Enum mz_coord::session::TransactionStatus

pub enum TransactionStatus<T> {
    Default,
    Started(Transaction<T>),
    InTransaction(Transaction<T>),
    InTransactionImplicit(Transaction<T>),
    Failed(Transaction<T>),
}

The transaction status of a session.

PostgreSQL’s transaction states are in backend/access/transam/xact.c.

Variants

Default

Idle. Matches TBLOCK_DEFAULT.

Started(Transaction<T>)

Running a single-query transaction. Matches TBLOCK_STARTED.

InTransaction(Transaction<T>)

Currently in a transaction issued from a BEGIN. Matches TBLOCK_INPROGRESS.

InTransactionImplicit(Transaction<T>)

Currently in an implicit transaction started from a multi-statement query with more than 1 statements. Matches TBLOCK_IMPLICIT_INPROGRESS.

Failed(Transaction<T>)

In a failed transaction that was started explicitly (i.e., previously InTransaction). We do not use Failed for implicit transactions because those cleanup after themselves. Matches TBLOCK_ABORT.

Implementations

impl<T> TransactionStatus<T>

pub fn into_ops_and_lock_guard(
    self
) -> (Option<TransactionOps<T>>, Option<OwnedMutexGuard<()>>)

Extracts the inner transaction ops and write lock guard if not failed.

pub fn inner(&self) -> Option<&Transaction<T>>

Exposes the inner transaction.

pub fn inner_mut(&mut self) -> Option<&mut Transaction<T>>

Exposes the inner transaction.

pub fn is_implicit(&self) -> bool

Expresses whether or not the transaction was implicitly started. However, its negation does not imply explicitly started.

pub fn grant_write_lock(&mut self, guard: OwnedMutexGuard<()>)

Grants the write lock to the inner transaction.

Panics

If self is TransactionStatus::Default, which indicates that the transaction is idle, which is not appropriate to assign the coordinator’s write lock to.

Trait Implementations

impl<T: Debug> Debug for TransactionStatus<T>

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

Formats the value using the given formatter.

impl<T> Default for TransactionStatus<T>

fn default() -> Self

Returns the “default value” for a type.