Struct diesel::r2d2::PooledConnection

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pub struct PooledConnection<M>{ /* private fields */ }
Available on crate feature r2d2 only.
Expand description

A smart pointer wrapping a connection.

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impl<M> PooledConnection<M>

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pub fn extensions(this: &PooledConnection<M>) -> &Extensions

Returns a shared reference to the extensions associated with this connection.

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pub fn extensions_mut(this: &mut PooledConnection<M>) -> &mut Extensions

Returns a mutable reference to the extensions associated with this connection.

Trait Implementations§

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impl<M> Connection for PooledConnection<M>

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type Backend = <<M as ManageConnection>::Connection as Connection>::Backend

The backend this type connects to
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type TransactionManager = PoolTransactionManager<<<M as ManageConnection>::Connection as Connection>::TransactionManager>

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
The transaction manager implementation used by this connection
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fn establish(_: &str) -> ConnectionResult<Self>

Establishes a new connection to the database Read more
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fn begin_test_transaction(&mut self) -> QueryResult<()>

Creates a transaction that will never be committed. This is useful for tests. Panics if called while inside of a transaction or if called with a connection containing a broken transaction
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fn execute_returning_count<T>(&mut self, source: &T) -> QueryResult<usize>
where T: QueryFragment<Self::Backend> + QueryId,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
Execute a single SQL statements given by a query and return number of affected rows
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fn transaction_state( &mut self ) -> &mut <Self::TransactionManager as TransactionManager<Self>>::TransactionStateData

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
Get access to the current transaction state of this connection Read more
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fn transaction<T, E, F>(&mut self, f: F) -> Result<T, E>
where F: FnOnce(&mut Self) -> Result<T, E>, E: From<Error>,

Executes the given function inside of a database transaction Read more
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fn test_transaction<T, E, F>(&mut self, f: F) -> T
where F: FnOnce(&mut Self) -> Result<T, E>, E: Debug,

Executes the given function inside a transaction, but does not commit it. Panics if the given function returns an error. Read more
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impl<M> Debug for PooledConnection<M>

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

Formats the value using the given formatter. Read more
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impl<M> Deref for PooledConnection<M>

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type Target = <M as ManageConnection>::Connection

The resulting type after dereferencing.
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fn deref(&self) -> &<M as ManageConnection>::Connection

Dereferences the value.
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impl<M> DerefMut for PooledConnection<M>

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fn deref_mut(&mut self) -> &mut <M as ManageConnection>::Connection

Mutably dereferences the value.
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impl<M> Drop for PooledConnection<M>

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<B, M> LoadConnection<B> for PooledConnection<M>

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type Cursor<'conn, 'query> = <<M as ManageConnection>::Connection as LoadConnection<B>>::Cursor<'conn, 'query>

The cursor type returned by LoadConnection::load Read more
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type Row<'conn, 'query> = <<M as ManageConnection>::Connection as LoadConnection<B>>::Row<'conn, 'query>

The row type used as Iterator::Item for the iterator implementation of LoadConnection::Cursor
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fn load<'conn, 'query, T>( &'conn mut self, source: T ) -> QueryResult<Self::Cursor<'conn, 'query>>
where T: Query + QueryFragment<Self::Backend> + QueryId + 'query, Self::Backend: QueryMetadata<T::SqlType>,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
Executes a given query and returns any requested values Read more
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impl<M> MigrationConnection for PooledConnection<M>

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fn setup(&mut self) -> QueryResult<usize>

Setup the following table: Read more
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impl<M> SimpleConnection for PooledConnection<M>
where M: ManageConnection, M::Connection: R2D2Connection + Send + 'static,

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fn batch_execute(&mut self, query: &str) -> QueryResult<()>

Execute multiple SQL statements within the same string. Read more
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impl<Changes, Output, M> UpdateAndFetchResults<Changes, Output> for PooledConnection<M>
where M: ManageConnection, M::Connection: UpdateAndFetchResults<Changes, Output>, Self: Connection,

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fn update_and_fetch(&mut self, changeset: Changes) -> QueryResult<Output>

See the traits documentation.
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impl<M> ConnectionSealed for PooledConnection<M>

Auto Trait Implementations§

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<C> BoxableConnection<<C as Connection>::Backend> for C
where C: Connection + Any,

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fn as_any(&self) -> &(dyn Any + 'static)

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
Maps the current connection to std::any::Any
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

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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> IntoSql for T

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fn into_sql<T>(self) -> AsExprOf<Self, T>

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>

Convert &self to an expression for Diesel’s query builder. 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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> Formattable for T
where T: Deref, <T as Deref>::Target: Formattable,

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impl<T> Parsable for T
where T: Deref, <T as Deref>::Target: Parsable,