Enum RelError 

#[non_exhaustive]
pub enum RelError {
    UniqueViolation {
        constraint: Option<String>,
    },
    ForeignKeyViolation {
        constraint: Option<String>,
    },
    CheckViolation {
        constraint: Option<String>,
    },
    Serialization,
    Deadlock,
    Unavailable(String),
    Unsupported(String),
    Backend(String),
}

Why a relational operation failed, classified so a caller can branch without parsing driver text (Humboldt hand-maps constraint names in at least seven places today). Plain data.

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.

UniqueViolation

A unique or primary-key constraint rejected the statement.

Fields

constraint: Option<String>

The constraint’s name, if the server reports it.

ForeignKeyViolation

A foreign-key constraint rejected the statement.

Fields

constraint: Option<String>

The constraint’s name, if the server reports it.

CheckViolation

A check constraint (or NOT NULL) rejected the statement.

Fields

constraint: Option<String>

The constraint’s name, if the server reports it.

Serialization

The transaction could not be serialised; retrying it may succeed.

Deadlock

The server chose this transaction as a deadlock victim; retrying it may succeed.

Unavailable(String)

The server could not be reached or went away.

Unsupported(String)

The backend cannot do this, and says so rather than approximating.

Backend(String)

Any other failure; the text is the driver’s.

Trait Implementations

impl Clone for RelError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RelError

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

Formats the value using the given formatter.

impl Display for RelError

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

Formats the value using the given formatter.

impl Eq for RelError

impl Error for RelError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<RelError> for Failure

fn from(e: RelError) -> Self

Converts to this type from the input type.

impl PartialEq for RelError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RelError