DbServerSyncProvider クラス

  • [アーティクル]

サーバー データベースと通信する汎用のサーバー同期プロバイダーを抽象化して、同期エージェントに対してデータベースの特定の実装が明らかにならないようにします。

名前空間: Microsoft.Synchronization.Data.Server
アセンブリ: Microsoft.Synchronization.Data.Server (microsoft.synchronization.data.server.dll 内)

構文

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

解説

サーバー同期プロバイダーの主要な動作は次のとおりです。

  • サーバー上の同期可能なテーブルに関する情報を格納します。

  • 前回の同期以降にサーバー データベースで発生した変更をアプリケーションで取得できるようにします。

  • 増分変更をサーバー データベースに適用します。

  • 競合する変更を検出します。

例

次のコード例では、DbServerSyncProvider から派生するクラスを作成します。クラスは、スナップショット同期の変更をダウンロードする接続とコマンドを作成します。完全なコンテキスト例でこのコードを表示するには、「データのスナップショットをクライアントにダウンロードする方法」を参照してください。

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

継承階層

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

スレッド セーフ

この型の public static (Visual Basic では Shared ) メンバーはすべて、スレッド セーフです。インスタンス メンバーの場合は、スレッド セーフであるとは限りません。

参照

リファレンス

DbServerSyncProvider メンバー
Microsoft.Synchronization.Data.Server 名前空間