我正在开发项目，我需要为脱机应用程序使用数据库同步。 在某种程度上我成功了，我完成了使用下面代码
的客户端到服务器的同步 DbServerSyncProvider serverSyncProvider = new DbServerSyncProvider();
SyncAgent syncAgent = new SyncAgent();
syncAgent.RemoteProvider = serverSyncProvider;
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
//
// 2. Prepare server db connection and attach it to the sync agent
//
builder["Data Source"] = textServerMachine.Text;
builder["integrated Security"] = true;
builder["Initial Catalog"] = "pub";
SqlConnection serverConnection = new SqlConnection(builder.ConnectionString);
serverSyncProvider.Connection = serverConnection;
//
// 3. Prepare client db connection and attach it to the sync provider
//
string connString = "Data Source=" + dbPathTextBox.Text;
if (false == File.Exists(dbPathTextBox.Text))
{
SqlCeEngine clientEngine = new SqlCeEngine(connString);
clientEngine.CreateDatabase();
clientEngine.Dispose();
}
SqlCeClientSyncProvider clientSyncProvider = new SqlCeClientSyncProvider(connString);
syncAgent.LocalProvider = clientSyncProvider;
//
// 4. Create SyncTables and SyncGroups
// To sync a table, a SyncTable object needs to be created and setup with desired properties:
// TableCreationOption tells the agent how to initialize the new table in the local database
// SyncDirection is how changes from with respect to client {Download, Upload, Bidirectional or Snapshot}
//
//
SyncTable tableOrders = new SyncTable("orders");
tableOrders.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
tableOrders.SyncDirection = SyncDirection.Bidirectional;
SyncTable tableOrderDetails = new SyncTable("order_details");
tableOrderDetails.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
tableOrderDetails.SyncDirection = SyncDirection.Bidirectional;
//
// Sync changes for both tables as one bunch, using SyncGroup object
// This is important if the tables has PK-FK relationship, grouping will ensure that
// and FK change won't be applied before its PK is applied
//
//
SyncGroup orderGroup = new SyncGroup("AllChanges");
tableOrders.SyncGroup = orderGroup;
tableOrderDetails.SyncGroup = orderGroup;
syncAgent.Configuration.SyncTables.Add(tableOrders);
syncAgent.Configuration.SyncTables.Add(tableOrderDetails);
//
// 5. Create sync adapter for each sync table and attach it to the server provider
// Following DataAdapter style in ADO.NET, SyncAdapte is the equivelent for
// Sync. SyncAdapterBuilder is a helper class to simplify the process of
// creating sync commands.
//
//
SqlSyncAdapterBuilder ordersBuilder = new SqlSyncAdapterBuilder();
ordersBuilder.Connection = serverConnection;
ordersBuilder.SyncDirection = SyncDirection.Bidirectional;
// base table
ordersBuilder.TableName = "orders";
ordersBuilder.DataColumns.Add("order_id");
ordersBuilder.DataColumns.Add("order_date");
// tombstone table
ordersBuilder.TombstoneTableName = "orders_tombstone";
ordersBuilder.TombstoneDataColumns.Add("order_id");
ordersBuilder.TombstoneDataColumns.Add("order_date");
// tracking\sync columns
ordersBuilder.CreationTrackingColumn = @"create_timestamp";
ordersBuilder.UpdateTrackingColumn = @"update_timestamp";
ordersBuilder.DeletionTrackingColumn = @"update_timestamp";
ordersBuilder.UpdateOriginatorIdColumn = @"update_originator_id";
SyncAdapter ordersSyncAdapter = ordersBuilder.ToSyncAdapter();
((SqlParameter)ordersSyncAdapter.SelectIncrementalInsertsCommand.Parameters["@sync_last_received_anchor"]).DbType = DbType.Binary;
((SqlParameter)ordersSyncAdapter.SelectIncrementalInsertsCommand.Parameters["@sync_new_received_anchor"]).DbType = DbType.Binary;
serverSyncProvider.SyncAdapters.Add(ordersSyncAdapter);
SqlSyncAdapterBuilder orderDetailsBuilder = new SqlSyncAdapterBuilder();
orderDetailsBuilder.SyncDirection = SyncDirection.Bidirectional;
orderDetailsBuilder.Connection = serverConnection;
// base table
orderDetailsBuilder.TableName = "order_details";
orderDetailsBuilder.DataColumns.Add("order_id");
orderDetailsBuilder.DataColumns.Add("order_details_id");
orderDetailsBuilder.DataColumns.Add("product");
orderDetailsBuilder.DataColumns.Add("quantity");
// tombstone table
orderDetailsBuilder.TombstoneTableName = "order_details_tombstone";
orderDetailsBuilder.TombstoneDataColumns.Add("order_id");
orderDetailsBuilder.TombstoneDataColumns.Add("order_details_id");
orderDetailsBuilder.TombstoneDataColumns.Add("product");
orderDetailsBuilder.TombstoneDataColumns.Add("quantity");
// tracking\sync columns
orderDetailsBuilder.CreationTrackingColumn = @"create_timestamp";
orderDetailsBuilder.UpdateTrackingColumn = @"update_timestamp";
orderDetailsBuilder.DeletionTrackingColumn = @"update_timestamp";
orderDetailsBuilder.UpdateOriginatorIdColumn = @"update_originator_id";
SyncAdapter orderDetailsSyncAdapter = orderDetailsBuilder.ToSyncAdapter();
((SqlParameter)orderDetailsSyncAdapter.SelectIncrementalInsertsCommand.Parameters["@sync_last_received_anchor"]).DbType = DbType.Binary;
((SqlParameter)orderDetailsSyncAdapter.SelectIncrementalInsertsCommand.Parameters["@sync_new_received_anchor"]).DbType = DbType.Binary;
serverSyncProvider.SyncAdapters.Add(orderDetailsSyncAdapter);
//
// 6. Setup provider wide commands
// There are two commands on the provider itself and not on a table sync adapter:
// SelectNewAnchorCommand: Returns the new high watermark for current sync, this value is
// stored at the client and used the low watermark in the next sync
// SelectClientIdCommand: Finds out the client ID on the server, this command helps
// avoid downloading changes that the client had made before and applied to the server
//
//
// select new anchor command
SqlCommand anchorCmd = new SqlCommand();
anchorCmd.CommandType = CommandType.Text;
anchorCmd.CommandText = "Select @" + SyncSession.SyncNewReceivedAnchor + " = @@DBTS"; // for SQL Server 2005 SP2, use "min_active_rowversion() - 1"
anchorCmd.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp).Direction = ParameterDirection.Output;
serverSyncProvider.SelectNewAnchorCommand = anchorCmd;
// client ID command (give the client id of 1)
// in remote server scenario (middle tear), this command will reference a local client table for the ID
SqlCommand clientIdCmd = new SqlCommand();
clientIdCmd.CommandType = CommandType.Text;
clientIdCmd.CommandText = "SELECT @" + SyncSession.SyncOriginatorId + " = 1";
clientIdCmd.Parameters.Add("@" + SyncSession.SyncOriginatorId, SqlDbType.Int).Direction = ParameterDirection.Output;
serverSyncProvider.SelectClientIdCommand = clientIdCmd;
现在的问题是如何从服务器同步到客户端。我认为改变clientSyncProvider会有所帮助，但没有像selectServerIdCommand那样的东西。所以不知道该怎么做。我尝试了很多搜索，但不能很好地适应。