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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22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\u003eThe provided content outlines the \u003ccode\u003eTransaction\u003c/code\u003e class in Google Cloud Spanner, which is used to group database reads and writes to execute atomically.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eTransaction\u003c/code\u003e class supports three transaction modes: ReadOnly (for consistent reads without writes), ReadWrite (for both reads and writes), and SingleUse (a restricted ReadOnly mode where Spanner sets the read timestamp).\u003c/p\u003e\n"],["\u003cp\u003eConstructors for the \u003ccode\u003eTransaction\u003c/code\u003e class are available to initialize ReadOnly and ReadWrite options, and all of them are lazily evaluated, meaning no RPCs are made during creation, but rather during the first server request.\u003c/p\u003e\n"],["\u003cp\u003eThe content lists various versions of the \u003ccode\u003eTransaction\u003c/code\u003e class, starting from version 2.11.0 up to the latest release candidate 2.37.0-rc, with each version having its own documentation link.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eTransaction\u003c/code\u003e class supports regular value type operations such as copy, assign, and move, and also has copy and assign operators available.\u003c/p\u003e\n"]]],[],null,[]]
