Enum Nullability

pub enum Nullability {
    Unknown,
    Nullable,
    NoNulls,
}

Indication of whether a column is nullable or not.

Variants

Unknown

Indicates that we do not know whether the column is Nullable or not.

Nullable

The column may hold NULL values.

NoNulls

The column can not hold NULL values.

Implementations

impl Nullability

pub fn new(nullability: Nullability) -> Self

Construct a new instance from a Nullability new type constant.

use odbc_api::Nullability;

assert_eq!(Nullability::Unknown, Nullability::new(odbc_sys::Nullability::UNKNOWN));
assert_eq!(Nullability::NoNulls, Nullability::new(odbc_sys::Nullability::NO_NULLS));
assert_eq!(Nullability::Nullable, Nullability::new(odbc_sys::Nullability::NULLABLE));

Trait Implementations

impl Clone for Nullability

fn clone(&self) -> Nullability

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Nullability

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

Formats the value using the given formatter.

impl Default for Nullability

fn default() -> Nullability

Returns the “default value” for a type.

impl Hash for Nullability

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Nullability

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Nullability

impl Eq for Nullability

impl StructuralPartialEq for Nullability