Struct PreferenceScope 

pub struct PreferenceScope {
    pub resolution: bool,
    pub representation: bool,
    pub missing: bool,
    pub max_affected: bool,
}

Which preferences a given request could honour.

A preference that cannot apply to the request is not reported back, however plainly it was asked for – saying it was applied when it was ignored is worse than saying nothing.

Fields

resolution: bool

Insert, where duplicates can be resolved.

representation: bool

Insert or update, where a missing column can take a default.

missing: bool

Insert or update.

max_affected: bool

Update, delete or a function call.

Implementations

impl PreferenceScope

pub fn read() -> Self

What a read can honour: none of the write-only preferences.

Trait Implementations

impl Clone for PreferenceScope

fn clone(&self) -> PreferenceScope

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PreferenceScope

impl Debug for PreferenceScope

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

Formats the value using the given formatter.

impl Default for PreferenceScope

fn default() -> PreferenceScope

Returns the “default value” for a type.