Set-up MariaDB library file location programmatically?

[JonB]

@jsulm
I could be wrong, but I think in this case it won't help? That is good if the QMYSQL driver not loaded is among the available drivers, but here OP has not got that far, I don't think he has managed to install the driver?

[jsulm]

@JonB Yes, you're right. It looks like the driver is not available at all.

[SPlatten]

Is there anything you need from me in terms of information?

This is from the folder:

/usr/local/Cellar/mariadb/10.4.6_1/lib

ls -l:

-rw-r--r--   1 simonplatten  staff  230704 28 Sep  2019 libmariadb.3.dylib
lrwxr-xr-x   1 simonplatten  staff      18 17 Jun  2019 libmariadb.dylib -> libmariadb.3.dylib
-rw-r--r--   1 simonplatten  staff  336264 17 Jun  2019 libmariadbclient.a
lrwxr-xr-x   1 simonplatten  staff      18 17 Jun  2019 libmysqlclient.a -> libmariadbclient.a
lrwxr-xr-x   1 simonplatten  staff      18 17 Jun  2019 libmysqlclient.dylib -> libmariadb.3.dylib
lrwxr-xr-x   1 simonplatten  staff      18 17 Jun  2019 libmysqlclient_r.a -> libmariadbclient.a
lrwxr-xr-x   1 simonplatten  staff      18 17 Jun  2019 libmysqlclient_r.dylib -> libmariadb.3.dylib
-r--r--r--   1 simonplatten  staff   12400 17 Jun  2019 libmysqlservices.a
drwxr-xr-x   3 simonplatten  staff      96 28 Sep  2019 pkgconfig
drwxr-xr-x  49 simonplatten  staff    1568 17 Jun  2019 plugin

[jsulm]

@SPlatten I think you need to build Qt MySQL plug-in first.

[SPlatten]

Thank you, do you have a link that details how?

I'm downloading the MariaDB ODBC driver for MAC now or is this not the same?

mariadb-connector-odbc-3.1.9-osx-x86_64

[jsulm]

@SPlatten https://doc.qt.io/qt-5/sql-driver.html
https://stackoverflow.com/questions/6483523/qt-how-to-getcompile-mysql-driver

[SPlatten]

@jsulm , thank you.

So already I'm struggling with the answer on: https://stackoverflow.com/questions/6483523/qt-how-to-getcompile-mysql-driver

I cannot find the driver sources, my Qt path looks like this:

/Users/simonplatten/qt/5.14.2/Src

There is no plugins folder in there, the only plugins folder is:

/Users/simonplatten/qt/5.14.2/clang_64/plugins

That doesn't contain a mysql folder. I just did:

sudo find / -name sqldrivers/mysql

Nothing was found on my system.

I've tried to follow the instructions on https://doc.qt.io/qt-5/sql-driver.html#qmysql
I fall at the first hurdle, I don't have the environment variable QTDIR set and I think my installation of MariaDB is complicated by the fact it was installed using Homebrew.

[jsulm]

@SPlatten said in Set-up MariaDB library file location programmatically?:

I cannot find the driver sources

Did you install Qt sources?

[SPlatten]

@jsulm, I don't think so, how do I do that?

[jsulm]

@SPlatten said in Set-up MariaDB library file location programmatically?:

how do I do that?

If you used online installer you can use Maintenance Tool...

[SPlatten]

@jsulm , I did exactly that before posting my reply, I didn't see any option in it for source code.

[jsulm]

@SPlatten https://www.qt.io/download-open-source

[SPlatten]

@jsulm , I'm confused now, the link posted is to the Open source page. What if I don't intend my application to be open source, once its completed I intend to purchase a license before distribution. Can I build a mySQL driver for Qt without open source?

[jsulm]

@SPlatten said in Set-up MariaDB library file location programmatically?:

once its completed I intend to purchase a license before distribution

I'm not sure QtCompany will agree with that.
You should contact them.

There are many ways to get the source code. For example here: https://download.qt.io/archive/qt/5.15/5.15.0/single/
Or using Git as described here: https://wiki.qt.io/Get_the_Source

[hskoglund]

Hi, it might be easier if you use Qt's ODBC plugin (libqsqlodbc.dylib) together with the MariaDB Connector/ODBC

[SPlatten]

@jsulm , if I'm developing it on my own system and no one else is involved or using it, how would this be against any license?

[SPlatten]

@hskoglund , thank you, I'll look into it. It seems its available for just about every operating system except MAC.

[jsulm]

@SPlatten I'm not a lawyer and not working for QtCompany (that's why I suggested to ask the company).
You say: you are now developing an app and you want to release it later as closed source. And you want to buy Qt license when you want to release the app. My point was: QtCompany could say that you actually need the commercial license from the beginning as you're developing a closed source application which is going to be distributed. I may be wrong here, but it is worth checking.

If you're not going to distribute your app then there is no issue.

[SPlatten]

@jsulm , thank you, I'll send Qt an email. Contacting Qt to ask such a question is easier said than done...How do I contact the appropriate person or department in Qt to ask?

https://www.qt.io/contact-qt-services-team

Query sent to Qt.

[JonB]

@SPlatten said in Set-up MariaDB library file location programmatically?:

That doesn't contain a mysql folder. I just did:
sudo find / -name sqldrivers/mysql

Nothing was found on my system.

I realize this is probably not your issue here, but I think you ought be aware, at least for future searches, that -name abc/def --- with that / --- will always return false, so you'll never find a match.

On MacOS (I'm Ubuntu) I think you'll find you would have to use -path instead, plus you want a substring match, so you would need e.g.:

sudo find / -path '*sqldrivers/mysql' -print

P.S.
Don't forget the -print which you didn't show you used, else find is remarkably silent ;-)