Rust

Update CSV File

See more CSV Examples

Demonstrates how to read a CSV, update some cells, and save.

The Chilkat CSV library/component/class is freeware. The downloads for .NET, C++, Perl, Java, Ruby, and Python contain all of the Chilkat classes, some of which are freeware and some of which require licensing.

Rust

// This example program loads a file (sample.csv)
// that contains this content:
// 
// year,color,country,food
// 2001,red,France,cheese
// 2005,blue,"United States",hamburger
// 2008,green,Italy,pasta
// 1998,orange,Japan,sushi
// 
// The first row contains the column names.
// This file is available at:
// http://www.chilkatsoft.com/testData/sample.csv

let csv = chilkat::Csv::new();

// Prior to loading the CSV file, indicate that the 1st row
// should be treated as column names:
csv.set_has_column_names(true);

// Load the CSV records from the file:

if csv.load_file("sample.csv").is_err() {
    println!("{}", csv.last_error_text());
    return;
}

// Change "cheese" to "baguette"
// ("cheese" is at row=0, column=3
let _ = csv.set_cell(0, 3, "baguette").is_ok();

// Change "blue" to "magenta"
let _ = csv.set_cell(1, 1, "magenta").is_ok();

// Write the updated CSV to a string and display:
let csv_doc = csv.save_to_string().unwrap_or_default();
println!("{}", csv_doc);

// Save the CSV to a file:
if csv.save_file("out.csv").is_err() {
    println!("{}", csv.last_error_text());
}