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

PostgreSQLDataAdapter adapter = new PostgreSQLDataAdapter();

using (PostgreSQLConnection conn = new PostgreSQLConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432")) {
  conn.Open();
  adapter.InsertCommand = conn.CreateCommand();
  adapter.InsertCommand.CommandText = "INSERT INTO \"postgres\".\"schema01\".Orders (ShipCity) VALUES (@ShipCity)";
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
  adapter.InsertCommand.Parameters.Add("@ShipCity", "ShipCity");

  DataTable batchDataTable = new DataTable();
  batchDataTable.Columns.Add("ShipCity", typeof(string));
  batchDataTable.Rows.Add("Raleigh");
  batchDataTable.Rows.Add("New York");
  adapter.UpdateBatchSize = 2;
  adapter.Update(batchDataTable);
}

VB.NET

 
Dim adapter As New PostgreSQLDataAdapter()

Using conn As New PostgreSQLConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432")
  conn.Open()
  adapter.InsertCommand = conn.CreateCommand()
  adapter.InsertCommand.CommandText = "INSERT INTO \"postgres\".\"schema01\".Orders (ShipName) VALUES (@ShipCity)"
  adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None
  adapter.InsertCommand.Parameters.Add("@ShipCity", "ShipCity")

  Dim batchDataTable As New DataTable()
  batchDataTable.Columns.Add("ShipCity", GetType(String))
  batchDataTable.Rows.Add("New York")
  batchDataTable.Rows.Add("Raleigh")
  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#

PostgreSQLDataAdapter adapter = new PostgreSQLDataAdapter();

using (PostgreSQLConnection conn = new PostgreSQLConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432")) { 
  conn.Open();
  adapter.UpdateCommand = conn.CreateCommand();
  adapter.UpdateCommand.CommandText = "UPDATE \"postgres\".\"schema01\".Orders SET ShipCity=@ShipCity WHERE Id=@Id";
  adapter.UpdateCommand.Parameters.Add("@ShipCity", "ShipCity");
  adapter.UpdateCommand.Parameters.Add("@Id", "Id");
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None; 
  DataTable batchDataTable = new DataTable();
  batchDataTable.Columns.Add("ShipCity", typeof(string));
  batchDataTable.Rows.Add("Raleigh");
  batchDataTable.Rows.Add("New York");
  adapter.UpdateBatchSize = 2;
  adapter.Update(dataTable);
}

VB.NET

 
Dim adapter As New PostgreSQLDataAdapter()

Using conn As New PostgreSQLConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432")
  conn.Open()
  adapter.UpdateCommand = conn.CreateCommand()
  adapter.UpdateCommand.CommandText = "UPDATE \"postgres\".\"schema01\".Orders SET ShipCity=@ShipCity WHERE Id=@Id"
  adapter.UpdateCommand.Parameters.Add("@ShipCity", "ShipCity")
  adapter.UpdateCommand.Parameters.Add("@Id", "Id")
  adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None
  Dim batchDataTable As New DataTable()
  batchDataTable.Columns.Add("ShipCity", GetType(String))
  batchDataTable.Rows.Add("New York")
  batchDataTable.Rows.Add("Raleigh")
  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#

PostgreSQLDataAdapter adapter = new PostgreSQLDataAdapter();

using (PostgreSQLConnection conn = new PostgreSQLConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432")) {
  conn.Open();
  adapter.DeleteCommand = conn.CreateCommand();
  adapter.DeleteCommand.CommandText = "DELETE FROM \"postgres\".\"schema01\".Orders 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 PostgreSQLDataAdapter()

Using conn As New PostgreSQLConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432")
  conn.Open()
  adapter.DeleteCommand = conn.CreateCommand()
  adapter.DeleteCommand.CommandText = "DELETE FROM \"postgres\".\"schema01\".Orders WHERE Id=@Id"
  adapter.DeleteCommand.Parameters.Add("@Id", "Id")
  adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None 
  adapter.UpdateBatchSize = 2
  adpater.Update(table)
End Using