Como filtrar linhas e colunas
Este tópico descreve como filtrar linhas e colunas nas tabelas que são sincronizadas. Os exemplos neste tópico se concentram nos seguintes tipos do Sync Framework:
Para obter informações sobre como executar o código de exemplo, consulte "Exemplo de aplicativos nos tópicos de instruções" em Programando tarefas comuns de sincronização do cliente e do servidor.
Entendendo a filtragem
Frequentemente, o banco de dados do cliente requer apenas um subconjunto dos dados disponíveis no servidor. O Sync Framework permite que você especifique quais linhas e colunas um cliente requer, seja criando comandos de sincronização manualmente ou usando o SqlSyncAdapterBuilder. Com a filtragem de dados, você pode:
Reduzir a quantidade de dados enviada pela rede.
Reduzir a quantidade de espaço de armazenamento exigida no cliente.
Fornecer partições de dados personalizadas com base nas necessidades individuais do cliente.
Evitar ou reduzir conflitos se os clientes estiverem atualizando dados uma vez que partições diferentes de dados podem ser enviadas a clientes diferentes. (Não é possível que dois clientes estejam atualizando os mesmos valores de dados.)
Os filtros podem ser baseados em uma única tabela ou eles podem fazer referência a várias tabelas com as cláusulas JOIN ou várias instruções SELECT. Basear filtros em várias tabelas permite que um usuário baixe uma partição de dados, como um vendedor que precisa somente de dados para seus clientes e todos os pedidos dos clientes. A filtragem em várias tabelas oferece flexibilidade. No entanto, você deve manter os filtros da maneira mais simples possível e testar o desempenho à medida que o número de tabelas aumenta. Você também deve indexar as colunas nas quais os filtros se baseiam.
Importante
Não confie na filtragem de segurança. A capacidade de filtrar dados do servidor com base em uma ID de cliente ou usuário não é um recurso de segurança. Em outras palavras, essa abordagem não pode ser usada para impedir que um cliente leia dados que pertencem a outro cliente. Esse tipo de filtragem é útil apenas para particionar dados e reduzir a quantidade de dados trazida para o banco de dados do cliente.
O Sync Framework não fornece gerenciamento automático de partições. Isso tem as seguintes consequências:
Se você atualizar uma linha e alterar o valor de uma coluna usado na filtragem, a linha não é excluída automaticamente desses clientes cuja partição foi incluída naquela linha. Considere um aplicativo que faz o download de dados cliente com base no código postal para um vendedor. Se um cliente mover seus escritórios para uma nova área de código postal, os dados desse cliente não serão removidos do vendedor que originalmente os possuía. Se essa funcionalidade for necessária, você poderá desenvolver um sistema que permita que o Sync Framework baixe essa atualização como uma exclusão.
Não há mecanismo para impedir que um aplicativo insira dados no cliente que está fora da partição daquele cliente. Você pode adicionar restrições ao cliente para não permitir inserções e atualizações fora da partição.
Filtros baseados em colunas não chave
No controle de alterações do SQL Server e em alguns sistemas de controle personalizados, só é mantida a chave primária das linhas excluídas. Se um filtro é baseado apenas na chave primária, a consulta que você especifica para a propriedade SelectIncrementalDeletesCommand pode identificar o subconjunto correto de colunas e baixá-las no cliente. Se o filtro é baseado em colunas de fora da chave primária, ocorre uma falha na consulta porque ela faz referência a colunas de linhas excluídas que já não existem. Para solucionar esse problema, use uma das seguintes abordagens:
Inclua todas as colunas de filtragem na chave primária. Coloque as colunas adicionais no final da chave para não afetar sua seletividade.
Filtre somente inserções e atualizações. As exclusões supérfluas serão baixadas no cliente, mas serão ignoradas.
Execute exclusões lógicas no servidor. Em vez de excluir a linha, use um gatilho ON DELETE para atualizar uma coluna que marca a linha como excluída ou arquivada. A alteração é enviada para o cliente como atualização.
Sobrecarregue a coluna de contexto no controle de alterações do SQL Server (SYS_CHANGE_CONTEXT) com valores adicionais que podem ser usados para filtrar dados. Provavelmente esta é a melhor opção em termos de desempenho, mas pode ser a mais complexa porque é necessário analisar essa coluna.
Exemplo
O código de exemplo neste tópico mostra como filtrar dados para as tabelas Customer, OrderHeader e OrderDetail do banco de dados de exemplo do Sync Framework. A tabela Customer é filtrada de forma que apenas as linhas com um valor de Brenda Diaz da coluna SalesPerson sejam baixadas. Em seguida, o filtro é estendido para as outras duas tabelas. O exemplo mostra como filtrar dados com o SqlSyncAdapterBuilder e criando os comandos de sincronização manualmente. Para obter uma visão geral dos comandos de sincronização, consulte Como especificar sincronização de instantâneo, de download, de carregamento e bidirecional.
Usando o SqlSyncAdapterBuilder
Esta seção descreve a API usada na filtragem se você criar comandos com o SqlSyncAdapterBuilder. Esta seção fornece exemplos de código que destacam as partes principais da API e fornece um exemplo de código completo.
Partes Principais da API
O exemplo de código a seguir cria um parâmetro de filtro usado na cláusula de filtro para todas as três tabelas.
SqlParameter filterParameter = new SqlParameter("@SalesPerson", SqlDbType.NVarChar);
Dim filterParameter As New SqlParameter("@SalesPerson", SqlDbType.NVarChar)
O exemplo de código a seguir especifica quais colunas devem ser baixadas para a tabela Customer.
string[] customerDataColumns = new string[3];
customerDataColumns[0] = "CustomerId";
customerDataColumns[1] = "CustomerName";
customerDataColumns[2] = "CustomerType";
customerBuilder.DataColumns.AddRange(customerDataColumns);
customerBuilder.TombstoneDataColumns.AddRange(customerDataColumns);
Dim customerDataColumns(2) As String
customerDataColumns(0) = "CustomerId"
customerDataColumns(1) = "CustomerName"
customerDataColumns(2) = "CustomerType"
customerBuilder.DataColumns.AddRange(customerDataColumns)
customerBuilder.TombstoneDataColumns.AddRange(customerDataColumns)
O exemplo de código a seguir especifica quais linhas devem ser baixadas para a tabela Customer. Você pode codificar um valor para SalesPerson. No entanto, é mais comum usar um parâmetro que tenha um valor que possa ser alterado, como mostra o exemplo. O parâmetro do primeiro exemplo de código é usado.
string customerFilterClause = "SalesPerson=@SalesPerson";
customerBuilder.FilterClause = customerFilterClause;
customerBuilder.FilterParameters.Add(filterParameter);
customerBuilder.TombstoneFilterClause = customerFilterClause;
customerBuilder.TombstoneFilterParameters.Add(filterParameter);
Dim customerFilterClause As String = "SalesPerson=@SalesPerson"
With customerBuilder
.FilterClause = customerFilterClause
.FilterParameters.Add(filterParameter)
.TombstoneFilterClause = customerFilterClause
.TombstoneFilterParameters.Add(filterParameter)
End With
O exemplo de código a seguir amplia o filtro da tabela CustomerOrderHeader. Nesse caso, uma instrução SELECT é usada na cláusula de filtro. Para os comandos manuais, uma cláusula JOIN é usada porque oferece mais controle sobre como especificar os comandos.
string orderHeaderFilterClause =
"CustomerId IN (SELECT CustomerId FROM Sales.Customer " +
"WHERE SalesPerson=@SalesPerson)";
orderHeaderBuilder.FilterClause = orderHeaderFilterClause;
orderHeaderBuilder.FilterParameters.Add(filterParameter);
orderHeaderBuilder.TombstoneFilterClause = orderHeaderFilterClause;
orderHeaderBuilder.TombstoneFilterParameters.Add(filterParameter);
Dim orderHeaderFilterClause As String = _
"CustomerId IN (SELECT CustomerId FROM Sales.Customer " _
& "WHERE SalesPerson=@SalesPerson)"
With orderHeaderBuilder
.FilterClause = orderHeaderFilterClause
.FilterParameters.Add(filterParameter)
.TombstoneFilterClause = orderHeaderFilterClause
.TombstoneFilterParameters.Add(filterParameter)
End With
O exemplo de código a seguir especifica um valor para o parâmetro @SalesPerson em uma classe derivada de SyncAgent. Em um aplicativo, esse valor pode ser proveniente de uma ID de logon ou de outra entrada de usuário.
