Trabajar con eventos y programar la lógica empresarial
En este tema se describe cómo se puede trabajar con los eventos y la lógica empresarial de Sync Framework. Los ejemplos de este tema se centran en los tipos y eventos siguientes de Sync Framework:
Eventos SyncAgent StateChanged y SessionStateChangedEventArgs
Los eventos SyncAgent SessionProgress y SessionProgressEventArgs
Eventos DbServerSyncProvider ApplyingChanges, SqlCeClientSyncProvider ApplyingChanges y ApplyingChangesEventArgs
Eventos SqlCeClientSyncProvider SchemaCreated y SchemaCreatedEventArgs
Eventos DbServerSyncProvider ChangesSelected y SqlCeClientSyncProvider ChangesSelected, y ChangesSelectedEventArgs
Eventos DbServerSyncProvider ChangesApplied y SqlCeClientSyncProvider ChangesApplied, y ChangesAppliedEventArgs
Eventos DbServerSyncProvider ApplyChangeFailed y SqlCeClientSyncProvider ApplyChangeFailed, y ApplyChangeFailedEventArgs
Para obtener información sobre la ejecución del código de ejemplo, vea "Aplicaciones de ejemplo en los temas de procedimientos" en Programar tareas comunes de sincronización de cliente y servidor.
Introducción a los eventos de proveedores de bases de datos
Sync Framework proporciona multitud de eventos que exponen datos y metadatos, y que pueden usarse durante la sincronización. Por ejemplo, el objeto SchemaCreatedEventArgs proporciona acceso al objeto SyncSchema para cada tabla creada en la base de datos cliente, así como la conexión y transacción sobre las cuales se creó el esquema. Esto permite efectuar cambios en el esquema por medio de la API, dentro de la misma transacción que el proveedor de sincronización del cliente.
La hora a la que se genera el evento es pertinente a su utilización, como puede verse en los ejemplos siguientes:
El evento SchemaCreated se inicia una vez creada cada tabla. Esto es útil si se tiene que cambiar un esquema en una tabla antes de crear otra tabla.
Los eventos DbServerSyncProvider ApplyingChanges y SqlCeClientSyncProvider ApplyingChanges se generan antes de que se apliquen los cambios a cada grupo de sincronización. Esto permite ver los metadatos y el conjunto de cambios de un grupo de tablas relacionadas antes de que se apliquen los cambios.
Los eventos DbServerSyncProvider ApplyChangeFailed y SqlCeClientSyncProvider ApplyChangeFailed se generan después de cada error de aplicación de una fila. Esto podría deberse a un error o un conflicto de datos. Estos eventos permiten dar una respuesta a cada error antes de continuar con el procesamiento. Esto podría disminuir el número de reintentos cuando se producen errores en los cambios.
Ejemplo
El código de ejemplo de este tema muestra cómo puede responder a los eventos Sync Framework mostrando el progreso de la sincronización en la pantalla, registrando los datos relacionados con los eventos para los cambios aplicados y con error, y cambiando los datos durante la sincronización para aplicar la lógica empresarial. En vez de dividir este ejemplo en ejemplos de código, le resultará más útil ejecutar el código de ejemplo y ver qué datos se muestran en la pantalla y se registran para cada evento para las clases EventLogger y SampleStatsAndProgress. No obstante, antes de ejecutar el código de ejemplo, se recomienda examinar el siguiente ejemplo de código.
