Enum diesel::result::DatabaseErrorKind

#[non_exhaustive]
pub enum DatabaseErrorKind {
    UniqueViolation,
    ForeignKeyViolation,
    UnableToSendCommand,
    SerializationFailure,
    ReadOnlyTransaction,
    NotNullViolation,
    CheckViolation,
    ClosedConnection,
}

The kind of database error that occurred.

This is not meant to exhaustively cover all possible errors, but is used to identify errors which are commonly recovered from programmatically. This enum is not intended to be exhaustively matched, and new variants may be added in the future without a major version bump.

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 constraint was violated.

ForeignKeyViolation

A foreign key constraint was violated.

UnableToSendCommand

The query could not be sent to the database due to a protocol violation.

An example of a case where this would occur is if you attempted to send a query with more than 65000 bind parameters using PostgreSQL.

SerializationFailure

A serializable transaction failed to commit due to a read/write dependency on a concurrent transaction.

Corresponds to SQLSTATE code 40001

This error is only detected for PostgreSQL, as we do not yet support transaction isolation levels for other backends.

ReadOnlyTransaction

The command could not be completed because the transaction was read only.

This error will also be returned for SELECT statements which attempted to lock the rows.

NotNullViolation

A not null constraint was violated.

CheckViolation

A check constraint was violated.

ClosedConnection

The connection to the server was unexpectedly closed.

This error is only detected for PostgreSQL and is emitted on a best-effort basis and may be missed.

Trait Implementations

impl Clone for DatabaseErrorKind

fn clone(&self) -> DatabaseErrorKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for DatabaseErrorKind

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

Formats the value using the given formatter.

impl Copy for DatabaseErrorKind