SqlBulkCopy Класс

Определение

public ref class SqlBulkCopy sealed : IDisposable

public sealed class SqlBulkCopy : IDisposable

type SqlBulkCopy = class
    interface IDisposable

Public NotInheritable Class SqlBulkCopy
Implements IDisposable

Наследование

Object

SqlBulkCopy

Реализации

IDisposable

Примеры

Следующее консольное приложение показывает, как загрузить данные с помощью класса SqlBulkCopy.The following console application demonstrates how to load data using the SqlBulkCopy class. В этом примере объект SqlDataReader используется, чтобы скопировать данные из таблицы Production.Product в базе данных SQL Server AdventureWorks в такую же таблицу в этой же базе данных.In this example, a SqlDataReader is used to copy data from the Production.Product table in the SQL Server AdventureWorks database to a similar table in the same database.

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.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();

            // Open the destination connection. In the real world you would
            // not use SqlBulkCopy to move data from one table to the other
            // in the same database. This is for demonstration purposes only.
            using (SqlConnection destinationConnection =
                       new SqlConnection(connectionString))
            {
                destinationConnection.Open();

                // Set up the bulk copy object.
                // Note that the column positions in the source
                // data reader match the column positions in
                // the destination table so there is no need to
                // map columns.
                using (SqlBulkCopy bulkCopy =
                           new SqlBulkCopy(destinationConnection))
                {
                    bulkCopy.DestinationTableName =
                        "dbo.BulkCopyDemoMatchingColumns";

                    try
                    {
                        // Write from the source to the destination.
                        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.BulkCopyDemoMatchingColumns;", _
                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 New SqlCommand( _
               "SELECT ProductID, Name, ProductNumber " & _
               "FROM Production.Product;", sourceConnection)
            Dim reader As SqlDataReader = commandSourceData.ExecuteReader

            ' Open the destination connection. In the real world you would 
            ' not use SqlBulkCopy to move data from one table to the other   
            ' in the same database. This is for demonstration purposes only.
            Using destinationConnection As SqlConnection = _
                New SqlConnection(connectionString)
                destinationConnection.Open()

                ' Set up the bulk copy object. 
                ' The column positions in the source data reader 
                ' match the column positions in the destination table, 
                ' so there is no need to map columns.
                Using bulkCopy As SqlBulkCopy = _
                  New SqlBulkCopy(destinationConnection)
                    bulkCopy.DestinationTableName = _
                    "dbo.BulkCopyDemoMatchingColumns"

                    Try
                        ' Write from the source to the destination.
                        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 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

Комментарии

Microsoft SQL Server включает популярную программу командной строки с именем bcp для перемещения данных из одной таблицы в другую, будь то один сервер или между серверами.Microsoft SQL Server includes a popular command-prompt utility named bcp for moving data from one table to another, whether on a single server or between servers. SqlBulkCopyКласс позволяет создавать решения для управляемого кода, которые предоставляют аналогичные функциональные возможности.The SqlBulkCopy class lets you write managed code solutions that provide similar functionality. Существуют другие способы загрузки данных в таблицу SQL Server (например, с помощью инструкции INSERT), но SqlBulkCopy делает это значительно быстрее.There are other ways to load data into a SQL Server table (INSERT statements, for example), but SqlBulkCopy offers a significant performance advantage over them.

Класс SqlBulkCopy можно использовать для записи данных только в таблицы SQL Server.The SqlBulkCopy class can be used to write data only to SQL Server tables. Однако источник данных не ограничен SQL Server; любой источник данных можно использовать при условии, что данные могут быть загружены в DataTable экземпляр или прочитаны с помощью IDataReader экземпляра.However, the data source is not limited to SQL Server; any data source can be used, as long as the data can be loaded to a DataTable instance or read with a IDataReader instance.

SqlBulkCopy завершается ошибкой при выполнении DataTable SqlDateTime многостраничной загрузки столбца типа в SQL Server столбец, тип которого является одним из типов даты и времени, добавленных в SQL Server 2008.SqlBulkCopy will fail when bulk loading a DataTable column of type SqlDateTime into a SQL Server column whose type is one of the date/time types added in SQL Server 2008.

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