[−][src]Struct tokio_postgres::Connection
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.
Methods
impl<S, T> Connection<S, T> where
S: AsyncRead + AsyncWrite,
T: AsyncRead + AsyncWrite,
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S: AsyncRead + AsyncWrite,
T: AsyncRead + AsyncWrite,
pub fn parameter(&self, name: &str) -> Option<&str>
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Returns the value of a runtime parameter for this connection.
pub fn poll_message(&mut self) -> Poll<Option<AsyncMessage>, Error>
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Polls for asynchronous messages from the server.
The server can send notices as well as notifications asynchronously to the client. Applications which 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,
T: AsyncRead + AsyncWrite,
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S: AsyncRead + AsyncWrite,
T: AsyncRead + AsyncWrite,
type Item = ()
The type of value that this future will resolved with if it is successful. Read more
type Error = Error
The type of error that this future will resolve with if it fails in a normal fashion. Read more
fn poll(&mut self) -> Poll<(), Error>
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fn wait(self) -> Result<Self::Item, Self::Error>
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Block the current thread until this future is resolved. Read more
fn map<F, U>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Item) -> U,
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F: FnOnce(Self::Item) -> U,
Map this future's result to a different type, returning a new future of the resulting type. Read more
fn map_err<F, E>(self, f: F) -> MapErr<Self, F> where
F: FnOnce(Self::Error) -> E,
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F: FnOnce(Self::Error) -> E,
Map this future's error to a different error, returning a new future. Read more
fn from_err<E>(self) -> FromErr<Self, E> where
E: From<Self::Error>,
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E: From<Self::Error>,
Map this future's error to any error implementing From
for this future's Error
, returning a new future. Read more
fn then<F, B>(self, f: F) -> Then<Self, B, F> where
B: IntoFuture,
F: FnOnce(Result<Self::Item, Self::Error>) -> B,
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B: IntoFuture,
F: FnOnce(Result<Self::Item, Self::Error>) -> B,
Chain on a computation for when a future finished, passing the result of the future to the provided closure f
. Read more
fn and_then<F, B>(self, f: F) -> AndThen<Self, B, F> where
B: IntoFuture<Error = Self::Error>,
F: FnOnce(Self::Item) -> B,
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B: IntoFuture<Error = Self::Error>,
F: FnOnce(Self::Item) -> B,
Execute another future after this one has resolved successfully. Read more
fn or_else<F, B>(self, f: F) -> OrElse<Self, B, F> where
B: IntoFuture<Item = Self::Item>,
F: FnOnce(Self::Error) -> B,
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B: IntoFuture<Item = Self::Item>,
F: FnOnce(Self::Error) -> B,
Execute another future if this one resolves with an error. Read more
fn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future> where
B: IntoFuture<Item = Self::Item, Error = Self::Error>,
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B: IntoFuture<Item = Self::Item, Error = Self::Error>,
Waits for either one of two futures to complete. Read more
fn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future> where
B: IntoFuture,
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B: IntoFuture,
Waits for either one of two differently-typed futures to complete. Read more
fn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future> where
B: IntoFuture<Error = Self::Error>,
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B: IntoFuture<Error = Self::Error>,
Joins the result of two futures, waiting for them both to complete. Read more
fn join3<B, C>(
self,
b: B,
c: C
) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
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self,
b: B,
c: C
) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
Same as join
, but with more futures.
fn join4<B, C, D>(
self,
b: B,
c: C,
d: D
) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
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self,
b: B,
c: C,
d: D
) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
Same as join
, but with more futures.
fn join5<B, C, D, E>(
self,
b: B,
c: C,
d: D,
e: E
) -> Join5<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
E: IntoFuture<Error = Self::Error>,
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self,
b: B,
c: C,
d: D,
e: E
) -> Join5<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
E: IntoFuture<Error = Self::Error>,
Same as join
, but with more futures.
fn into_stream(self) -> IntoStream<Self>
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Convert this future into a single element stream. Read more
fn flatten(self) -> Flatten<Self> where
Self::Item: IntoFuture,
<Self::Item as IntoFuture>::Error: From<Self::Error>,
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Self::Item: IntoFuture,
<Self::Item as IntoFuture>::Error: From<Self::Error>,
Flatten the execution of this future when the successful result of this future is itself another future. Read more
fn flatten_stream(self) -> FlattenStream<Self> where
Self::Item: Stream,
<Self::Item as Stream>::Error == Self::Error,
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Self::Item: Stream,
<Self::Item as Stream>::Error == Self::Error,
Flatten the execution of this future when the successful result of this future is a stream. Read more
fn fuse(self) -> Fuse<Self>
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Fuse a future such that poll
will never again be called once it has completed. Read more
fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Item),
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F: FnOnce(&Self::Item),
Do something with the item of a future, passing it on. Read more
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,
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Self: UnwindSafe,
Catches unwinding panics while polling the future. Read more
fn shared(self) -> Shared<Self>
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Create a cloneable handle to this future where all handles will resolve to the same result. Read more
Auto Trait Implementations
impl<S, T> Send for Connection<S, T> where
S: Send,
T: Send,
S: Send,
T: Send,
impl<S, T> Sync for Connection<S, T> where
S: Sync,
T: Sync,
S: Sync,
T: Sync,
Blanket Implementations
impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T> From for T
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impl<T, U> TryFrom for T where
U: Into<T>,
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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>
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impl<T> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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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>
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<F> IntoFuture for F where
F: Future,
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F: Future,
type Future = F
The future that this type can be converted into.
type Item = <F as Future>::Item
The item that the future may resolve with.
type Error = <F as Future>::Error
The error that the future may resolve with.
fn into_future(self) -> F
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impl<T> Same for T
type Output = T
Should always be Self