Classe DbServerSyncProvider

Abstrai um provedor de sincronização de servidor genérico que se comunica com o banco de dados do servidor e protege o agente de sincronização contra a implementação específica do banco de dados.

Namespace: Microsoft.Synchronization.Data.Server
Assembly: Microsoft.Synchronization.Data.Server (em microsoft.synchronization.data.server.dll)

Sintaxe

'Declaração
<SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase")> _
Public Class DbServerSyncProvider
    Inherits ServerSyncProvider
    Implements IDisposable
'Uso
Dim instance As DbServerSyncProvider

[SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase")] 
public class DbServerSyncProvider : ServerSyncProvider, IDisposable

[SuppressMessageAttribute(L"Microsoft.Naming", L"CA1706:ShortAcronymsShouldBeUppercase")] 
public ref class DbServerSyncProvider : public ServerSyncProvider, IDisposable

/** @attribute SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase") */ 
public class DbServerSyncProvider extends ServerSyncProvider implements IDisposable

SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase") 
public class DbServerSyncProvider extends ServerSyncProvider implements IDisposable

Comentários

As principais atividades do provedor de sincronização do servidor são:

• Armazena informações sobre as tabelas no servidor habilitadas para sincronização.

• Permite que os aplicativos recuperem as alterações ocorridas no banco de dados do servidor desde a última sincronização.

• Aplica alterações incrementais no banco de dados do servidor.

• Detecta alterações em conflito.

Exemplo

O exemplo de código a seguir cria uma classe derivada de DbServerSyncProvider. A classe cria uma conexão e comandos para baixar alterações para sincronização de instantâneo. Para exibir esse código no contexto de um exemplo completo, consulte Como baixar um instantâneo dos dados em um cliente.

public class SampleServerSyncProvider : DbServerSyncProvider
{
    public SampleServerSyncProvider()
    {
        //Create a connection to the sample server database.
        Utility util = new Utility();
        SqlConnection serverConn = new SqlConnection(Utility.ConnStr_DbServerSync);
        this.Connection = serverConn;
      
        //Create a SyncAdapter for each table, and then define
        //the command to select rows from the table. With the Snapshot
        //option, you do not download incremental changes. However,
        //you still use the SelectIncrementalInsertsCommand to select
        //the rows to download for each snapshot. The commands include
        //only those columns that you want on the client.

        //Customer table.
        SyncAdapter customerSyncAdapter = new SyncAdapter("Customer");
        SqlCommand customerIncrInserts = new SqlCommand();
        customerIncrInserts.CommandText = 
            "SELECT CustomerId, CustomerName, SalesPerson, CustomerType " +
            "FROM Sales.Customer";
        customerIncrInserts.Connection = serverConn;
        customerSyncAdapter.SelectIncrementalInsertsCommand = customerIncrInserts;
        this.SyncAdapters.Add(customerSyncAdapter);

        //OrderHeader table.
        SyncAdapter orderHeaderSyncAdapter = new SyncAdapter("OrderHeader");
        SqlCommand orderHeaderIncrInserts = new SqlCommand();
        orderHeaderIncrInserts.CommandText = 
            "SELECT OrderId, CustomerId, OrderDate, OrderStatus " +
            "FROM Sales.OrderHeader";
        orderHeaderIncrInserts.Connection = serverConn;
        orderHeaderSyncAdapter.SelectIncrementalInsertsCommand = orderHeaderIncrInserts;
        this.SyncAdapters.Add(orderHeaderSyncAdapter);
        
        //OrderDetail table.
        SyncAdapter orderDetailSyncAdapter = new SyncAdapter("OrderDetail");
        SqlCommand orderDetailIncrInserts = new SqlCommand();            
        orderDetailIncrInserts.CommandText = 
            "SELECT OrderDetailId, OrderId, Product, Quantity " +
            "FROM Sales.OrderDetail";
        orderDetailIncrInserts.Connection = serverConn;
        orderDetailSyncAdapter.SelectIncrementalInsertsCommand = orderDetailIncrInserts;
        this.SyncAdapters.Add(orderDetailSyncAdapter);
    }
}

Public Class SampleServerSyncProvider
    Inherits DbServerSyncProvider

    Public Sub New()
        'Create a connection to the sample server database.
        Dim util As New Utility()
        Dim serverConn As New SqlConnection(Utility.ConnStr_DbServerSync)
        Me.Connection = serverConn

        'Create a SyncAdapter for each table, and then define
        'the command to select rows from the table. With the Snapshot
        'option, you do not download incremental changes. However,
        'you still use the SelectIncrementalInsertsCommand to select
        'the rows to download for each snapshot. The commands include
        'only those columns that you want on the client.
        'Customer table.
        Dim customerSyncAdapter As New SyncAdapter("Customer")
        Dim customerIncrInserts As New SqlCommand()
        customerIncrInserts.CommandText = _
            "SELECT CustomerId, CustomerName, SalesPerson, CustomerType " _
          & "FROM Sales.Customer"
        customerIncrInserts.Connection = serverConn
        customerSyncAdapter.SelectIncrementalInsertsCommand = customerIncrInserts
        Me.SyncAdapters.Add(customerSyncAdapter)

        'OrderHeader table.
        Dim orderHeaderSyncAdapter As New SyncAdapter("OrderHeader")
        Dim orderHeaderIncrInserts As New SqlCommand()
        orderHeaderIncrInserts.CommandText = _
            "SELECT OrderId, CustomerId, OrderDate, OrderStatus " _
          & "FROM Sales.OrderHeader"
        orderHeaderIncrInserts.Connection = serverConn
        orderHeaderSyncAdapter.SelectIncrementalInsertsCommand = orderHeaderIncrInserts
        Me.SyncAdapters.Add(orderHeaderSyncAdapter)

        'OrderDetail table.
        Dim orderDetailSyncAdapter As New SyncAdapter("OrderDetail")
        Dim orderDetailIncrInserts As New SqlCommand()
        orderDetailIncrInserts.CommandText = _
            "SELECT OrderDetailId, OrderId, Product, Quantity " _
          & "FROM Sales.OrderDetail"
        orderDetailIncrInserts.Connection = serverConn
        orderDetailSyncAdapter.SelectIncrementalInsertsCommand = orderDetailIncrInserts
        Me.SyncAdapters.Add(orderDetailSyncAdapter)

    End Sub 'New
End Class 'SampleServerSyncProvider

Hierarquia de herança

System.Object
   Microsoft.Synchronization.SyncProvider
     Microsoft.Synchronization.Data.ServerSyncProvider
      Microsoft.Synchronization.Data.Server.DbServerSyncProvider

Segurança de thread

Qualquer membro estático público (Compartilhado no Visual Basic) deste tipo é protegido por thread. Não há garantia de que qualquer membro de instância esteja protegido por thread.

Consulte também

Referência

Membros DbServerSyncProvider
Namespace Microsoft.Synchronization.Data.Server