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How to: Define an Article (RMO Programming)

You can define articles programmatically by using Replication Management Objects (RMO). The RMO classes that you use to define an article depend on the type of publication for which the article is defined.

To define articles for a snapshot or transactional publication

  1. Create a connection to the Publisher by using the ServerConnection class.

  2. Create an instance of the TransArticle class, set the ConnectionContext property (inherited from ReplicationObject) to the instance of ServerConnection from step 1, and set the following properties:

    • The name of the article for Name.

    • The name of the publication for PublicationName.

    • The name of the publication database for DatabaseName.

    • (Optional) If the article has a static row filter, specify the filter clause for the FilterClause property.

  3. Call the Create method.

  4. (Optional) If the article has column filters:

    • Call the RemoveReplicatedColumns method to remove columns from the article. Pass a String array of the names of columns to remove. Pass a null value to remove all columns.

    • Call the AddReplicatedColumns method to add columns to the article. Pass a String array of the names of columns to add. Pass a null value to add all columns.

To define articles for a merge publication

  1. Create a connection to the Publisher by using the ServerConnection class.

  2. Create an instance of the MergeArticle class, set the ConnectionContext property (inherited from ReplicationObject) to the instance of ServerConnection from step 1, and set the following properties:

    • The name of the article for Name.

    • The name of the publication forPublicationName.

    • The name of the publication database for DatabaseName.

    • (Optional) If the article is horizontally filtered, specify the row filter clause for the FilterClause property. Use this property to specify a static or parameterized row filter. For more information, see Parameterized Row Filters.

  3. Call the Create method.

  4. (Optional) If the article has filtered columns:

    • Call the RemoveReplicatedColumns method to remove columns from the article. Pass a String array of the names of columns to remove. Pass a null value to remove all columns.

    • Call the AddReplicatedColumns method to add columns to the article. Pass a String array of the names of columns to add. Pass a null value to add all columns.

  5. (Optional) If the article must be filtered based on the row filter defined on another article, create an instance of the MergeJoinFilter class to define the join filter between two articles. Then, set the following properties:

    • The name of the child article (from step 2) being filtered for the JoinArticleName property.

    • The name of the existing, filtered article to which this article is being joined for the ArticleName property.

    • A name for the join filter for the FilterName property.

    • The expression that defines the join for the JoinFilterClause property.

    • A value of JoinFilter for the FilterTypes property.

    For more information, see Join Filters.

  6. (Optional) Call the AddMergeJoinFilter method on the object that represents the filtered article from step 2. Pass the MergeJoinFilter object from step 5 to create the join filter.

The following example adds an article with row and column filters to a transactional publication.

			// Define the Publisher, publication, and article names.
			string publisherName = publisherInstance;
			string publicationName = "AdvWorksProductTran";
            string publicationDbName = "AdventureWorks2008R2";
			string articleName = "Product";
			string schemaOwner = "Production";

			TransArticle article;

			// Create a connection to the Publisher.
			ServerConnection conn = new ServerConnection(publisherName);

			// Create a filtered transactional articles in the following steps:
			// 1) Create the  article with a horizontal filter clause.
			// 2) Add columns to or remove columns from the article.
			try
			{
				// Connect to the Publisher.
				conn.Connect();

				// Define a horizontally filtered, log-based table article.
				article = new TransArticle();
				article.ConnectionContext = conn;
				article.Name = articleName;
				article.DatabaseName = publicationDbName;
				article.SourceObjectName = articleName;
				article.SourceObjectOwner = schemaOwner;
				article.PublicationName = publicationName;
				article.Type = ArticleOptions.LogBased;
				article.FilterClause = "DiscontinuedDate IS NULL";

				// Ensure that we create the schema owner at the Subscriber.
				article.SchemaOption |= CreationScriptOptions.Schema;

				if (!article.IsExistingObject)
				{
					// Create the article.
					article.Create();
				}
				else
				{
					throw new ApplicationException(String.Format(
						"The article {0} already exists in publication {1}.",
						articleName, publicationName));
				}

