A simple representation for the Spanner JSON type: a lightweight, text-based, language-independent data interchange format.
JSON (the JavaScript Object Notation) defines a small set of formatting rules for the portable representation of structured data. See RFC 7159.
A Json value can be constructed from, and converted to a std::string. Json values can be compared (by string) for equality, and streamed.
There is no syntax checking of JSON strings in this interface. The user is expected to only construct Json values from well-formatted strings.
Constructors
Json(Json const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
Json const &
Json(Json &&)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
Json &&
Json()
A null value.
Json(std::string)
Construction from a JSON-formatted string.
Note that there is no check here that the argument string is indeed well-formatted. Error detection will be delayed until the value is passed to Spanner.
Parameter
Name
Description
s
std::string
Operators
operator=(Json const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
Json const &
Returns
Type
Description
Json &
operator=(Json &&)
Regular value type, supporting copy, assign, move.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22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\u003eJson\u003c/code\u003e class within the Google Cloud Spanner C++ library, which represents a JSON value.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eJson\u003c/code\u003e class supports construction from and conversion to \u003ccode\u003estd::string\u003c/code\u003e, enabling easy interaction with JSON-formatted data.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eJson\u003c/code\u003e class offers several constructors, including one to make it a null value, and another to make it a \u003ccode\u003eJson\u003c/code\u003e based on a JSON-formatted string, and regular value types to copy and move.\u003c/p\u003e\n"],["\u003cp\u003eThe class provides operators for assignment and explicit conversion to \u003ccode\u003estd::string\u003c/code\u003e, and it facilitates comparison for equality (by string).\u003c/p\u003e\n"],["\u003cp\u003eThere is no immediate syntax validation for the JSON strings during construction; error detection is performed later when the value is transmitted to Spanner.\u003c/p\u003e\n"]]],[],null,[]]
