Como sincronizar uma assinatura push (Programação RMO)
É possível sincronizar as assinaturas push programaticamente usando o RMO (Replication Management Objects) e o acesso de código gerenciado para as funcionalidades do agente de replicação. As classes usadas para sincronizar uma assinatura push dependem do tipo de publicação ao qual a assinatura pertence.
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Se quiser iniciar uma sincronização que executa de forma autônoma sem afetar seu aplicativo, inicie o agente em modo assíncrono. Porém, se quiser monitorar o resultado da sincronização e receber retornos de chamada do agente durante o processo de sincronização (por exemplo, se quiser exibir a barra de andamento), inicie o agente de forma síncrona. Para os Assinantes da MicrosoftSQL Server 2005 Express Edition, você deve iniciar o agente de forma síncrona. |
Para sincronizar uma assinatura push a um instantâneo ou publicação transacional
Crie uma conexão com o Distribuidor usando a classe ServerConnection.
Crie uma instância da classe TransSubscription e defina as propriedades a seguir:
O nome do banco de dados de publicação para DatabaseName.
O nome da publicação à qual a assinatura pertence para PublicationName.
O nome do banco de dados de assinatura para SubscriptionDBName.
O nome do Assinante para SubscriberName.
A conexão criada na etapa 1 para ConnectionContext.
Chame o método LoadProperties para obter as demais propriedades da assinatura. Se este método retornar false, verifique se a assinatura existe.
Inicie o Distribution Agent no Distribuidor de uma das seguintes maneiras:
Chame o método SynchronizeWithJob na instância de TransSubscription da etapa 2. Este método inicia o Distribution Agent de forma assíncrona e o controle retorna imediatamente para o seu aplicativo com o trabalho do agente em execução. Você não poderá chamar este método se a assinatura foi criada com um valor de false para CreateSyncAgentByDefault.
Obtenha uma instância de classe TransSynchronizationAgent da propriedade SynchronizationAgent e chame o método Synchronize. Este método inicia o agente de forma síncrona e o controle permanece com o trabalho do agente em execução. Durante a execução síncrona você pode manipular o evento Status com o agente em execução.
Para sincronizar uma assinatura push a uma publicação de mesclagem
Crie uma conexão com o Distribuidor usando a classe ServerConnection.
Crie uma instância de classe MergeSubscription e defina as propriedades a seguir:
O nome do banco de dados de publicação para DatabaseName.
O nome da publicação à qual a assinatura pertence para PublicationName.
O nome do banco de dados de assinatura para SubscriptionDBName.
O nome do Assinante para SubscriberName.
A conexão criada na etapa 1 para ConnectionContext.
Chame o método LoadProperties para obter as demais propriedades da assinatura. Se este método retornar false, verifique se a assinatura existe.
Inicie o Merge Agent no Distribuidor de uma das seguintes maneiras:
Chame o método SynchronizeWithJob na instância de MergeSubscription da etapa 2. Este método inicia o Merge Agent de forma assíncrona e o controle retorna imediatamente para o seu aplicativo com o trabalho do agente em execução. Você não poderá chamar este método se a assinatura foi criada com um valor de false para CreateSyncAgentByDefault.
Obtenha uma instância de classe MergeSynchronizationAgent da propriedade SynchronizationAgent e chame o método Synchronize. Este método inicia o Merge Agent de forma síncrona e o controle permanece com o trabalho do agente em execução. Durante execução síncrona, você pode manipular o evento Status com o agente em execução.
Exemplo
Este exemplo sincroniza a assinatura push a uma publicação transacional, onde o agente é iniciado de forma assíncrona usando o trabalho do agente.
// Define the server, publication, and database names.
string subscriberName = subscriberInstance;
string publisherName = publisherInstance;
string publicationName = "AdvWorksProductTran";
string subscriptionDbName = "AdventureWorksReplica";
string publicationDbName = "AdventureWorks";
/// Create a connection to the Publisher.
