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

Using the GoogleDataCatalogDataAdapter

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 GoogleDataCatalogDataAdapter is slower than the GoogleDataCatalogDataReader because the Fill method needs to retrieve all data from the data source before returning.

The following example selects the Type and DatasetName columns of the Schemas table:

C#

string connectionString = "InitiateOAuth=GETANDREFRESH;ProjectId=YourProjectId;";

using (GoogleDataCatalogConnection connection = new GoogleDataCatalogConnection(connectionString)) {
  GoogleDataCatalogDataAdapter dataAdapter = new GoogleDataCatalogDataAdapter(
  "SELECT Type, DatasetName FROM Schemas", connection);

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

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

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

VB.NET

Dim connectionString As String = "InitiateOAuth=GETANDREFRESH;ProjectId=YourProjectId;"

Using connection As New GoogleDataCatalogConnection(connectionString)
  Dim dataAdapter As New GoogleDataCatalogDataAdapter("SELECT Type, DatasetName FROM Schemas", connection)

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

  Console.WriteLine("Contents of Schemas.")

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