Aplicar la lógica empresarial durante la sincronización
Este ejemplo muestra el control sobre los datos del que se dispone durante la sincronización. Muestra cómo puede tener acceso al conjunto de cambios antes de que se aplique en el servidor, mediante el control del evento ApplyingChanges del servidor. El ejemplo también muestra cómo puede introducir la lógica para el evento del cliente. En este caso, se actualiza una columna. No obstante, le resultaría muy fácil realizar una comprobación de inventario o aplicar cualquier otra lógica empresarial que requiera una aplicación, antes de que se confirmen los cambios en el servidor o el cliente. Para obtener ejemplos en los que se muestra cómo hacer esto cuando se produzcan conflictos de datos, vea Controlar conflictos de datos y errores.
private void SampleServerSyncProvider_ApplyingChanges(object sender, ApplyingChangesEventArgs e)
{
DataTable customerDataTable = e.Changes.Tables["Customer"];
for (int i = 0; i < customerDataTable.Rows.Count; i++)
{
if (customerDataTable.Rows[i].RowState == DataRowState.Added
&& customerDataTable.Rows[i]["CustomerType"] == "Wholesale")
{
customerDataTable.Rows[i]["CustomerType"] = "Wholesale (from mobile sales)";
}
}
}
Private Sub SampleServerSyncProvider_ApplyingChanges(ByVal sender As Object, ByVal e As ApplyingChangesEventArgs)
Dim customerDataTable As DataTable = e.Changes.Tables("Customer")
Dim i As Integer
For i = 1 To customerDataTable.Rows.Count - 1
If customerDataTable.Rows(i).RowState = DataRowState.Added _
AndAlso customerDataTable.Rows(i)("CustomerType") = "Wholesale" Then
customerDataTable.Rows(i)("CustomerType") = "Wholesale (from mobile sales)"
End If
Next i
End Sub
Ejemplo de código completo
El ejemplo de código completo siguiente requiere que esté disponible la clase Utility en Clase de utilidad para los temas de procedimientos del proveedor de bases de datos.
using System;
using System.Collections;
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 SampleStatsAndProgress class handles information from the
//SyncStatistics object that the Synchronize method returns and
//from SyncAgent events.
SampleStatsAndProgress sampleStats = new SampleStatsAndProgress();
//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 and client.
Utility.MakeDataChangesOnServer("Customer");
Utility.MakeDataChangesOnClient("Customer");
//Subsequent synchronization.
syncStatistics = sampleSyncAgent.Synchronize();
sampleStats.DisplayStats(syncStatistics, "subsequent");
//Make a change at the client that fails when it is
//applied at the server.
Utility.MakeFailingChangeOnClient();
//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
//Bidirectional.
SyncTable customerSyncTable = new SyncTable("Customer");
customerSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
customerSyncTable.SyncDirection = SyncDirection.Bidirectional;
customerSyncTable.SyncGroup = customerSyncGroup;
this.Configuration.SyncTables.Add(customerSyncTable);
SyncTable orderHeaderSyncTable = new SyncTable("OrderHeader");
orderHeaderSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
orderHeaderSyncTable.SyncDirection = SyncDirection.Bidirectional;
orderHeaderSyncTable.SyncGroup = orderSyncGroup;
this.Configuration.SyncTables.Add(orderHeaderSyncTable);
SyncTable orderDetailSyncTable = new SyncTable("OrderDetail");
orderDetailSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable;
orderDetailSyncTable.SyncDirection = SyncDirection.Bidirectional;
orderDetailSyncTable.SyncGroup = orderSyncGroup;
this.Configuration.SyncTables.Add(orderDetailSyncTable);
//Handle the StateChanged and SessionProgress events, and
//display information to the console.
SampleStatsAndProgress sampleStats = new SampleStatsAndProgress();
this.StateChanged += new EventHandler<SessionStateChangedEventArgs>(sampleStats.DisplaySessionProgress);
this.SessionProgress += new EventHandler<SessionProgressEventArgs>(sampleStats.DisplaySessionProgress);
}
}
//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 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
// and where changes are made.
// * Specify bidirectional synchronization.
// * Call ToSyncAdapter to create the SyncAdapter.