ServerConnection conn = new ServerConnection(publisherName);
TransSubscription subscription;
try
{
// Connect to the Publisher.
conn.Connect();
// Instantiate the push subscription.
subscription = new TransSubscription();
subscription.ConnectionContext = conn;
subscription.DatabaseName = publicationDbName;
subscription.PublicationName = publicationName;
subscription.SubscriptionDBName = subscriptionDbName;
subscription.SubscriberName = subscriberName;
// If the push subscription and the job exists, start the agent job.
if (subscription.LoadProperties() && subscription.AgentJobId != null)
{
// Start the Distribution Agent asynchronously.
subscription.SynchronizeWithJob();
}
else
{
// Do something here if the subscription does not exist.
throw new ApplicationException(String.Format(
"A subscription to '{0}' does not exists on {1}",
publicationName, subscriberName));
}
}
catch (Exception ex)
{
// Implement appropriate error handling here.
throw new ApplicationException("The subscription could not be synchronized.", ex);
}
finally
{
conn.Disconnect();
}
' Define the server, publication, and database names.
Dim subscriberName As String = subscriberInstance
Dim publisherName As String = publisherInstance
Dim publicationName As String = "AdvWorksProductTran"
Dim subscriptionDbName As String = "AdventureWorksReplica"
Dim publicationDbName As String = "AdventureWorks"
' Create a connection to the Publisher.
Dim conn As ServerConnection = New ServerConnection(publisherName)
Dim subscription As TransSubscription
Try
' Connect to the Publisher.
conn.Connect()
' Instantiate the push subscription.
subscription = New TransSubscription()
subscription.ConnectionContext = conn
subscription.DatabaseName = publicationDbName
subscription.PublicationName = publicationName
subscription.SubscriptionDBName = subscriptionDbName
subscription.SubscriberName = subscriberName
' If the push subscription and the job exists, start the agent job.
If subscription.LoadProperties() And Not subscription.AgentJobId Is Nothing Then
' Start the Distribution Agent asynchronously.
subscription.SynchronizeWithJob()
Else
' Do something here if the subscription does not exist.
Throw New ApplicationException(String.Format( _
"A subscription to '{0}' does not exists on {1}", _
publicationName, subscriberName))
End If
Catch ex As Exception
' Implement appropriate error handling here.
Throw New ApplicationException("The subscription could not be synchronized.", ex)
Finally
conn.Disconnect()
End Try
Este exemplo sincroniza a assinatura push a uma publicação transacional, onde o agente é iniciado de forma síncrona.
// Define the server, publication, and database names.
string subscriberName = subscriberInstance;
string publisherName = publisherInstance;
string publicationName = "AdvWorksProductTran";
string subscriptionDbName = "AdventureWorksReplica";
string publicationDbName = "AdventureWorks";
// Create a connection to the Publisher.
ServerConnection conn = new ServerConnection(publisherName);
TransSubscription subscription;
try
{
// Connect to the Publisher.
conn.Connect();
// Define the push subscription.
subscription = new TransSubscription();
subscription.ConnectionContext = conn;
subscription.DatabaseName = publicationDbName;
subscription.PublicationName = publicationName;
subscription.SubscriptionDBName = subscriptionDbName;
subscription.SubscriberName = subscriberName;
// If the push subscription exists, start the synchronization.
if (subscription.LoadProperties())
{
// Check that we have enough metadata to start the agent.
if (subscription.SubscriberSecurity != null)
{
// Synchronously start the Distribution Agent for the subscription.
subscription.SynchronizationAgent.Synchronize();
}
else
{
throw new ApplicationException("There is insufficent metadata to " +
"synchronize the subscription. Recreate the subscription with " +
"the agent job or supply the required agent properties at run time.");
}
}
else
{
// Do something here if the push subscription does not exist.
throw new ApplicationException(String.Format(
"The subscription to '{0}' does not exist on {1}",
publicationName, subscriberName));
}
}
catch (Exception ex)
{
// Implement appropriate error handling here.
throw new ApplicationException("The subscription could not be synchronized.", ex);
}
finally
{
conn.Disconnect();
}
' Define the server, publication, and database names.
