Enum LockMode 

pub enum LockMode {
    KeyShare,
    Share,
    NoKeyUpdate,
    Exclusive,
}

A PG tuple-lock strength. FOR KEY SHARE / FOR SHARE / FOR NO KEY UPDATE / FOR UPDATE, plus the implicit modes a write takes: a key-touching UPDATE or any DELETE takes Exclusive; a non-key UPDATE takes NoKeyUpdate.

Variants

KeyShare

Share

NoKeyUpdate

Exclusive

Implementations

impl LockMode

pub fn conflicts_with(self, requested: LockMode) -> bool

PG tuple-lock conflict matrix. held.conflicts_with(requested) is true iff a currently-held lock in mode self blocks a new request in mode requested.

  held \ req  KeyShare  Share  NoKeyUpd  Excl
  KeyShare       ok      ok      ok        X
  Share          ok      ok      X         X
  NoKeyUpdate    ok      X       X         X
  Exclusive      X       X       X         X

Trait Implementations

impl Clone for LockMode

fn clone(&self) -> LockMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LockMode

impl Debug for LockMode

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

Formats the value using the given formatter.

impl Eq for LockMode

impl Ord for LockMode

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

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for LockMode

fn partial_cmp(&self, other: &LockMode) -> 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 StructuralPartialEq for LockMode