ADO.NET Provider for Apache HBase

Build 21.0.7930

Batch Processing

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

ApacheHBaseDataAdapter adapter = new ApacheHBaseDataAdapter();

using (ApacheHBaseConnection conn = new ApacheHBaseConnection("Server=127.0.0.1;Port=8080;")) {
  conn.Open();
  adapter.InsertCommand = conn.CreateCommand();
  adapter.InsertCommand.CommandText = "INSERT INTO Account (Name) VALUES (@Name)";
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
  adapter.InsertCommand.Parameters.Add("@Name", "Name");

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

VB.NET

 
Dim adapter As New ApacheHBaseDataAdapter()

Using conn As New ApacheHBaseConnection("Server=127.0.0.1;Port=8080;")
  conn.Open()
  adapter.InsertCommand = conn.CreateCommand()
  adapter.InsertCommand.CommandText = "INSERT INTO Account (Id) VALUES (@Name)"
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None
  adapter.InsertCommand.Parameters.Add("@Name", "Name")

  Dim batchDataTable As New DataTable()
  batchDataTable.Columns.Add("Name", GetType(String))
  batchDataTable.Rows.Add("Floppy Disks")
  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#

ApacheHBaseDataAdapter adapter = new ApacheHBaseDataAdapter();

using (ApacheHBaseConnection conn = new ApacheHBaseConnection("Server=127.0.0.1;Port=8080;")) { 
  conn.Open();
  adapter.UpdateCommand = conn.CreateCommand();
  adapter.UpdateCommand.CommandText = "UPDATE Account SET Name=@Name WHERE Id=@Id";
  adapter.UpdateCommand.Parameters.Add("@Name", "Name");
  adapter.UpdateCommand.Parameters.Add("@Id", "Id");
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None; 
  adapter.UpdateBatchSize = 2;
  adapter.Update(dataTable);
}

VB.NET

 
Dim adapter As New ApacheHBaseDataAdapter()

Using conn As New ApacheHBaseConnection("Server=127.0.0.1;Port=8080;")
  conn.Open()
  adapter.UpdateCommand = conn.CreateCommand()
  adapter.UpdateCommand.CommandText = "UPDATE Account SET Name=@Name WHERE Id=@Id"
  adapter.UpdateCommand.Parameters.Add("@Name", "Name")
  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#

ApacheHBaseDataAdapter adapter = new ApacheHBaseDataAdapter();

using (ApacheHBaseConnection conn = new ApacheHBaseConnection("Server=127.0.0.1;Port=8080;")) {
  conn.Open();
  adapter.DeleteCommand = conn.CreateCommand();
  adapter.DeleteCommand.CommandText = "DELETE FROM Account 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 ApacheHBaseDataAdapter()

Using conn As New ApacheHBaseConnection("Server=127.0.0.1;Port=8080;")
  conn.Open()
  adapter.DeleteCommand = conn.CreateCommand()
  adapter.DeleteCommand.CommandText = "DELETE FROM Account WHERE Id=@Id"
  adapter.DeleteCommand.Parameters.Add("@Id", "Id")
  adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None 
  adapter.UpdateBatchSize = 2
  adpater.Update(table)
End Using

Copyright (c) 2021 CData Software, Inc. - All rights reserved.
Build 21.0.7930