if execErr != nil {
		_ = tx.Rollback()
		log.Fatal(execErr)
	}
	if err := tx.Commit(); err != nil {
		log.Fatal(err)
	}
}

func ExampleConn_ExecContext() {
	// A *DB is a pool of connections. Call Conn to reserve a connection for
	// exclusive use.
	conn, err := db.Conn(ctx)
	if err != nil {
		log.Fatal(err)
	}