Enum Error 

pub enum Error {
    Postgres(Error),
    Pool(PoolError),
    Build(BuildError),
    WireLength(TryFromSliceError),
    Utf8(Utf8Error),
    Json(Error),
    UnknownTypeOid {
        oid: u32,
    },
    Other(Box<dyn Error + Send + Sync>),
}

Variants

Postgres(Error)

Pool(PoolError)

Build(BuildError)

WireLength(TryFromSliceError)

A wire-format buffer was the wrong length for the type being decoded (malformed or truncated data).

Utf8(Utf8Error)

A text/varchar/bpchar field’s bytes weren’t valid UTF-8.

Json(Error)

A jsonb field’s bytes weren’t valid JSON, or a DecodedValue::Object being bound as a jsonb parameter failed to serialize.

UnknownTypeOid

A result column came back with a type OID this decoder has no rule for and that connect-time discovery didn’t classify either. Returned rather than guessed at: the fallback that used to stand in here (decode the raw binary as UTF-8 text) is only correct for text-like types, and silently produced mojibake for everything else.

Fields

oid: u32

Other(Box<dyn Error + Send + Sync>)

Everything else: DSN parse failures, the “cannot bind a composite as a query parameter” case — none of these originate from a real Postgres response, so none of them carry a SQLSTATE.

Implementations

impl Error

pub fn sqlstate(&self) -> Option<&SqlState>

The Postgres SQLSTATE code, when this error is a real response from the server (as opposed to a connection/pool/decode failure, none of which have one) — the single source of truth error mapping at the pyo3 boundary classifies on.

pub fn pg_message(&self) -> String

The message a caller should actually show. tokio_postgres::Error’s own Display only renders a generic category string for a server-side error ("db error" for every DbError-backed failure, regardless of what the server actually said) — the real detail (e.g. duplicate key value violates unique constraint "...") lives one level deeper, in the DbError its source() wraps, so this prefers that when present and falls back to Display otherwise.

pub fn violated_scalar(&self) -> Option<(&str, &str)>

(schema, type name) for the PostgreSQL scalar/domain a CHECK_VIOLATION failed against (Postgres’s SchemaName/ DataTypeName error fields — both populated for a domain check, confirmed live) — Some(("public", "Email")) for a registered custom scalar’s own DOMAIN check; None for an ordinary table-level CHECK (use violated_table instead).

pub fn violated_table(&self) -> Option<(&str, &str)>

(schema, table) a CHECK_VIOLATION’s table-level constraint belongs to, when Postgres reports one (a domain-level check reports violated_datatype instead, not this).

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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<Box<dyn Error + Send + Sync>> for Error

fn from(e: Box<dyn Error + Send + Sync>) -> Self

Converts to this type from the input type.

impl From<BuildError> for Error

fn from(source: BuildError) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<PoolError<Error>> for Error

fn from(source: PoolError) -> Self

Converts to this type from the input type.

impl From<TryFromSliceError> for Error

fn from(source: TryFromSliceError) -> Self

Converts to this type from the input type.

impl From<Utf8Error> for Error

fn from(source: Utf8Error) -> Self

Converts to this type from the input type.