// * Specify a name for the SyncAdapter that matches the
// the name 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.Bidirectional;
customerBuilder.CreationTrackingColumn = "InsertTimestamp";
customerBuilder.UpdateTrackingColumn = "UpdateTimestamp";
customerBuilder.DeletionTrackingColumn = "DeleteTimestamp";
customerBuilder.CreationOriginatorIdColumn = "InsertId";
customerBuilder.UpdateOriginatorIdColumn = "UpdateId";
customerBuilder.DeletionOriginatorIdColumn = "DeleteId";
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.Bidirectional;
orderHeaderBuilder.CreationTrackingColumn = "InsertTimestamp";
orderHeaderBuilder.UpdateTrackingColumn = "UpdateTimestamp";
orderHeaderBuilder.DeletionTrackingColumn = "DeleteTimestamp";
orderHeaderBuilder.CreationOriginatorIdColumn = "InsertId";
orderHeaderBuilder.UpdateOriginatorIdColumn = "UpdateId";
orderHeaderBuilder.DeletionOriginatorIdColumn = "DeleteId";
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.Bidirectional;
orderDetailBuilder.CreationTrackingColumn = "InsertTimestamp";
orderDetailBuilder.UpdateTrackingColumn = "UpdateTimestamp";
orderDetailBuilder.DeletionTrackingColumn = "DeleteTimestamp";
orderDetailBuilder.CreationOriginatorIdColumn = "InsertId";
orderDetailBuilder.UpdateOriginatorIdColumn = "UpdateId";
orderDetailBuilder.DeletionOriginatorIdColumn = "DeleteId";
SyncAdapter orderDetailSyncAdapter = orderDetailBuilder.ToSyncAdapter();
orderDetailSyncAdapter.TableName = "OrderDetail";
this.SyncAdapters.Add(orderDetailSyncAdapter);
//Log information for the following events.
this.ChangesSelected += new EventHandler<ChangesSelectedEventArgs>(EventLogger.LogEvents);
this.ChangesApplied += new EventHandler<ChangesAppliedEventArgs>(EventLogger.LogEvents);
this.ApplyChangeFailed += new EventHandler<ApplyChangeFailedEventArgs>(EventLogger.LogEvents);
//Handle the ApplyingChanges event so that we can
//make changes to the dataset.
this.ApplyingChanges += new EventHandler<ApplyingChangesEventArgs>(SampleServerSyncProvider_ApplyingChanges);
}
//Look for inserted rows in the dataset that have a CustomerType
//of Wholesale and update these rows. With access to the dataset,
//you can write any business logic that your application requires.
private void SampleServerSyncProvider_ApplyingChanges(object sender, ApplyingChangesEventArgs e)
{
DataTable customerDataTable = e.Changes.Tables["Customer"];
for (int i = 0; i < customerDataTable.Rows.Count; i++)
{
if (customerDataTable.Rows[i].RowState == DataRowState.Added
&& customerDataTable.Rows[i]["CustomerType"] == "Wholesale")
{
customerDataTable.Rows[i]["CustomerType"] = "Wholesale (from mobile sales)";
}
}
}
}
//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 here we use this class to handle client
//provider events.
public class SampleClientSyncProvider : SqlCeClientSyncProvider
{
public SampleClientSyncProvider()
{
//Specify a connection string for the sample client database.
Utility util = new Utility();
this.ConnectionString = Utility.ConnStr_SqlCeClientSync;
//Log information for the following events.
this.SchemaCreated += new EventHandler<SchemaCreatedEventArgs>(EventLogger.LogEvents);
this.ChangesSelected += new EventHandler<ChangesSelectedEventArgs>(EventLogger.LogEvents);
this.ChangesApplied += new EventHandler<ChangesAppliedEventArgs>(EventLogger.LogEvents);
this.ApplyChangeFailed += new EventHandler<ApplyChangeFailedEventArgs>(EventLogger.LogEvents);
//Use the following events to fix up schema on the client.
//We use the CreatingSchema event to change the schema
//by using the API. We use the SchemaCreated event
//to change the schema by using SQL.
