使用WCF和Sync Framework通过HTTP同步SQL Server 2008数据库

Question

有没有人在这里使用Sync Framework并通过WCF端点进行同步？请分享代码示例或示例项目.我特意寻找离线场景,其中客户端仅在线从服务器获取更新.

Answer 1

我做了以下操作,以使Sync Framework使用WCF与SQL Server 2008一起工作

• 在SQL Server 2008中启用了更改跟踪
• 为参与同步的表启用更改跟踪
• 添加了名为anchor的元数据表
• 添加了一个表来跟踪名为"guid"的客户端ID
• 使用MSF的codeplex项目站点提供的SqlExpressClientSyncProvider作为Client Sync Provider

• 使用SqlSyncAdapterBuilder为参与Sync的表构建适配器

  foreach (var item in anchorTables)
  {
      // Use adapter builder to generate T-SQL for querying change tracking data and CRUD
      SqlSyncAdapterBuilder builder = new SqlSyncAdapterBuilder();
      builder.Connection = new SqlConnection(this.connectionStringFactory.ConnectionString);
      builder.ChangeTrackingType = ChangeTrackingType.SqlServerChangeTracking;
      builder.SyncDirection = SyncDirection.Bidirectional;
      builder.TableName = item.TableName;
      // Get sync adapters from builder
      SyncAdapter clientAdapter = builder.ToSyncAdapter();
      clientAdapter.TableName = item.TableName;
      this.clientSyncProvider.SyncAdapters.Add(clientAdapter);
  }
  

• 添加了锚点命令

  SqlCommand anchroCommand =
     new SqlCommand { CommandText = "SELECT @" 
        + SyncSession.SyncNewReceivedAnchor 
        + " = change_tracking_current_version()" };
  
  anchroCommand.Parameters.Add("@" 
        + SyncSession.SyncNewReceivedAnchor, SqlDbType.BigInt)
        .Direction = ParameterDirection.Output;
  
  this.clientSyncProvider.SelectNewAnchorCommand = anchroCommand;
  

• 使用DbServerSyncProvider实例作为服务器同步提供程序实现WCF服务.您将生成同步适配器并设置锚命令,如服务器提供程序的上一步所示.

  [ServiceContract]
  public interface ISyncService
  {
      [OperationContract]
      SyncContext ApplyChanges(SyncGroupMetadata groupMetadata, DataSet dataSet, SyncSession syncSession);
      [OperationContract]
      SyncContext GetChanges(SyncGroupMetadata groupMetadata, SyncSession syncSession);
      [OperationContract]
      SyncSchema GetSchema(Collection<string> tableNames, SyncSession syncSession);
      [OperationContract]
      SyncServerInfo GetServerInfo(SyncSession syncSession);
  }
  

• 创建了一个实现ServerSyncProvider的代理类来访问WCF服务

  public class DbServerSyncProviderProxy : ServerSyncProvider
  {
      SyncServiceProxy.SyncServiceClient serviceProxy = new SyncServiceProxy.SyncServiceClient();
      public override SyncContext ApplyChanges(SyncGroupMetadata groupMetadata, DataSet dataSet, SyncSession syncSession)
      {
          return serviceProxy.ApplyChanges(groupMetadata, dataSet, syncSession);
      }
  }
  

• 创建了一个SyncAgent实例,并使用代理类实例设置RemoteProvider,该实例用于访问WCF服务.LocalProvider设置了SqlExpressClientSyncProvider的实例
• 将表和同步组添加到SyncAgent配置
• SyncAgent.Synchronize()