Enum LockLevel 

pub enum LockLevel {
    None,
    AccessShareLock,
    RowShareLock,
    RowExclusiveLock,
    ShareUpdateExclusiveLock,
    ShareLock,
    ShareRowExclusiveLock,
    ExclusiveLock,
    AccessExclusiveLock,
}

PostgreSQL lock levels, ordered from least to most restrictive.

The ordering matches PostgreSQL’s internal lock hierarchy so that comparisons (e.g. lock > LockLevel::ShareLock) work correctly.

Variants

None

No lock acquired (new objects, functions, enums).

AccessShareLock

ACCESS SHARE — acquired by SELECT.

RowShareLock

ROW SHARE — acquired by SELECT FOR UPDATE/SHARE.

RowExclusiveLock

ROW EXCLUSIVE — acquired by INSERT/UPDATE/DELETE.

ShareUpdateExclusiveLock

SHARE UPDATE EXCLUSIVE — acquired by VACUUM, CREATE INDEX CONCURRENTLY.

ShareLock

SHARE — acquired by CREATE INDEX (non-concurrent).

ShareRowExclusiveLock

SHARE ROW EXCLUSIVE — acquired by some constraint triggers.

ExclusiveLock

EXCLUSIVE — blocks all reads/writes except ACCESS SHARE.

AccessExclusiveLock

ACCESS EXCLUSIVE — the strongest lock; blocks everything.

Trait Implementations

impl Clone for LockLevel

fn clone(&self) -> LockLevel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LockLevel

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

Formats the value using the given formatter.

impl Display for LockLevel

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

Formats the value using the given formatter.

impl Ord for LockLevel

fn cmp(&self, other: &LockLevel) -> 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 LockLevel

fn eq(&self, other: &LockLevel) -> 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 LockLevel

fn partial_cmp(&self, other: &LockLevel) -> 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 Serialize for LockLevel

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for LockLevel

impl Eq for LockLevel

impl StructuralPartialEq for LockLevel