Connect to Google Spanner Data from PowerBuilder via ADO.NET

This article demonstrates using the CData ADO.NET Provider for Google Spanner in PowerBuilder, showcasing the ease of use and compatibility of these standards-based controls across various platforms and development technologies that support Microsoft .NET, including Appeon PowerBuilder.

This article shows how to create a basic PowerBuilder application that uses the CData ADO.NET Provider for Google Spanner to perform reads and writes.

1. In a new WPF Window Application solution, add all the Visual Controls needed for the connection properties. Below is a typical connection string:

   ProjectId='project1';InstanceId='instance1';Database='db1';InitiateOAuth=GETANDREFRESH;

   Google Spanner uses the OAuth authentication standard. To authenticate using OAuth, you can use the embedded credentials or register an app with Google.

   See the Getting Started guide in the CData driver documentation for more information.

2. Add the DataGrid control from the .NET controls.
3. Configure the columns of the DataGrid control. Below are several columns from the Account table:

   <DataGrid AutoGenerateColumns="False" Margin="13,249,12,14" Name="datagrid1" TabIndex="70" ItemsSource="{Binding}">
   <DataGrid.Columns>
    <DataGridTextColumn x:Name="idColumn" Binding="{Binding Path=Id}" Header="Id" Width="SizeToHeader" />
    <DataGridTextColumn x:Name="nameColumn" Binding="{Binding Path=Name}" Header="Name" Width="SizeToHeader" />
   		...
   	</DataGrid.Columns>
   </DataGrid>
   

4. Add a reference to the CData ADO.NET Provider for Google Spanner assembly.

Connect the DataGrid

Once the visual elements have been configured, you can use standard ADO.NET objects like Connection, Command, and DataAdapter to populate a DataTable with the results of an SQL query:

System.Data.CData.GoogleSpanner.GoogleSpannerConnection conn 
conn = create System.Data.CData.GoogleSpanner.GoogleSpannerConnection(connectionString)

System.Data.CData.GoogleSpanner.GoogleSpannerCommand comm 
comm = create System.Data.CData.GoogleSpanner.GoogleSpannerCommand(command, conn)

System.Data.DataTable table
table = create System.Data.DataTable

System.Data.CData.GoogleSpanner.GoogleSpannerDataAdapter dataAdapter
dataAdapter = create System.Data.CData.GoogleSpanner.GoogleSpannerDataAdapter(comm)
dataAdapter.Fill(table)	
datagrid1.ItemsSource=table.DefaultView

The code above can be used to bind data from the specified query to the DataGrid.