Enum BackendMessage 

pub enum BackendMessage {
    RowDescription(RowDescription),
    Authentication(Authentication),
    ParseComplete,
    BindComplete,
    CloseComplete,
    CommandComplete(Bytes),
    CopyData(Bytes),
    CopyDone,
    CopyInResponse(CopyResponse),
    CopyOutResponse(CopyResponse),
    CopyBothResponse(CopyResponse),
    DataRow(DataRow),
    EmptyQueryResponse,
    ErrorResponse(DiagnosticResponse),
    NoData,
    ParameterStatus {
        name: Bytes,
        value: Bytes,
    },
    NoticeResponse(DiagnosticResponse),
    NotificationResponse {
        process_id: u32,
        channel: Bytes,
        payload: Bytes,
    },
    BackendKeyData {
        process_id: u32,
        secret_key: Bytes,
    },
    ReadyForQuery(TransactionStatus),
    ParameterDescription(Vec<u32>),
    PortalSuspended,
    FunctionCallResponse(Bytes),
    NegotiateProtocolVersion(NegotiateProtocolVersion),
}

Messages sent by a PostgreSQL backend.

Variants

RowDescription(RowDescription)

Describes the columns of a result set.

Authentication(Authentication)

Requests, continues, or completes authentication.

ParseComplete

Confirms Parse completion.

BindComplete

Confirms Bind completion.

CloseComplete

Confirms Close completion.

CommandComplete(Bytes)

Reports a completed SQL command tag.

CopyData(Bytes)

Carries COPY or replication data.

CopyDone

Signals completion of backend COPY output.

CopyInResponse(CopyResponse)

Enters COPY IN mode.

CopyOutResponse(CopyResponse)

Enters COPY OUT mode.

CopyBothResponse(CopyResponse)

Enters bidirectional COPY mode.

DataRow(DataRow)

Carries one result row.

EmptyQueryResponse

Reports an empty simple-query string.

ErrorResponse(DiagnosticResponse)

Reports an error with structured diagnostics.

NoData

Reports that a described statement or portal has no row metadata.

ParameterStatus

Reports a runtime parameter value.

Fields

name: Bytes

Parameter name.

value: Bytes

Current parameter value.

NoticeResponse(DiagnosticResponse)

Reports a non-fatal notice.

NotificationResponse

Delivers an asynchronous LISTEN/NOTIFY notification.

Fields

process_id: u32

Process ID of the notifying backend.

channel: Bytes

Notification channel.

payload: Bytes

Notification payload.

BackendKeyData

Supplies the backend cancellation key.

Fields

process_id: u32

Backend process ID.

secret_key: Bytes

Backend secret cancellation key.

ReadyForQuery(TransactionStatus)

Marks an idle command boundary and reports transaction state.

ParameterDescription(Vec<u32>)

Reports inferred or declared prepared-statement parameter OIDs.

PortalSuspended

Reports that an execution stopped at its row limit and may resume.

FunctionCallResponse(Bytes)

Returns the legacy function-call result bytes.

NegotiateProtocolVersion(NegotiateProtocolVersion)

Negotiates protocol version and unsupported startup options.

Implementations

impl BackendMessage

pub fn to_frame(&self) -> Result<Frame>

Reconstructs a backend frame after inspection or modification.

Errors

Returns an error when a structured message contains invalid values.

Trait Implementations

impl Clone for BackendMessage

fn clone(&self) -> BackendMessage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BackendMessage

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

Formats the value using the given formatter.

impl Eq for BackendMessage

impl PartialEq for BackendMessage

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BackendMessage