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§
Source§impl PgConnection
impl PgConnection
Sourcepub fn build_transaction(&mut self) -> TransactionBuilder<'_, PgConnection>
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§
Source§impl Connection for PgConnection
impl Connection for PgConnection
Source§type TransactionManager = AnsiTransactionManager
type TransactionManager = AnsiTransactionManager
Source§fn establish(database_url: &str) -> Result<PgConnection, ConnectionError>
fn establish(database_url: &str) -> Result<PgConnection, ConnectionError>
Source§fn execute_returning_count<T>(&mut self, source: &T) -> Result<usize, Error>
fn execute_returning_count<T>(&mut self, source: &T) -> Result<usize, Error>
Source§fn transaction_state(&mut self) -> &mut AnsiTransactionManagerwhere
PgConnection: Sized,
fn transaction_state(&mut self) -> &mut AnsiTransactionManagerwhere
PgConnection: Sized,
Source§fn transaction<T, E, F>(&mut self, f: F) -> Result<T, E>
fn transaction<T, E, F>(&mut self, f: F) -> Result<T, E>
Source§impl GetPgMetadataCache for PgConnection
impl GetPgMetadataCache for PgConnection
Source§fn get_metadata_cache(&mut self) -> &mut PgMetadataCache
fn get_metadata_cache(&mut self) -> &mut PgMetadataCache
PgMetadataCache
Source§impl<B> LoadConnection<B> for PgConnectionwhere
PgConnection: PgLoadingMode<B>,
impl<B> LoadConnection<B> for PgConnectionwhere
PgConnection: PgLoadingMode<B>,
Source§type Cursor<'conn, 'query> = <PgConnection as PgLoadingMode<B>>::Cursor<'conn, 'query>
type Cursor<'conn, 'query> = <PgConnection as PgLoadingMode<B>>::Cursor<'conn, 'query>
LoadConnection::load
Read moreSource§type Row<'conn, 'query> = <PgConnection as PgLoadingMode<B>>::Row<'conn, 'query>
type Row<'conn, 'query> = <PgConnection as PgLoadingMode<B>>::Row<'conn, 'query>
Iterator::Item
for the iterator implementation
of LoadConnection::Cursor
Source§fn load<'conn, 'query, T>(
&'conn mut self,
source: T,
) -> Result<<PgConnection as LoadConnection<B>>::Cursor<'conn, 'query>, Error>where
T: Query + QueryFragment<<PgConnection as Connection>::Backend> + QueryId + 'query,
<PgConnection as Connection>::Backend: QueryMetadata<<T as Query>::SqlType>,
fn load<'conn, 'query, T>(
&'conn mut self,
source: T,
) -> Result<<PgConnection as LoadConnection<B>>::Cursor<'conn, 'query>, Error>where
T: Query + QueryFragment<<PgConnection as Connection>::Backend> + QueryId + 'query,
<PgConnection as Connection>::Backend: QueryMetadata<<T as Query>::SqlType>,
Source§impl MigrationConnection for PgConnection
impl MigrationConnection for PgConnection
Source§impl MultiConnectionHelper for PgConnection
impl MultiConnectionHelper for PgConnection
Source§fn to_any<'a>(
lookup: &mut <<PgConnection as Connection>::Backend as TypeMetadata>::MetadataLookup,
) -> &mut (dyn Any + 'a)
fn to_any<'a>( lookup: &mut <<PgConnection as Connection>::Backend as TypeMetadata>::MetadataLookup, ) -> &mut (dyn Any + 'a)
Source§fn from_any(
lookup: &mut (dyn Any + 'static),
) -> Option<&mut <<PgConnection as Connection>::Backend as TypeMetadata>::MetadataLookup>
fn from_any( lookup: &mut (dyn Any + 'static), ) -> Option<&mut <<PgConnection as Connection>::Backend as TypeMetadata>::MetadataLookup>
Source§impl R2D2Connection for PgConnection
impl R2D2Connection for PgConnection
Source§impl SimpleConnection for PgConnection
impl SimpleConnection for PgConnection
Source§impl<'b, Changes, Output> UpdateAndFetchResults<Changes, Output> for PgConnectionwhere
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>,
impl<'b, Changes, Output> UpdateAndFetchResults<Changes, Output> for PgConnectionwhere
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>,
Source§fn update_and_fetch(&mut self, changeset: Changes) -> Result<Output, Error>
fn update_and_fetch(&mut self, changeset: Changes) -> Result<Output, Error>
impl ConnectionSealed for PgConnection
impl Send for PgConnection
Auto Trait Implementations§
impl Freeze for PgConnection
impl RefUnwindSafe for PgConnection
impl !Sync for PgConnection
impl Unpin for PgConnection
impl UnwindSafe for PgConnection
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Source§impl<T> Tap for T
impl<T> Tap for T
Source§fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
Borrow<B>
of a value. Read moreSource§fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
BorrowMut<B>
of a value. Read moreSource§fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
AsRef<R>
view of a value. Read moreSource§fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
AsMut<R>
view of a value. Read moreSource§fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
Deref::Target
of a value. Read moreSource§fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
Deref::Target
of a value. Read moreSource§fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self
fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self
.tap()
only in debug builds, and is erased in release builds.Source§fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self
fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self
.tap_mut()
only in debug builds, and is erased in release
builds.Source§fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
.tap_borrow()
only in debug builds, and is erased in release
builds.Source§fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
.tap_borrow_mut()
only in debug builds, and is erased in release
builds.Source§fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
.tap_ref()
only in debug builds, and is erased in release
builds.Source§fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
.tap_ref_mut()
only in debug builds, and is erased in release
builds.Source§fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
.tap_deref()
only in debug builds, and is erased in release
builds.