pub enum RecyclingMethod {
Fast,
Verified,
Clean,
Custom(String),
}
Expand description
Variants
Fast
Only run Client::is_closed()
when recycling existing connections.
Unless you have special needs this is a safe choice.
Verified
Run Client::is_closed()
and execute a test query.
This is slower, but guarantees that the database connection is ready to
be used. Normally, Client::is_closed()
should be enough to filter
out bad connections, but under some circumstances (i.e. hard-closed
network connections) it’s possible that Client::is_closed()
returns false
while the connection is dead. You will receive an error
on your first query then.
Clean
Like Verified
query method, but instead use the following sequence
of statements which guarantees a pristine connection:
CLOSE ALL;
SET SESSION AUTHORIZATION DEFAULT;
RESET ALL;
UNLISTEN *;
SELECT pg_advisory_unlock_all();
DISCARD TEMP;
DISCARD SEQUENCES;
This is similar to calling DISCARD ALL
. but doesn’t call
DEALLOCATE ALL
and DISCARD PLAN
, so that the statement cache is not
rendered ineffective.
Custom(String)
Like Verified
but allows to specify a custom SQL to be executed.
Implementations
Trait Implementations
sourceimpl Clone for RecyclingMethod
impl Clone for RecyclingMethod
sourcefn clone(&self) -> RecyclingMethod
fn clone(&self) -> RecyclingMethod
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for RecyclingMethod
impl Debug for RecyclingMethod
sourceimpl Default for RecyclingMethod
impl Default for RecyclingMethod
sourceimpl<'de> Deserialize<'de> for RecyclingMethod
impl<'de> Deserialize<'de> for RecyclingMethod
sourcefn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
sourceimpl PartialEq<RecyclingMethod> for RecyclingMethod
impl PartialEq<RecyclingMethod> for RecyclingMethod
sourcefn eq(&self, other: &RecyclingMethod) -> bool
fn eq(&self, other: &RecyclingMethod) -> bool
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
sourcefn ne(&self, other: &RecyclingMethod) -> bool
fn ne(&self, other: &RecyclingMethod) -> bool
This method tests for !=
.
sourceimpl Serialize for RecyclingMethod
impl Serialize for RecyclingMethod
impl Eq for RecyclingMethod
impl StructuralEq for RecyclingMethod
impl StructuralPartialEq for RecyclingMethod
Auto Trait Implementations
impl RefUnwindSafe for RecyclingMethod
impl Send for RecyclingMethod
impl Sync for RecyclingMethod
impl Unpin for RecyclingMethod
impl UnwindSafe for RecyclingMethod
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more