Rust: 读取 MongoDB 的数据 (读取)

我将读取在这里创建的数据。
Rust: 创建 MongoDB 数据

[package]
name = "mongodb_read"
version = "0.1.0"
edition = "2018"


[dependencies]
mongodb = "1.0.0"
tokio = "*"
futures = "*"

// --------------------------------------------------------------------
/*
    mongodb_read/src/main.rs

                    Jul/25/2020
*/
// --------------------------------------------------------------------
use futures::stream::StreamExt;
use mongodb::{
    bson::{doc},
    Client,
    error::Result,
};

#[tokio::main]
async fn main()-> Result<()> {
    let client =
        Client::with_uri_str("mongodb://localhost:27017").await?;
    let database = client.database("city");
    let collection = database.collection("saitama");

    let mut cursor = collection.find(doc! {}, None).await?;

    while let Some(result) = cursor.next().await {
        println!("{:?}",result);
    }

    eprintln! ("*** 終了 ***");
    Ok(())
}

// --------------------------------------------------------------------

执行 (shí

$ cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.15s
     Running `target/debug/mongodb_read`
Ok(Document({"_id": ObjectId(ObjectId(5f1bf38b00c8509a003a3a47)), "key": String("t1161"), "name": String("さいたま"), "population": Int32(45298), "date_mod": String("1956-6-12")}))
Ok(Document({"_id": ObjectId(ObjectId(5f1bf38b0077dbf3003a3a48)), "key": String("t1162"), "name": String("所沢"), "population": Int32(21983), "date_mod": String("1956-8-24")}))
Ok(Document({"_id": ObjectId(ObjectId(5f1bf38b0054d9c9003a3a49)), "key": String("t1163"), "name": String("越谷"), "population": Int32(51287), "date_mod": String("1956-3-9")}))
*** 終了 ***