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Showing content from https://cloud.google.com/cpp/docs/reference/spanner/2.39.0/classgoogle_1_1cloud_1_1spanner_1_1JsonB below:

Class JsonB (2.39.0) | C++ Client Libraries

Skip to main content Class JsonB (2.39.0)

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JsonB is a variant of Json (see above).

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:

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.

Parameter Name Description JsonB &&
Returns Type Description JsonB & 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.

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