally
          {
            if (conn.State == ConnectionState.Open)
              conn.Close();
          }
        }
      }
    }

string sql = "select Id,Time from checkinout";
DataTable dt = AcHelper.OleGetDataTable(sql, @"F:\project\tiantiankaixing\admin.mdb");

public static void DataTableToSQLServer(DataTable dt,string connectString)
    {
      string connectionString = connectString;

      using (SqlConnection destinationConnection = new SqlConnection(connectionString))
      {
        destinationConnection.Open();

        using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection))
        {


          try
          {

            bulkCopy.DestinationTableName = "checkinout";//要插入的表的表名
            bulkCopy.BatchSize = dt.Rows.Count;
            bulkCopy.ColumnMappings.Add("ID", "ID");//映射字段名 DataTable列名 ,数据库 对应的列名 
            bulkCopy.ColumnMappings.Add("TIME", "TIME");
            
            bulkCopy.WriteToServer(dt);
            System.Windows.Forms.MessageBox.Show("插入成功");
          }
          catch (Exception ex)
          {
            Console.WriteLine(ex.Message);
          }
          finally
          {
            

          }
        }


      }

    }

string localCon = "server=tiantiankaixing;database=Test;trusted_connection=sspi";
Entity.DataTableToSQLServer(dt, localCon);

public void Test()
    {
      string connectionString = "server=tiantiankaixing;database=新建数据库;trusted_connection=sspi";
      
      using (SqlConnection sourceConnection =
            new SqlConnection(connectionString))
      {
        sourceConnection.Open();
        //获取读取的表总行数
        SqlCommand commandRowCount = new SqlCommand("select count(*) from student",sourceConnection);
        long countStart = System.Convert.ToInt32(commandRowCount.ExecuteScalar());
        

        //使用SqlDataReader读取源数据
        SqlCommand commandSourceData = new SqlCommand("select * from student", sourceConnection);
        SqlDataReader reader =commandSourceData.ExecuteReader();

        //测试用，把数据从一个表批量插入到另一个表
        //现实生活中肯定不会
        using (SqlConnection destinationConnection =new SqlConnection(connectionString))
        {
          destinationConnection.Open();

          //创建一个SQlBulkCopy对象
          //指定目标表名
          //指定要插入的行数
          //指定对应的映射
          using (SqlBulkCopy bulkCopy =new SqlBulkCopy(destinationConnection))
          {
            bulkCopy.DestinationTableName ="test";
            bulkCopy.BatchSize = 1;
            bulkCopy.ColumnMappings.Add("数据源列名","目标列名");

            try
            {
              
              bulkCopy.WriteToServer(reader);
            }
            catch (Exception ex)
            {
              Console.WriteLine(ex.Message);
            }
            finally
            {
              reader.Close();
            }
          }
        }


      }
    }