Свойство IsExistingObject
Gets whether the object exists on the server or not.
Пространство имен: Microsoft.SqlServer.Replication
Сборка: Microsoft.SqlServer.Rmo (в Microsoft.SqlServer.Rmo.dll)
Синтаксис
'Декларация
Public ReadOnly Property IsExistingObject As Boolean
Get
'Применение
Dim instance As ReplicationObject
Dim value As Boolean
value = instance.IsExistingObject
public bool IsExistingObject { get; }
public:
property bool IsExistingObject {
bool get ();
}
member IsExistingObject : bool
function get IsExistingObject () : boolean
Значение свойства
Тип System. . :: . .Boolean
A Boolean value. If true, the object represents an existing object. If false, the object represents an object that does not yet exist.
Замечания
If the object does not have sufficient information, IsExistingObject returns false.
This property is available with SQL Server 7.0, SQL Server 2000, and SQL Server 2005.
This namespace, class, or member is supported only in version 2.0 of the .NET Framework.
Примеры
// Set the Publisher, publication database, and publication names.
string publicationName = "AdvWorksProductTran";
string publicationDbName = "AdventureWorks";
string publisherName = publisherInstance;
ReplicationDatabase publicationDb;
TransPublication publication;
// Create a connection to the Publisher using Windows Authentication.
ServerConnection conn;
conn = new ServerConnection(publisherName);
try
{
// Connect to the Publisher.
conn.Connect();
// Enable the AdventureWorks database for transactional publishing.
publicationDb = new ReplicationDatabase(publicationDbName, conn);
// If the database exists and is not already enabled,
// enable it for transactional publishing.
if (publicationDb.LoadProperties())
{
if (!publicationDb.EnabledTransPublishing)
{
publicationDb.EnabledTransPublishing = true;
}
// If the Log Reader Agent does not exist, create it.
if (!publicationDb.LogReaderAgentExists)
{
// Specify the Windows account under which the agent job runs.
// This account will be used for the local connection to the
// Distributor and all agent connections that use Windows Authentication.
publicationDb.LogReaderAgentProcessSecurity.Login = winLogin;
publicationDb.LogReaderAgentProcessSecurity.Password = winPassword;
// Explicitly set authentication mode for the Publisher connection
// to the default value of Windows Authentication.
publicationDb.LogReaderAgentPublisherSecurity.WindowsAuthentication = true;
// Create the Log Reader Agent job.
publicationDb.CreateLogReaderAgent();
}
}
else
{
throw new ApplicationException(String.Format(
"The {0} database does not exist at {1}.",
publicationDb, publisherName));
}
// Set the required properties for the transactional publication.
publication = new TransPublication();
publication.ConnectionContext = conn;
publication.Name = publicationName;
publication.DatabaseName = publicationDbName;
// Specify a transactional publication (the default).
publication.Type = PublicationType.Transactional;
// Activate the publication so that we can add subscriptions.
publication.Status = State.Active;
// Enable push and pull subscriptions and independent Distribition Agents.
publication.Attributes |= PublicationAttributes.AllowPull;
publication.Attributes |= PublicationAttributes.AllowPush;
publication.Attributes |= PublicationAttributes.IndependentAgent;
// Specify the Windows account under which the Snapshot Agent job runs.
// This account will be used for the local connection to the
// Distributor and all agent connections that use Windows Authentication.
publication.SnapshotGenerationAgentProcessSecurity.Login = winLogin;
publication.SnapshotGenerationAgentProcessSecurity.Password = winPassword;
// Explicitly set the security mode for the Publisher connection
// Windows Authentication (the default).
publication.SnapshotGenerationAgentPublisherSecurity.WindowsAuthentication = true;
if (!publication.IsExistingObject)
{
// Create the transactional publication.
publication.Create();
// Create a Snapshot Agent job for the publication.
publication.CreateSnapshotAgent();
}
else
{
throw new ApplicationException(String.Format(
"The {0} publication already exists.", publicationName));
}
}
catch (Exception ex)
{
// Implement custom application error handling here.
throw new ApplicationException(String.Format(
"The publication {0} could not be created.", publicationName), ex);
}
finally
{
conn.Disconnect();
}
' Set the Publisher, publication database, and publication names.
Dim publicationName As String = "AdvWorksProductTran"
Dim publicationDbName As String = "AdventureWorks"
Dim publisherName As String = publisherInstance
Dim publicationDb As ReplicationDatabase
Dim publication As TransPublication
' Create a connection to the Publisher using Windows Authentication.
Dim conn As ServerConnection
conn = New ServerConnection(publisherName)
Try
' Connect to the Publisher.
conn.Connect()
' Enable the AdventureWorks database for transactional publishing.
publicationDb = New ReplicationDatabase(publicationDbName, conn)
' If the database exists and is not already enabled,
' enable it for transactional publishing.
If publicationDb.LoadProperties() Then
If Not publicationDb.EnabledTransPublishing Then
publicationDb.EnabledTransPublishing = True
End If
' If the Log Reader Agent does not exist, create it.
If Not publicationDb.LogReaderAgentExists Then
' Specify the Windows account under which the agent job runs.
' This account will be used for the local connection to the
' Distributor and all agent connections that use Windows Authentication.
publicationDb.LogReaderAgentProcessSecurity.Login = winLogin
publicationDb.LogReaderAgentProcessSecurity.Password = winPassword
' Explicitly set authentication mode for the Publisher connection
' to the default value of Windows Authentication.
publicationDb.LogReaderAgentPublisherSecurity.WindowsAuthentication = True
' Create the Log Reader Agent job.
publicationDb.CreateLogReaderAgent()
End If
Else
Throw New ApplicationException(String.Format( _
"The {0} database does not exist at {1}.", _
publicationDb, publisherName))
End If
' Set the required properties for the transactional publication.
publication = New TransPublication()
publication.ConnectionContext = conn
publication.Name = publicationName
publication.DatabaseName = publicationDbName
' Specify a transactional publication (the default).
publication.Type = PublicationType.Transactional
'Enable push and pull subscriptions and independent Distribition Agents.
publication.Attributes = _
publication.Attributes Or PublicationAttributes.AllowPull
publication.Attributes = _
publication.Attributes Or PublicationAttributes.AllowPush
publication.Attributes = _
publication.Attributes Or PublicationAttributes.IndependentAgent
' Activate the publication so that we can add subscriptions.
publication.Status = State.Active
' Specify the Windows account under which the Snapshot Agent job runs.
' This account will be used for the local connection to the
' Distributor and all agent connections that use Windows Authentication.
publication.SnapshotGenerationAgentProcessSecurity.Login = winLogin
publication.SnapshotGenerationAgentProcessSecurity.Password = winPassword
' Explicitly set the security mode for the Publisher connection
' Windows Authentication (the default).
publication.SnapshotGenerationAgentPublisherSecurity.WindowsAuthentication = True
If Not publication.IsExistingObject Then
' Create the transactional publication.
publication.Create()
' Create a Snapshot Agent job for the publication.
publication.CreateSnapshotAgent()
Else
Throw New ApplicationException(String.Format( _
"The {0} publication already exists.", publicationName))
End If
Catch ex As Exception
' Implement custom application error handling here.
Throw New ApplicationException(String.Format( _
"The publication {0} could not be created.", publicationName), ex)
Finally
conn.Disconnect()
End Try