Enum WritablePolicy 

pub enum WritablePolicy {
    Require,
    Prefer,
}

Which write-session guarantee a lake connection pool enforces on every connection it hands out.

Variants

Require

Never hand out a read-only connection: reject it in after_connect (sqlx retries with a fresh DNS lookup) and evict it in before_acquire if it turned read-only while pooled. A write that arrives during a failover waits in acquire instead of failing against a demoted writer.

Prefer

Keep trying for a writable connection but fall back to a read-only one after FALLBACK_AFTER with no writable connect, re-probing for a writable primary every PROBE_INTERVAL while on a replica. Used by standalone FlightSQL, which has no other writer to fail over to and would rather serve reads from a replica than refuse to start.

Trait Implementations

impl Clone for WritablePolicy

fn clone(&self) -> WritablePolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WritablePolicy

impl Debug for WritablePolicy

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

Formats the value using the given formatter.

impl Eq for WritablePolicy

impl PartialEq for WritablePolicy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for WritablePolicy