this.Configuration.SyncParameters.Add(
new SyncParameter("@SalesPerson", "Brenda Diaz"));
Me.Configuration.SyncParameters.Add(New SyncParameter("@SalesPerson", "Brenda Diaz"))
Exemplo de código completo
O exemplo de código completo a seguir inclui os exemplos de código descritos anteriormente e o código adicional para executar a sincronização. O exemplo requer a classe Utility disponível em Classe de utilitário para tópicos de instruções do provedor de banco de dados. Quando você executar o exemplo, preste atenção às informações retornadas por SyncStatistics: um subconjunto de linhas é baixado nas sincronizações inicial e posterior.
using System;
using System.IO;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlServerCe;
using Microsoft.Synchronization;
using Microsoft.Synchronization.Data;
using Microsoft.Synchronization.Data.Server;
using Microsoft.Synchronization.Data.SqlServerCe;
namespace Microsoft.Samples.Synchronization
{
class Program
{
static void Main(string[] args)
{
//The SampleStats class handles information from the SyncStatistics
//object that the Synchronize method returns.
SampleStats sampleStats = new SampleStats();
//Request a password for the client database, and delete
//and re-create the database. The client synchronization
//provider also enables you to create the client database
//if it does not exist.
Utility.SetPassword_SqlCeClientSync();
Utility.DeleteAndRecreateCompactDatabase(Utility.ConnStr_SqlCeClientSync, true);
//Initial synchronization. Instantiate the SyncAgent
//and call Synchronize.
SampleSyncAgent sampleSyncAgent = new SampleSyncAgent();
SyncStatistics syncStatistics = sampleSyncAgent.Synchronize();
sampleStats.DisplayStats(syncStatistics, "initial");
//Make changes on the server.
Utility.MakeDataChangesOnServer("Customer");
//Subsequent synchronization.
syncStatistics = sampleSyncAgent.Synchronize();
sampleStats.DisplayStats(syncStatistics, "subsequent");
//Return server data back to its original state.
Utility.CleanUpServer();
//Exit.
Console.Write("\nPress Enter to close the window.");
Console.ReadLine();
}
}
//Create a class that is derived from
//Microsoft.Synchronization.SyncAgent.
public class SampleSyncAgent : SyncAgent
{
public SampleSyncAgent()
{
//Instantiate a client synchronization provider and specify it
//as the local provider for this synchronization agent.
this.LocalProvider = new SampleClientSyncProvider();
//Instantiate a server synchronization provider and specify it
//as the remote provider for this synchronization agent.
this.RemoteProvider = new SampleServerSyncProvider();
//Create two SyncGroups so that changes to OrderHeader
//and OrderDetail are made in one transaction. Depending on
//application requirements, you might include Customer
//in the same group.
SyncGroup customerSyncGroup = new SyncGroup("Customer");
SyncGroup orderSyncGroup = new SyncGroup("Order");
//Add each table: specify a synchronization direction of
//DownloadOnly.
SyncTable customerSyncTable = new SyncTable("Customer");
customerSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
customerSyncTable.SyncDirection = SyncDirection.DownloadOnly;
customerSyncTable.SyncGroup = customerSyncGroup;
this.Configuration.SyncTables.Add(customerSyncTable);
SyncTable orderHeaderSyncTable = new SyncTable("OrderHeader");
orderHeaderSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
orderHeaderSyncTable.SyncDirection = SyncDirection.DownloadOnly;
orderHeaderSyncTable.SyncGroup = orderSyncGroup;
this.Configuration.SyncTables.Add(orderHeaderSyncTable);
SyncTable orderDetailSyncTable = new SyncTable("OrderDetail");
orderDetailSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
orderDetailSyncTable.SyncDirection = SyncDirection.DownloadOnly;
orderDetailSyncTable.SyncGroup = orderSyncGroup;
this.Configuration.SyncTables.Add(orderDetailSyncTable);
//Specify a value for the @SalesPerson parameter that is added
//in the server synchronization provider. This value would
//typically be provided by a user in the application, but we
//have hardcoded it here for convenience.
this.Configuration.SyncParameters.Add(
new SyncParameter("@SalesPerson", "Brenda Diaz"));
}
}
//Create a class that is derived from
//Microsoft.Synchronization.Server.DbServerSyncProvider.
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 command to retrieve a new anchor value from
//the server. In this case, we use a timestamp value
//that is retrieved and stored in the client database.
//During each synchronization, the new anchor value and
//the last anchor value from the previous synchronization
//are used: the set of changes between these upper and
//lower bounds is synchronized.
//
//SyncSession.SyncNewReceivedAnchor is a string constant;
//you could also use @sync_new_received_anchor directly in
//your queries.
SqlCommand selectNewAnchorCommand = new SqlCommand();
string newAnchorVariable = "@" + SyncSession.SyncNewReceivedAnchor;
selectNewAnchorCommand.CommandText = "SELECT " + newAnchorVariable + " = min_active_rowversion() - 1";
selectNewAnchorCommand.Parameters.Add(newAnchorVariable, SqlDbType.Timestamp);
selectNewAnchorCommand.Parameters[newAnchorVariable].Direction = ParameterDirection.Output;
selectNewAnchorCommand.Connection = serverConn;
this.SelectNewAnchorCommand = selectNewAnchorCommand;
//Create a filter parameter that will be used in the filter clause for
//all three tables.
SqlParameter filterParameter = new SqlParameter("@SalesPerson", SqlDbType.NVarChar);
//Create SyncAdapters for each table by using the SqlSyncAdapterBuilder:
// * Specify the base table and tombstone table names.
// * Specify the columns that are used to track when
// changes are made.
// * Specify download-only synchronization.
// * Specify if you want only certain columns at the client.
// * Specify filter clauses for the base tables and tombstone
// tables.
// * Call ToSyncAdapter to create the SyncAdapter.
// * Specify a name for the SyncAdapter that matches the
// the name that is specified for the corresponding SyncTable.
// Do not include the schema names (Sales in this case).
//Customer table.
SqlSyncAdapterBuilder customerBuilder = new SqlSyncAdapterBuilder(serverConn);
customerBuilder.TableName = "Sales.Customer";
customerBuilder.TombstoneTableName = customerBuilder.TableName + "_Tombstone";
customerBuilder.SyncDirection = SyncDirection.DownloadOnly;
customerBuilder.CreationTrackingColumn = "InsertTimestamp";
customerBuilder.UpdateTrackingColumn = "UpdateTimestamp";
customerBuilder.DeletionTrackingColumn = "DeleteTimestamp";
//Specify the columns that you want at the client. If you
//want all columns, this code is not required. In this
//case, we filter out SalesPerson.
string[] customerDataColumns = new string[3];
customerDataColumns[0] = "CustomerId";
customerDataColumns[1] = "CustomerName";
customerDataColumns[2] = "CustomerType";
customerBuilder.DataColumns.AddRange(customerDataColumns);
customerBuilder.TombstoneDataColumns.AddRange(customerDataColumns);
//Specify a filter clause, which is an SQL WHERE clause
//without the WHERE keyword. Use the parameter that is
//created above. The value for the parameter is specified
//in the SyncAgent Configuration object.
string customerFilterClause = "SalesPerson=@SalesPerson";
customerBuilder.FilterClause = customerFilterClause;
customerBuilder.FilterParameters.Add(filterParameter);
customerBuilder.TombstoneFilterClause = customerFilterClause;
customerBuilder.TombstoneFilterParameters.Add(filterParameter);
SyncAdapter customerSyncAdapter = customerBuilder.ToSyncAdapter();
customerSyncAdapter.TableName = "Customer";
this.SyncAdapters.Add(customerSyncAdapter);
//OrderHeader table.
