The CData ADO.NET Provider for Google Contacts enables you to take advantage of the bulk load support in GoogleContacts through GoogleContactsDataAdapters. You can use the Batch API to execute related SQL data manipulation statements simultaneously. The provider translates all SQL queries in the batch into a single request.

Using the ADO.NET Batch API

Performing a batch update consists of the following basic steps:

1. Define custom parameterized SQL statements in GoogleContactsCommand objects.
2. Set the UpdatedRowSource property of the GoogleContactsCommand object to "UpdateRowSource.None".
3. Assign the GoogleContactsCommand objects to the GoogleContactsDataAdapter.
4. Add the parameters to the command.
5. Call the GoogleContactsDataAdapter's Update method. Pass in a DataSet or DataTable containing your changes.

Controlling Batch Size

Depending on factors such as the size of the request, your network resources, and the performance of the server, you may gain performance by executing several smaller batch requests. You can control the size of each batch by setting the GoogleContactsDataAdapter's UpdateBatchSize property to a positive integer.

Bulk INSERT

The following code prepares a single batch that inserts records in bulk. The example executes a batch INSERT of new DataRows, which have the "Added" state.

C#

GoogleContactsDataAdapter adapter = new GoogleContactsDataAdapter();

using (GoogleContactsConnection conn = new GoogleContactsConnection("InitiateOAuth=GETANDREFRESH;")) {
  conn.Open();
  adapter.InsertCommand = conn.CreateCommand();
  adapter.InsertCommand.CommandText = "INSERT INTO [My Contacts] (HomeEmailAddresses) VALUES (@HomeEmailAddresses)";
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
  adapter.InsertCommand.Parameters.Add("@HomeEmailAddresses", "HomeEmailAddresses");

  DataTable batchDataTable = new DataTable();
  batchDataTable.Columns.Add("HomeEmailAddresses", typeof(string));
  batchDataTable.Rows.Add("Jon Doe");
  batchDataTable.Rows.Add("John");
  adapter.UpdateBatchSize = 2;
  adapter.Update(batchDataTable);
}

VB.NET

 
Dim adapter As New GoogleContactsDataAdapter()

Using conn As New GoogleContactsConnection("InitiateOAuth=GETANDREFRESH;")
  conn.Open()
  adapter.InsertCommand = conn.CreateCommand()
  adapter.InsertCommand.CommandText = "INSERT INTO [My Contacts] (GivenName) VALUES (@HomeEmailAddresses)"
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None
  adapter.InsertCommand.Parameters.Add("@HomeEmailAddresses", "HomeEmailAddresses")

  Dim batchDataTable As New DataTable()
  batchDataTable.Columns.Add("HomeEmailAddresses", GetType(String))
  batchDataTable.Rows.Add("John")
  batchDataTable.Rows.Add("Jon Doe")
  adapter.UpdateBatchSize = 2
  adapter.Update(batchDataTable)
End Using

Bulk Update

A batch update additionally requires the primary key of each row to update. The following example executes a batch for all DataRow records with a "Modified" state:

C#

GoogleContactsDataAdapter adapter = new GoogleContactsDataAdapter();

using (GoogleContactsConnection conn = new GoogleContactsConnection("InitiateOAuth=GETANDREFRESH;")) { 
  conn.Open();
  adapter.UpdateCommand = conn.CreateCommand();
  adapter.UpdateCommand.CommandText = "UPDATE [My Contacts] SET HomeEmailAddresses=@HomeEmailAddresses WHERE Id=@Id";
  adapter.UpdateCommand.Parameters.Add("@HomeEmailAddresses", "HomeEmailAddresses");
  adapter.UpdateCommand.Parameters.Add("@Id", "Id");
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None; 
  adapter.UpdateBatchSize = 2;
  adapter.Update(dataTable);
}

VB.NET

 
Dim adapter As New GoogleContactsDataAdapter()

Using conn As New GoogleContactsConnection("InitiateOAuth=GETANDREFRESH;")
  conn.Open()
  adapter.UpdateCommand = conn.CreateCommand()
  adapter.UpdateCommand.CommandText = "UPDATE [My Contacts] SET HomeEmailAddresses=@HomeEmailAddresses WHERE Id=@Id"
  adapter.UpdateCommand.Parameters.Add("@HomeEmailAddresses", "HomeEmailAddresses")
  adapter.UpdateCommand.Parameters.Add("@Id", "Id")
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None
  adapter.UpdateBatchSize = 2
  adapter.Update(dataTable)
End Using

Bulk Delete

The following code prepares a single batch that deletes records in bulk. The primary key for each row is required. The following example executes a batch for all DataRow records with a "Deleted" state:

C#

GoogleContactsDataAdapter adapter = new GoogleContactsDataAdapter();

using (GoogleContactsConnection conn = new GoogleContactsConnection("InitiateOAuth=GETANDREFRESH;")) {
  conn.Open();
  adapter.DeleteCommand = conn.CreateCommand();
  adapter.DeleteCommand.CommandText = "DELETE FROM [My Contacts] WHERE Id=@Id";
  adapter.DeleteCommand.Parameters.Add("@Id", "Id");
  adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None; 
  adapter.UpdateBatchSize = 2;
  adpater.Update(table);
}

VB.NET

Dim adapter As New GoogleContactsDataAdapter()

Using conn As New GoogleContactsConnection("InitiateOAuth=GETANDREFRESH;")
  conn.Open()
  adapter.DeleteCommand = conn.CreateCommand()
  adapter.DeleteCommand.CommandText = "DELETE FROM [My Contacts] WHERE Id=@Id"
  adapter.DeleteCommand.Parameters.Add("@Id", "Id")
  adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None 
  adapter.UpdateBatchSize = 2
  adpater.Update(table)
End Using