Cargo.toml

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


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

src/main.rs

// --------------------------------------------------------------------
/*
	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(())
}
 
// --------------------------------------------------------------------

実行

$ 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 ***

参考ページ
Quick Start: Up and Running with Rust and MongoDB