Operações de cópia em massa única

A abordagem mais simples para executar uma operação de cópia em massa do SQL Server é executar uma única operação em um banco de dados. Por padrão, uma operação de cópia em massa é executada como uma operação isolada: a operação de cópia ocorre de forma não transacionada, sem oportunidade de revertê-la.

As etapas gerais para executar uma operação de cópia em massa são as seguintes:

1. Conecte-se ao servidor de origem e obtenha os dados a serem copiados. Os dados também podem vir de outras fontes, se puderem ser recuperados de um IDataReader ou DataTable objeto.

2. Conecte-se ao servidor de destino (a menos que pretenda SqlBulkCopy estabelecer uma ligação para si).

3. Crie um SqlBulkCopy objeto, definindo as propriedades necessárias.

4. Defina a DestinationTableName propriedade para indicar a tabela alvo para a operação de inserção em massa.

5. Ligue para um dos WriteToServer métodos.

6. Opcionalmente, atualiza as propriedades e liga WriteToServer novamente se necessário.

7. Chame Close ou envolva as operações de cópia em massa em uma instrução Using.

Exemplo

O aplicativo de console a seguir demonstra como carregar dados usando a SqlBulkCopy classe. Neste exemplo, a SqlDataReader é usado para copiar dados da tabela Production.Product na base de dados SQL Server AdventureWorks para uma tabela semelhante na mesma base de dados.

static void Main()
{
    var connectionString = GetConnectionString();
    // Open a sourceConnection to the AdventureWorks database.
    using (SqlConnection sourceConnection =
               new(connectionString))
    {
        sourceConnection.Open();

        // Perform an initial count on the destination table.
        SqlCommand commandRowCount = new(
            "SELECT COUNT(*) FROM " +
            "dbo.BulkCopyDemoMatchingColumns;",
            sourceConnection);
        long countStart = Convert.ToInt32(
            commandRowCount.ExecuteScalar());
        Console.WriteLine($"Starting row count = {countStart}");

        // Get data from the source table as a SqlDataReader.
        SqlCommand commandSourceData = new(
            "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(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(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 = Convert.ToInt32(
                commandRowCount.ExecuteScalar());
            Console.WriteLine($"Ending row count = {countEnd}");
            Console.WriteLine($"{countEnd - countStart} rows were added.");
            Console.WriteLine("Press Enter to finish.");
            Console.ReadLine();
        }
    }
}

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
        Throw New NotImplementedException()
    End Function
End Module

Executando uma operação de cópia em massa usando Transact-SQL e a classe de comando

O exemplo a seguir ilustra como usar o ExecuteNonQuery método para executar a instrução BULK INSERT.

Using connection As SqlConnection = New SqlConnection(connectionString)
Dim queryString As String = _
    "BULK INSERT Northwind.dbo.[Order Details] FROM " & _
    "'f:\mydata\data.tbl' WITH (FORMATFILE='f:\mydata\data.fmt' )"
connection.Open()
SqlCommand command = New SqlCommand(queryString, connection);

command.ExecuteNonQuery()
End Using

using (SqlConnection connection = New SqlConnection(connectionString))
{
string queryString =  "BULK INSERT Northwind.dbo.[Order Details] " +
    "FROM 'f:\mydata\data.tbl' " +
    "WITH ( FORMATFILE='f:\mydata\data.fmt' )";
connection.Open();
SqlCommand command = new SqlCommand(queryString, connection);

command.ExecuteNonQuery();
}

Consulte também

• Operações de cópia em massa no SQL Server
• Visão geral ADO.NET