Struct ReadOnly 

#[non_exhaustive]
pub struct ReadOnly {
    pub return_read_timestamp: bool,
    pub timestamp_bound: Option<TimestampBound>,
    /* private fields */
}

Message type to initiate a read-only transaction.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

return_read_timestamp: bool

If true, the Cloud Spanner-selected read timestamp is included in the Transaction message that describes the transaction.

timestamp_bound: Option<TimestampBound>

How to choose the timestamp for the read-only transaction.

Implementations

impl ReadOnly

pub fn new() -> Self

Creates a new default instance.

pub fn set_return_read_timestamp<T: Into<bool>>(self, v: T) -> Self

Sets the value of return_read_timestamp.

pub fn set_timestamp_bound<T: Into<Option<TimestampBound>>>(self, v: T) -> Self

Sets the value of timestamp_bound.

Note that all the setters affecting timestamp_bound are mutually exclusive.

pub fn strong(&self) -> Option<&bool>

The value of timestamp_bound if it holds a Strong, None if the field is not set or holds a different branch.

pub fn set_strong<T: Into<bool>>(self, v: T) -> Self

Sets the value of timestamp_bound to hold a Strong.

Note that all the setters affecting timestamp_bound are mutually exclusive.

pub fn min_read_timestamp(&self) -> Option<&Box<Timestamp>>

The value of timestamp_bound if it holds a MinReadTimestamp, None if the field is not set or holds a different branch.

pub fn set_min_read_timestamp<T: Into<Box<Timestamp>>>(self, v: T) -> Self

Sets the value of timestamp_bound to hold a MinReadTimestamp.

Note that all the setters affecting timestamp_bound are mutually exclusive.

pub fn max_staleness(&self) -> Option<&Box<Duration>>

The value of timestamp_bound if it holds a MaxStaleness, None if the field is not set or holds a different branch.

pub fn set_max_staleness<T: Into<Box<Duration>>>(self, v: T) -> Self

Sets the value of timestamp_bound to hold a MaxStaleness.

Note that all the setters affecting timestamp_bound are mutually exclusive.

pub fn read_timestamp(&self) -> Option<&Box<Timestamp>>

The value of timestamp_bound if it holds a ReadTimestamp, None if the field is not set or holds a different branch.

pub fn set_read_timestamp<T: Into<Box<Timestamp>>>(self, v: T) -> Self

Sets the value of timestamp_bound to hold a ReadTimestamp.

Note that all the setters affecting timestamp_bound are mutually exclusive.

pub fn exact_staleness(&self) -> Option<&Box<Duration>>

The value of timestamp_bound if it holds a ExactStaleness, None if the field is not set or holds a different branch.

pub fn set_exact_staleness<T: Into<Box<Duration>>>(self, v: T) -> Self

Sets the value of timestamp_bound to hold a ExactStaleness.

Note that all the setters affecting timestamp_bound are mutually exclusive.

Trait Implementations

impl Clone for ReadOnly

fn clone(&self) -> ReadOnly

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReadOnly

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

Formats the value using the given formatter.

impl Default for ReadOnly

fn default() -> ReadOnly

Returns the “default value” for a type.

impl Message for ReadOnly

fn typename() -> &'static str

The typename of this message.

impl PartialEq for ReadOnly

fn eq(&self, other: &ReadOnly) -> 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 StructuralPartialEq for ReadOnly