Enum DataErrorKind 

#[non_exhaustive]
pub enum DataErrorKind {
    Config,
    Connection,
    Query,
    Timeout,
    Conflict,
    Other,
}

Failure classes. #[non_exhaustive]: match with a _ arm.

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.

Config

Misconfiguration (missing driver feature, bad URL): permanent until a human intervenes.

Connection

Connection/pool failure: retryable — another replica or a later attempt may succeed.

Query

The statement itself failed (syntax, constraint, type): permanent.

Timeout

The operation timed out: retryable.

Conflict

Optimistic/duplicate conflict (unique violation, version clash): permanent for this payload, but semantically distinct from Query so idempotent upsert paths can branch on it.

Other

Unclassified (driver returned something we don’t recognise).

Trait Implementations

impl Clone for DataErrorKind

fn clone(&self) -> DataErrorKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DataErrorKind

impl Debug for DataErrorKind

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

Formats the value using the given formatter.

impl Eq for DataErrorKind

impl PartialEq for DataErrorKind

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for DataErrorKind