For connections to the server made using the legacy JDBC API (that is, not made using X DevAPI or X DevAPI for C), the default connection character set is now utf8mb4 rather than utf8. Connections to the server made using X DevAPI or X DevAPI for C continue to use the connection character set determined by the server. (Bug #28204677)

Connector/C++ 32-bit MSI packages are now available for Windows. These 32-bit builds enable use of the legacy JDBC connector. (WL #12262)

Connector/C++ compressed tar file packages are now available for Solaris.

It is also possible to build Connector/C++ from source on Solaris. For platform-specific build notes, see Building Connector/C++ Applications: Platform-Specific Considerations. (WL #11655)

Connector/C++ now provides connection pooling for applications using X Protocol. This capability is based on client objects, a new type of X DevAPI object. A client can be used to create sessions, which take connections from a pool managed by that client. For a complete description, see Connecting to a Single MySQL Server Using Connection Pooling.

X DevAPI example:

using namespace mysqlx;

Client cli("user:password@host_name/db_name", ClientOption::POOL_MAX_SIZE, 7);
Session sess = cli.getSession();

// use sess as before

cli.close();  // close session sess

X DevAPI for C example:

char error_buf[255];
int  error_code;

mysqlx_client_t *cli
 = mysqlx_get_client_from_url(
     "user:password@host_name/db_name", "{ \"maxSize\": 7 }", error_buf, &error_code
   );
mysqlx_session_t *sess = mysqlx_get_session_from_client(cli);

// use sess as before

mysqlx_close_client(cli);  // close session sess

(WL #11929)

For X DevAPI, a new connect-timeout option can be specified in connection strings or URIs to indicate a connection timeout in milliseconds. The SessionSettings::Options object supports a new CONNECT_TIMEOUT option.

For X DevAPI for C, the mysqlx_opt_type_t constant is MYSQLX_OPT_CONNECT_TIMEOUT together with the OPT_CONNECT_TIMEOUT() macro.

If no timeout option is specified, the default is 10000 (10 seconds). A value of 0 disables the timeout. The following examples set the connection timeout to 10 milliseconds:

X DevAPI examples:

Session sess("user@host/db?connect-timoeut=10");

Session sess(..., SessionOption::CONNECT_TIMEOUT, 10, ...);

Session sess(
  ...,
  SessionOption::CONNECT_TIMEOUT, std::chrono::milliseconds(10),
  ...
);

X DevAPI for C example:

mysqlx_session_options_t *opt = mysqlx_session_options_new();
mysqlx_session_option_set(opt, ..., OPT_CONNECT_TIMEOUT(10), ...);

(WL #12148)

JSON: Connector/C++ now uses RapidJSON for improved performance of operations that involve parsing JSON strings. There are no user-visible API changes for X DevAPI or X DevAPI for C. (WL #12292)

On SLES 15, Connector/C++ installation failed if libmysqlcppcon7 was already installed. (Bug #28658120)

Applications that were statically linked to the legacy JDBC connector could encounter a read access violation at exit time due to nondeterministic global destruction order. (Bug #28525266, Bug #91820)

Configuring with -DCMAKE_BUILD_TYPE=Release did not work on Linux. (Bug #28045274)

Field references in .having() expressions could be interpreted incorrectly and produce errors. (Bug #26310713)