SqlBulkCopyColumnOrderHint.Column 屬性

定義

命名空間:

Microsoft.Data.SqlClient

組件:

Microsoft.Data.SqlClient.dll

套件:

Microsoft.Data.SqlClient v5.2.0

要提供提示之目的地資料表中的目的地資料行名稱。

public:
 property System::String ^ Column { System::String ^ get(); void set(System::String ^ value); };

public string Column { get; set; }

member this.Column : string with get, set

Public Property Column As String

屬性值

String

        The string value of the 

Column 屬性。

例外狀況

ArgumentException

此值為 null 或空的。

範例

下列範例會從 AdventureWorks 範例資料庫中的來源資料表，將資料大量複製到相同資料庫中的目的地資料表。 SqlBulkCopyColumnOrderHint 物件是用來定義 ProductNumber 目的地資料行的排序次序。

重要

除非您已建立工作資料表，如 大量複製範例安裝程式中所述，否則不會執行此範例。 這個程式碼僅是為了示範使用 SqlBulkCopy 的語法而提供。 如果來源和目的地資料表位於相同的SQL Server實例中，使用 Transact-SQL INSERT … SELECT 語句來複製資料會比較簡單且更快速。

using System;
using System.Data;
using Microsoft.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();

            // Set up the bulk copy object.
            using (SqlBulkCopy bulkCopy =
                       new SqlBulkCopy(connectionString))
            {
                bulkCopy.DestinationTableName =
                    "dbo.BulkCopyDemoMatchingColumns";

                // Setup an order hint for the ProductNumber column.
                SqlBulkCopyColumnOrderHint hintNumber =
                    new SqlBulkCopyColumnOrderHint("number", SortOrder.Ascending);
                hintNumber.Column = "ProductNumber";
                bulkCopy.ColumnOrderHints.Add(hintNumber);

                // Write from the source to the destination.
                try
                {
                    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;";
    }
}

備註

ArgumentException如果指定 null 或空字串，則會擲回 。