The representation of a Cloud Spanner transaction.
A transaction is a set of reads and writes that execute atomically at a single logical point in time across the columns/rows/tables in a database. Those reads and writes are grouped by passing them the same Transaction.
All reads/writes in the transaction must be executed within the same session, and that session may have only one transaction active at a time.
Spanner supports these transaction modes:
ReadOnly. Provides guaranteed consistency across several reads, but does not allow writes. Can be configured to read at timestamps in the past. Does not need to be committed and does not take locks.
ReadWrite. Supports reading and writing data at a single point in time. Uses pessimistic locking and, if necessary, two-phase commit. May abort, requiring the application to rerun.
SingleUse. A restricted form of a ReadOnly transaction where Spanner chooses the read timestamp.
Constructors
Transaction(ReadOnlyOptions)
Construction of read-only and read-write transactions.
Parameter
Name
Description
opts
ReadOnlyOptions
Transaction(ReadWriteOptions)
Construction of read-only and read-write transactions.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22 UTC."],[[["\u003cp\u003eThis document details the \u003ccode\u003eTransaction\u003c/code\u003e class within the Google Cloud Spanner C++ client library, which facilitates the grouping of reads and writes into atomic operations.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eTransaction\u003c/code\u003e class supports three modes: ReadOnly, for consistent reads without writes; ReadWrite, for both reads and writes with potential aborts; and SingleUse, a restricted read-only mode where Spanner determines the timestamp.\u003c/p\u003e\n"],["\u003cp\u003eThe class uses lazy evaluation, meaning no network requests occur upon object creation; they are triggered by the first server request, like \u003ccode\u003eExecuteQuery()\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eMultiple versions of the \u003ccode\u003eTransaction\u003c/code\u003e class are available, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc, all of which can be accessed from the document.\u003c/p\u003e\n"],["\u003cp\u003eThe Transaction class supports copy, assign, move.\u003c/p\u003e\n"]]],[],null,[]]