SqlSyncAdapterBuilder orderHeaderBuilder = new SqlSyncAdapterBuilder(serverConn);
orderHeaderBuilder.TableName = "Sales.OrderHeader";
orderHeaderBuilder.TombstoneTableName = orderHeaderBuilder.TableName + "_Tombstone";
orderHeaderBuilder.SyncDirection = SyncDirection.DownloadOnly;
orderHeaderBuilder.CreationTrackingColumn = "InsertTimestamp";
orderHeaderBuilder.UpdateTrackingColumn = "UpdateTimestamp";
orderHeaderBuilder.DeletionTrackingColumn = "DeleteTimestamp";
//Filter properties: extend the filter to the OrderHeader table.
string orderHeaderFilterClause =
"CustomerId IN (SELECT CustomerId FROM Sales.Customer " +
"WHERE SalesPerson=@SalesPerson)";
orderHeaderBuilder.FilterClause = orderHeaderFilterClause;
orderHeaderBuilder.FilterParameters.Add(filterParameter);
orderHeaderBuilder.TombstoneFilterClause = orderHeaderFilterClause;
orderHeaderBuilder.TombstoneFilterParameters.Add(filterParameter);
SyncAdapter orderHeaderSyncAdapter = orderHeaderBuilder.ToSyncAdapter();
orderHeaderSyncAdapter.TableName = "OrderHeader";
this.SyncAdapters.Add(orderHeaderSyncAdapter);
//OrderDetail table.
SqlSyncAdapterBuilder orderDetailBuilder = new SqlSyncAdapterBuilder(serverConn);
orderDetailBuilder.TableName = "Sales.OrderDetail";
orderDetailBuilder.TombstoneTableName = orderDetailBuilder.TableName + "_Tombstone";
orderDetailBuilder.SyncDirection = SyncDirection.DownloadOnly;
orderDetailBuilder.CreationTrackingColumn = "InsertTimestamp";
orderDetailBuilder.UpdateTrackingColumn = "UpdateTimestamp";
orderDetailBuilder.DeletionTrackingColumn = "DeleteTimestamp";
//Filter properties: extend the filter to the OrderDetail table.
string orderDetailFilterClause =
"OrderId IN (SELECT OrderId FROM Sales.OrderHeader " +
"WHERE CustomerId IN " +
"(SELECT CustomerId FROM Sales.Customer " +
"WHERE SalesPerson=@SalesPerson))";
orderDetailBuilder.FilterClause = orderDetailFilterClause;
orderDetailBuilder.FilterParameters.Add(filterParameter);
orderDetailBuilder.TombstoneFilterClause = orderDetailFilterClause;
orderDetailBuilder.TombstoneFilterParameters.Add(filterParameter);
SyncAdapter orderDetailSyncAdapter = orderDetailBuilder.ToSyncAdapter();
orderDetailSyncAdapter.TableName = "OrderDetail";
this.SyncAdapters.Add(orderDetailSyncAdapter);
}
}
//Create a class that is derived from
//Microsoft.Synchronization.Data.SqlServerCe.SqlCeClientSyncProvider.
//You can just instantiate the provider directly and associate it
//with the SyncAgent, but you could use this class to handle client
//provider events and other client-side processing.
public class SampleClientSyncProvider : SqlCeClientSyncProvider
{
public SampleClientSyncProvider()
{
//Specify a connection string for the sample client database.
Utility util = new Utility();
this.ConnectionString = Utility.ConnStr_SqlCeClientSync;
}
}
//Handle the statistics returned by the SyncAgent.
public class SampleStats
{
public void DisplayStats(SyncStatistics syncStatistics, string syncType)
{
Console.WriteLine(String.Empty);
if (syncType == "initial")
{
Console.WriteLine("****** Initial Synchronization ******");
}
else if (syncType == "subsequent")
{
Console.WriteLine("***** Subsequent Synchronization ****");
}
Console.WriteLine("Start Time: " + syncStatistics.SyncStartTime);
Console.WriteLine("Total Changes Downloaded: " + syncStatistics.TotalChangesDownloaded);
Console.WriteLine("Complete Time: " + syncStatistics.SyncCompleteTime);
Console.WriteLine(String.Empty);
}
}
}
Imports System
Imports System.IO
Imports System.Text
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlServerCe
Imports Microsoft.Synchronization
Imports Microsoft.Synchronization.Data
Imports Microsoft.Synchronization.Data.Server
Imports Microsoft.Synchronization.Data.SqlServerCe
Class Program
Shared Sub Main(ByVal args() As String)
'The SampleStats class handles information from the SyncStatistics
'object that the Synchronize method returns.
Dim sampleStats As New SampleStats()
'Request a password for the client database, and delete
'and re-create the database. The client synchronization
'provider also enables you to create the client database
'if it does not exist.
Utility.SetPassword_SqlCeClientSync()
Utility.DeleteAndRecreateCompactDatabase(Utility.ConnStr_SqlCeClientSync, True)
'Initial synchronization. Instantiate the SyncAgent
'and call Synchronize.
Dim sampleSyncAgent As New SampleSyncAgent()
Dim syncStatistics As SyncStatistics = sampleSyncAgent.Synchronize()
sampleStats.DisplayStats(syncStatistics, "initial")
'Make changes on the server.
Utility.MakeDataChangesOnServer("Customer")
'Subsequent synchronization.
syncStatistics = sampleSyncAgent.Synchronize()
sampleStats.DisplayStats(syncStatistics, "subsequent")
'Return server data back to its original state.
Utility.CleanUpServer()
'Exit.
Console.Write(vbLf + "Press Enter to close the window.")
Console.ReadLine()
End Sub 'Main
End Class 'Program
'Create a class that is derived from
'Microsoft.Synchronization.SyncAgent.
Public Class SampleSyncAgent
Inherits SyncAgent
Public Sub New()
'Instantiate a client synchronization provider and specify it
'as the local provider for this synchronization agent.
Me.LocalProvider = New SampleClientSyncProvider()
'Instantiate a server synchronization provider and specify it
'as the remote provider for this synchronization agent.
Me.RemoteProvider = New SampleServerSyncProvider()
'Create two SyncGroups so that changes to OrderHeader
'and OrderDetail are made in one transaction. Depending on
'application requirements, you might include Customer
'in the same group.
Dim customerSyncGroup As New SyncGroup("Customer")
Dim orderSyncGroup As New SyncGroup("Order")
'Add each table: specify a synchronization direction of
'DownloadOnly.
Dim customerSyncTable As New SyncTable("Customer")
customerSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
customerSyncTable.SyncDirection = SyncDirection.DownloadOnly
customerSyncTable.SyncGroup = customerSyncGroup
Me.Configuration.SyncTables.Add(customerSyncTable)
Dim orderHeaderSyncTable As New SyncTable("OrderHeader")
orderHeaderSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
orderHeaderSyncTable.SyncDirection = SyncDirection.DownloadOnly
orderHeaderSyncTable.SyncGroup = orderSyncGroup
Me.Configuration.SyncTables.Add(orderHeaderSyncTable)
Dim orderDetailSyncTable As New SyncTable("OrderDetail")
orderDetailSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
orderDetailSyncTable.SyncDirection = SyncDirection.DownloadOnly
orderDetailSyncTable.SyncGroup = orderSyncGroup
Me.Configuration.SyncTables.Add(orderDetailSyncTable)
'Specify a value for the @SalesPerson parameter that is added
'in the server synchronization provider. This value would
'typically be provided by a user in the application, but we
'have hardcoded it here for convenience.
Me.Configuration.SyncParameters.Add(New SyncParameter("@SalesPerson", "Brenda Diaz"))
End Sub 'New
End Class 'SampleSyncAgent
'Create a class that is derived from
'Microsoft.Synchronization.Server.DbServerSyncProvider.
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 command to retrieve a new anchor value from
'the server. In this case, we use a timestamp value
'that is retrieved and stored in the client database.
'During each synchronization, the new anchor value and
'the last anchor value from the previous synchronization
'are used: the set of changes between these upper and
'lower bounds is synchronized.
'
'SyncSession.SyncNewReceivedAnchor is a string constant;
'you could also use @sync_new_received_anchor directly in
'your queries.
Dim selectNewAnchorCommand As New SqlCommand()
Dim newAnchorVariable As String = "@" + SyncSession.SyncNewReceivedAnchor
With selectNewAnchorCommand
.CommandText = "SELECT " + newAnchorVariable + " = min_active_rowversion() - 1"
.Parameters.Add(newAnchorVariable, SqlDbType.Timestamp)
.Parameters(newAnchorVariable).Direction = ParameterDirection.Output
.Connection = serverConn
End With
Me.SelectNewAnchorCommand = selectNewAnchorCommand
'Create a filter parameter that will be used in the filter clause for
'all three tables.
