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MySQL Connector/C++ 8.0.21 has been released
Posted by: Jocelyn Ramilison
Date: July 13, 2020 05:41AM

Dear MySQL users,

MySQL Connector/C++ 8.0.21 is a new release version of the MySQL
Connector/C++ 8.0 series.

Connector/C++ 8.0 can be used to access MySQL implementing Document
Store or in a traditional way, using SQL queries. It allows writing
both C++ and plain C applications using X DevAPI and X DevAPI for C.
It also supports the legacy API of Connector/C++ 1.1 based on JDBC4.

To learn more about how to write applications using X DevAPI, see
"X DevAPI User Guide" at

  https://dev.mysql.com/doc/x-devapi-userguide/en/

See also "X DevAPI Reference" at

  https://dev.mysql.com/doc/dev/connector-cpp/devapi_ref.html

and "X DevAPI for C Reference" at

  https://dev.mysql.com/doc/dev/connector-cpp/xapi_ref.html

For generic information on using Connector/C++ 8.0, see

  https://dev.mysql.com/doc/dev/connector-cpp/

For general documentation about how to get started using MySQL
as a document store, see

  http://dev.mysql.com/doc/refman/8.0/en/document-store.html

To download MySQL Connector/C++ 8.0.21, see the "General Availability (GA)
Releases" tab at

  https://dev.mysql.com/downloads/connector/cpp/

Changes in MySQL Connector/C++ 8.0.21 (2020-07-13, General Availability)

Configuration Notes


     * The CMake configuration files were revised to work better
       when Connector/C++ is used as a subproject of application
       projects. Thanks to Lou Shuai for the contribution.
       This revision does not change the fact that the intended
       (and supported) usage scenario is to build the connector
       in a separate project, install it somewhere and then use
       it in application projects from that installed location
       (for example, by defining the imported library target in
       CMake). (Bug #31095993, Bug #99093)

JSON Notes


     * The rapidjson library included with Connector/C++ has
       been upgraded to the GitHub snapshot of 16 January 2020.

Security Notes


     * For platforms on which OpenSSL libraries are bundled, the
       linked OpenSSL library for Connector/C++ has been updated
       to version 1.1.1g. Issues fixed in the new OpenSSL
       version are described at
       https://www.openssl.org/news/cl111.txt and
       https://www.openssl.org/news/vulnerabilities.html. (Bug
       #31296689)

X DevAPI Notes


     * For X DevAPI or X DevAPI for C applications, methods and
       functions that create or modify collections now accept
       options to enable validation of a JSON schema that
       documents must adhere to before they are permitted to be
       inserted or updated. Schema validation is performed by
       the server, which returns an error message if a document
       in a collection does not match the schema definition or
       if the server does not support validation.
       These new classes are implemented to support validation
       options:

          + CollectionOptions: The base class that has all
            options. Contains an Option enumeration with
            constants REUSE and VALIDATION.

          + CollectionValidation: Handles only subkey
            validation. Contains a Level enumeration with
            constants STRICT and OFF, and an Option enumeration
            with constants SCHEMA and LEVEL.
       X DevAPI now has these signatures for createCollection()
       (and modifyCollection()):
       // Accepts the full document
       createCollection("name", "JSON_Document");

       // DbDoc usage is also permitted
       createCollection("name", DbDoc("validation", DbDoc("level","off",...)));

       // List of pairs with Option enum constant and value
       createCollection(CollectionOptions::REUSE, true,
                 CollectionOptions::VALIDATION, CollectionValidation(...));

       // Old REUSE way is also acceptable
       createCollection("name", true);

       createCollection("name", CollectionValidation(...));

       // createCollection also allows a list of pairs of
       // CollectionValidation Option enum constant and value
       createCollection("name", CollectionOptions::VALIDATION,
                         CollectionValidation::OFF,
                         CollectionValidation::SCHEMA,
                         "Object");

       X DevAPI for C examples:
       These are the possible options for
       mysqlx_collection_options_set():
       OPT_COLLECTION_VALIDATION_LEVEL(VALIDATION_OFF)
       OPT_COLLECTION_VALIDATION_SCHEMA("Object")
       OPT_COLLECTION_REUSE(true)

       Perform option operations like this:
       mysqlx_collection_options_t *options = mysqlx_collection_options_new() //creates collection options object
       mysqlx_free(options) //frees collection options
       mysqlx_collection_options_set(options,...);

       Creation and modification functions have these signatures:
       mysqlx_collection_create_with_options(mysqlx_schema_t *schema, mysqlx_collection_options_t *options);

       mysqlx_collection_create_with_json_options(mysqlx_schema_t *schema, const char* json_options);

       mysqlx_collection_modify_with_options(mysqlx_schema_t *schema, mysqlx_collection_options_t *options);

       mysqlx_collection_modify_with_json_options(mysqlx_schema_t *schema, const char* json_options);

       For modifications, the REUSE option is not supported and
       an error occurs if it is used.

Functionality Added or Changed


     * The MySQL_Connection_Options enumeration is no longer
       sensitive to the order in which the underlying options
       are declared in the C API source. (Bug #30799197)

     * Connector/C++ now implements blocking of failed
       connection-pool endpoints to prevent them from being
       reused until a timeout period has elapsed. This should
       reduce average wait time for applications to obtain a
       connection from the pool in the event that endpoints
       become temporarily unavailable.

Bugs Fixed


     * For applications that use the legacy JDBC API (that is,
       not X DevAPI or X DevAPI for C) on a system that does not
       have OpenSSL libraries installed, the libraries that are
       bundled with Connector/C++ could not be found when
       resolving run-time dependencies of the application. (Bug
       #31007317)

     * For a reply with multiple result sets (such as the result
       from a stored procedure that executed multiple queries),
       an error in reply processing logic could incorrectly
       deregister the reply object after reading the first
       result set while more result sets from the server were
       pending, resulting in an application error. (Bug
       #30989042) 
On Behalf of Oracle/MySQL Release Engineering Team,
Hery Ramilison 

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