				// Create an array of column names to remove from the article.
				String[] columns = new String[1];
				columns[0] = "DaysToManufacture";

				// Remove the column from the article.
				article.RemoveReplicatedColumns(columns);
			}
			catch (Exception ex)
			{
				// Implement appropriate error handling here.
				throw new ApplicationException("The article could not be created.", ex);
			}
			finally
			{
				conn.Disconnect();
			}


' Define the Publisher, publication, and article names.
Dim publisherName As String = publisherInstance
Dim publicationName As String = "AdvWorksProductTran"
Dim publicationDbName As String = "AdventureWorks2008R2"
Dim articleName As String = "Product"
Dim schemaOwner As String = "Production"

Dim article As TransArticle

' Create a connection to the Publisher.
Dim conn As ServerConnection = New ServerConnection(publisherName)

' Create a filtered transactional articles in the following steps:
' 1) Create the  article with a horizontal filter clause.
' 2) Add columns to or remove columns from the article.
Try
    ' Connect to the Publisher.
    conn.Connect()

    ' Define a horizontally filtered, log-based table article.
    article = New TransArticle()
    article.ConnectionContext = conn
    article.Name = articleName
    article.DatabaseName = publicationDbName
    article.SourceObjectName = articleName
    article.SourceObjectOwner = schemaOwner
    article.PublicationName = publicationName
    article.Type = ArticleOptions.LogBased
    article.FilterClause = "DiscontinuedDate IS NULL"

    ' Ensure that we create the schema owner at the Subscriber.
    article.SchemaOption = article.SchemaOption Or _
    CreationScriptOptions.Schema

    If Not article.IsExistingObject Then
        ' Create the article.
        article.Create()
    Else
        Throw New ApplicationException(String.Format( _
         "The article {0} already exists in publication {1}.", _
         articleName, publicationName))
    End If

    ' Create an array of column names to remove from the article.
    Dim columns() As String = New String(0) {}
    columns(0) = "DaysToManufacture"

    ' Remove the column from the article.
    article.RemoveReplicatedColumns(columns)
Catch ex As Exception
    ' Implement appropriate error handling here.
    Throw New ApplicationException("The article could not be created.", ex)
Finally
    conn.Disconnect()
End Try


The following example adds three articles to a merge publication. The articles have column filters, and two join filters are used to propagate a parameterized row filter to the other articles.

			// Define the Publisher and publication names.
			string publisherName = publisherInstance;
			string publicationName = "AdvWorksSalesOrdersMerge";
            string publicationDbName = "AdventureWorks2008R2";

			// Specify article names.
			string articleName1 = "Employee";
			string articleName2 = "SalesOrderHeader";
			string articleName3 = "SalesOrderDetail";

			// Specify join filter information.
			string filterName12 = "SalesOrderHeader_Employee";
			string filterClause12 = "Employee.BusinessEntityID = " +
				"SalesOrderHeader.SalesPersonID";
			string filterName23 = "SalesOrderDetail_SalesOrderHeader";
			string filterClause23 = "SalesOrderHeader.SalesOrderID = " +
				"SalesOrderDetail.SalesOrderID";

			string salesSchema = "Sales";
			string hrSchema = "HumanResources";

			MergeArticle article1 = new MergeArticle();
			MergeArticle article2 = new MergeArticle();
			MergeArticle article3 = new MergeArticle();
			MergeJoinFilter filter12 = new MergeJoinFilter();
			MergeJoinFilter filter23 = new MergeJoinFilter();

			// Create a connection to the Publisher.
			ServerConnection conn = new ServerConnection(publisherName);

			// Create three merge articles that are horizontally partitioned
			// using a parameterized row filter on Employee.BusinessEntityID, which is 
			// extended to the two other articles using join filters. 
			try
			{
				// Connect to the Publisher.
				conn.Connect();

				// Create each article. 
				// For clarity, each article is defined separately. 
				// In practice, iterative structures and arrays should 
				// be used to efficiently create multiple articles.

