This interface defines pure-virtual methods for each of the user-facing overload sets in Client. That is, all of Client's Read() overloads will forward to the one pure-virtual Read() method declared in this interface, and similar for Client's other methods. This allows users to inject custom behavior (e.g., with a Google Mock object) in a Client object for use in their own tests.
To create a concrete instance that connects you to a real Spanner database, see MakeConnection().
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22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 page provides documentation for the \u003ccode\u003eConnection\u003c/code\u003e class in the Google Cloud Spanner C++ library, detailing its role as a core interface for database interactions.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eConnection\u003c/code\u003e interface defines pure-virtual methods that mirror the user-facing overload sets in the \u003ccode\u003eClient\u003c/code\u003e class, enabling custom behavior injection and testing through methods like \u003ccode\u003eRead()\u003c/code\u003e, \u003ccode\u003eExecuteQuery()\u003c/code\u003e, and \u003ccode\u003eCommit()\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe document provides details about different available versions, with the latest release candidate being 2.37.0-rc and previous releases like 2.29.0 all the way back to version 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMakeConnection()\u003c/code\u003e function, which can be found elsewhere, is used to create a real connection to the Spanner database.\u003c/p\u003e\n"],["\u003cp\u003eEach of the virtual functions, such as \u003ccode\u003eRead()\u003c/code\u003e, \u003ccode\u003ePartitionRead()\u003c/code\u003e, \u003ccode\u003eExecuteQuery()\u003c/code\u003e, etc, correspond to client functions and have defined parameters, types and descriptions of returned data.\u003c/p\u003e\n"]]],[],null,[]]