//Note that both schema events fire for the Customer table,
//even though we already created the table. This allows us
//to work with the table at this point if we have to.
this.CreatingSchema += new EventHandler<CreatingSchemaEventArgs>(SampleClientSyncProvider_CreatingSchema);
this.SchemaCreated += new EventHandler<SchemaCreatedEventArgs>(SampleClientSyncProvider_SchemaCreated);
}
private void SampleClientSyncProvider_CreatingSchema(object sender, CreatingSchemaEventArgs e)
{
string tableName = e.Table.TableName;
if (tableName == "Customer")
{
//Set the RowGuid property because it is not copied
//to the client by default. This is also a good time
//to specify literal defaults with .Columns[ColName].DefaultValue,
//but we will specify defaults like NEWID() by calling
//ALTER TABLE after the table is created.
e.Schema.Tables["Customer"].Columns["CustomerId"].RowGuid = true;
}
if (tableName == "OrderHeader")
{
e.Schema.Tables["OrderHeader"].Columns["OrderId"].RowGuid = true;
}
}
private void SampleClientSyncProvider_SchemaCreated(object sender, SchemaCreatedEventArgs e)
{
string tableName = e.Table.TableName;
Utility util = new Utility();
//Call ALTER TABLE on the client. This must be done
//over the same connection and within the same
//transaction that Sync Framework uses
//to create the schema on the client.
if (tableName == "Customer")
{
Utility.MakeSchemaChangesOnClient(e.Connection, e.Transaction, "Customer");
}
if (tableName == "OrderHeader")
{
Utility.MakeSchemaChangesOnClient(e.Connection, e.Transaction, "OrderHeader");
}
if (tableName == "OrderDetail")
{
Utility.MakeSchemaChangesOnClient(e.Connection, e.Transaction, "OrderDetail");
}
}
}
//Handle SyncAgent events and the statistics that are returned by the SyncAgent.
public class SampleStatsAndProgress
{
public void DisplayStats(SyncStatistics syncStatistics, string syncType)
{
Console.WriteLine(String.Empty);
if (syncType == "initial")
{
Console.WriteLine("****** Initial Synchronization Stats ******");
}
else if (syncType == "subsequent")
{
Console.WriteLine("***** Subsequent Synchronization Stats ****");
}
Console.WriteLine("Start Time: " + syncStatistics.SyncStartTime);
Console.WriteLine("Upload Changes Applied: " + syncStatistics.UploadChangesApplied);
Console.WriteLine("Upload Changes Failed: " + syncStatistics.UploadChangesFailed);
Console.WriteLine("Total Changes Uploaded: " + syncStatistics.TotalChangesUploaded);
Console.WriteLine("Download Changes Applied: " + syncStatistics.DownloadChangesApplied);
Console.WriteLine("Download Changes Failed: " + syncStatistics.DownloadChangesFailed);
Console.WriteLine("Total Changes Downloaded: " + syncStatistics.TotalChangesDownloaded);
Console.WriteLine("Complete Time: " + syncStatistics.SyncCompleteTime);
Console.WriteLine(String.Empty);
}
public void DisplaySessionProgress(object sender, EventArgs e)
{
StringBuilder outputText = new StringBuilder();
if (e is SessionStateChangedEventArgs)
{
SessionStateChangedEventArgs args = (SessionStateChangedEventArgs)e;
if (args.SessionState == SyncSessionState.Synchronizing)
{
outputText.AppendLine(String.Empty);
outputText.Append("** SyncAgent is synchronizing");
}
else
{
outputText.Append("** SyncAgent is ready to synchronize");
}
}
else if (e is SessionProgressEventArgs)
{
SessionProgressEventArgs args = (SessionProgressEventArgs)e;
outputText.Append("Percent complete: " + args.PercentCompleted + " (" + args.SyncStage + ")");
}
else
{
outputText.AppendLine("Unknown event occurred");
}
Console.WriteLine(outputText.ToString());
}
}
public class EventLogger
{
//Create client and server log files, and write to them
//based on data from several EventArgs classes.
