Struct tokio_postgres::Connection [−][src]
pub struct Connection<S, T> { /* fields omitted */ }
Expand description
A connection to a PostgreSQL database.
This is one half of what is returned when a new connection is established. It performs the actual IO with the server, and should generally be spawned off onto an executor to run in the background.
Connection
implements Future
, and only resolves when the connection is closed, either because a fatal error has
occurred, or because its associated Client
has dropped and all outstanding work has completed.
Implementations
impl<S, T> Connection<S, T> where
S: AsyncRead + AsyncWrite + Unpin,
T: AsyncRead + AsyncWrite + Unpin,
impl<S, T> Connection<S, T> where
S: AsyncRead + AsyncWrite + Unpin,
T: AsyncRead + AsyncWrite + Unpin,
Returns the value of a runtime parameter for this connection.
pub fn poll_message(
&mut self,
cx: &mut Context<'_>
) -> Poll<Option<Result<AsyncMessage, Error>>>
pub fn poll_message(
&mut self,
cx: &mut Context<'_>
) -> Poll<Option<Result<AsyncMessage, Error>>>
Polls for asynchronous messages from the server.
The server can send notices as well as notifications asynchronously to the client. Applications that wish to
examine those messages should use this method to drive the connection rather than its Future
implementation.
Trait Implementations
impl<S, T> Future for Connection<S, T> where
S: AsyncRead + AsyncWrite + Unpin,
T: AsyncRead + AsyncWrite + Unpin,
impl<S, T> Future for Connection<S, T> where
S: AsyncRead + AsyncWrite + Unpin,
T: AsyncRead + AsyncWrite + Unpin,
Auto Trait Implementations
impl<S, T> !RefUnwindSafe for Connection<S, T>
impl<S, T> Send for Connection<S, T> where
S: Send,
T: Send,
impl<S, T> !Sync for Connection<S, T>
impl<S, T> Unpin for Connection<S, T> where
S: Unpin,
T: Unpin,
impl<S, T> !UnwindSafe for Connection<S, T>
Blanket Implementations
Mutably borrows from an owned value. Read more
Map this future’s output to a different type, returning a new future of the resulting type. Read more
Map this future’s output to a different type, returning a new future of the resulting type. Read more
Chain on a computation for when a future finished, passing the result of
the future to the provided closure f
. Read more
fn left_future<B>(self) -> Either<Self, B> where
B: Future<Output = Self::Output>,
fn left_future<B>(self) -> Either<Self, B> where
B: Future<Output = Self::Output>,
Wrap this future in an Either
future, making it the left-hand variant
of that Either
. Read more
fn right_future<A>(self) -> Either<A, Self> where
A: Future<Output = Self::Output>,
fn right_future<A>(self) -> Either<A, Self> where
A: Future<Output = Self::Output>,
Wrap this future in an Either
future, making it the right-hand variant
of that Either
. Read more
fn into_stream(self) -> IntoStream<Self>
fn into_stream(self) -> IntoStream<Self>
Convert this future into a single element stream. Read more
Flatten the execution of this future when the output of this future is itself another future. Read more
fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream,
fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream,
Flatten the execution of this future when the successful result of this future is a stream. Read more
fn fuse(self) -> Fuse<Self>
fn fuse(self) -> Fuse<Self>
Fuse a future such that poll
will never again be called once it has
completed. This method can be used to turn any Future
into a
FusedFuture
. Read more
Do something with the output of a future before passing it on. Read more
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,
Catches unwinding panics while polling the future. Read more
Create a cloneable handle to this future where all handles will resolve to the same result. Read more
fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)
fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)
Turn this future into a future that yields ()
on completion and sends
its output to another future on a separate task. Read more
Wrap the future in a Box, pinning it. Read more
Wrap the future in a Box, pinning it. Read more
fn unit_error(self) -> UnitError<Self>
fn unit_error(self) -> UnitError<Self>
Turns a Future<Output = T>
into a
TryFuture<Ok = T, Error = ()
>. Read more
fn never_error(self) -> NeverError<Self>
fn never_error(self) -> NeverError<Self>
Turns a Future<Output = T>
into a
TryFuture<Ok = T, Error = Never
>. Read more
fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output> where
Self: Unpin,
fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output> where
Self: Unpin,
A convenience for calling Future::poll
on Unpin
future types.
fn now_or_never(self) -> Option<Self::Output>
fn now_or_never(self) -> Option<Self::Output>
Evaluates and consumes the future, returning the resulting output if
the future is ready after the first call to Future::poll
. Read more
into_future
)The output that the future will produce on completion.
type Future = F
type Future = F
into_future
)Which kind of future are we turning this into?
into_future
)Creates a future from a value.
impl<Fut> TryFutureExt for Fut where
Fut: TryFuture + ?Sized,
impl<Fut> TryFutureExt for Fut where
Fut: TryFuture + ?Sized,
fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where
Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::Error == Self::Error,
fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where
Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::Error == Self::Error,
Flattens the execution of this future when the successful result of this
future is a [Sink
]. Read more
Maps this future’s success value to a different value. Read more
fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E> where
F: FnOnce(Self::Ok) -> T,
E: FnOnce(Self::Error) -> T,
fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E> where
F: FnOnce(Self::Ok) -> T,
E: FnOnce(Self::Error) -> T,
Maps this future’s success value to a different value, and permits for error handling resulting in the same type. Read more
Maps this future’s error value to a different value. Read more
Executes another future after this one resolves successfully. The success value is passed to a closure to create this subsequent future. Read more
Executes another future if this one resolves to an error. The error value is passed to a closure to create this subsequent future. Read more
fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnOnce(&Self::Ok),
fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnOnce(&Self::Ok),
Do something with the success value of a future before passing it on. Read more
fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnOnce(&Self::Error),
fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnOnce(&Self::Error),
Do something with the error value of a future before passing it on. Read more
fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,
fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,
Flatten the execution of this future when the successful result of this future is another future. Read more
fn try_flatten_stream(self) -> TryFlattenStream<Self> where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error == Self::Error,
fn try_flatten_stream(self) -> TryFlattenStream<Self> where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error == Self::Error,
Flatten the execution of this future when the successful result of this future is a stream. Read more