Dim subscriberName As String = subscriberInstance
Dim publisherName As String = publisherInstance
Dim publicationName As String = "AdvWorksProductTran"
Dim subscriptionDbName As String = "AdventureWorksReplica"
Dim publicationDbName As String = "AdventureWorks"
' Create a connection to the Publisher.
Dim conn As ServerConnection = New ServerConnection(publisherName)
Dim subscription As TransSubscription
Try
' Connect to the Publisher.
conn.Connect()
' Define the push subscription.
subscription = New TransSubscription()
subscription.ConnectionContext = conn
subscription.DatabaseName = publicationDbName
subscription.PublicationName = publicationName
subscription.SubscriptionDBName = subscriptionDbName
subscription.SubscriberName = subscriberName
' If the push subscription exists, start the synchronization.
If subscription.LoadProperties() Then
' Check that we have enough metadata to start the agent.
If Not subscription.SubscriberSecurity Is Nothing Then
' Synchronously start the Distribution Agent for the subscription.
subscription.SynchronizationAgent.Synchronize()
Else
Throw New ApplicationException("There is insufficent metadata to " + _
"synchronize the subscription. Recreate the subscription with " + _
"the agent job or supply the required agent properties at run time.")
End If
Else
' Do something here if the push subscription does not exist.
Throw New ApplicationException(String.Format( _
"The subscription to '{0}' does not exist on {1}", _
publicationName, subscriberName))
End If
Catch ex As Exception
' Implement appropriate error handling here.
Throw New ApplicationException("The subscription could not be synchronized.", ex)
Finally
conn.Disconnect()
End Try
Este exemplo sincroniza a assinatura push a uma publicação de mesclagem, onde o agente é iniciado de forma assíncrona usando o trabalho do agente.
// Define the server, publication, and database names.
string subscriberName = subscriberInstance;
string publisherName = publisherInstance;
string publicationName = "AdvWorksSalesOrdersMerge";
string subscriptionDbName = "AdventureWorksReplica";
string publicationDbName = "AdventureWorks";
// Create a connection to the Publisher.
ServerConnection conn = new ServerConnection(publisherName);
MergeSubscription subscription;
try
{
// Connect to the Publisher.
conn.Connect();
// Define push subscription.
subscription = new MergeSubscription();
subscription.ConnectionContext = conn;
subscription.DatabaseName = publicationDbName;
subscription.PublicationName = publicationName;
subscription.SubscriptionDBName = subscriptionDbName;
subscription.SubscriberName = subscriberName;
// If the push subscription and the job exists, start the agent job.
if (subscription.LoadProperties() && subscription.AgentJobId != null)
{
// Start the Merge Agent asynchronously.
subscription.SynchronizeWithJob();
}
else
{
// Do something here if the subscription does not exist.
throw new ApplicationException(String.Format(
"A subscription to '{0}' does not exists on {1}",
publicationName, subscriberName));
}
}
catch (Exception ex)
{
// Implement appropriate error handling here.
throw new ApplicationException("The subscription could not be synchronized.", ex);
}
finally
{
conn.Disconnect();
}
' Define the server, publication, and database names.
Dim subscriberName As String = subscriberInstance
Dim publisherName As String = publisherInstance
Dim publicationName As String = "AdvWorksSalesOrdersMerge"
Dim subscriptionDbName As String = "AdventureWorksReplica"
Dim publicationDbName As String = "AdventureWorks"
' Create a connection to the Publisher.
Dim conn As ServerConnection = New ServerConnection(publisherName)
Dim subscription As MergeSubscription
Try
' Connect to the Publisher.
conn.Connect()
' Define push subscription.
subscription = New MergeSubscription()
subscription.ConnectionContext = conn
subscription.DatabaseName = publicationDbName
subscription.PublicationName = publicationName
subscription.SubscriptionDBName = subscriptionDbName
subscription.SubscriberName = subscriberName
' If the push subscription and the job exists, start the agent job.
