The CData ADO.NET Provider for Acumatica implements two ADO.NET interfaces you can use to retrieve data from Acumatica: AcumaticaDataAdapter and AcumaticaDataReader objects. Whereas AcumaticaDataAdapter objects retrieve a single result set of all the data that matches a query, AcumaticaDataReader objects fetch data in subset increments as needed.

Using the AcumaticaDataReader

The AcumaticaDataReader retrieves data faster than the AcumaticaDataAdapter because it can retrieve data in pages. As you read data from the AcumaticaDataReader, it periodically requests the next page of results from the data source, if required. This causes results to be returned at a faster rate. The following example selects all the columns from the Events table:

C#

string connectionString = "Url = https://try.acumatica.com/ISV/entity/Default/17.200.001/;User=user;Password=password;Company=CompanyName;";

using (AcumaticaConnection connection = new AcumaticaConnection(connectionString)) {
  AcumaticaCommand cmd = new AcumaticaCommand("SELECT * FROM Events", connection);
  
  AcumaticaDataReader rdr = cmd.ExecuteReader();

  while (rdr.Read()) {
    Console.WriteLine(String.Format("\t{0} --> \t\t{1}", rdr["Id"], rdr["location_displayName"]));
  }
}

VB.NET

Dim connectionString As String = "Url = https://try.acumatica.com/ISV/entity/Default/17.200.001/;User=user;Password=password;Company=CompanyName;"

Using connection As New AcumaticaConnection(connectionString)
  Dim cmd As New AcumaticaCommand("SELECT * FROM Events", connection)

  Dim rdr As AcumaticaDataReader = cmd.ExecuteReader()

  While rdr.Read()
    Console.WriteLine([String].Format(vbTab & "{0} --> " & vbTab & vbTab & "{1}", rdr("Id"), rdr("location_displayName")))
  End While
End Using