[package]
name = "handle-csv"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
csv = "1.2.2"
serde = { version = "1.0", features = ["derive"] }
use std::error::Error;
use std::fs::File;
#[derive(Debug, serde::Deserialize)]
struct Record {
#[serde(rename = "Planet name")]
name: String,
#[serde(rename = "Distance (AU)")]
distance: f32,
#[serde(rename = "Mass")]
mass: f32,
}
fn main() {
let filepath = "planets.csv";
let result = read_file(filepath);
match result {
Ok(rows) => {
for row in &rows {
println!("{:?}", row);
}
println!("---");
println!("{}", rows[3].name);
println!("{}", rows[3].distance);
println!("{}", rows[3].mass);
}
Err(err) => panic!("Error: {}", err),
}
}
fn read_file(filepath: &str) -> Result<Vec<Record>, Box<dyn Error>> {
let mut records: Vec<Record> = vec![];
match File::open(filepath) {
Ok(file) => {
let mut rdr = csv::Reader::from_reader(file);
for result in rdr.deserialize() {
let record: Record = result?;
records.push(record);
}
}
Err(error) => panic!("Error opening file {}: {}", filepath, error),
}
Ok(records)
}
Record { name: "Mercury", distance: 0.4, mass: 0.055 }
Record { name: "Venus", distance: 0.7, mass: 0.815 }
Record { name: "Earth", distance: 1.0, mass: 1.0 }
Record { name: "Mars", distance: 1.5, mass: 0.107 }
Record { name: "Ceres", distance: 2.77, mass: 0.00015 }
Record { name: "Jupiter", distance: 5.2, mass: 318.0 }
Record { name: "Saturn", distance: 9.5, mass: 95.0 }
Record { name: "Uranus", distance: 19.6, mass: 14.0 }
Record { name: "Neptune", distance: 30.0, mass: 17.0 }
Record { name: "Pluto", distance: 39.0, mass: 0.00218 }
Record { name: "Charon", distance: 39.0, mass: 0.000254 }
---
Mars
1.5
0.107