func helloWorldFromPostgreSQL(projectId, instanceId, databaseId string) error {
	ctx := context.Background()
	db, err := sql.Open("spanner", fmt.Sprintf("projects/%s/instances/%s/databases/%s", projectId, instanceId, databaseId))
	if err != nil {
		return fmt.Errorf("failed to open database connection: %v", err)
	}
	defer db.Close()

	err = spannerdriver.RunTransaction(
		ctx,
		db,
		&sql.TxOptions{ReadOnly: true},
		func(ctx context.Context, tx *sql.Tx) error {
			rows, err := tx.QueryContext(ctx, "SELECT $1::varchar as message", "Hello World from Spanner PostgreSQL")
			if err != nil {
				return fmt.Errorf("failed to execute query: %v", err)
			}
			defer rows.Close()

			var msg string
			for rows.Next() {
				if err := rows.Scan(&msg); err != nil {
					return fmt.Errorf("failed to scan row values: %v", err)
				}
				fmt.Printf("%s\n", msg)
			}
			if err := rows.Err(); err != nil {
				return fmt.Errorf("failed to execute query: %v", err)
			}
			return nil
		},
	)
	if err != nil {
		return fmt.Errorf("transaction failed: %v", err)
	}
	return nil
}