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SqlBulkCopyColumnMappingCollection Class

Note: This class is new in the .NET Framework version 2.0.

Collection of SqlBulkCopyColumnMapping objects that inherits from CollectionBase.

Namespace: System.Data.SqlClient
Assembly: System.Data (in system.data.dll)

public sealed class SqlBulkCopyColumnMappingCollection : CollectionBase
public final class SqlBulkCopyColumnMappingCollection extends CollectionBase
public final class SqlBulkCopyColumnMappingCollection extends CollectionBase

Column mappings define the mapping between data source and the target table.

If mappings are not defined—that is, the ColumnMappings collection is empty—the columns are mapped implicitly based on ordinal position. For this to work, source and target schemas must match. If they do not, an InvalidOperationException is thrown.

If the ColumnMappings collection is not empty, not every column present in the data source has to be specified. Those not mapped by the collection are ignored.

You can refer to source and target columns by either name or ordinal. You can mix by-name and by-ordinal column references in the same mappings collection.

The following example bulk copies data from a source table in the AdventureWorks sample database to a destination table in the same database. Although the number of columns in the destination matches the number of columns in the source, the column names and ordinal positions do not match. SqlBulkCopyColumnMapping are added to the SqlBulkCopyColumnMappingCollection for the SqlBulkCopy object to create a column map for the bulk copy.

NoteImportant:

This sample will not run unless you have created the work tables as described in Creating Tables for the Bulk Copy Examples. This code is provided to demonstrate the syntax for using SqlBulkCopy only. If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data.

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;";
    


System.Object
   System.Collections.CollectionBase
    System.Data.SqlClient.SqlBulkCopyColumnMappingCollection

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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