use std::thread;use r2d2_postgres::{postgres::NoTls,PostgresConnectionManager};fnmain(){let manager = PostgresConnectionManager::new("host=localhost user=postgres".parse().unwrap(),NoTls,);let pool = r2d2::Pool::new(manager).unwrap();for i in0..10i32{let pool = pool.clone(); thread::spawn(move || {letmut client = pool.get().unwrap(); client.execute("INSERT INTO foo (bar) VALUES ($1)",&[&i]).unwrap();});}}