The CData ADO.NET Provider for Teradata enables you to take advantage of the bulk load support in Teradata through TeradataDataAdapters. You can use the Batch API to execute related SQL data manipulation statements simultaneously.

Using the ADO.NET Batch API

Performing a batch update consists of the following basic steps:

1. Define custom parameterized SQL statements in TeradataCommand objects.
2. Set the UpdatedRowSource property of the TeradataCommand object to "UpdateRowSource.None".
3. Assign the TeradataCommand objects to the TeradataDataAdapter.
4. Add the parameters to the command.
5. Call the TeradataDataAdapter'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 TeradataDataAdapter's UpdateBatchSize property to a positive integer.

Bulk INSERT

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

C#

TeradataDataAdapter adapter = new TeradataDataAdapter();

using (TeradataConnection conn = new TeradataConnection("User=Admin;Password=test123;Database=Northwind;DataSource=127.0.0.1")) {
  conn.Open();
  adapter.InsertCommand = conn.CreateCommand();
  adapter.InsertCommand.CommandText = "INSERT INTO \"CData\".\"dbo\".NorthwindProducts (ProductName) VALUES (@ProductName)";
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
  adapter.InsertCommand.Parameters.Add("@ProductName", "ProductName");

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

  TeradataCommand cmd = new TeradataCommand("SELECT * FROM LastResultInfo#TEMP", conn);
  adapter = new TeradataDataAdapter(cmd);
  DataTable res = new DataTable();
  adapter.Fill(res);
  foreach (DataRow row in res.Rows) 
    foreach(DataColumn col in res.Columns)
      Console.Write("{0}: {1}", col.ColumnName, row[col]);
}

VB.NET

 
Dim adapter As New TeradataDataAdapter()

Using conn As New TeradataConnection("User=Admin;Password=test123;Database=Northwind;DataSource=127.0.0.1")
  conn.Open()
  adapter.InsertCommand = conn.CreateCommand()
  adapter.InsertCommand.CommandText = "INSERT INTO \"CData\".\"dbo\".NorthwindProducts (ProductId) VALUES (@ProductName)"
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None
  adapter.InsertCommand.Parameters.Add("@ProductName", "ProductName")

  Dim batchDataTable As New DataTable()
  batchDataTable.Columns.Add("ProductName", GetType(String))
  batchDataTable.Rows.Add("Jane Doe")
  batchDataTable.Rows.Add("Jon Doe")
  adapter.UpdateBatchSize = 2
  adapter.Update(batchDataTable)

  Dim cmd As New TeradataCommand("SELECT * FROM LastResultInfo#TEMP", conn)
  adapter = New TeradataDataAdapter(cmd)
  Dim res As New DataTable()
  adapter.Fill(res)
  For Each row As DataRow In res.Rows 
    For Each col As DataColumn In res.Columns
      Console.WriteLine("{0}: {1}", col.ColumnName, row(col))
    Next
  Next
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#

TeradataDataAdapter adapter = new TeradataDataAdapter();

using (TeradataConnection conn = new TeradataConnection("User=Admin;Password=test123;Database=Northwind;DataSource=127.0.0.1")) { 
  conn.Open();
  adapter.UpdateCommand = conn.CreateCommand();
  adapter.UpdateCommand.CommandText = "UPDATE \"CData\".\"dbo\".NorthwindProducts SET ProductName=@ProductName WHERE ProductId=@ProductId";
  adapter.UpdateCommand.Parameters.Add("@ProductName", "ProductName");
  adapter.UpdateCommand.Parameters.Add("@ProductId", "ProductId");
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None; 
  adapter.UpdateBatchSize = 2;
  adapter.Update(dataTable);
}

VB.NET

 
Dim adapter As New TeradataDataAdapter()

Using conn As New TeradataConnection("User=Admin;Password=test123;Database=Northwind;DataSource=127.0.0.1")
  conn.Open()
  adapter.UpdateCommand = conn.CreateCommand()
  adapter.UpdateCommand.CommandText = "UPDATE \"CData\".\"dbo\".NorthwindProducts SET ProductName=@ProductName WHERE ProductId=@ProductId"
  adapter.UpdateCommand.Parameters.Add("@ProductName", "ProductName")
  adapter.UpdateCommand.Parameters.Add("@ProductId", "ProductId")
  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#

TeradataDataAdapter adapter = new TeradataDataAdapter();

using (TeradataConnection conn = new TeradataConnection("User=Admin;Password=test123;Database=Northwind;DataSource=127.0.0.1")) {
  conn.Open();
  adapter.DeleteCommand = conn.CreateCommand();
  adapter.DeleteCommand.CommandText = "DELETE FROM \"CData\".\"dbo\".NorthwindProducts WHERE ProductId=@ProductId";
  adapter.DeleteCommand.Parameters.Add("@ProductId", "ProductId");
  adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None; 
  adapter.UpdateBatchSize = 2;
  adpater.Update(table);
}

VB.NET

Dim adapter As New TeradataDataAdapter()

Using conn As New TeradataConnection("User=Admin;Password=test123;Database=Northwind;DataSource=127.0.0.1")
  conn.Open()
  adapter.DeleteCommand = conn.CreateCommand()
  adapter.DeleteCommand.CommandText = "DELETE FROM \"CData\".\"dbo\".NorthwindProducts WHERE ProductId=@ProductId"
  adapter.DeleteCommand.Parameters.Add("@ProductId", "ProductId")
  adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None 
  adapter.UpdateBatchSize = 2
  adpater.Update(table)
End Using