Enum google_api_proto::google::spanner::v1::transaction_options::read_write::ReadLockMode

#[repr(i32)]
pub enum ReadLockMode {
    Unspecified = 0,
    Pessimistic = 1,
    Optimistic = 2,
}

ReadLockMode is used to set the read lock mode for read-write transactions.

Variants

Unspecified = 0

Default value.

If the value is not specified, the pessimistic read lock is used.

Pessimistic = 1

Pessimistic lock mode.

Read locks are acquired immediately on read.

Optimistic = 2

Optimistic lock mode.

Locks for reads within the transaction are not acquired on read. Instead the locks are acquired on a commit to validate that read/queried data has not changed since the transaction started.

Implementations

impl ReadLockMode

pub fn is_valid(value: i32) -> bool

Returns true if value is a variant of ReadLockMode.

pub fn from_i32(value: i32) -> Option<ReadLockMode>

👎Deprecated: Use the TryFrom<i32> implementation instead

Converts an i32 to a ReadLockMode, or None if value is not a valid variant.

impl ReadLockMode

pub fn as_str_name(&self) -> &'static str

String value of the enum field names used in the ProtoBuf definition.

The values are not transformed in any way and thus are considered stable (if the ProtoBuf definition does not change) and safe for programmatic use.

pub fn from_str_name(value: &str) -> Option<Self>

Creates an enum from field names used in the ProtoBuf definition.

Trait Implementations

impl Clone for ReadLockMode

fn clone(&self) -> ReadLockMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ReadLockMode

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

Formats the value using the given formatter.

impl Default for ReadLockMode

fn default() -> ReadLockMode

Returns the “default value” for a type.

impl From<ReadLockMode> for i32

fn from(value: ReadLockMode) -> i32

Converts to this type from the input type.

impl Hash for ReadLockMode

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for ReadLockMode

fn cmp(&self, other: &ReadLockMode) -> 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 + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for ReadLockMode

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for ReadLockMode

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl TryFrom<i32> for ReadLockMode

type Error = DecodeError

The type returned in the event of a conversion error.

fn try_from(value: i32) -> Result<ReadLockMode, DecodeError>

Performs the conversion.

impl Copy for ReadLockMode

impl Eq for ReadLockMode

impl StructuralPartialEq for ReadLockMode