// concurrent queries
    let uri = "127.0.0.1:7687";
    let user = "neo4j";
    let pass = "neo";
    let graph = Arc::new(Graph::new(&uri, user, pass).await.unwrap());
    for _ in 1..=42 {
        let graph = graph.clone();
        tokio::spawn(async move {
            let mut result = graph.execute(
	       query("MATCH (p:Person {name: $name}) RETURN p").param("name", "Mark")
	    ).await.unwrap();
            while let Ok(Some(row)) = result.next().await {
        	let node: Node = row.get("p").unwrap();
        	let name: String = node.get("name").unwrap();
                println!("{}", name);
            }
        });
    }
    
    //Transactions
    let mut txn = graph.start_txn().await.unwrap();
    txn.run_queries(vec![
        query("CREATE (p:Person {name: 'mark'})"),
        query("CREATE (p:Person {name: 'jake'})"),
        query("CREATE (p:Person {name: 'luke'})"),
    ])
    .await
    .unwrap();
    txn.commit().await.unwrap(); //or txn.rollback().await.unwrap();