rocket_db_pools::diesel::prelude

Struct PgConnection

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

The connection string expected by PgConnection::establish should be a PostgreSQL connection string, as documented at https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNSTRING

§Supported loading model implementations

If you are unsure which loading mode is the correct one for your application, you likely want to use the DefaultLoadingMode as that one offers generally better performance.

Due to the fact that PgConnection supports multiple loading modes it is required to always specify the used loading mode when calling RunQueryDsl::load_iter

§DefaultLoadingMode

By using this mode PgConnection defaults to loading all response values at once and only performs deserialization afterward for the DefaultLoadingMode. Generally this mode will be more performant as it.

This loading mode allows users to perform hold more than one iterator at once using the same connection:

use diesel::connection::DefaultLoadingMode;

let iter1 = users::table.load_iter::<(i32, String), DefaultLoadingMode>(connection)?;
let iter2 = users::table.load_iter::<(i32, String), DefaultLoadingMode>(connection)?;

for r in iter1 {
    let (id, name) = r?;
    println!("Id: {} Name: {}", id, name);
}

for r in iter2 {
    let (id, name) = r?;
    println!("Id: {} Name: {}", id, name);
}

§PgRowByRowLoadingMode

By using this mode PgConnection defaults to loading each row of the result set separately. This might be desired for huge result sets.

This loading mode prevents creating more than one iterator at once using the same connection. The following code is not allowed:

use diesel::pg::PgRowByRowLoadingMode;

let iter1 = users::table.load_iter::<(i32, String), PgRowByRowLoadingMode>(connection)?;
// creating a second iterator generates an compiler error
let iter2 = users::table.load_iter::<(i32, String), PgRowByRowLoadingMode>(connection)?;

for r in iter1 {
    let (id, name) = r?;
    println!("Id: {} Name: {}", id, name);
}

for r in iter2 {
    let (id, name) = r?;
    println!("Id: {} Name: {}", id, name);
}

Implementations§

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impl PgConnection

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pub fn build_transaction(&mut self) -> TransactionBuilder<'_, PgConnection>

Build a transaction, specifying additional details such as isolation level

See TransactionBuilder for more examples.

conn.build_transaction()
    .read_only()
    .serializable()
    .deferrable()
    .run(|conn| Ok(()))

Trait Implementations§

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impl Connection for PgConnection

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type Backend = Pg

The backend this type connects to
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type TransactionManager = AnsiTransactionManager

The transaction manager implementation used by this connection
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fn establish(database_url: &str) -> Result<PgConnection, ConnectionError>

Establishes a new connection to the database Read more
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fn execute_returning_count<T>(&mut self, source: &T) -> Result<usize, Error>
where T: QueryFragment<Pg> + QueryId,

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 AnsiTransactionManager

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 begin_test_transaction(&mut self) -> Result<(), Error>

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 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 GetPgMetadataCache for PgConnection

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fn get_metadata_cache(&mut self) -> &mut PgMetadataCache

Get the PgMetadataCache
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impl<B> LoadConnection<B> for PgConnection
where PgConnection: PgLoadingMode<B>,

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type Cursor<'conn, 'query> = <PgConnection as PgLoadingMode<B>>::Cursor<'conn, 'query>

The cursor type returned by LoadConnection::load Read more
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type Row<'conn, 'query> = <PgConnection as PgLoadingMode<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, ) -> Result<<PgConnection as LoadConnection<B>>::Cursor<'conn, 'query>, Error>

Executes a given query and returns any requested values Read more
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impl MigrationConnection for PgConnection

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fn setup(&mut self) -> Result<usize, Error>

Setup the following table: Read more
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impl MultiConnectionHelper for PgConnection

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fn to_any<'a>( lookup: &mut <<PgConnection as Connection>::Backend as TypeMetadata>::MetadataLookup, ) -> &mut (dyn Any + 'a)

Convert the lookup type to any
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fn from_any( lookup: &mut (dyn Any + 'static), ) -> Option<&mut <<PgConnection as Connection>::Backend as TypeMetadata>::MetadataLookup>

Get the lookup type from any
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impl R2D2Connection for PgConnection

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fn ping(&mut self) -> Result<(), Error>

Check if a connection is still valid
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fn is_broken(&mut self) -> bool

Checks if the connection is broken and should not be reused Read more
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impl SimpleConnection for PgConnection

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

Execute multiple SQL statements within the same string. Read more
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impl<'b, Changes, Output> UpdateAndFetchResults<Changes, Output> for PgConnection
where Changes: Copy + AsChangeset<Target = <Changes as HasTable>::Table> + IntoUpdateTarget, UpdateStatement<<Changes as HasTable>::Table, <Changes as IntoUpdateTarget>::WhereClause, <Changes as AsChangeset>::Changeset>: LoadQuery<'b, PgConnection, Output>, <<Changes as HasTable>::Table as Table>::AllColumns: ValidGrouping<()>, <<<Changes as HasTable>::Table as Table>::AllColumns as ValidGrouping<()>>::IsAggregate: MixedAggregates<No, Output = No>,

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

See the traits documentation.
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impl ConnectionSealed for PgConnection

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impl Send for PgConnection

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

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Maps the current connection to std::any::Any
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, Conn> RunQueryDsl<Conn> for T

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fn execute<'conn, 'query>( self, conn: &'conn mut Conn, ) -> <Conn as AsyncConnection>::ExecuteFuture<'conn, 'query>
where Conn: AsyncConnection + Send, Self: ExecuteDsl<Conn> + 'query,

Executes the given command, returning the number of rows affected. Read more
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fn load<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U>>>
where U: Send, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

Executes the given query, returning a Vec with the returned rows. Read more
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fn load_stream<'conn, 'query, U>( self, conn: &'conn mut Conn, ) -> Self::LoadFuture<'conn>
where Conn: AsyncConnection, U: 'conn, Self: LoadQuery<'query, Conn, U> + 'query,

Executes the given query, returning a Stream with the returned rows. Read more
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fn get_result<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<Self::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<Self::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>>>)) -> Result<U, Error>>, fn(_: Self::Stream<'conn>) -> Map<StreamFuture<Pin<Box<Self::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>>>)) -> Result<U, Error>>>
where U: Send + 'conn, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

Runs the command, and returns the affected row. Read more
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fn get_results<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U>>>
where U: Send, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

Runs the command, returning an Vec with the affected rows. Read more
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fn first<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<<Self::Output as LoadQuery<'query, Conn, U>>::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>)) -> Result<U, Error>>, fn(_: <Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>) -> Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>)) -> Result<U, Error>>>
where U: Send + 'conn, Conn: AsyncConnection, Self: LimitDsl, Self::Output: LoadQuery<'query, Conn, U> + Send + 'query,

Attempts to load a single record. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<Source> Sculptor<HNil, HNil> for Source

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type Remainder = Source

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fn sculpt(self) -> (HNil, <Source as Sculptor<HNil, HNil>>::Remainder)

Consumes the current HList and returns an HList with the requested shape. Read more
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
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fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. 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> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T