Dim filterParameter As New SqlParameter("@SalesPerson", SqlDbType.NVarChar)
'Create SyncAdapters for each table by using the SqlSyncAdapterBuilder:
' * Specify the base table and tombstone table names.
' * Specify the columns that are used to track when
' changes are made.
' * Specify download-only synchronization.
' * Specify if you want only certain columns at the client.
' * Specify filter clauses for the base tables and tombstone
' tables.
' * Call ToSyncAdapter to create the SyncAdapter.
' * Specify a name for the SyncAdapter that matches the
' the name that is specified for the corresponding SyncTable.
' Do not include the schema names (Sales in this case).
'Customer table.
Dim customerBuilder As New SqlSyncAdapterBuilder(serverConn)
With customerBuilder
.TableName = "Sales.Customer"
.TombstoneTableName = customerBuilder.TableName + "_Tombstone"
.SyncDirection = SyncDirection.DownloadOnly
.CreationTrackingColumn = "InsertTimestamp"
.UpdateTrackingColumn = "UpdateTimestamp"
.DeletionTrackingColumn = "DeleteTimestamp"
End With
'Specify the columns that you want at the client. If you
'want all columns, this code is not required. In this
'case, we filter out SalesPerson.
Dim customerDataColumns(2) As String
customerDataColumns(0) = "CustomerId"
customerDataColumns(1) = "CustomerName"
customerDataColumns(2) = "CustomerType"
customerBuilder.DataColumns.AddRange(customerDataColumns)
customerBuilder.TombstoneDataColumns.AddRange(customerDataColumns)
'Specify a filter clause, which is an SQL WHERE clause
'without the WHERE keyword. Use the parameter that is
'created above. The value for the parameter is specified
'in the SyncAgent Configuration object.
Dim customerFilterClause As String = "SalesPerson=@SalesPerson"
With customerBuilder
.FilterClause = customerFilterClause
.FilterParameters.Add(filterParameter)
.TombstoneFilterClause = customerFilterClause
.TombstoneFilterParameters.Add(filterParameter)
End With
Dim customerSyncAdapter As SyncAdapter = customerBuilder.ToSyncAdapter()
customerSyncAdapter.TableName = "Customer"
Me.SyncAdapters.Add(customerSyncAdapter)
'OrderHeader table.
Dim orderHeaderBuilder As New SqlSyncAdapterBuilder(serverConn)
With orderHeaderBuilder
.TableName = "Sales.OrderHeader"
.TombstoneTableName = orderHeaderBuilder.TableName + "_Tombstone"
.SyncDirection = SyncDirection.DownloadOnly
.CreationTrackingColumn = "InsertTimestamp"
.UpdateTrackingColumn = "UpdateTimestamp"
.DeletionTrackingColumn = "DeleteTimestamp"
End With
'Filter properties: extend the filter to the OrderHeader table.
Dim orderHeaderFilterClause As String = _
"CustomerId IN (SELECT CustomerId FROM Sales.Customer " _
& "WHERE SalesPerson=@SalesPerson)"
With orderHeaderBuilder
.FilterClause = orderHeaderFilterClause
.FilterParameters.Add(filterParameter)
.TombstoneFilterClause = orderHeaderFilterClause
.TombstoneFilterParameters.Add(filterParameter)
End With
Dim orderHeaderSyncAdapter As SyncAdapter = orderHeaderBuilder.ToSyncAdapter()
orderHeaderSyncAdapter.TableName = "OrderHeader"
Me.SyncAdapters.Add(orderHeaderSyncAdapter)
'OrderDetail table.
Dim orderDetailBuilder As New SqlSyncAdapterBuilder(serverConn)
With orderDetailBuilder
.TableName = "Sales.OrderDetail"
.TombstoneTableName = orderDetailBuilder.TableName + "_Tombstone"
.SyncDirection = SyncDirection.DownloadOnly
.CreationTrackingColumn = "InsertTimestamp"
.UpdateTrackingColumn = "UpdateTimestamp"
.DeletionTrackingColumn = "DeleteTimestamp"
'Filter properties: extend the filter to the OrderDetail table.
Dim orderDetailFilterClause As String = _
"OrderId IN (SELECT OrderId FROM Sales.OrderHeader " _
& "WHERE CustomerId IN " _
& "(SELECT CustomerId FROM Sales.Customer " _
& "WHERE SalesPerson=@SalesPerson))"
.FilterClause = orderDetailFilterClause
.FilterParameters.Add(filterParameter)
.TombstoneFilterClause = orderDetailFilterClause
.TombstoneFilterParameters.Add(filterParameter)
End With
Dim orderDetailSyncAdapter As SyncAdapter = orderDetailBuilder.ToSyncAdapter()
orderDetailSyncAdapter.TableName = "OrderDetail"
Me.SyncAdapters.Add(orderDetailSyncAdapter)
End Sub 'New
End Class 'SampleServerSyncProvider
'Create a class that is derived from
'Microsoft.Synchronization.Data.SqlServerCe.SqlCeClientSyncProvider.
'You can just instantiate the provider directly and associate it
'with the SyncAgent, but you could use this class to handle client
'provider events and other client-side processing.
Public Class SampleClientSyncProvider
Inherits SqlCeClientSyncProvider
Public Sub New()
'Specify a connection string for the sample client database.
Dim util As New Utility()
Me.ConnectionString = Utility.ConnStr_SqlCeClientSync
End Sub 'New
End Class 'SampleClientSyncProvider
'Handle the statistics returned by the SyncAgent.
Public Class SampleStats
Public Sub DisplayStats(ByVal syncStatistics As SyncStatistics, ByVal syncType As String)
Console.WriteLine(String.Empty)
If syncType = "initial" Then
Console.WriteLine("****** Initial Synchronization ******")
ElseIf syncType = "subsequent" Then
Console.WriteLine("***** Subsequent Synchronization ****")
End If
Console.WriteLine("Start Time: " & syncStatistics.SyncStartTime)
Console.WriteLine("Total Changes Downloaded: " & syncStatistics.TotalChangesDownloaded)
Console.WriteLine("Complete Time: " & syncStatistics.SyncCompleteTime)
Console.WriteLine(String.Empty)
End Sub 'DisplayStats
End Class 'SampleStats
Usando os comandos manuais
Esta seção descreve a API usada na filtragem se você criar os comandos usando manualmente. Esta seção fornece exemplos de código que destacam as partes principais da API e fornece um exemplo de código completo.
Partes Principais da API
O exemplo de código a seguir especifica quais colunas e linhas inseridas devem ser baixadas para a tabela Customer. Você pode codificar um valor para SalesPerson. No entanto, é mais comum usar um parâmetro que tenha um valor que possa ser alterado, como mostra o exemplo. O exemplo passa o parâmetro de filtragem junto com os outros parâmetros necessários para baixar inserções incrementais.
SqlCommand customerIncrInserts = new SqlCommand();
customerIncrInserts.CommandText =
"SELECT CustomerId, CustomerName, CustomerType " +
"FROM Sales.Customer " +
"WHERE SalesPerson = @SalesPerson " +
"AND (InsertTimestamp > @sync_last_received_anchor " +
"AND InsertTimestamp <= @sync_new_received_anchor " +
"AND InsertId <> @sync_client_id)";
customerIncrInserts.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
customerIncrInserts.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
customerIncrInserts.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
customerIncrInserts.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
customerIncrInserts.Connection = serverConn;
customerSyncAdapter.SelectIncrementalInsertsCommand = customerIncrInserts;
Dim customerIncrInserts As New SqlCommand()
With customerIncrInserts
.CommandText = _
"SELECT CustomerId, CustomerName, CustomerType " _
& "FROM Sales.Customer " _
& "WHERE SalesPerson = @SalesPerson " _
& "AND (InsertTimestamp > @sync_last_received_anchor " _
& "AND InsertTimestamp <= @sync_new_received_anchor " _
& "AND InsertId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
customerSyncAdapter.SelectIncrementalInsertsCommand = customerIncrInserts
O exemplo de código a seguir amplia o filtro da tabela CustomerOrderHeader. Nesse caso, uma cláusula JOIN é usada para definir a relação entre as duas tabelas.
