commit	da485dfc79cc1ea0eb2bb4a9008a6cd535efc4d5	[log] [tgz]
author	Wei Li <[email protected]>	Thu Aug 01 05:42:12 2024 +0000
committer	Automerger Merge Worker <[email protected]>	Thu Aug 01 05:42:12 2024 +0000
tree	0b6bcc34bfc75acef8b0769b2043dd6fe05aa9a5
parent	f06c6fe4c98b88b73ed043b1cf35192230ac7b15 [diff]
parent	e00a8b118af958f1a9851aef7a5e261082cb9c00 [diff]

tree: 0b6bcc34bfc75acef8b0769b2043dd6fe05aa9a5

README.md

csv

A fast and flexible CSV reader and writer for Rust, with support for Serde.

Dual-licensed under MIT or the UNLICENSE.

Documentation

https://docs.rs/csv

If you're new to Rust, the tutorial is a good place to start.

Usage

To bring this crate into your repository, either add csv to your Cargo.toml, or run cargo add csv.

Example

This example shows how to read CSV data from stdin and print each record to stdout.

There are more examples in the cookbook.

use std::{error::Error, io, process};

fn example() -> Result<(), Box<dyn Error>> {
    // Build the CSV reader and iterate over each record.
    let mut rdr = csv::Reader::from_reader(io::stdin());
    for result in rdr.records() {
        // The iterator yields Result<StringRecord, Error>, so we check the
        // error here.
        let record = result?;
        println!("{:?}", record);
    }
    Ok(())
}

fn main() {
    if let Err(err) = example() {
        println!("error running example: {}", err);
        process::exit(1);
    }
}

The above example can be run like so:

$ git clone git://github.com/BurntSushi/rust-csv
$ cd rust-csv
$ cargo run --example cookbook-read-basic < examples/data/smallpop.csv

Example with Serde

This example shows how to read CSV data from stdin into your own custom struct. By default, the member names of the struct are matched with the values in the header record of your CSV data.

use std::{error::Error, io, process};

#[derive(Debug, serde::Deserialize)]
struct Record {
    city: String,
    region: String,
    country: String,
    population: Option<u64>,
}

fn example() -> Result<(), Box<dyn Error>> {
    let mut rdr = csv::Reader::from_reader(io::stdin());
    for result in rdr.deserialize() {
        // Notice that we need to provide a type hint for automatic
        // deserialization.
        let record: Record = result?;
        println!("{:?}", record);
    }
    Ok(())
}

fn main() {
    if let Err(err) = example() {
        println!("error running example: {}", err);
        process::exit(1);
    }
}

The above example can be run like so:

$ git clone git://github.com/BurntSushi/rust-csv
$ cd rust-csv
$ cargo run --example cookbook-read-serde < examples/data/smallpop.csv