Rust: sqlite3 のデータを作成 (Create)

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

[package]
name = "sqlite3_create"
version = "0.1.0"
edition = "2018"

[dependencies]
rusqlite = "*"

// --------------------------------------------------------------------
/*
    sqlite3_create/src/main.rs

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


// --------------------------------------------------------------------
fn insert_proc(conn:&Connection,key:&'static str,name:&'static str,population: i32,date_mod:&'static str) -> Result<()> {

    conn.execute(
        "INSERT INTO cities (id,name, population,date_mod) VALUES (?1,?2,$3,$4)",
        params![key.to_string(),name.to_string(),population,date_mod.to_string()],
    )?;

    Ok(())
}

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

    let args: Vec<_> = env::args().collect();
    let file_sqlite3 = &args[1];

    eprintln!("{}",file_sqlite3);

    let conn = Connection::open(file_sqlite3).unwrap();

    conn.execute(
        "drop table cities",
        params![],
    )?;

    conn.execute(
        "CREATE TABLE cities (
              id    VARCHAR(10) PRIMARY KEY,
              name  TEXT NOT NULL,
              population    INTEGER,
              date_mod  VARCHAR(20)
              )",
        params![],
    )?;


    let _ = insert_proc(&conn,"t0711","郡山",38415,"1956-5-15");
    let _ = insert_proc(&conn,"t0712","会津若松",57926,"1956-6-8");
    let _ = insert_proc(&conn,"t0713","白河",98123,"1956-8-17");
    let _ = insert_proc(&conn,"t0714","福島",63259,"1956-1-21");
    let _ = insert_proc(&conn,"t0715","喜多方",21748,"1956-9-12");
    let _ = insert_proc(&conn,"t0716","二本松",51924,"1956-7-5");
    let _ = insert_proc(&conn,"t0717","いわき",97125,"1956-9-12");
    let _ = insert_proc(&conn,"t0718","相馬",63219,"1956-3-22");
    let _ = insert_proc(&conn,"t0719","須賀川",25781,"1956-11-30");

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

    Ok(())
}

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

$ cargo run /var/tmp/sqlite3/cities.db
    Finished dev [unoptimized + debuginfo] target(s) in 0.80s
     Running `target/debug/sqlite3_create /var/tmp/sqlite3/cities.db`
*** start ***
/var/tmp/sqlite3/cities.db
*** end ***