Enum deadpool_postgres::config::RecyclingMethod

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

This enum is used to control how the connection is recycled. Attention: The current default is Verified but will be changed to Fast in the next minor release of deadpool-postgres. Please make sure to explicitly state this if you want to keep using the Verified recycling method.

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 is possible that Client::is_closed returns false but 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 prestine 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 does not 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

impl RecyclingMethod

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

Return SQL query to be executed when recycling a connection.

Trait Implementations

impl Clone for RecyclingMethod

fn clone(&self) -> RecyclingMethod

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RecyclingMethod

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

Formats the value using the given formatter.

impl Default for RecyclingMethod

fn default() -> Self

Returns the "default value" for a type.

impl<'de> Deserialize<'de> for RecyclingMethod

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

Deserialize this value from the given Serde deserializer.

impl PartialEq<RecyclingMethod> for RecyclingMethod

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl StructuralPartialEq for RecyclingMethod