SqlCommand orderHeaderIncrInserts = new SqlCommand();
orderHeaderIncrInserts.CommandText =
"SELECT oh.OrderId, oh.CustomerId, oh.OrderDate, oh.OrderStatus " +
"FROM Sales.OrderHeader oh " +
"JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " +
"WHERE c.SalesPerson = @SalesPerson " +
"AND (oh.InsertTimestamp > @sync_last_received_anchor " +
"AND oh.InsertTimestamp <= @sync_new_received_anchor " +
"AND oh.InsertId <> @sync_client_id)";
orderHeaderIncrInserts.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
orderHeaderIncrInserts.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrInserts.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrInserts.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
orderHeaderIncrInserts.Connection = serverConn;
orderHeaderSyncAdapter.SelectIncrementalInsertsCommand = orderHeaderIncrInserts;
Dim orderHeaderIncrInserts As New SqlCommand()
With orderHeaderIncrInserts
.CommandText = _
"SELECT oh.OrderId, oh.CustomerId, oh.OrderDate, oh.OrderStatus " _
& "FROM Sales.OrderHeader oh " _
& "JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " _
& "WHERE c.SalesPerson = @SalesPerson " _
& "AND (oh.InsertTimestamp > @sync_last_received_anchor " _
& "AND oh.InsertTimestamp <= @sync_new_received_anchor " _
& "AND oh.InsertId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
orderHeaderSyncAdapter.SelectIncrementalInsertsCommand = orderHeaderIncrInserts
O exemplo de código a seguir especifica um valor para o parâmetro @SalesPerson em uma classe derivada de SyncAgent. Em um aplicativo, esse valor pode ser proveniente de uma ID de logon ou de outra entrada de usuário.
this.Configuration.SyncParameters.Add(
new SyncParameter("@SalesPerson", "Brenda Diaz"));
this.Configuration.SyncParameters.Add(
new SyncParameter("@SalesPerson", "Brenda Diaz"));
Exemplo de código completo
O exemplo de código completo a seguir inclui os exemplos de código descritos anteriormente e o código adicional para executar a sincronização. O exemplo requer a classe Utility disponível em Classe de utilitário para tópicos de instruções do provedor de banco de dados. Quando você executar o exemplo, preste atenção às informações retornadas por SyncStatistics: um subconjunto de linhas é baixado nas sincronizações inicial e posterior.
using System;
using System.IO;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlServerCe;
using Microsoft.Synchronization;
using Microsoft.Synchronization.Data;
using Microsoft.Synchronization.Data.Server;
using Microsoft.Synchronization.Data.SqlServerCe;
namespace Microsoft.Samples.Synchronization
{
class Program
{
static void Main(string[] args)
{
//The SampleStats class handles information from the SyncStatistics
//object that the Synchronize method returns.
SampleStats sampleStats = new SampleStats();
//Request a password for the client database, and delete
//and recreate the database. The client synchronization
//provider also enables you to create the client database
//if it does not exist.
Utility.SetPassword_SqlCeClientSync();
Utility.DeleteAndRecreateCompactDatabase(Utility.ConnStr_SqlCeClientSync, true);
//Initial synchronization. Instantiate the SyncAgent
//and call Synchronize.
SampleSyncAgent sampleSyncAgent = new SampleSyncAgent();
SyncStatistics syncStatistics = sampleSyncAgent.Synchronize();
sampleStats.DisplayStats(syncStatistics, "initial");
//Make changes on the server.
Utility.MakeDataChangesOnServer("Customer");
//Subsequent synchronization.
syncStatistics = sampleSyncAgent.Synchronize();
sampleStats.DisplayStats(syncStatistics, "subsequent");
//Return server data back to its original state.
Utility.CleanUpServer();
//Exit.
Console.Write("\nPress Enter to close the window.");
Console.ReadLine();
}
}
//Create a class that is derived from
//Microsoft.Synchronization.SyncAgent
public class SampleSyncAgent : SyncAgent
{
public SampleSyncAgent()
{
//Instantiate a client synchronization provider and specify it
//as the local provider for this synchronization agent.
this.LocalProvider = new SampleClientSyncProvider();
//Instantiate a server synchronization provider and specify it
//as the remote provider for this synchronization agent.
this.RemoteProvider = new SampleServerSyncProvider();
//Create two SyncGroups, so that changes to OrderHeader
//and OrderDetail are made in one transaction. Depending on
//application requirements, you might include Customer
//in the same group.
SyncGroup customerSyncGroup = new SyncGroup("Customer");
SyncGroup orderSyncGroup = new SyncGroup("Order");
//Add each table: specify a synchronization direction of
//DownloadOnly.
SyncTable customerSyncTable = new SyncTable("Customer");
customerSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
customerSyncTable.SyncDirection = SyncDirection.DownloadOnly;
customerSyncTable.SyncGroup = customerSyncGroup;
this.Configuration.SyncTables.Add(customerSyncTable);
SyncTable orderHeaderSyncTable = new SyncTable("OrderHeader");
orderHeaderSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
orderHeaderSyncTable.SyncDirection = SyncDirection.DownloadOnly;
orderHeaderSyncTable.SyncGroup = orderSyncGroup;
this.Configuration.SyncTables.Add(orderHeaderSyncTable);
SyncTable orderDetailSyncTable = new SyncTable("OrderDetail");
orderDetailSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
orderDetailSyncTable.SyncDirection = SyncDirection.DownloadOnly;
orderDetailSyncTable.SyncGroup = orderSyncGroup;
this.Configuration.SyncTables.Add(orderDetailSyncTable);
//Specify a value for the @SalesPerson parameter that is added
//in the server synchronization provider. This value would
//typically be provided by a user in the application, but we
//have hardcoded it here for convenience.
this.Configuration.SyncParameters.Add(
new SyncParameter("@SalesPerson", "Brenda Diaz"));
}
}
//Create a class that is derived from
//Microsoft.Synchronization.Server.DbServerSyncProvider
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 command to retrieve a new anchor value from
//the server. In this case, we use a timestamp value
//that is retrieved and stored in the client database.
//During each synchronization, the new anchor value and
//the last anchor value from the previous synchronization
//are used: the set of changes between these upper and
//lower bounds is synchronized.
//
//SyncSession.SyncNewReceivedAnchor is a string constant;
//you could also use @sync_new_received_anchor directly in
//your queries.
SqlCommand selectNewAnchorCommand = new SqlCommand();
string newAnchorVariable = "@" + SyncSession.SyncNewReceivedAnchor;
selectNewAnchorCommand.CommandText = "SELECT " + newAnchorVariable + " = min_active_rowversion() - 1";
selectNewAnchorCommand.Parameters.Add(newAnchorVariable, SqlDbType.Timestamp);
selectNewAnchorCommand.Parameters[newAnchorVariable].Direction = ParameterDirection.Output;
selectNewAnchorCommand.Connection = serverConn;
this.SelectNewAnchorCommand = selectNewAnchorCommand;
//Create a SyncAdapter for each table, and then define
//the commands to synchronize changes:
//* SelectIncrementalInsertsCommand, SelectIncrementalUpdatesCommand,
// and SelectIncrementalDeletesCommand are used to select changes
// from the server that the client provider then applies to the client.
//* Specify if you want only certain columns at the client by
// using the SELECT statement in the command.
//* Filter rows by using the WHERE clause in the command.
// In this case, we filter out SalesPerson.
