Struct Session

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pub struct Session<T = Bound>(/* private fields */);
Expand description

A session object is used to execute queries and maintains cluster state through the control connection. The control connection is used to auto-discover nodes and monitor cluster changes (topology and schema). Each session also maintains multiple /pools of connections to cluster nodes which are used to query the cluster.

Instances of the session object are thread-safe to execute queries.

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impl<S> Session<S>
where S: SessionScope,

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pub fn statement(&self, query: impl AsRef<str>) -> Statement<S>

Creates a statement with the given query.

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pub async fn execute(&self, query: impl AsRef<str>) -> Result<CassResult>

Executes a given query.

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pub fn batch(&self, batch_type: BatchType) -> Batch<S>

Creates a new batch that is bound to this session.

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pub fn get_schema_meta(&self) -> SchemaMeta

Gets a snapshot of this session’s schema metadata. The returned snapshot of the schema metadata is not updated. This function must be called again to retrieve any schema changes since the previous call.

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pub fn get_metrics(&self) -> SessionMetrics

Gets a copy of this session’s performance/diagnostic metrics.

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pub async fn prepare( &self, query: impl AsRef<str>, ) -> Result<PreparedStatement<S>>

Create a prepared statement with the given query.

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impl Session<Bound>

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pub fn keyspace(&self) -> &str

Returns the keyspace that the session is bound to.

Trait Implementations§

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impl<T: Clone> Clone for Session<T>

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fn clone(&self) -> Session<T>

Returns a duplicate 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: Debug> Debug for Session<T>

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

Formats the value using the given formatter. Read more
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impl Default for Session<Unbound>

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fn default() -> Session<Unbound>

Returns the “default value” for a type. Read more
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impl<T> PartialEq for Session<T>

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> Eq for Session<T>

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impl<T: Send> Send for Session<T>

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impl<T: Sync> Sync for Session<T>

Auto Trait Implementations§

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impl<T> Freeze for Session<T>

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impl<T> RefUnwindSafe for Session<T>
where T: RefUnwindSafe,

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impl<T> Unpin for Session<T>

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impl<T> UnwindSafe for Session<T>
where T: RefUnwindSafe,

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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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
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> SendSyncUnwindSafe for T
where T: Send + Sync + UnwindSafe + ?Sized,