The CData ADO.NET Provider for HarperDB enables you to take advantage of the bulk load support in HarperDB through HarperDBDataAdapters. 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 HarperDBCommand objects.
2. Set the UpdatedRowSource property of the HarperDBCommand object to "UpdateRowSource.None".
3. Assign the HarperDBCommand objects to the HarperDBDataAdapter.
4. Add the parameters to the command.
5. Call the HarperDBDataAdapter'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 HarperDBDataAdapter'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#

HarperDBDataAdapter adapter = new HarperDBDataAdapter();

using (HarperDBConnection conn = new HarperDBConnection("Server=127.0.0.1;User=admin;Password=1234;Port=9925;")) {
  conn.Open();
  adapter.InsertCommand = conn.CreateCommand();
  adapter.InsertCommand.CommandText = "INSERT INTO [HarperDB].[cstest].Cutomers (CompanyName) VALUES (@CompanyName)";
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
  adapter.InsertCommand.Parameters.Add("@CompanyName", "CompanyName");

  DataTable batchDataTable = new DataTable();
  batchDataTable.Columns.Add("CompanyName", typeof(string));
  batchDataTable.Rows.Add("Jon Deere");
  batchDataTable.Rows.Add("RSSBus Inc.");
  adapter.UpdateBatchSize = 2;
  adapter.Update(batchDataTable);
}

VB.NET

 
Dim adapter As New HarperDBDataAdapter()

Using conn As New HarperDBConnection("Server=127.0.0.1;User=admin;Password=1234;Port=9925;")
  conn.Open()
  adapter.InsertCommand = conn.CreateCommand()
  adapter.InsertCommand.CommandText = "INSERT INTO [HarperDB].[cstest].Cutomers (City) VALUES (@CompanyName)"
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None
  adapter.InsertCommand.Parameters.Add("@CompanyName", "CompanyName")

  Dim batchDataTable As New DataTable()
  batchDataTable.Columns.Add("CompanyName", GetType(String))
  batchDataTable.Rows.Add("RSSBus Inc.")
  batchDataTable.Rows.Add("Jon Deere")
  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#

HarperDBDataAdapter adapter = new HarperDBDataAdapter();

using (HarperDBConnection conn = new HarperDBConnection("Server=127.0.0.1;User=admin;Password=1234;Port=9925;")) { 
  conn.Open();
  adapter.UpdateCommand = conn.CreateCommand();
  adapter.UpdateCommand.CommandText = "UPDATE [HarperDB].[cstest].Cutomers SET CompanyName=@CompanyName WHERE _id=@_id";
  adapter.UpdateCommand.Parameters.Add("@CompanyName", "CompanyName");
  adapter.UpdateCommand.Parameters.Add("@_id", "_id");
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None; 
  DataTable batchDataTable = new DataTable();
  batchDataTable.Columns.Add("CompanyName", typeof(string));
  batchDataTable.Rows.Add("Jon Deere");
  batchDataTable.Rows.Add("RSSBus Inc.");
  adapter.UpdateBatchSize = 2;
  adapter.Update(dataTable);
}

VB.NET

 
Dim adapter As New HarperDBDataAdapter()

Using conn As New HarperDBConnection("Server=127.0.0.1;User=admin;Password=1234;Port=9925;")
  conn.Open()
  adapter.UpdateCommand = conn.CreateCommand()
  adapter.UpdateCommand.CommandText = "UPDATE [HarperDB].[cstest].Cutomers SET CompanyName=@CompanyName WHERE _id=@_id"
  adapter.UpdateCommand.Parameters.Add("@CompanyName", "CompanyName")
  adapter.UpdateCommand.Parameters.Add("@_id", "_id")
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None
  Dim batchDataTable As New DataTable()
  batchDataTable.Columns.Add("CompanyName", GetType(String))
  batchDataTable.Rows.Add("RSSBus Inc.")
  batchDataTable.Rows.Add("Jon Deere")
  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#

HarperDBDataAdapter adapter = new HarperDBDataAdapter();

using (HarperDBConnection conn = new HarperDBConnection("Server=127.0.0.1;User=admin;Password=1234;Port=9925;")) {
  conn.Open();
  adapter.DeleteCommand = conn.CreateCommand();
  adapter.DeleteCommand.CommandText = "DELETE FROM [HarperDB].[cstest].Cutomers 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 HarperDBDataAdapter()

Using conn As New HarperDBConnection("Server=127.0.0.1;User=admin;Password=1234;Port=9925;")
  conn.Open()
  adapter.DeleteCommand = conn.CreateCommand()
  adapter.DeleteCommand.CommandText = "DELETE FROM [HarperDB].[cstest].Cutomers WHERE _id=@_id"
  adapter.DeleteCommand.Parameters.Add("@_id", "_id")
  adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None 
  adapter.UpdateBatchSize = 2
  adpater.Update(table)
End Using