public static void LogEvents(object sender, EventArgs e)
{
string logFile = String.Empty;
string site = String.Empty;
if (sender is SampleServerSyncProvider)
{
logFile = "ServerLogFile.txt";
site = "server";
}
else if (sender is SampleClientSyncProvider)
{
logFile = "ClientLogFile.txt";
site = "client";
}
StreamWriter streamWriter = File.AppendText(logFile);
StringBuilder outputText = new StringBuilder();
if (e is ChangesSelectedEventArgs)
{
ChangesSelectedEventArgs args = (ChangesSelectedEventArgs)e;
outputText.AppendLine("Client ID: " + args.Session.ClientId);
outputText.AppendLine("Changes selected from " + site + " for group " + args.GroupMetadata.GroupName);
outputText.AppendLine("Inserts selected from " + site + " for group: " + args.Context.GroupProgress.TotalInserts.ToString());
outputText.AppendLine("Updates selected from " + site + " for group: " + args.Context.GroupProgress.TotalUpdates.ToString());
outputText.AppendLine("Deletes selected from " + site + " for group: " + args.Context.GroupProgress.TotalDeletes.ToString());
}
else if (e is ChangesAppliedEventArgs)
{
ChangesAppliedEventArgs args = (ChangesAppliedEventArgs)e;
outputText.AppendLine("Client ID: " + args.Session.ClientId);
outputText.AppendLine("Changes applied to " + site + " for group " + args.GroupMetadata.GroupName);
outputText.AppendLine("Inserts applied to " + site + " for group: " + args.Context.GroupProgress.TotalInserts.ToString());
outputText.AppendLine("Updates applied to " + site + " for group: " + args.Context.GroupProgress.TotalUpdates.ToString());
outputText.AppendLine("Deletes applied to " + site + " for group: " + args.Context.GroupProgress.TotalDeletes.ToString());
}
else if (e is SchemaCreatedEventArgs)
{
SchemaCreatedEventArgs args = (SchemaCreatedEventArgs)e;
outputText.AppendLine("Schema creation for group: " + args.Table.SyncGroup.GroupName);
outputText.AppendLine("Table: " + args.Table.TableName);
outputText.AppendLine("Direction : " + args.Table.SyncDirection);
outputText.AppendLine("Creation Option: " + args.Table.CreationOption);
}
else if (e is ApplyChangeFailedEventArgs)
{
ApplyChangeFailedEventArgs args = (ApplyChangeFailedEventArgs)e;
outputText.AppendLine("** APPLY CHANGE FAILURE AT " + site.ToUpper() + " **");
outputText.AppendLine("Table for which failure occurred: " + args.TableMetadata.TableName);
outputText.AppendLine("Error message: " + args.Error.Message);
}
else
{
outputText.AppendLine("Unknown event occurred");
}
streamWriter.WriteLine(DateTime.Now.ToShortTimeString() + " | " + outputText.ToString());
streamWriter.Flush();
streamWriter.Dispose();
}
}
}
Imports System
Imports System.Collections
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 SampleStatsAndProgress class handles information from the
'SyncStatistics object that the Synchronize method returns and
'from SyncAgent events.
Dim sampleStats As New SampleStatsAndProgress()
'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 and client.
Utility.MakeDataChangesOnServer("Customer")
Utility.MakeDataChangesOnClient("Customer")
'Subsequent synchronization.
syncStatistics = sampleSyncAgent.Synchronize()
sampleStats.DisplayStats(syncStatistics, "subsequent")
'Make a change at the client that fails when it is
'applied at the server.
Utility.MakeFailingChangeOnClient()
'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
'Bidirectional.
Dim customerSyncTable As New SyncTable("Customer")
customerSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
customerSyncTable.SyncDirection = SyncDirection.Bidirectional
customerSyncTable.SyncGroup = customerSyncGroup
Me.Configuration.SyncTables.Add(customerSyncTable)
Dim orderHeaderSyncTable As New SyncTable("OrderHeader")
orderHeaderSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
orderHeaderSyncTable.SyncDirection = SyncDirection.Bidirectional
orderHeaderSyncTable.SyncGroup = orderSyncGroup
Me.Configuration.SyncTables.Add(orderHeaderSyncTable)
Dim orderDetailSyncTable As New SyncTable("OrderDetail")
orderDetailSyncTable.CreationOption = TableCreationOption.DropExistingOrCreateNewTable
orderDetailSyncTable.SyncDirection = SyncDirection.Bidirectional
orderDetailSyncTable.SyncGroup = orderSyncGroup
Me.Configuration.SyncTables.Add(orderDetailSyncTable)
'Handle the StateChanged and SessionProgress events, and
'display information to the console.
