in cloud-spanner-r2dbc-samples/cloud-spanner-r2dbc-sample/src/main/java/com/example/BookExampleApp.java [52:62]
public BookExampleApp(String sampleInstance, String sampleDatabase,
String sampleProjectId) {
this.connectionFactory = ConnectionFactories.get(ConnectionFactoryOptions.builder()
.option(Option.valueOf("project"), sampleProjectId)
.option(DRIVER, DRIVER_NAME)
.option(INSTANCE, sampleInstance)
.option(DATABASE, sampleDatabase)
.build());
this.connection = Mono.from(this.connectionFactory.create()).block();
}