//
//Customer table
//
//Create the SyncAdapter
SyncAdapter customerSyncAdapter = new SyncAdapter("Customer");
//Select inserts from the server
SqlCommand customerIncrInserts = new SqlCommand();
customerIncrInserts.CommandText =
"SELECT CustomerId, CustomerName, CustomerType " +
"FROM Sales.Customer " +
"WHERE SalesPerson = @SalesPerson " +
"AND (InsertTimestamp > @sync_last_received_anchor " +
"AND InsertTimestamp <= @sync_new_received_anchor " +
"AND InsertId <> @sync_client_id)";
customerIncrInserts.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
customerIncrInserts.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
customerIncrInserts.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
customerIncrInserts.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
customerIncrInserts.Connection = serverConn;
customerSyncAdapter.SelectIncrementalInsertsCommand = customerIncrInserts;
//Select updates from the server
SqlCommand customerIncrUpdates = new SqlCommand();
customerIncrUpdates.CommandText =
"SELECT CustomerId, CustomerName, CustomerType " +
"FROM Sales.Customer " +
"WHERE SalesPerson = @SalesPerson " +
"AND (UpdateTimestamp > @sync_last_received_anchor " +
"AND UpdateTimestamp <= @sync_new_received_anchor " +
"AND UpdateId <> @sync_client_id " +
"AND NOT (InsertTimestamp > @sync_last_received_anchor " +
"AND InsertId <> @sync_client_id))";
customerIncrUpdates.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
customerIncrUpdates.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
customerIncrUpdates.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
customerIncrUpdates.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
customerIncrUpdates.Connection = serverConn;
customerSyncAdapter.SelectIncrementalUpdatesCommand = customerIncrUpdates;
//Select deletes from the server
SqlCommand customerIncrDeletes = new SqlCommand();
customerIncrDeletes.CommandText =
"SELECT CustomerId, CustomerName, CustomerType " +
"FROM Sales.Customer_Tombstone " +
"WHERE SalesPerson = @SalesPerson " +
"AND (@sync_initialized = 1 " +
"AND DeleteTimestamp > @sync_last_received_anchor " +
"AND DeleteTimestamp <= @sync_new_received_anchor " +
"AND DeleteId <> @sync_client_id)";
customerIncrDeletes.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
customerIncrDeletes.Parameters.Add("@" + SyncSession.SyncInitialized, SqlDbType.Bit);
customerIncrDeletes.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
customerIncrDeletes.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
customerIncrDeletes.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
customerIncrDeletes.Connection = serverConn;
customerSyncAdapter.SelectIncrementalDeletesCommand = customerIncrDeletes;
//Add the SyncAdapter to the server synchronization provider
this.SyncAdapters.Add(customerSyncAdapter);
//
//OrderHeader table
//
//Create the SyncAdapter
SyncAdapter orderHeaderSyncAdapter = new SyncAdapter("OrderHeader");
//Select inserts from the server
SqlCommand orderHeaderIncrInserts = new SqlCommand();
orderHeaderIncrInserts.CommandText =
"SELECT oh.OrderId, oh.CustomerId, oh.OrderDate, oh.OrderStatus " +
"FROM Sales.OrderHeader oh " +
"JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " +
"WHERE c.SalesPerson = @SalesPerson " +
"AND (oh.InsertTimestamp > @sync_last_received_anchor " +
"AND oh.InsertTimestamp <= @sync_new_received_anchor " +
"AND oh.InsertId <> @sync_client_id)";
orderHeaderIncrInserts.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
orderHeaderIncrInserts.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrInserts.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrInserts.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
orderHeaderIncrInserts.Connection = serverConn;
orderHeaderSyncAdapter.SelectIncrementalInsertsCommand = orderHeaderIncrInserts;
//Select updates from the server
SqlCommand orderHeaderIncrUpdates = new SqlCommand();
orderHeaderIncrUpdates.CommandText =
"SELECT oh.OrderId, oh.CustomerId, oh.OrderDate, oh.OrderStatus " +
"FROM Sales.OrderHeader oh " +
"JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " +
"WHERE c.SalesPerson = @SalesPerson " +
"AND (oh.UpdateTimestamp > @sync_last_received_anchor " +
"AND oh.UpdateTimestamp <= @sync_new_received_anchor " +
"AND oh.UpdateId <> @sync_client_id " +
"AND NOT (oh.InsertTimestamp > @sync_last_received_anchor " +
"AND oh.InsertId <> @sync_client_id))";
orderHeaderIncrUpdates.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
orderHeaderIncrUpdates.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrUpdates.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrUpdates.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
orderHeaderIncrUpdates.Connection = serverConn;
orderHeaderSyncAdapter.SelectIncrementalUpdatesCommand = orderHeaderIncrUpdates;
//Select deletes from the server
SqlCommand orderHeaderIncrDeletes = new SqlCommand();
orderHeaderIncrDeletes.CommandText =
"SELECT oht.OrderId, oht.CustomerId, oht.OrderDate, oht.OrderStatus " +
"FROM Sales.OrderHeader_Tombstone oht " +
"JOIN Sales.Customer c ON oht.CustomerId = c.CustomerId " +
"WHERE c.SalesPerson = @SalesPerson " +
"AND (@sync_initialized = 1 " +
"AND oht.DeleteTimestamp > @sync_last_received_anchor " +
"AND oht.DeleteTimestamp <= @sync_new_received_anchor " +
"AND oht.DeleteId <> @sync_client_id)";
orderHeaderIncrDeletes.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
orderHeaderIncrDeletes.Parameters.Add("@" + SyncSession.SyncInitialized, SqlDbType.Bit);
orderHeaderIncrDeletes.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrDeletes.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
orderHeaderIncrDeletes.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
orderHeaderIncrDeletes.Connection = serverConn;
orderHeaderSyncAdapter.SelectIncrementalDeletesCommand = orderHeaderIncrDeletes;
//Add the SyncAdapter to the server synchronization provider
this.SyncAdapters.Add(orderHeaderSyncAdapter);
//
//OrderDetail table
//
//Create the SyncAdapter
SyncAdapter orderDetailSyncAdapter = new SyncAdapter("OrderDetail");
//Select inserts from the server
SqlCommand orderDetailIncrInserts = new SqlCommand();
orderDetailIncrInserts.CommandText =
"SELECT od.OrderDetailId, od.OrderId, od.Product, od.Quantity " +
"FROM Sales.OrderDetail od " +
"JOIN Sales.OrderHeader oh ON od.OrderId = oh.OrderId " +
"JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " +
"WHERE SalesPerson = @SalesPerson " +
"AND (od.InsertTimestamp > @sync_last_received_anchor " +
"AND od.InsertTimestamp <= @sync_new_received_anchor " +
"AND od.InsertId <> @sync_client_id)";
orderDetailIncrInserts.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
orderDetailIncrInserts.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
orderDetailIncrInserts.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
orderDetailIncrInserts.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
orderDetailIncrInserts.Connection = serverConn;
orderDetailSyncAdapter.SelectIncrementalInsertsCommand = orderDetailIncrInserts;
//Select updates from the server
SqlCommand orderDetailIncrUpdates = new SqlCommand();
orderDetailIncrUpdates.CommandText =
"SELECT od.OrderDetailId, od.OrderId, od.Product, od.Quantity " +
"FROM Sales.OrderDetail od " +
"JOIN Sales.OrderHeader oh ON od.OrderId = oh.OrderId " +
"JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " +
"WHERE SalesPerson = @SalesPerson " +
"AND (od.UpdateTimestamp > @sync_last_received_anchor " +
"AND od.UpdateTimestamp <= @sync_new_received_anchor " +
"AND od.UpdateId <> @sync_client_id " +
"AND NOT (od.InsertTimestamp > @sync_last_received_anchor " +
"AND od.InsertId <> @sync_client_id))";
orderDetailIncrUpdates.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
orderDetailIncrUpdates.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
orderDetailIncrUpdates.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
orderDetailIncrUpdates.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
orderDetailIncrUpdates.Connection = serverConn;
orderDetailSyncAdapter.SelectIncrementalUpdatesCommand = orderDetailIncrUpdates;
//Select deletes from the server
SqlCommand orderDetailIncrDeletes = new SqlCommand();
orderDetailIncrDeletes.CommandText =
"SELECT odt.OrderDetailId, odt.OrderId, odt.Product, odt.Quantity " +
"FROM Sales.OrderDetail_Tombstone odt " +
"JOIN Sales.OrderHeader oh ON odt.OrderId = oh.OrderId " +
"JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " +
"WHERE SalesPerson = @SalesPerson " +
"AND (@sync_initialized = 1 " +
"AND odt.DeleteTimestamp > @sync_last_received_anchor " +
"AND odt.DeleteTimestamp <= @sync_new_received_anchor " +
"AND odt.DeleteId <> @sync_client_id)";
orderDetailIncrDeletes.Parameters.Add("@SalesPerson", SqlDbType.NVarChar);
orderDetailIncrDeletes.Parameters.Add("@" + SyncSession.SyncInitialized, SqlDbType.Bit);
orderDetailIncrDeletes.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp);
orderDetailIncrDeletes.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp);
orderDetailIncrDeletes.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier);
orderDetailIncrDeletes.Connection = serverConn;
orderDetailSyncAdapter.SelectIncrementalDeletesCommand = orderDetailIncrDeletes;
//Add the SyncAdapter to the server synchronization provider
this.SyncAdapters.Add(orderDetailSyncAdapter);
}
}
//Create a class that is derived from
//Microsoft.Synchronization.Data.SqlServerCe.SqlCeClientSyncProvider.