If subscription.LoadProperties() And Not subscription.AgentJobId Is Nothing Then
' Start the Merge Agent asynchronously.
subscription.SynchronizeWithJob()
Else
' Do something here if the subscription does not exist.
Throw New ApplicationException(String.Format( _
"A subscription to '{0}' does not exists on {1}", _
publicationName, subscriberName))
End If
Catch ex As Exception
' Implement appropriate error handling here.
Throw New ApplicationException("The subscription could not be synchronized.", ex)
Finally
conn.Disconnect()
End Try
Este exemplo sincroniza a assinatura push a uma publicação de mesclagem, onde o agente é iniciado de forma síncrona.
// Define the server, publication, and database names.
string subscriberName = subscriberInstance;
string publisherName = publisherInstance;
string publicationName = "AdvWorksSalesOrdersMerge";
string subscriptionDbName = "AdventureWorksReplica";
string publicationDbName = "AdventureWorks";
// Create a connection to the Publisher.
ServerConnection conn = new ServerConnection(publisherName);
MergeSubscription subscription;
try
{
// Connect to the Publisher
conn.Connect();
// Define the subscription.
subscription = new MergeSubscription();
subscription.ConnectionContext = conn;
subscription.DatabaseName = publicationDbName;
subscription.PublicationName = publicationName;
subscription.SubscriptionDBName = subscriptionDbName;
subscription.SubscriberName = subscriberName;
// If the push subscription exists, start the synchronization.
if (subscription.LoadProperties())
{
// Check that we have enough metadata to start the agent.
if (subscription.SubscriberSecurity != null)
{
// Synchronously start the Merge Agent for the subscription.
subscription.SynchronizationAgent.Synchronize();
}
else
{
throw new ApplicationException("There is insufficent metadata to " +
"synchronize the subscription. Recreate the subscription with " +
"the agent job or supply the required agent properties at run time.");
}
}
else
{
// Do something here if the push subscription does not exist.
throw new ApplicationException(String.Format(
"The subscription to '{0}' does not exist on {1}",
publicationName, subscriberName));
}
}
catch (Exception ex)
{
// Implement appropriate error handling here.
throw new ApplicationException("The subscription could not be synchronized.", ex);
}
finally
{
conn.Disconnect();
}
' Define the server, publication, and database names.
Dim subscriberName As String = subscriberInstance
Dim publisherName As String = publisherInstance
Dim publicationName As String = "AdvWorksSalesOrdersMerge"
Dim subscriptionDbName As String = "AdventureWorksReplica"
Dim publicationDbName As String = "AdventureWorks"
' Create a connection to the Publisher.
Dim conn As ServerConnection = New ServerConnection(publisherName)
Dim subscription As MergeSubscription
Try
' Connect to the Publisher
conn.Connect()
' Define the subscription.
subscription = New MergeSubscription()
subscription.ConnectionContext = conn
subscription.DatabaseName = publicationDbName
subscription.PublicationName = publicationName
subscription.SubscriptionDBName = subscriptionDbName
subscription.SubscriberName = subscriberName
' If the push subscription exists, start the synchronization.
If subscription.LoadProperties() Then
' Check that we have enough metadata to start the agent.
If Not subscription.SubscriberSecurity Is Nothing Then
' Synchronously start the Merge Agent for the subscription.
' Log agent messages to an output file.
subscription.SynchronizationAgent.Output = "mergeagent.log"
subscription.SynchronizationAgent.OutputVerboseLevel = 2
subscription.SynchronizationAgent.Synchronize()
Else
Throw New ApplicationException("There is insufficent metadata to " + _
"synchronize the subscription. Recreate the subscription with " + _
"the agent job or supply the required agent properties at run time.")
End If
Else
' Do something here if the push subscription does not exist.
Throw New ApplicationException(String.Format( _
"The subscription to '{0}' does not exist on {1}", _
publicationName, subscriberName))
End If
Catch ex As Exception
' Implement appropriate error handling here.
Throw New ApplicationException("The subscription could not be synchronized.", ex)
Finally
conn.Disconnect()
End Try