SqlBulkCopyColumnMappingCollection クラス

定義

public ref class SqlBulkCopyColumnMappingCollection sealed : System::Collections::IList

public ref class SqlBulkCopyColumnMappingCollection sealed : System::Collections::CollectionBase

public sealed class SqlBulkCopyColumnMappingCollection : System.Collections.IList

public sealed class SqlBulkCopyColumnMappingCollection : System.Collections.CollectionBase

type SqlBulkCopyColumnMappingCollection = class
    interface ICollection
    interface IEnumerable
    interface IList

type SqlBulkCopyColumnMappingCollection = class
    inherit CollectionBase

Public NotInheritable Class SqlBulkCopyColumnMappingCollection
Implements IList

Public NotInheritable Class SqlBulkCopyColumnMappingCollection
Inherits CollectionBase

継承

Object

SqlBulkCopyColumnMappingCollection

継承

Object

CollectionBase

SqlBulkCopyColumnMappingCollection

実装

ICollection IEnumerable IList

例

次の例では、AdventureWorks サンプル データベースのソース テーブルから、同じデータベース内のコピー先テーブルにデータを一括コピーします。 変換先の列数はソース内の列数と一致しますが、列名と序数は一致しません。 SqlBulkCopyColumnMappingは、一括コピーのSqlBulkCopy列マップを作成するために、 オブジェクトの に追加されますSqlBulkCopyColumnMappingCollection。

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.BulkCopyDemoDifferentColumns;",
                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.BulkCopyDemoDifferentColumns";

                // The column order in the source doesn't match the order
                // in the destination, so ColumnMappings must be defined.
                bulkCopy.ColumnMappings.Add("ProductID", "ProdID");
                bulkCopy.ColumnMappings.Add("Name", "ProdName");
                bulkCopy.ColumnMappings.Add("ProductNumber", "ProdNum");

                // 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;";
    }
}

Imports System.Data.SqlClient

Module Module1
    Sub Main()
        Dim connectionString As String = GetConnectionString()

        ' Open a connection to the AdventureWorks database.
        Using sourceConnection As SqlConnection = _
           New SqlConnection(connectionString)
            sourceConnection.Open()

            ' Perform an initial count on the destination table.
            Dim commandRowCount As New SqlCommand( _
            "SELECT COUNT(*) FROM dbo.BulkCopyDemoDifferentColumns;", _
                sourceConnection)
            Dim countStart As Long = _
               System.Convert.ToInt32(commandRowCount.ExecuteScalar())
            Console.WriteLine("Starting row count = {0}", countStart)

            ' Get data from the source table as a SqlDataReader.
            Dim commandSourceData As SqlCommand = New SqlCommand( _
               "SELECT ProductID, Name, ProductNumber " & _
               "FROM Production.Product;", sourceConnection)
            Dim reader As SqlDataReader = commandSourceData.ExecuteReader

            ' Set up the bulk copy object.
            Using bulkCopy As SqlBulkCopy = New SqlBulkCopy(connectionString)
                bulkCopy.DestinationTableName = _
                "dbo.BulkCopyDemoDifferentColumns"

                ' The column order in the source doesn't match the order 
                ' in the destination, so ColumnMappings must be defined.
                bulkCopy.ColumnMappings.Add("ProductID", "ProdID")
                bulkCopy.ColumnMappings.Add("Name", "ProdName")
                bulkCopy.ColumnMappings.Add("ProductNumber", "ProdNum")

                ' Write from the source to the destination.
                Try
                    bulkCopy.WriteToServer(reader)

                Catch ex As Exception
                    Console.WriteLine(ex.Message)

                Finally
                    ' Close the SqlDataReader. The SqlBulkCopy
                    ' object is automatically closed at the end
                    ' of the Using block.
                    reader.Close()
                End Try
            End Using

            ' Perform a final count on the destination table
            ' to see how many rows were added.
            Dim countEnd As Long = _
                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()
        End Using
    End Sub

    Private Function GetConnectionString() As String
        ' 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;"
    End Function
End Module

注釈

列マッピングは、データ ソースとターゲット テーブルの間のマッピングを定義します。

マッピングが定義されていない場合 (つまり、コレクションは空です)、 ColumnMappings 列は序数の位置に基づいて暗黙的にマップされます。 これを行うには、コピー元のスキーマとコピー先のスキーマが一致する必要があります。 そうでない場合は、 InvalidOperationException がスローされます。

コレクションが ColumnMappings 空でない場合は、データ ソースに存在するすべての列を指定する必要はありません。 コレクションによってマップされていないものは無視されます。

コピー元とコピー先の列は、名前か序数のいずれかで参照できます。 名前による参照と序数による列参照を同じマッピング コレクションに混在させることができます。

プロパティ

メソッド

明示的なインターフェイスの実装

拡張メソッド

適用対象

こちらもご覧ください

• SQL Server でのバルク コピー操作
• ADO.NET の概要