Enum Isolation 

pub enum Isolation {
    ReadUncommitted,
    ReadCommitted,
    RepeatableRead,
    Serializable,
}

事务隔离级别

遵循 SQL 标准四级隔离，从低到高排列（可用于 PartialOrd 比较）。

Variants

ReadUncommitted

读未提交（最低隔离级别，可能脏读）

ReadCommitted

读已提交（默认级别，无脏读）

RepeatableRead

可重复读（同一事务内多次读取一致）

Serializable

串行化（最高隔离级别，完全隔离）

Trait Implementations

impl Clone for Isolation

fn clone(&self) -> Isolation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Isolation

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

Formats the value using the given formatter.

impl Display for Isolation

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

Formats the value using the given formatter.

impl Ord for Isolation

fn cmp(&self, other: &Isolation) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Isolation

fn eq(&self, other: &Isolation) -> 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 PartialOrd for Isolation

fn partial_cmp(&self, other: &Isolation) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Isolation

impl Eq for Isolation

impl StructuralPartialEq for Isolation