Dim sampleStats As New SampleStatsAndProgress()
AddHandler Me.StateChanged, AddressOf sampleStats.DisplaySessionProgress
AddHandler Me.SessionProgress, AddressOf sampleStats.DisplaySessionProgress
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 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
' and where changes are made.
' * Specify bidirectional synchronization.
' * Call ToSyncAdapter to create the SyncAdapter.
' * Specify a name for the SyncAdapter that matches the
' the name 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.Bidirectional
.CreationTrackingColumn = "InsertTimestamp"
.UpdateTrackingColumn = "UpdateTimestamp"
.DeletionTrackingColumn = "DeleteTimestamp"
.CreationOriginatorIdColumn = "InsertId"
.UpdateOriginatorIdColumn = "UpdateId"
.DeletionOriginatorIdColumn = "DeleteId"
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.Bidirectional
.CreationTrackingColumn = "InsertTimestamp"
.UpdateTrackingColumn = "UpdateTimestamp"
.DeletionTrackingColumn = "DeleteTimestamp"
.CreationOriginatorIdColumn = "InsertId"
.UpdateOriginatorIdColumn = "UpdateId"
.DeletionOriginatorIdColumn = "DeleteId"
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.Bidirectional
.CreationTrackingColumn = "InsertTimestamp"
.UpdateTrackingColumn = "UpdateTimestamp"
.DeletionTrackingColumn = "DeleteTimestamp"
.CreationOriginatorIdColumn = "InsertId"
.UpdateOriginatorIdColumn = "UpdateId"
.DeletionOriginatorIdColumn = "DeleteId"
End With
Dim orderDetailSyncAdapter As SyncAdapter = orderDetailBuilder.ToSyncAdapter()
orderDetailSyncAdapter.TableName = "OrderDetail"
Me.SyncAdapters.Add(orderDetailSyncAdapter)
'Log information for the following events.
AddHandler Me.ChangesSelected, AddressOf EventLogger.LogEvents
AddHandler Me.ChangesApplied, AddressOf EventLogger.LogEvents
AddHandler Me.ApplyChangeFailed, AddressOf EventLogger.LogEvents
'Handle the ApplyingChanges event so that we can
'make changes to the dataset.
AddHandler Me.ApplyingChanges, AddressOf SampleServerSyncProvider_ApplyingChanges
End Sub 'New
'Look for inserted rows in the dataset that have a CustomerType
'of Wholesale and update these rows. With access to the dataset,
'you can write any business logic that your application requires.
Private Sub SampleServerSyncProvider_ApplyingChanges(ByVal sender As Object, ByVal e As ApplyingChangesEventArgs)
Dim customerDataTable As DataTable = e.Changes.Tables("Customer")
Dim i As Integer
For i = 1 To customerDataTable.Rows.Count - 1
If customerDataTable.Rows(i).RowState = DataRowState.Added _
AndAlso customerDataTable.Rows(i)("CustomerType") = "Wholesale" Then
customerDataTable.Rows(i)("CustomerType") = "Wholesale (from mobile sales)"
End If
Next i
End Sub
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 here we use this class to handle client
'provider events.
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
'Log information for the following events.
AddHandler Me.SchemaCreated, AddressOf EventLogger.LogEvents
AddHandler Me.ChangesSelected, AddressOf EventLogger.LogEvents
AddHandler Me.ChangesApplied, AddressOf EventLogger.LogEvents
AddHandler Me.ApplyChangeFailed, AddressOf EventLogger.LogEvents
'Use the following events to fix up schema on the client.
