ADO.NET Provider for Greenplum

Build 21.0.7930

Updating the Data

Use the adapter's Update method to update the data. This overloaded method can take a DataTable as a parameter and will commit all the changes made to the data source. The name of the data table can be passed as an argument and can also be used to update the entire dataset in a more traditional manner. When using a data table as an argument to the Update method, the adapter evaluates the changes that have been made to the data table and executes the appropriate command for each row (INSERT, UPDATE, or DELETE).

The example below updates the ShipCity of one of the "template1"."public".Orders entries.

C#

using (GreenplumConnection connection = new GreenplumConnection(connectionString)) {
  GreenplumDataAdapter dataAdapter = new GreenplumDataAdapter(
    "SELECT ShipName, ShipCity FROM \"template1\".\"public\".Orders", connection);

  dataAdapter.UpdateCommand = new GreenplumCommand(
    "UPDATE \"template1\".\"public\".Orders SET ShipCity = @ShipCity " +
    "WHERE Id = @Id", connection);
 
  dataAdapter.UpdateCommand.Parameters.Add(new GreenplumParameter("@ShipCity", DbType.String, "ShipCity"));
  dataAdapter.UpdateCommand.Parameters.Add(new GreenplumParameter("@Id", DbType.String, "Id"));
  dataAdapter.UpdateCommand.Parameters[1].SourceVersion = DataRowVersion.Original;

  DataTable table = new DataTable();
  dataAdapter.Fill(table);

  DataRow firstrow = table.Rows[0];
  firstrow["ShipCity"] = "Raleigh";

  dataAdapter.Update(table);

  Console.WriteLine("Rows after update.");
  
  foreach (DataRow row in table.Rows) {
    Console.WriteLine("{0}: {1}", row["ShipName"], row["ShipCity"]);
  }
}

VB.NET

Using connection As New GreenplumConnection(connectionString)
  Dim dataAdapter As New GreenplumDataAdapter(
    "SELECT ShipName, ShipCity FROM \"template1\".\"public\".Orders", connection)
  
  dataAdapter.UpdateCommand = New GreenplumCommand(
    "UPDATE \"template1\".\"public\".Orders SET ShipCity = @ShipCity " +
    "WHERE Id = @Id", connection)
  
  dataAdapter.UpdateCommand.Parameters.Add(new GreenplumParameter("@ShipCity", DbType.String, "ShipCity"))
  dataAdapter.UpdateCommand.Parameters.Add(new GreenplumParameter("@Id", DbType.String, "Id"))
  dataAdapter.UpdateCommand.Parameters(1).SourceVersion = DataRowVersion.Original
  
  Dim table As New DataTable()
  dataAdapter.Fill(table)
  
  Dim firstrow As DataRow = table.Rows(0)
  firstrow("ShipCity") = "Raleigh"
  
  dataAdapter.Update(table)
  
  Console.WriteLine("Rows after update.")
  
  For Each row As DataRow In table.Rows
    Console.WriteLine("{0}: {1}", row("ShipName"), row("ShipCity"))
  Next
End Using

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Build 21.0.7930