While both classes share the same, thin client-side API, JsonB stores the data in a decomposed, binary format, whereas Json stores an exact copy of the RFC 7159 text.
This means that JsonB is slower to input, but faster to process as it avoids reparsing. Therefore, applications that utilize the structured state of a JSON value should prefer JsonB.
It also means that the JsonB stored representation does NOT preserve:
white space,
the order of object keys, or
duplicate object keys.
Note: JsonB is only applicable to PostgreSQL databases (i.e., those created using DatabaseDialect::POSTGRESQL).
Constructors
JsonB(JsonB const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
JsonB const &
JsonB(JsonB &&)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
JsonB &&
JsonB()
A null value.
JsonB(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=(JsonB const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
JsonB const &
Returns
Type
Description
JsonB &
operator=(JsonB &&)
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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22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 webpage details the \u003ccode\u003eJsonB\u003c/code\u003e class in the Google Cloud Spanner C++ client library, focusing on its functionality and usage across various versions.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e stores data in a binary format optimized for faster processing, in contrast to the \u003ccode\u003eJson\u003c/code\u003e class, which stores the exact JSON text.\u003c/p\u003e\n"],["\u003cp\u003eWhile faster to process, \u003ccode\u003eJsonB\u003c/code\u003e has slower input speeds, and does not preserve whitespace, object key order, or duplicate keys from the original JSON.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eJsonB\u003c/code\u003e class is specifically designed for use with PostgreSQL databases within Spanner, and supports standard operations such as copy, assignment, move, and conversions to and from JSON-formatted strings.\u003c/p\u003e\n"],["\u003cp\u003eThe webpage lists available versions of \u003ccode\u003eJsonB\u003c/code\u003e, from 2.11.0 to the latest 2.37.0-rc, allowing users to navigate to documentation specific to each version.\u003c/p\u003e\n"]]],[],null,[]]
