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ConnectionState

Enum ConnectionState

#[non_exhaustive]pub enum ConnectionState {
    Disconnected,
    Connecting,
    StartingUp,
    Authenticating,
    Idle,
    ActiveSimpleQuery,
    ActiveExtendedQuery,
    CopyIn,
    CopyOut,
    Streaming,
    Closing,
    Closed,
}

Expand description

Internal state of a PostgreSQL connection.

Variants (Non-exhaustive)§

This enum is marked as 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.

Disconnected

Initial state before any network activity.

Connecting

TCP/TLS handshake in progress.

StartingUp

Startup message sent, waiting for Authentication* or ReadyForQuery.

Authenticating

Authentication challenge/response exchange in progress.

Idle

ReadyForQuery received; connection is idle and can accept commands.

ActiveSimpleQuery

A simple query is in flight.

ActiveExtendedQuery

An extended query is in flight.

CopyIn

A COPY IN operation is in progress.

CopyOut

A COPY OUT operation is in progress.

Streaming

A row stream is active and borrowing the connection.

Closing

Connection is being closed gracefully.

Closed

Connection is closed or unusable due to error.

Implementations§

impl ConnectionState

pub fn is_idle(self) -> bool

Returns true if the connection is in a state where queries may be sent.

pub fn is_closed(self) -> bool

Returns true if the connection is fully closed.

Trait Implementations§

impl Clone for ConnectionState

fn clone(&self) -> ConnectionState

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more

impl Debug for ConnectionState

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

Formats the value using the given formatter. Read more

impl PartialEq for ConnectionState

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

Tests for self and other values to be equal, and is used by ==.

1.0.0 (const: unstable) · Source§

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ConnectionState

impl Eq for ConnectionState

impl StructuralPartialEq for ConnectionState

Auto Trait Implementations§

impl Freeze for ConnectionState

impl RefUnwindSafe for ConnectionState

impl Send for ConnectionState

impl Sync for ConnectionState

impl Unpin for ConnectionState

impl UnsafeUnpin for ConnectionState

impl UnwindSafe for ConnectionState

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<'a, T, E> AsTaggedExplicit<'a, E> for T
where T: 'a,

fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

impl<'a, T, E> AsTaggedImplicit<'a, E> for T
where T: 'a,

fn implicit( self, class: Class, constructed: bool, tag: u32, ) -> TaggedParser<'a, Implicit, Self, E>

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> CloneToUninit for T
where T: Clone,

unsafe fn clone_to_uninit(&self, dest: *mut u8)

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

Performs copy-assignment from self to dest. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> Same for T

type Output = T

Should always be Self

impl<T> ToOwned for T
where T: Clone,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more