SqlBulkCopyColumnMapping.SourceColumn Özellik

Tanım

Ad Alanı:

System.Data.SqlClient

Bütünleştirilmiş Kod:

System.Data.SqlClient.dll

Paket:

System.Data.SqlClient v4.8.6

Veri kaynağında eşlenen sütunun adı.

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

public string SourceColumn { get; set; }

member this.SourceColumn : string with get, set

Public Property SourceColumn As String

Özellik Değeri

String

özelliğinin SourceColumn dize değeri.

Örnekler

Aşağıdaki örnek , AdventureWorks örnek veritabanındaki bir kaynak tablodaki verileri aynı veritabanındaki hedef tabloya toplu olarak kopyalar. Hedefteki sütun sayısı kaynaktaki sütun sayısıyla eşleşse de, sütun adları ve sıralı konumlar eşleşmez. SqlBulkCopyColumnMapping nesneleri, toplu kopya için sütun eşlemesi oluşturmak için kullanılır.

Önemli

Bu örnek, Toplu Kopyalama Örneği Kurulumu'nda açıklandığı gibi iş tablolarını oluşturmadığınız sürece çalışmaz. Bu kod, yalnızca SqlBulkCopy kullanımına yönelik söz dizimini göstermek için sağlanır. Kaynak ve hedef tablolar aynı SQL Server örnekteyse, verileri kopyalamak için Transact-SQL INSERT … SELECT deyimi kullanmak daha kolay ve daha hızlıdır.

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";

                // Set up the column mappings source and destination.
                SqlBulkCopyColumnMapping mapID = new SqlBulkCopyColumnMapping();
                mapID.SourceColumn = "ProductID";
                mapID.DestinationColumn = "ProdID";
                bulkCopy.ColumnMappings.Add(mapID);

                SqlBulkCopyColumnMapping mapName = new SqlBulkCopyColumnMapping();
                mapName.SourceColumn = "Name";
                mapName.DestinationColumn = "ProdName";
                bulkCopy.ColumnMappings.Add(mapName);

                SqlBulkCopyColumnMapping mapNumber = new SqlBulkCopyColumnMapping();
                mapNumber.SourceColumn = "ProductNumber";
                mapNumber.DestinationColumn = "ProdNum";
                bulkCopy.ColumnMappings.Add(mapNumber);

                // 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"

                ' Set up the column mappings source and destination.
                Dim mapID As New SqlBulkCopyColumnMapping()
                mapID.SourceColumn = "ProductID"
                mapID.DestinationColumn = "ProdID"
                bulkCopy.ColumnMappings.Add(mapID)

                Dim mapName As New SqlBulkCopyColumnMapping()
                mapName.SourceColumn = "Name"
                mapName.DestinationColumn = "ProdName"
                bulkCopy.ColumnMappings.Add(mapName)

                Dim mapNumber As New SqlBulkCopyColumnMapping()
                mapNumber.SourceColumn = "ProductNumber"
                mapNumber.DestinationColumn = "ProdNum"
                bulkCopy.ColumnMappings.Add(mapNumber)

                ' 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

Açıklamalar

SourceColumn ve SourceOrdinal özellikleri birbirini dışlar. Son değer kümesi önceliklidir.

Ayrıca bkz.

• SQL Server’da Toplu Kopyalama İşlemleri
• ADO.NET’e Genel Bakış