Enum Nulls 

#[non_exhaustive]
pub enum Nulls {
    None,
    Empty,
    Text(&'static str),
}

Which fields are null.

Only unquoted fields are null, which allows writing the empty string (or the text of null) in quotes.

use deser_csv::{DeserializerConfig, Headers, Nulls};

let mut config = DeserializerConfig::builder().headers(Headers::None).build();
let rows: Vec<Vec<Option<String>>> = config.from_str(",\"\"\n").unwrap();
assert_eq!(rows, [[Some("".to_string()), Some("".to_string())]]);

config.set_nulls(Nulls::Empty);
let rows: Vec<Vec<Option<String>>> = config.from_str(",\"\"\n").unwrap();
assert_eq!(rows, [[None, Some("".to_string())]]);

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

None

No field is null. Empty fields are still None for optionals of types that do not accept the empty string.

Empty

Empty fields are null (like PostgreSQL’s CSV format).

Text(&'static str)

Fields with this text are null (like \N or NULL).

Trait Implementations

impl Clone for Nulls

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Nulls

impl Debug for Nulls

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Nulls

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Nulls

impl PartialEq for Nulls

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Nulls