Set-up MariaDB library file location programmatically?

[SPlatten]

I'm developing on a MAC. I have MariaDB version 10.4.6 Homebrew installed on my MAC. This is installed in:

/usr/local/Cellar/mariadb/10.4.6_1

It looks like the library I need to reference is:

/usr/local/Cellar/mariadb/10.4.6_1/lib/libmariadb.dylib

Can anyone help me to set-up the mySQL / MariaDB driver as they are the same thing on a MAC?

If possible I'd like to incorporate this into my application and pass any configurable requirements or parameters via the command line.

Sorry about creating another thread, I did search the existing MYSQL for Qt thread, however its locked and I didn't see anything relevant for a MAC.

To be clear, when I launch my application I currently get:

Warning:QSqlDatabase: QMYSQL driver not loaded
Warning:QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7

I've tried:

install_name_tool -change /usr/local/Cellar/mariadb/10.4.6_1/lib/libmariadb.dylib /Users/simonplatten/Qt/5.14.2/clang_64/plugins/sqldrivers/libqsqlmysql.dylib

This results in:

Usage: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool [-change old new] ... [-rpath old new] ... [-add_rpath new] ... [-delete_rpath old] ... [-id name] input

[Bonnie]

Hey, Just in case...
Did you remove "config.cache" before you run qmake again?

[jsulm]

@SPlatten First thing in such situations is to start your app with QT_DEBUG_PLUGINS set (https://doc.qt.io/qt-5/deployment-plugins.html#debugging-plugins).
Also, this questions was asked here many many times, you should use the search function.

[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.