Changes in MySQL Connector/C++ 8.0.13 (2018-10-22, General Availability)

• Legacy (JDBC API) Notes

• Packaging Notes

• X DevAPI Notes

• Functionality Added or Changed

• Bugs Fixed

Legacy (JDBC API) Notes

• 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)

Packaging Notes

• 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)

X DevAPI Notes

• 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:

  Press CTRL+C to copy
   
  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:

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  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:

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  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:

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

  (WL #12148)

Functionality Added or Changed

• 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)

Bugs Fixed

• 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)