Module transaction_scope 

Transaction scope for query execution instances.

• Session-level SessionTransactionController holds explicit transaction handles and manages state transitions.
• TransactionScope is the execution view for a single query: it carries pure metadata (transaction identity, mode, rollback flag).
• Begin/Commit/Rollback commands trigger real state transitions through the controller, not fake text results.
• Client disconnect rolls back auto-commit transactions owned by the instance, but does NOT end the session’s explicit transaction.

The SessionTransactionController is the single state machine that all transaction paths (SQL text, plan-based TxnOperator, embedded) flow through. The API layer (GraphService) owns the TransactionManager reference and performs the actual begin/commit/rollback; the controller tracks state.

Structs

SessionTransactionController

Session-level controller for explicit transactions.

TransactionCommandResult

Result of a transaction command (BEGIN, COMMIT, ROLLBACK).

TransactionId

Transaction ID type. Defined once here; do NOT duplicate in other modules.

Enums

CancelReason

Typed reason for query cancellation.

TransactionScope

The transaction scope for a single query execution.

TransactionState

Transaction state for session-level explicit transactions.