				// Set the required properties for the Employee article.
				article1.ConnectionContext = conn;
				article1.Name = articleName1;
				article1.DatabaseName = publicationDbName;
				article1.SourceObjectName = articleName1;
				article1.SourceObjectOwner = hrSchema;
				article1.PublicationName = publicationName;
				article1.Type = ArticleOptions.TableBased;

				// Define the parameterized filter clause based on Hostname.
				article1.FilterClause = "Employee.LoginID = HOST_NAME()";

				// Set the required properties for the SalesOrderHeader article.
				article2.ConnectionContext = conn;
				article2.Name = articleName2;
				article2.DatabaseName = publicationDbName;
				article2.SourceObjectName = articleName2;
				article2.SourceObjectOwner = salesSchema;
				article2.PublicationName = publicationName;
				article2.Type = ArticleOptions.TableBased;

				// Set the required properties for the SalesOrderDetail article.
				article3.ConnectionContext = conn;
				article3.Name = articleName3;
				article3.DatabaseName = publicationDbName;
				article3.SourceObjectName = articleName3;
				article3.SourceObjectOwner = salesSchema;
				article3.PublicationName = publicationName;
				article3.Type = ArticleOptions.TableBased;

				if (!article1.IsExistingObject) article1.Create();
				if (!article2.IsExistingObject) article2.Create();
				if (!article3.IsExistingObject) article3.Create();

				// Select published columns for SalesOrderHeader.
				// Create an array of column names to vertically filter out.
				// In this example, only one column is removed.
				String[] columns = new String[1];

				columns[0] = "CreditCardApprovalCode";

				// Remove the column.
				article2.RemoveReplicatedColumns(columns);

				// Define a merge filter clauses that filter 
				// SalesOrderHeader based on Employee and 
				// SalesOrderDetail based on SalesOrderHeader. 

				// Parent article.
				filter12.JoinArticleName = articleName1;
				// Child article.
				filter12.ArticleName = articleName2;
				filter12.FilterName = filterName12;
				filter12.JoinUniqueKey = true;
				filter12.FilterTypes = FilterTypes.JoinFilter;
				filter12.JoinFilterClause = filterClause12;

				// Add the join filter to the child article.
				article2.AddMergeJoinFilter(filter12);

				// Parent article.
				filter23.JoinArticleName = articleName2;
				// Child article.
				filter23.ArticleName = articleName3;
				filter23.FilterName = filterName23;
				filter23.JoinUniqueKey = true;
				filter23.FilterTypes = FilterTypes.JoinFilter;
				filter23.JoinFilterClause = filterClause23;

				// Add the join filter to the child article.
				article3.AddMergeJoinFilter(filter23);
			}
			catch (Exception ex)
			{
				// Do error handling here and rollback the transaction.
				throw new ApplicationException(
					"The filtered articles could not be created", ex);
			}
			finally
			{
				conn.Disconnect();
			}


' Define the Publisher and publication names.
Dim publisherName As String = publisherInstance
Dim publicationName As String = "AdvWorksSalesOrdersMerge"
Dim publicationDbName As String = "AdventureWorks2008R2"

' Specify article names.
Dim articleName1 As String = "Employee"
Dim articleName2 As String = "SalesOrderHeader"
Dim articleName3 As String = "SalesOrderDetail"

' Specify join filter information.
Dim filterName12 As String = "SalesOrderHeader_Employee"
Dim filterClause12 As String = "Employee.BusinessEntityID = " + _
    "SalesOrderHeader.SalesPersonID"
Dim filterName23 As String = "SalesOrderDetail_SalesOrderHeader"
Dim filterClause23 As String = "SalesOrderHeader.SalesOrderID = " + _
    "SalesOrderDetail.SalesOrderID"

