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PyQt5 and MySQL or Postgres



  • Hi,

    I am new to the forum and to using PyQt5

    I am using PyCharm, Python 3.8 on windows 10, MySQL 8.0 CE, Postgres 13. QT 5.15.1.

    I wanted to experiment a bit with a database application. The example was made with SQlite, but I wanted to change this to either Postgres or MySQL, which are databases that I would like to use in the future for my needs. Now, after a few days of struggling, googling etc. I still do not know how to get this to work.

    When I try to open the connection to the database, I get a message 'Driver not loaded". In PyQt5, the MySQL driver is not even listed in available drivers. I am totally stuck. When I use mysql.connector, the connection is immediately established, but the problems are with QtSql.

    And I do not know anyone using PyQt with a database to get help!

    I would be grateful if someone could help me with this.



  • @Greg_ox
    Firstly, whenever you get 'Driver not loaded" message, set Windows environment variable via set QT_DEBUG_PLUGINS=1 and then run, you will diagnostic information about what Qt is looking for where.

    I used PyQt5 on an app for both Linux & Windows, but I was not responsible for getting it working on Windows. Under Linux you have to apt-get a Python/PyQt5 plug-in library for each database driver. You have to do the same under Windows, but I'm not sure of the names. I think the file you might need is qsqlmysql.dll, maybe in somewhere like C:\Python37\Lib\site-packages\PyQt5\Qt\plugins\sqldrivers\.


  • Lifetime Qt Champion

    Hi and welcome to devnet,

    You are likely using a recent version of PyQt5. Currently, the MySQL plugin is not provided anymore by the pre-built versions of Qt due to licensing changes from Oracle. If you want to keep things simple and since it looks like an option, go with PostgreSQL.


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