'We use the CreatingSchema event to change the schema
'by using the API. We use the SchemaCreated event
'to change the schema by using SQL.
'Note that both schema events fire for the Customer table,
'even though we already created the table. This allows us
'to work with the table at this point if we have to.
AddHandler Me.CreatingSchema, AddressOf SampleClientSyncProvider_CreatingSchema
AddHandler Me.SchemaCreated, AddressOf SampleClientSyncProvider_SchemaCreated
End Sub 'New
Private Sub SampleClientSyncProvider_CreatingSchema(ByVal sender As Object, ByVal e As CreatingSchemaEventArgs)
Dim tableName As String = e.Table.TableName
If tableName = "Customer" Then
'Set the RowGuid property because it is not copied
'to the client by default. This is also a good time
'to specify literal defaults with .Columns[ColName].DefaultValue,
'but we will specify defaults like NEWID() by calling
'ALTER TABLE after the table is created.
e.Schema.Tables("Customer").Columns("CustomerId").RowGuid = True
End If
If tableName = "OrderHeader" Then
e.Schema.Tables("OrderHeader").Columns("OrderId").RowGuid = True
End If
End Sub 'SampleClientSyncProvider_CreatingSchema
Private Sub SampleClientSyncProvider_SchemaCreated(ByVal sender As Object, ByVal e As SchemaCreatedEventArgs)
Dim tableName As String = e.Table.TableName
Dim util As New Utility()
'Call ALTER TABLE on the client. This must be done
'over the same connection and within the same
'transaction that Sync Framework uses
'to create the schema on the client.
If tableName = "Customer" Then
Utility.MakeSchemaChangesOnClient(e.Connection, e.Transaction, "Customer")
End If
If tableName = "OrderHeader" Then
Utility.MakeSchemaChangesOnClient(e.Connection, e.Transaction, "OrderHeader")
End If
If tableName = "OrderDetail" Then
Utility.MakeSchemaChangesOnClient(e.Connection, e.Transaction, "OrderDetail")
End If
End Sub 'SampleClientSyncProvider_SchemaCreated
End Class 'SampleClientSyncProvider
'Handle SyncAgent events and the statistics that are returned by the SyncAgent.
Public Class SampleStatsAndProgress
Public Sub DisplayStats(ByVal syncStatistics As SyncStatistics, ByVal syncType As String)
Console.WriteLine(String.Empty)
If syncType = "initial" Then
Console.WriteLine("****** Initial Synchronization Stats ******")
ElseIf syncType = "subsequent" Then
Console.WriteLine("***** Subsequent Synchronization Stats ****")
End If
Console.WriteLine("Start Time: " & syncStatistics.SyncStartTime)
Console.WriteLine("Upload Changes Applied: " & syncStatistics.UploadChangesApplied)
Console.WriteLine("Upload Changes Failed: " & syncStatistics.UploadChangesFailed)
Console.WriteLine("Total Changes Uploaded: " & syncStatistics.TotalChangesUploaded)
Console.WriteLine("Download Changes Applied: " & syncStatistics.DownloadChangesApplied)
Console.WriteLine("Download Changes Failed: " & syncStatistics.DownloadChangesFailed)
Console.WriteLine("Total Changes Downloaded: " & syncStatistics.TotalChangesDownloaded)
Console.WriteLine("Complete Time: " & syncStatistics.SyncCompleteTime)
Console.WriteLine(String.Empty)
End Sub 'DisplayStats
Public Sub DisplaySessionProgress(ByVal sender As Object, ByVal e As EventArgs)
Dim outputText As New StringBuilder()
If TypeOf e Is SessionStateChangedEventArgs Then
Dim args As SessionStateChangedEventArgs = CType(e, SessionStateChangedEventArgs)
If args.SessionState = SyncSessionState.Synchronizing Then
outputText.AppendLine(String.Empty)
outputText.Append("** SyncAgent is synchronizing")
Else
outputText.Append("** SyncAgent is ready to synchronize")
End If
ElseIf TypeOf e Is SessionProgressEventArgs Then
Dim args As SessionProgressEventArgs = CType(e, SessionProgressEventArgs)
outputText.Append("Percent complete: " & args.PercentCompleted & " (" & args.SyncStage.ToString() & ")")
Else
outputText.AppendLine("Unknown event occurred")
End If
Console.WriteLine(outputText.ToString())
End Sub 'DisplaySessionProgress
End Class 'SampleStatsAndProgress
Public Class EventLogger
'Create client and server log files, and write to them
'based on data from several EventArgs classes.
