pub struct CancelToken { /* private fields */ }
Expand description

The capability to request cancellation of in-progress queries on a connection.

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impl CancelToken

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pub async fn cancel_query<T>(&self, tls: T) -> Result<(), Error>where T: MakeTlsConnect<Socket>,

Attempts to cancel the in-progress query on the connection associated with this CancelToken.

The server provides no information about whether a cancellation attempt was successful or not. An error will only be returned if the client was unable to connect to the database.

Cancellation is inherently racy. There is no guarantee that the cancellation request will reach the server before the query terminates normally, or that the connection associated with this token is still active.

Requires the runtime Cargo feature (enabled by default).

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pub async fn cancel_query_raw<S, T>( &self, stream: S, tls: T ) -> Result<(), Error>where S: AsyncRead + AsyncWrite + Unpin, T: TlsConnect<S>,

Like cancel_query, but uses a stream which is already connected to the server rather than opening a new connection itself.

Trait Implementations§

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impl Clone for CancelToken

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fn clone(&self) -> CancelToken

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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

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

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fn from(t: T) -> T

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impl<T> Instrument for T

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

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fn into(self) -> U

Calls U::from(self).

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

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type Output = T

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type Owned = T

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

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type Error = Infallible

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

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