Enum IsolationLevel 

pub enum IsolationLevel {
    ReadCommitted,
    RepeatableRead,
    Serializable,
}

Isolation level for transactions

Controls how concurrent transactions interact with each other. Higher isolation levels provide stronger consistency guarantees at the cost of reduced concurrency.

Isolation Level Comparison

Level	Dirty Reads	Non-Repeatable Reads	Phantom Reads
ReadCommitted	No	Yes	Yes
RepeatableRead	No	No	Possible
Serializable	No	No	No

Variants

ReadCommitted

Read Committed isolation

Each statement sees a fresh snapshot of committed data. Two identical queries in the same transaction may return different results if another transaction commits between them.

RepeatableRead

Repeatable Read isolation (also known as Snapshot Isolation)

The transaction sees a consistent snapshot taken at the start. All statements in the transaction see the same data, regardless of concurrent commits.

Serializable

Serializable isolation

Provides full serializability with conflict detection. Transactions appear to execute one at a time, even when running concurrently. May abort transactions to prevent anomalies.

Implementations

impl IsolationLevel

pub const Snapshot: Self = Self::RepeatableRead

Alias for RepeatableRead - commonly called Snapshot Isolation

Trait Implementations

impl Clone for IsolationLevel

fn clone(&self) -> IsolationLevel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IsolationLevel

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

Formats the value using the given formatter.

impl Default for IsolationLevel

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for IsolationLevel

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for IsolationLevel

impl Eq for IsolationLevel

impl StructuralPartialEq for IsolationLevel