Public Shared Sub LogEvents(ByVal sender As Object, ByVal e As EventArgs)
Dim logFile As String = String.Empty
Dim site As String = String.Empty
If TypeOf sender Is SampleServerSyncProvider Then
logFile = "ServerLogFile.txt"
site = "server"
ElseIf TypeOf sender Is SampleClientSyncProvider Then
logFile = "ClientLogFile.txt"
site = "client"
End If
Dim streamWriter As StreamWriter = File.AppendText(logFile)
Dim outputText As New StringBuilder()
If TypeOf e Is ChangesSelectedEventArgs Then
Dim args As ChangesSelectedEventArgs = CType(e, ChangesSelectedEventArgs)
outputText.AppendLine("Client ID: " & args.Session.ClientId.ToString())
outputText.AppendLine("Changes selected from " & site & " for group " & args.GroupMetadata.GroupName)
outputText.AppendLine("Inserts selected from " & site & " for group: " & args.Context.GroupProgress.TotalInserts.ToString())
outputText.AppendLine("Updates selected from " & site & " for group: " & args.Context.GroupProgress.TotalUpdates.ToString())
outputText.AppendLine("Deletes selected from " & site & " for group: " & args.Context.GroupProgress.TotalDeletes.ToString())
ElseIf TypeOf e Is ChangesAppliedEventArgs Then
Dim args As ChangesAppliedEventArgs = CType(e, ChangesAppliedEventArgs)
outputText.AppendLine("Client ID: " & args.Session.ClientId.ToString())
outputText.AppendLine("Changes applied to " & site & " for group " & args.GroupMetadata.GroupName)
outputText.AppendLine("Inserts applied to " & site & " for group: " & args.Context.GroupProgress.TotalInserts.ToString())
outputText.AppendLine("Updates applied to " & site & " for group: " & args.Context.GroupProgress.TotalUpdates.ToString())
outputText.AppendLine("Deletes applied to " & site & " for group: " & args.Context.GroupProgress.TotalDeletes.ToString())
ElseIf TypeOf e Is SchemaCreatedEventArgs Then
Dim args As SchemaCreatedEventArgs = CType(e, SchemaCreatedEventArgs)
outputText.AppendLine("Schema creation for group: " & args.Table.SyncGroup.GroupName)
outputText.AppendLine("Table: " & args.Table.TableName)
outputText.AppendLine("Direction : " & args.Table.SyncDirection)
outputText.AppendLine("Creation Option: " & args.Table.CreationOption)
ElseIf TypeOf e Is ApplyChangeFailedEventArgs Then
Dim args As ApplyChangeFailedEventArgs = CType(e, ApplyChangeFailedEventArgs)
outputText.AppendLine("** APPLY CHANGE FAILURE AT " & site.ToUpper() & " **")
outputText.AppendLine("Table for which failure occurred: " & args.TableMetadata.TableName)
outputText.AppendLine("Error message: " & args.Error.Message)
Else
outputText.AppendLine("Unknown event occurred")
End If
streamWriter.WriteLine(DateTime.Now.ToShortTimeString() + " | " + outputText.ToString())
streamWriter.Flush()
streamWriter.Dispose()
End Sub 'LogEvents
End Class 'EventLogger
Vea también
Conceptos
Programar tareas comunes de sincronización de cliente y servidor