//You can just instantiate the provider directly and associate it
//with the SyncAgent, but you could use this class to handle client
//provider events and other client-side processing.
public class SampleClientSyncProvider : SqlCeClientSyncProvider
{
public SampleClientSyncProvider()
{
//Specify a connection string for the sample client database.
Utility util = new Utility();
this.ConnectionString = Utility.ConnStr_SqlCeClientSync;
}
}
//Handle the statistics returned by the SyncAgent.
public class SampleStats
{
public void DisplayStats(SyncStatistics syncStatistics, string syncType)
{
Console.WriteLine(String.Empty);
if (syncType == "initial")
{
Console.WriteLine("****** Initial Synchronization ******");
}
else if (syncType == "subsequent")
{
Console.WriteLine("***** Subsequent Synchronization ****");
}
Console.WriteLine("Start Time: " + syncStatistics.SyncStartTime);
Console.WriteLine("Total Changes Downloaded: " + syncStatistics.TotalChangesDownloaded);
Console.WriteLine("Complete Time: " + syncStatistics.SyncCompleteTime);
Console.WriteLine(String.Empty);
}
}
}
Imports System
Imports System.IO
Imports System.Text
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlServerCe
Imports Microsoft.Synchronization
Imports Microsoft.Synchronization.Data
Imports Microsoft.Synchronization.Data.Server
Imports Microsoft.Synchronization.Data.SqlServerCe
Class Program
Shared Sub Main(ByVal args() As String)
'The SampleStats class handles information from the SyncStatistics
'object that the Synchronize method returns.
Dim sampleStats As New SampleStats()
'Request a password for the client database, and delete
'and re-create the database. The client synchronization
'provider also enables you to create the client database
'if it does not exist.
Utility.SetPassword_SqlCeClientSync()
Utility.DeleteAndRecreateCompactDatabase(Utility.ConnStr_SqlCeClientSync, True)
'Initial synchronization. Instantiate the SyncAgent
'and call Synchronize.
Dim sampleSyncAgent As New SampleSyncAgent()
Dim syncStatistics As SyncStatistics = sampleSyncAgent.Synchronize()
sampleStats.DisplayStats(syncStatistics, "initial")
'Make changes on the server.
Utility.MakeDataChangesOnServer("Customer")
'Subsequent synchronization.
syncStatistics = sampleSyncAgent.Synchronize()
sampleStats.DisplayStats(syncStatistics, "subsequent")
'Return server data back to its original state.
Utility.CleanUpServer()
'Exit.
Console.Write(vbLf + "Press Enter to close the window.")
Console.ReadLine()
End Sub 'Main
End Class 'Program
'Create a class that is derived from
'Microsoft.Synchronization.SyncAgent.
Public Class SampleSyncAgent
Inherits SyncAgent
Public Sub New()
'Instantiate a client synchronization provider and specify it
'as the local provider for this synchronization agent.
Me.LocalProvider = New SampleClientSyncProvider()
'Instantiate a server synchronization provider and specify it
'as the remote provider for this synchronization agent.
Me.RemoteProvider = New SampleServerSyncProvider()
'Create two SyncGroups so that changes to OrderHeader
'and OrderDetail are made in one transaction. Depending on
'application requirements, you might include Customer
'in the same group.
Dim customerSyncGroup As New SyncGroup("Customer")
Dim orderSyncGroup As New SyncGroup("Order")
'Add each table: specify a synchronization direction of
'DownloadOnly.
Dim customerSyncTable As New SyncTable("Customer")
customerSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
customerSyncTable.SyncDirection = SyncDirection.DownloadOnly
customerSyncTable.SyncGroup = customerSyncGroup
Me.Configuration.SyncTables.Add(customerSyncTable)
Dim orderHeaderSyncTable As New SyncTable("OrderHeader")
orderHeaderSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
orderHeaderSyncTable.SyncDirection = SyncDirection.DownloadOnly
orderHeaderSyncTable.SyncGroup = orderSyncGroup
Me.Configuration.SyncTables.Add(orderHeaderSyncTable)
Dim orderDetailSyncTable As New SyncTable("OrderDetail")
orderDetailSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
orderDetailSyncTable.SyncDirection = SyncDirection.DownloadOnly
orderDetailSyncTable.SyncGroup = orderSyncGroup
Me.Configuration.SyncTables.Add(orderDetailSyncTable)
'Specify a value for the @SalesPerson parameter that is added
'in the server synchronization provider. This value would
'typically be provided by a user in the application, but we
'have hardcoded it here for convenience.
Me.Configuration.SyncParameters.Add(New SyncParameter("@SalesPerson", "Brenda Diaz"))
End Sub 'New
End Class 'SampleSyncAgent
'Create a class that is derived from
'Microsoft.Synchronization.Server.DbServerSyncProvider.
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 command to retrieve a new anchor value from
'the server. In this case, we use a timestamp value
'that is retrieved and stored in the client database.
'During each synchronization, the new anchor value and
'the last anchor value from the previous synchronization
'are used: the set of changes between these upper and
'lower bounds is synchronized.
'
'SyncSession.SyncNewReceivedAnchor is a string constant;
'you could also use @sync_new_received_anchor directly in
'your queries.
Dim selectNewAnchorCommand As New SqlCommand()
Dim newAnchorVariable As String = "@" + SyncSession.SyncNewReceivedAnchor
With selectNewAnchorCommand
.CommandText = "SELECT " + newAnchorVariable + " = min_active_rowversion() - 1"
.Parameters.Add(newAnchorVariable, SqlDbType.Timestamp)
.Parameters(newAnchorVariable).Direction = ParameterDirection.Output
.Connection = serverConn
End With
Me.SelectNewAnchorCommand = selectNewAnchorCommand
'Create a SyncAdapter for each table, and then define
'the commands to synchronize changes:
'* SelectIncrementalInsertsCommand, SelectIncrementalUpdatesCommand,
' and SelectIncrementalDeletesCommand are used to select changes
' from the server that the client provider then applies to the client.
'* Specify if you want only certain columns at the client by
' using the SELECT statement in the command.
'* Filter rows by using the WHERE clause in the command.
' In this case, we filter out SalesPerson.
'
'Customer table.
'
'Create the SyncAdapter.
Dim customerSyncAdapter As New SyncAdapter("Customer")
'Select inserts from the server.
Dim customerIncrInserts As New SqlCommand()
With customerIncrInserts
.CommandText = _
"SELECT CustomerId, CustomerName, CustomerType " _
& "FROM Sales.Customer " _
& "WHERE SalesPerson = @SalesPerson " _
& "AND (InsertTimestamp > @sync_last_received_anchor " _
& "AND InsertTimestamp <= @sync_new_received_anchor " _
& "AND InsertId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
customerSyncAdapter.SelectIncrementalInsertsCommand = customerIncrInserts
'Select updates from the server.
Dim customerIncrUpdates As New SqlCommand()
With customerIncrUpdates
.CommandText = _
"SELECT CustomerId, CustomerName, CustomerType " _
& "FROM Sales.Customer " _
& "WHERE SalesPerson = @SalesPerson " _
& "AND (UpdateTimestamp > @sync_last_received_anchor " _
& "AND UpdateTimestamp <= @sync_new_received_anchor " _
& "AND UpdateId <> @sync_client_id " _
& "AND NOT (InsertTimestamp > @sync_last_received_anchor " _
& "AND InsertId <> @sync_client_id))"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
customerSyncAdapter.SelectIncrementalUpdatesCommand = customerIncrUpdates
'Select deletes from the server.
