Classe DbServerSyncProvider

Astrae un provider di sincronizzazione server generico che comunica con il database server e protegge l'agente di sincronizzazione dall'implementazione specifica del database.

Spazio dei nomi: Microsoft.Synchronization.Data.Server
Assembly: Microsoft.Synchronization.Data.Server (in microsoft.synchronization.data.server.dll)

Sintassi

'Dichiarazione
<SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase")> _
Public Class DbServerSyncProvider
    Inherits ServerSyncProvider
    Implements IDisposable
'Utilizzo
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

Osservazioni

Le attività principali del provider di sincronizzazione server sono le seguenti:

• Memorizza informazioni sulle tabelle nel server abilitate alla sincronizzazione.

• Attiva le applicazioni destinate al recupero delle modifiche che si sono verificate nel database server a partire dall'ultima sincronizzazione.

• Applica le modifiche incrementali al database server.

• Rileva le modifiche in conflitto.

Esempio

Nell'esempio di codice seguente viene creata una classe che deriva da DbServerSyncProvider. La classe crea una connessione e i comandi per scaricare le modifiche per la sincronizzazione snapshot. Per visualizzare questo codice nel contesto di un esempio completo, vedere Procedura: scaricare uno snapshot di dati in un client.

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

Gerarchia di ereditarietà

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

Thread Safety

Tutti i membri statici pubblici (Shared in Visual Basic) di questo tipo sono thread safe. I membri di istanza non hanno garanzia di essere thread safe.

Vedere anche

Riferimento

Membri DbServerSyncProvider
Spazio dei nomi Microsoft.Synchronization.Data.Server