Enum UpdateField 

pub enum UpdateField<T> {
    Unchanged,
    Set(T),
}

Represents a field in a partial update operation.

• Unchanged: field is not included in the SET clause
• Set(T): field is set to the given value (use Set(None) for nullable columns to set NULL)

Variants

Unchanged

Set(T)

Implementations

impl<T> UpdateField<T>

pub fn is_set(&self) -> bool

pub fn is_unchanged(&self) -> bool

Trait Implementations

impl<T: Clone> Clone for UpdateField<T>

fn clone(&self) -> UpdateField<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for UpdateField<T>

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

Formats the value using the given formatter.

impl<T> Default for UpdateField<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T: PartialEq> PartialEq for UpdateField<T>

fn eq(&self, other: &UpdateField<T>) -> 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<T: ToSqlParam + 'static> ToSqlParam for UpdateField<T>

fn as_any(&self) -> &(dyn Any + Send + Sync)

Convert this value into a format the database driver can accept. The returned Any should be downcastable to the backend’s native param type.

impl<T> StructuralPartialEq for UpdateField<T>