Rust：删除MongoDB的数据

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


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

// --------------------------------------------------------------------
/*
    mongodb_delete/src/main.rs

                    Jul/26/2020
*/
// --------------------------------------------------------------------
use std::env;
use mongodb::{
    bson::doc,
    error::Result,
    Client
};

#[tokio::main]
async fn main() -> Result<()> {
    eprintln! ("*** 開始 ***");
    let args: Vec<_> = env::args().collect();
    let key_in = &args[1];

    eprintln!("{}",key_in);

    let client =
        Client::with_uri_str("mongodb://localhost:27017").await?;

    let coll = client
        .database("city")
        .collection("saitama");

    let delete_result = coll.delete_many(
        doc! {"key": key_in}, None,
        ).await?;

    println!("Deleted {} documents", delete_result.deleted_count);

    eprintln! ("*** 終了 ***");

    Ok(())
}

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

实施

$ cargo run t1162
    Finished dev [unoptimized + debuginfo] target(s) in 0.29s
     Running `target/debug/mongodb_delete t1162`
*** 開始 ***
t1162
Deleted 1 documents
*** 終了 ***

快速入门：使用Rust和MongoDB启动和运行的参考页面