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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.
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson const &
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson &&
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 Descriptions std::string
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson const &
Json & operator=(Json &&)
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson &&
Json & operator std::string() const &
Conversion to a JSON-formatted string.
operator std::string() &&Conversion to a JSON-formatted string.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The content details the `Json` class within the Google Cloud Spanner C++ library, which represents a JSON value."],["`Json` values are constructed from or converted to a `std::string`, allowing for seamless integration with string-based operations."],["The interface provides multiple constructors for creating `Json` values, including from a formatted string, and supports move and copy operations, but the string must be well-formatted as it lacks syntax checking."],["The webpage also lists a history of versions of the `Json` class, beginning at 2.11.0 and extending up to the latest version, which is 2.37.0-rc."],["`Json` objects can be compared for equality and streamed, and also converted to a string."]]],[]]
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