You can use the SELECT INTO statement to export formatted data to a file.

Data Export with an SQL Query

The following query exports data into a file formatted in comma-separated values (CSV):

SELECT Name, TotalDue INTO [csv://[CData].[GoogleSpanner].Customer.txt] FROM [[CData].[GoogleSpanner].Customer] WHERE CustomerId = '12345'

You can specify other formats in the file URI. The possible delimiters are tab, semicolon, and comma with the default being a comma. The following example exports tab-separated values:

SELECT Name, TotalDue INTO [csv://[CData].[GoogleSpanner].Customer.txt;delimiter=tab] FROM [[CData].[GoogleSpanner].Customer] WHERE CustomerId = '12345'

C#

String connectionString = "ProjectId='project1';InstanceId='instance1';Database='db1';OAuthClientId='757060765381';OauthClientSecret='abc';";

using (GoogleSpannerConnection connection = new GoogleSpannerConnection(connectionString)) {
  GoogleSpannerCommand cmd = new GoogleSpannerCommand("SELECT Name, TotalDue INTO [csv://[CData].[GoogleSpanner].Customer.txt] FROM [[CData].[GoogleSpanner].Customer] WHERE CustomerId = '12345' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "ProjectId='project1';InstanceId='instance1';Database='db1';OAuthClientId='757060765381';OauthClientSecret='abc';" 

Using connection As New GoogleSpannerConnection(connectionString)
  Dim cmd As New GoogleSpannerCommand("SELECT Name, TotalDue INTO [csv://[CData].[GoogleSpanner].Customer.txt] FROM [[CData].[GoogleSpanner].Customer] WHERE CustomerId = '12345'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using

You can specify other file formats in the URI. The following example exports tab-separated values:

C#

String connectionString = "ProjectId='project1';InstanceId='instance1';Database='db1';OAuthClientId='757060765381';OauthClientSecret='abc';";

using (GoogleSpannerConnection connection = new GoogleSpannerConnection(connectionString)) {
  GoogleSpannerCommand cmd = new GoogleSpannerCommand("SELECT * INTO [[CData].[GoogleSpanner].Customer] IN [csv://filename=c:/[CData].[GoogleSpanner].Customer.csv;delimiter=tab] FROM [[CData].[GoogleSpanner].Customer] WHERE CustomerId = '12345'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "ProjectId='project1';InstanceId='instance1';Database='db1';OAuthClientId='757060765381';OauthClientSecret='abc';" 

Using connection As New GoogleSpannerConnection(connectionString)
  Dim cmd As New GoogleSpannerCommand("SELECT * INTO [[CData].[GoogleSpanner].Customer] IN [csv://filename=c:/[CData].[GoogleSpanner].Customer.csv;delimiter=tab] FROM [[CData].[GoogleSpanner].Customer] WHERE CustomerId = '12345'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using