Struct diesel::r2d2::Extensions

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pub struct Extensions(_);

Expand description

A “type map” used to associate data with pooled connections.

Extensions is a data structure mapping types to a value of that type. This can be used to, for example, cache prepared statements along side their connection.

Implementations

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impl Extensions

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pub fn new() -> Extensions

Returns a new, empty Extensions.

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pub fn insert<T>(&mut self, value: T) -> Option<T>where
T: 'static + Sync + Send,

Inserts a new value into the map.

Returns the previously stored value of that type, if present.

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pub fn get<T>(&self) -> Option<&T>where
T: 'static + Sync + Send,

Returns a shared reference to the stored value of the specified type.

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pub fn get_mut<T>(&mut self) -> Option<&mut T>where
T: 'static + Sync + Send,

Returns a mutable reference to the stored value of the specified type.

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pub fn remove<T>(&mut self) -> Option<T>where
T: 'static + Sync + Send,

Removes the value of the specified type from the map, returning it.

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pub fn clear(&mut self)

Removes all values from the map.

Trait Implementations

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impl Default for Extensions

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fn default() -> Extensions

Returns the “default value” for a type. Read more

Auto Trait Implementations

impl !RefUnwindSafe for Extensions

impl Send for Extensions

impl Sync for Extensions

impl Unpin for Extensions

impl !UnwindSafe for Extensions

Blanket Implementations

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impl<T> Any for Twhere
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 Twhere
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for Twhere
T: ?Sized,

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

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> IntoSql for T

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fn into_sql<T>(self) -> AsExprOf<Self, T>where
Self: AsExpression<T> + Sized,
T: SqlType + TypedExpressionType,

Convert self to an expression for Diesel’s query builder. Read more

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fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>where
&'a Self: AsExpression<T>,
T: SqlType + TypedExpressionType,

Convert &self to an expression for Diesel’s query builder. Read more

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct diesel::r2d2::Extensions

Implementations

impl Extensions

pub fn new() -> Extensions

pub fn insert<T>(&mut self, value: T) -> Option<T>where
T: 'static + Sync + Send,

pub fn get<T>(&self) -> Option<&T>where
T: 'static + Sync + Send,

pub fn get_mut<T>(&mut self) -> Option<&mut T>where
T: 'static + Sync + Send,

pub fn remove<T>(&mut self) -> Option<T>where
T: 'static + Sync + Send,

pub fn clear(&mut self)

Trait Implementations

impl Default for Extensions

fn default() -> Extensions

Auto Trait Implementations

impl !RefUnwindSafe for Extensions

impl Send for Extensions

impl Sync for Extensions

impl Unpin for Extensions

impl !UnwindSafe for Extensions

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Twhere
T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere
T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<T> IntoSql for T

fn into_sql<T>(self) -> AsExprOf<Self, T>where
Self: AsExpression<T> + Sized,
T: SqlType + TypedExpressionType,

fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>where
&'a Self: AsExpression<T>,
T: SqlType + TypedExpressionType,

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

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

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

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Struct diesel::r2d2::Extensions

Implementations

impl Extensions

pub fn new() -> Extensions

pub fn insert<T>(&mut self, value: T) -> Option<T>where T: 'static + Sync + Send,

pub fn get<T>(&self) -> Option<&T>where T: 'static + Sync + Send,

pub fn get_mut<T>(&mut self) -> Option<&mut T>where T: 'static + Sync + Send,

pub fn remove<T>(&mut self) -> Option<T>where T: 'static + Sync + Send,

pub fn clear(&mut self)

Trait Implementations

impl Default for Extensions

fn default() -> Extensions

Auto Trait Implementations

impl !RefUnwindSafe for Extensions

impl Send for Extensions

impl Sync for Extensions

impl Unpin for Extensions

impl !UnwindSafe for Extensions

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<T> IntoSql for T

fn into_sql<T>(self) -> AsExprOf<Self, T>where Self: AsExpression<T> + Sized, T: SqlType + TypedExpressionType,

fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>where &'a Self: AsExpression<T>, T: SqlType + TypedExpressionType,

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

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

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

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

pub fn insert<T>(&mut self, value: T) -> Option<T>where
T: 'static + Sync + Send,

pub fn get<T>(&self) -> Option<&T>where
T: 'static + Sync + Send,

pub fn get_mut<T>(&mut self) -> Option<&mut T>where
T: 'static + Sync + Send,

pub fn remove<T>(&mut self) -> Option<T>where
T: 'static + Sync + Send,

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

impl<T> Borrow<T> for Twhere
T: ?Sized,

impl<T> BorrowMut<T> for Twhere
T: ?Sized,

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

fn into_sql<T>(self) -> AsExprOf<Self, T>where
Self: AsExpression<T> + Sized,
T: SqlType + TypedExpressionType,

fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>where
&'a Self: AsExpression<T>,
T: SqlType + TypedExpressionType,

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

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