Rust: rusqlite の使い方

こちらのサンプルを改造してみました。
Crate rusqlite

フォルダー構造

$ tree -L 2
.
├── Cargo.lock
├── Cargo.toml
├── src
│   └── main.rs
└── target
    └── debug

Cargo.toml

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

[dependencies]
rusqlite = "*"

src/main.rs

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

					Jul/23/2020
*/
// --------------------------------------------------------------------
use rusqlite::{params, Connection, Result};

#[derive(Debug)]
struct City {
	id: String,
	name: String,
	population: i32,
}

fn main() -> Result<()> {
	eprintln! ("*** start ***");

	let conn = Connection::open_in_memory()?;


	conn.execute(
		"CREATE TABLE person (
				  id			  VARCHAR(10) PRIMARY KEY,
				  name			TEXT NOT NULL,
				  population	  INTEGER
				  )",
		params![],
	)?;


	conn.execute(
		"INSERT INTO person (id,name, population) VALUES (?1, ?2, $3)",
		params!["t0711".to_string(),"郡山".to_string(), 18954],
	)?;

	conn.execute(
		"INSERT INTO person (id, name, population) VALUES (?1, ?2, $3)",
		params!["t0712".to_string(),"会津若松".to_string(), 83576],
	)?;

	conn.execute(
		"INSERT INTO person (id, name, population) VALUES (?1, ?2, $3)",
		params!["t0713".to_string(),"白河".to_string(), 51769],
	)?;

	let mut stmt = conn.prepare("SELECT id, name, population FROM person")?;
	let city_iter = stmt.query_map(params![], |row| {
		Ok(City {
			id: row.get(0)?,
			name: row.get(1)?,
			population: row.get(2)?,
		})
	})?;

	for city in city_iter {
		println!("{:?}", city.unwrap());
	}

	eprintln! ("*** end ***");

	Ok(())
}

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

実行結果

$ cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
     Running `target/debug/sqlite_read`
*** start ***
City { id: "t0711", name: "郡山", population: 18954 }
City { id: "t0712", name: "会津若松", population: 83576 }
City { id: "t0713", name: "白河", population: 51769 }
*** end ***