Dim customerIncrDeletes As New SqlCommand()
With customerIncrDeletes
.CommandText = _
"SELECT CustomerId, CustomerName, CustomerType " _
& "FROM Sales.Customer_Tombstone " _
& "WHERE SalesPerson = @SalesPerson " _
& "AND (@sync_initialized = 1 " _
& "AND DeleteTimestamp > @sync_last_received_anchor " _
& "AND DeleteTimestamp <= @sync_new_received_anchor " _
& "AND DeleteId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncInitialized, SqlDbType.Bit)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
customerSyncAdapter.SelectIncrementalDeletesCommand = customerIncrDeletes
'Add the SyncAdapter to the server synchronization provider.
Me.SyncAdapters.Add(customerSyncAdapter)
'
'OrderHeader table.
'
'Create the SyncAdapter.
Dim orderHeaderSyncAdapter As New SyncAdapter("OrderHeader")
'Select inserts from the server.
Dim orderHeaderIncrInserts As New SqlCommand()
With orderHeaderIncrInserts
.CommandText = _
"SELECT oh.OrderId, oh.CustomerId, oh.OrderDate, oh.OrderStatus " _
& "FROM Sales.OrderHeader oh " _
& "JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " _
& "WHERE c.SalesPerson = @SalesPerson " _
& "AND (oh.InsertTimestamp > @sync_last_received_anchor " _
& "AND oh.InsertTimestamp <= @sync_new_received_anchor " _
& "AND oh.InsertId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
orderHeaderSyncAdapter.SelectIncrementalInsertsCommand = orderHeaderIncrInserts
'Select updates from the server.
Dim orderHeaderIncrUpdates As New SqlCommand()
With orderHeaderIncrUpdates
.CommandText = _
"SELECT oh.OrderId, oh.CustomerId, oh.OrderDate, oh.OrderStatus " _
& "FROM Sales.OrderHeader oh " _
& "JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " _
& "WHERE c.SalesPerson = @SalesPerson " _
& "AND (oh.UpdateTimestamp > @sync_last_received_anchor " _
& "AND oh.UpdateTimestamp <= @sync_new_received_anchor " _
& "AND oh.UpdateId <> @sync_client_id " _
& "AND NOT (oh.InsertTimestamp > @sync_last_received_anchor " _
& "AND oh.InsertId <> @sync_client_id))"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
orderHeaderSyncAdapter.SelectIncrementalUpdatesCommand = orderHeaderIncrUpdates
'Select deletes from the server.
Dim orderHeaderIncrDeletes As New SqlCommand()
With orderHeaderIncrDeletes
.CommandText = _
"SELECT oht.OrderId, oht.CustomerId, oht.OrderDate, oht.OrderStatus " _
& "FROM Sales.OrderHeader_Tombstone oht " _
& "JOIN Sales.Customer c ON oht.CustomerId = c.CustomerId " _
& "WHERE c.SalesPerson = @SalesPerson " _
& "AND (@sync_initialized = 1 " _
& "AND oht.DeleteTimestamp > @sync_last_received_anchor " _
& "AND oht.DeleteTimestamp <= @sync_new_received_anchor " _
& "AND oht.DeleteId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncInitialized, SqlDbType.Bit)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
orderHeaderSyncAdapter.SelectIncrementalDeletesCommand = orderHeaderIncrDeletes
'Add the SyncAdapter to the server synchronization provider.
Me.SyncAdapters.Add(orderHeaderSyncAdapter)
'
'OrderDetail table.
'
'Create the SyncAdapter.
Dim orderDetailSyncAdapter As New SyncAdapter("OrderDetail")
'Select inserts from the server.
Dim orderDetailIncrInserts As New SqlCommand()
With orderDetailIncrInserts
.CommandText = _
"SELECT od.OrderDetailId, od.OrderId, od.Product, od.Quantity " _
& "FROM Sales.OrderDetail od " _
& "JOIN Sales.OrderHeader oh ON od.OrderId = oh.OrderId " _
& "JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " _
& "WHERE SalesPerson = @SalesPerson " _
& "AND (od.InsertTimestamp > @sync_last_received_anchor " _
& "AND od.InsertTimestamp <= @sync_new_received_anchor " _
& "AND od.InsertId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
orderDetailSyncAdapter.SelectIncrementalInsertsCommand = orderDetailIncrInserts
'Select updates from the server.
Dim orderDetailIncrUpdates As New SqlCommand()
With orderDetailIncrUpdates
.CommandText = _
"SELECT od.OrderDetailId, od.OrderId, od.Product, od.Quantity " _
& "FROM Sales.OrderDetail od " _
& "JOIN Sales.OrderHeader oh ON od.OrderId = oh.OrderId " _
& "JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " _
& "WHERE SalesPerson = @SalesPerson " _
& "AND (od.UpdateTimestamp > @sync_last_received_anchor " _
& "AND od.UpdateTimestamp <= @sync_new_received_anchor " _
& "AND od.UpdateId <> @sync_client_id " _
& "AND NOT (od.InsertTimestamp > @sync_last_received_anchor " _
& "AND od.InsertId <> @sync_client_id))"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
orderDetailSyncAdapter.SelectIncrementalUpdatesCommand = orderDetailIncrUpdates
'Select deletes from the server.
Dim orderDetailIncrDeletes As New SqlCommand()
With orderDetailIncrDeletes
.CommandText = _
"SELECT odt.OrderDetailId, odt.OrderId, odt.Product, odt.Quantity " _
& "FROM Sales.OrderDetail_Tombstone odt " _
& "JOIN Sales.OrderHeader oh ON odt.OrderId = oh.OrderId " _
& "JOIN Sales.Customer c ON oh.CustomerId = c.CustomerId " _
& "WHERE SalesPerson = @SalesPerson " _
& "AND (@sync_initialized = 1 " _
& "AND odt.DeleteTimestamp > @sync_last_received_anchor " _
& "AND odt.DeleteTimestamp <= @sync_new_received_anchor " _
& "AND odt.DeleteId <> @sync_client_id)"
.Parameters.Add("@SalesPerson", SqlDbType.NVarChar)
.Parameters.Add("@" + SyncSession.SyncInitialized, SqlDbType.Bit)
.Parameters.Add("@" + SyncSession.SyncLastReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncNewReceivedAnchor, SqlDbType.Timestamp)
.Parameters.Add("@" + SyncSession.SyncClientId, SqlDbType.UniqueIdentifier)
.Connection = serverConn
End With
orderDetailSyncAdapter.SelectIncrementalDeletesCommand = orderDetailIncrDeletes
'Add the SyncAdapter to the server synchronization provider.
Me.SyncAdapters.Add(orderDetailSyncAdapter)
End Sub 'New
End Class 'SampleServerSyncProvider
'Create a class that is derived from
'Microsoft.Synchronization.Data.SqlServerCe.SqlCeClientSyncProvider.
'You can just instantiate the provider directly and associate it
'with the SyncAgent, but you could use this class to handle client
'provider events and other client-side processing.
Public Class SampleClientSyncProvider
Inherits SqlCeClientSyncProvider
Public Sub New()
'Specify a connection string for the sample client database.
Dim util As New Utility()
Me.ConnectionString = Utility.ConnStr_SqlCeClientSync
End Sub 'New
End Class 'SampleClientSyncProvider
'Handle the statistics that are returned by the SyncAgent.
Public Class SampleStats
Public Sub DisplayStats(ByVal syncStatistics As SyncStatistics, ByVal syncType As String)
Console.WriteLine(String.Empty)
If syncType = "initial" Then
Console.WriteLine("****** Initial Synchronization ******")
ElseIf syncType = "subsequent" Then
Console.WriteLine("***** Subsequent Synchronization ****")
End If
Console.WriteLine("Start Time: " & syncStatistics.SyncStartTime)
Console.WriteLine("Total Changes Downloaded: " & syncStatistics.TotalChangesDownloaded)
Console.WriteLine("Complete Time: " & syncStatistics.SyncCompleteTime)
Console.WriteLine(String.Empty)
End Sub 'DisplayStats
End Class 'SampleStats
Consulte também
Outros recursos
Programando tarefas comuns de sincronização do cliente e do servidor