Rust: PostgreSQL のデータを読む (Read)

Cargo.toml

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

[dependencies]
postgres = "*"

src/main.rs

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

					Jul/24/2020
*/
// --------------------------------------------------------------------
use postgres::{Client, NoTls, Error};

// --------------------------------------------------------------------
fn main() -> Result<(), Error> {
	eprintln!("*** start ***");
	let mut client = Client::connect("postgresql://scott:tiger123@localhost/city", NoTls)?;

	for row in client.query("SELECT id,name,population,date_mod FROM cities", &[])? {
		let id:String = row.get(0);
		let name:String = row.get(1);
		let population:i32 = row.get(2);
		let date_mod:String = row.get(3);
		println!("{}\t{}\t{}\t{}",id,name,population,date_mod);
	};	

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

}

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

実行コマンド

cargo run