vendor/csv/examples/cookbook-write-serde.rs

   1 use std::{error::Error, io, process};
   2
   3 use serde::Serialize;
   4
   5 #[derive(Debug, Serialize)]
   6 struct Record {
   7     city: String,
   8     region: String,
   9     country: String,
  10     population: Option<u64>,
  11 }
  12
  13 fn example() -> Result<(), Box<dyn Error>> {
  14     let mut wtr = csv::Writer::from_writer(io::stdout());
  15
  16     // When writing records with Serde using structs, the header row is written
  17     // automatically.
  18     wtr.serialize(Record {
  19         city: "Southborough".to_string(),
  20         region: "MA".to_string(),
  21         country: "United States".to_string(),
  22         population: Some(9686),
  23     })?;
  24     wtr.serialize(Record {
  25         city: "Northbridge".to_string(),
  26         region: "MA".to_string(),
  27         country: "United States".to_string(),
  28         population: Some(14061),
  29     })?;
  30     wtr.flush()?;
  31     Ok(())
  32 }
  33
  34 fn main() {
  35     if let Err(err) = example() {
  36         println!("error running example: {}", err);
  37         process::exit(1);
  38     }
  39 }