Enum BackendMessage 

pub enum BackendMessage {
    AuthenticationOk,
    AuthenticationCleartextPassword,
    AuthenticationMd5Password([u8; 4]),
    AuthenticationSasl(Vec<String>),
    AuthenticationSaslContinue(Bytes),
    AuthenticationSaslFinal(Bytes),
    BackendKeyData {
        pid: i32,
        secret_key: i32,
    },
    ParameterStatus {
        name: String,
        value: String,
    },
    ReadyForQuery(u8),
    RowDescription(Vec<FieldDescription>),
    ParameterDescription(Vec<Oid>),
    DataRow(Bytes),
    CommandComplete(Bytes),
    ParseComplete,
    BindComplete,
    CloseComplete,
    NoData,
    PortalSuspended,
    EmptyQueryResponse,
    ErrorResponse(DbError),
    NoticeResponse(DbError),
    NotificationResponse {
        pid: i32,
        channel: String,
        payload: String,
    },
    CopyInResponse {
        format: u8,
        column_formats: Vec<i16>,
    },
    CopyOutResponse {
        format: u8,
        column_formats: Vec<i16>,
    },
    CopyData(Bytes),
    CopyDone,
    NegotiateProtocolVersion {
        newest_minor: i32,
        unsupported: Vec<String>,
    },
}

A decoded backend message.

Variants

AuthenticationOk

Authentication succeeded.

AuthenticationCleartextPassword

Server requests a cleartext password.

AuthenticationMd5Password([u8; 4])

Server requests an MD5 password, with a 4-byte salt.

AuthenticationSasl(Vec<String>)

Server offers SASL mechanisms.

AuthenticationSaslContinue(Bytes)

SASL challenge.

AuthenticationSaslFinal(Bytes)

SASL completion.

BackendKeyData

Backend process id and secret key, for query cancellation.

Fields

pid: i32

Backend process ID.

secret_key: i32

Cancellation secret key.

ParameterStatus

A run-time parameter (e.g. server_version, integer_datetimes).

Fields

name: String

Parameter name.

value: String

Parameter value.

ReadyForQuery(u8)

The connection is ready for a new query.

RowDescription(Vec<FieldDescription>)

Description of the columns a statement or portal will return.

ParameterDescription(Vec<Oid>)

The parameter types a prepared statement expects.

DataRow(Bytes)

One result row; the payload starts with the column count.

CommandComplete(Bytes)

A statement completed, with its command tag.

ParseComplete

A Parse completed.

BindComplete

A Bind completed.

CloseComplete

A Close completed.

NoData

The statement/portal returns no rows.

PortalSuspended

A portal was suspended by the row limit.

EmptyQueryResponse

An empty query string produced no command.

ErrorResponse(DbError)

The server reported an error for the current request.

NoticeResponse(DbError)

A non-fatal notice, to be logged.

NotificationResponse

An asynchronous NOTIFY.

Fields

pid: i32

Notifying backend process ID.

channel: String

Channel name.

payload: String

Notification payload.

CopyInResponse

The server is ready to receive COPY ... FROM STDIN data.

Fields

format: u8

Overall format (0 text, 1 binary).

column_formats: Vec<i16>

Per-column formats.

CopyOutResponse

The server will stream COPY ... TO STDOUT data.

Fields

format: u8

Overall format (0 text, 1 binary).

column_formats: Vec<i16>

Per-column formats.

CopyData(Bytes)

A chunk of COPY data.

CopyDone

The server finished streaming COPY data.

NegotiateProtocolVersion

The server advertises protocol version negotiation.

Fields

newest_minor: i32

Newest supported minor protocol version.

unsupported: Vec<String>

Unrecognized startup options.

Trait Implementations

impl Debug for BackendMessage

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

Formats the value using the given formatter.