pub struct Cursor<T> { /* private fields */ }
Expand description
A Cursor
streams the result of a query. When a query is made, the returned Cursor
will
contain the first batch of results from the server; the individual results will then be returned
as the Cursor
is iterated. When the batch is exhausted and if there are more results, the
Cursor
will fetch the next batch of documents, and so forth until the results are exhausted.
Note that because of this batching, additional network I/O may occur on any given call to
next
. Because of this, a Cursor
iterates over Result<T>
items rather than
simply T
items.
The batch size of the Cursor
can be configured using the options to the method that returns
it. For example, setting the batch_size
field of
FindOptions
will set the batch size of the
Cursor
returned by Collection::find
.
Note that the batch size determines both the number of documents stored in memory by the
Cursor
at a given time as well as the total number of network round-trips needed to fetch all
results from the server; both of these factors should be taken into account when choosing the
optimal batch size.
Cursor
implements Stream
, which means
it can be iterated over much in the same way that an Iterator
can be in synchronous Rust. In
order to do so, the StreamExt
trait must
be imported. Because a Cursor
iterates over a Result<T>
, it also has access to the
potentially more ergonomic functionality provided by
TryStreamExt
, which can be
imported instead of or in addition to
StreamExt
. The methods from
TryStreamExt
are especially useful when
used in conjunction with the ?
operator.
use futures::stream::{StreamExt, TryStreamExt};
let mut cursor = coll.find(None, None).await?;
// regular Stream uses next() and iterates over Option<Result<T>>
while let Some(doc) = cursor.next().await {
println!("{}", doc?)
}
// regular Stream uses collect() and collects into a Vec<Result<T>>
let v: Vec<Result<_>> = cursor.collect().await;
let mut cursor = coll.find(None, None).await?;
// TryStream uses try_next() and iterates over Result<Option<T>>
while let Some(doc) = cursor.try_next().await? {
println!("{}", doc)
}
// TryStream uses try_collect() and collects into a Result<Vec<T>>
let v: Vec<_> = cursor.try_collect().await?;
If a Cursor
is still open when it goes out of scope, it will automatically be closed via an
asynchronous killCursors command executed
from its Drop
implementation.
Implementations§
source§impl<T> Cursor<T>
impl<T> Cursor<T>
sourcepub async fn advance(&mut self) -> Result<bool>
pub async fn advance(&mut self) -> Result<bool>
Move the cursor forward, potentially triggering requests to the database for more results if the local buffer has been exhausted.
This will keep requesting data from the server until either the cursor is exhausted or batch with results in it has been received.
The return value indicates whether new results were successfully returned (true) or if the cursor has been closed (false).
Note: Cursor::current
and Cursor::deserialize_current
must only be called after
Cursor::advance
returned Ok(true)
. It is an error to call either of them without
calling Cursor::advance
first or after Cursor::advance
returns an error / false.
let mut cursor = coll.find(None, None).await?;
while cursor.advance().await? {
println!("{:?}", cursor.current());
}
sourcepub fn current(&self) -> &RawDocument
pub fn current(&self) -> &RawDocument
Returns a reference to the current result in the cursor.
Panics
Cursor::advance
must return Ok(true)
before Cursor::current
can be
invoked. Calling Cursor::current
after Cursor::advance
does not return true
or without calling Cursor::advance
at all may result in a panic.
let mut cursor = coll.find(None, None).await?;
while cursor.advance().await? {
println!("{:?}", cursor.current());
}
sourcepub fn deserialize_current<'a>(&'a self) -> Result<T>where
T: Deserialize<'a>,
pub fn deserialize_current<'a>(&'a self) -> Result<T>where T: Deserialize<'a>,
Deserialize the current result to the generic type associated with this cursor.
Panics
Cursor::advance
must return Ok(true)
before Cursor::deserialize_current
can be
invoked. Calling Cursor::deserialize_current
after Cursor::advance
does not return
true or without calling Cursor::advance
at all may result in a panic.
use serde::Deserialize;
#[derive(Debug, Deserialize)]
struct Cat<'a> {
#[serde(borrow)]
name: &'a str
}
let coll = db.collection::<Cat>("cat");
let mut cursor = coll.find(None, None).await?;
while cursor.advance().await? {
println!("{:?}", cursor.deserialize_current()?);
}
sourcepub fn with_type<'a, D>(self) -> Cursor<D>where
D: Deserialize<'a>,
pub fn with_type<'a, D>(self) -> Cursor<D>where D: Deserialize<'a>,
Update the type streamed values will be parsed as.
Trait Implementations§
source§impl<T> Stream for Cursor<T>where
T: DeserializeOwned + Unpin + Send + Sync,
impl<T> Stream for Cursor<T>where T: DeserializeOwned + Unpin + Send + Sync,
Auto Trait Implementations§
impl<T> !RefUnwindSafe for Cursor<T>
impl<T> Send for Cursor<T>where T: Send,
impl<T> !Sync for Cursor<T>
impl<T> Unpin for Cursor<T>where T: Unpin,
impl<T> !UnwindSafe for Cursor<T>
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fn into_async_read(self) -> IntoAsyncRead<Self>where Self: Sized + TryStreamExt<Error = Error>, Self::Ok: AsRef<[u8]>,
io
and std
only.AsyncBufRead
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