Using mysql database

[raymadigan]

I am new to Qt and am trying to use the mysql database on a windows installation. I have already spent too much time and can't sort it out.

I have QTPLUGIN += qsqlmysql and QT += sql in the .pro file. When I load the project I get a message. two of them that it is redundant. It isn't any better when I leave the line out. I checked in the plugin directory and it is there.

I also have the -llibmysql entry added to the LIBS's path
win32:CONFIG(release, debug|release): LIBS += -L"C:/Program Files/MariaDB 10.1/lib/" -llibmysql

The application seems to build correctly.

my database access is copied from somewhere:


bool createConnection()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
db.setHostName("localhost");
db.setDatabaseName("testdb");
db.setUserName("root");
db.setPassword("rmsipw");
if (!db.open()) {
qDebug() << "Database error occurred";
return false;
}
return true;
}


when it runs I get:
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QODBC QODBC3
Database error occurred
Not Connected:

Edit:
It is way more complicated then this: My application wants to compile with an old version of mingw on my machine. Even though the default kit is Desktop Qt 5.7.0 MSVC2013 64bit is the default Kit?

[ChrisW67]

You should not need the LIBS entry, but you will need the Mysql client library (part of MariaDB/MySql) in the PATH or the same folder as the executable so Windows can find it when Qt tries to load the Qt plugin. The file is named something like libmysql.dll.

[raymadigan]

Thanks for your help. I remove the lib entry. I really should have spent a little more time, I solved the problem and will make the thread solved. I used the QT_DEBUG_PLUGINS=1 and found out the real problem was it was using the wrong toolchain. Once I got past that issue it works great.