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

Using the QuickBooksPOSDataAdapter

Use the adapter's Fill method to retrieve data from the data source. An empty DataTable instance is passed as an argument to the Fill method. When the method returns, the DataTable instance is populated with the queried data. Note that the QuickBooksPOSDataAdapter is slower than the QuickBooksPOSDataReader because the Fill method needs to retrieve all data from the data source before returning.

The following example selects the ListId and LastName columns of the Customers table:

C#

string connectionString = "user=myuseraccount;password=mypassword;URL=http://localhost:2080;qbxmlversion=3.0;";

using (QuickBooksPOSConnection connection = new QuickBooksPOSConnection(connectionString)) {
  QuickBooksPOSDataAdapter dataAdapter = new QuickBooksPOSDataAdapter(
  "SELECT ListId, LastName FROM Customers", connection);

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

  Console.WriteLine("Contents of Customers.");

  foreach (DataRow row in table.Rows) {
    Console.WriteLine("{0}: {1}", row["ListId"], row["LastName"]);
  }
}

VB.NET

Dim connectionString As String = "user=myuseraccount;password=mypassword;URL=http://localhost:2080;qbxmlversion=3.0;"

Using connection As New QuickBooksPOSConnection(connectionString)
  Dim dataAdapter As New QuickBooksPOSDataAdapter("SELECT ListId, LastName FROM Customers", connection)

  Dim table As New DataTable()
  dataAdapter.Fill(table)

  Console.WriteLine("Contents of Customers.")

  For Each row As DataRow In table.Rows
    Console.WriteLine("{0}: {1}", row("ListId"), row("LastName"))
  Next
End Using