Changes in MySQL Connector/ODBC 9.4.0 (2025-07-22, General Availability)

Note

These release notes were created with the assistance of MySQL HeatWave GenAI.

Bugs Fixed

• .NET applications quit unexpectedly while trying to connect to a MySQL server using Connector/ODBC. This has been fixed by compiling C/ODBC and MySQL (this affects the behaviors of the libmysql client library) with the environmental variable _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR set for CMake. See Build Steps for details. (Bug #37845086)

• The commercial Debian package installed some of the documentation files under the wrong folders. Those files are now put under ./usr/share/doc/mysql-connector-odbc-commercial/ as expected. (Bug #37771319)

• Company name and other pieces of information were missing when the Connector/ODBC DLLs were examined by, for example, choosing its Properties in the Windows Explorer and looking at the Details tab. (Bug #37199170)

• A memory leak occurred when there was an error with my_pos_update(). This has been fixed now by proper error handing and statement deallocations. (Bug #18532085)