Enum deadpool_postgres::RecyclingMethod

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pub enum RecyclingMethod {
    Fast,
    Verified,
    Clean,
    Custom(String),
}
Expand description

Possible methods of how a connection is recycled.

The default is Fast which does not check the connection health or perform any clean-up queries.

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Fast

Only run Client::is_closed() when recycling existing connections.

Unless you have special needs this is a safe choice.

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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.

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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.

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Custom(String)

Like Verified but allows to specify a custom SQL to be executed.

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impl RecyclingMethod

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pub fn query(&self) -> Option<&str>

Returns SQL query to be executed when recycling a connection.

Trait Implementations§

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impl Clone for RecyclingMethod

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fn clone(&self) -> RecyclingMethod

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for RecyclingMethod

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

Formats the value using the given formatter. Read more
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impl Default for RecyclingMethod

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for RecyclingMethod

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for RecyclingMethod

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fn eq(&self, other: &RecyclingMethod) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for RecyclingMethod

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Eq for RecyclingMethod

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impl StructuralPartialEq for RecyclingMethod

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

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

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fn into(self) -> U

Calls U::from(self).

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impl<T> Same for T

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type Output = T

Should always be Self
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where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
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type Error = Infallible

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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

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

Performs the conversion.
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