Dim salesSchema As String = "Sales"
Dim hrSchema As String = "HumanResources"

Dim article1 As MergeArticle = New MergeArticle()
Dim article2 As MergeArticle = New MergeArticle()
Dim article3 As MergeArticle = New MergeArticle()
Dim filter12 As MergeJoinFilter = New MergeJoinFilter()
Dim filter23 As MergeJoinFilter = New MergeJoinFilter()

' Create a connection to the Publisher.
Dim conn As ServerConnection = New ServerConnection(publisherName)

' Create three merge articles that are horizontally partitioned
' using a parameterized row filter on Employee.BusinessEntityID, which is 
' extended to the two other articles using join filters. 
Try
    ' Connect to the Publisher.
    conn.Connect()

    ' Create each article. 
    ' For clarity, each article is defined separately. 
    ' In practice, iterative structures and arrays should 
    ' be used to efficiently create multiple articles.

    ' Set the required properties for the Employee article.
    article1.ConnectionContext = conn
    article1.Name = articleName1
    article1.DatabaseName = publicationDbName
    article1.SourceObjectName = articleName1
    article1.SourceObjectOwner = hrSchema
    article1.PublicationName = publicationName
    article1.Type = ArticleOptions.TableBased

    ' Define the parameterized filter clause based on Hostname.
    article1.FilterClause = "Employee.LoginID = HOST_NAME()"

    ' Set the required properties for the SalesOrderHeader article.
    article2.ConnectionContext = conn
    article2.Name = articleName2
    article2.DatabaseName = publicationDbName
    article2.SourceObjectName = articleName2
    article2.SourceObjectOwner = salesSchema
    article2.PublicationName = publicationName
    article2.Type = ArticleOptions.TableBased

    ' Set the required properties for the SalesOrderDetail article.
    article3.ConnectionContext = conn
    article3.Name = articleName3
    article3.DatabaseName = publicationDbName
    article3.SourceObjectName = articleName3
    article3.SourceObjectOwner = salesSchema
    article3.PublicationName = publicationName
    article3.Type = ArticleOptions.TableBased

    ' Create the articles, if they do not already exist.
    If article1.IsExistingObject = False Then
        article1.Create()
    End If
    If article2.IsExistingObject = False Then
        article2.Create()
    End If
    If article3.IsExistingObject = False Then
        article3.Create()
    End If

    ' Select published columns for SalesOrderHeader.
    ' Create an array of column names to vertically filter out.
    ' In this example, only one column is removed.
    Dim columns() As String = New String(0) {}

    columns(0) = "CreditCardApprovalCode"

    ' Remove the column.
    article2.RemoveReplicatedColumns(columns)

    ' Define a merge filter clauses that filter 
    ' SalesOrderHeader based on Employee and 
    ' SalesOrderDetail based on SalesOrderHeader. 

    ' Parent article.
    filter12.JoinArticleName = articleName1
    ' Child article.
    filter12.ArticleName = articleName2
    filter12.FilterName = filterName12
    filter12.JoinUniqueKey = True
    filter12.FilterTypes = FilterTypes.JoinFilter
    filter12.JoinFilterClause = filterClause12

    ' Add the join filter to the child article.
    article2.AddMergeJoinFilter(filter12)

    ' Parent article.
    filter23.JoinArticleName = articleName2
    ' Child article.
    filter23.ArticleName = articleName3
    filter23.FilterName = filterName23
    filter23.JoinUniqueKey = True
    filter23.FilterTypes = FilterTypes.JoinFilter
    filter23.JoinFilterClause = filterClause23

    ' Add the join filter to the child article.
    article3.AddMergeJoinFilter(filter23)

Catch ex As Exception
    ' Do error handling here and rollback the transaction.
    Throw New ApplicationException( _
        "The filtered articles could not be created", ex)
Finally
    conn.Disconnect()
End Try


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