Error QMYSQL Plugin on Windows

SGaist

Did you call mingw32-make install after the build succeeded ?

Stelian

Yes, and I received the next message

cd odbc\ && ( if not exist Makefile C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -o Makefile C:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers\odbc\odbc.pro ) && mingw32-make -f Makefile install
mingw32-make[1]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make -f Makefile.Release install
mingw32-make[2]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/odbc'
copy /y ..\plugins\sqldrivers\qsqlodbc.dll C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlodbc.dll
        1 file(s) copied.
C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -install qinstall C:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake C:\Qt\Qt5.12.1\5.12.1\mingw73_64\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake
mingw32-make[2]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make -f Makefile.Debug install
mingw32-make[2]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/odbc'
copy /y ..\plugins\sqldrivers\qsqlodbcd.dll C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlodbcd.dll
        1 file(s) copied.
C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -install qinstall C:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake C:\Qt\Qt5.12.1\5.12.1\mingw73_64\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake
mingw32-make[2]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make[1]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/odbc'
cd sqlite\ && ( if not exist Makefile C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -o Makefile C:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers\sqlite\sqlite.pro ) && mingw32-make -f Makefile install
mingw32-make[1]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make -f Makefile.Release install
mingw32-make[2]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
copy /y ..\plugins\sqldrivers\qsqlite.dll C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlite.dll
        1 file(s) copied.
C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -install qinstall C:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers\lib\cmake\Qt5Sql\Qt5Sql_QSQLiteDriverPlugin.cmake C:\Qt\Qt5.12.1\5.12.1\mingw73_64\lib\cmake\Qt5Sql\Qt5Sql_QSQLiteDriverPlugin.cmake
mingw32-make[2]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make -f Makefile.Debug install
mingw32-make[2]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
copy /y ..\plugins\sqldrivers\qsqlited.dll C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlited.dll
        1 file(s) copied.
C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -install qinstall C:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers\lib\cmake\Qt5Sql\Qt5Sql_QSQLiteDriverPlugin.cmake C:\Qt\Qt5.12.1\5.12.1\mingw73_64\lib\cmake\Qt5Sql\Qt5Sql_QSQLiteDriverPlugin.cmake
mingw32-make[2]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[1]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'

Part of this message is in my previous post

Stelian

When I run the code

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
Database is Not Connected!

SGaist

In Qt Creator's Run part of the Project panel, did you add the path to the MySQL dlls in the PATH environment variable ?

Stelian

@SGaist Let me understand.
First of all, do you mean I have to add that path "C:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib" or this path "C:\Program Files\MySQL\MySQL Server 8.0\lib"
Second of all, where do I have to add ? (see picture1 and picture2) ?

jsulm

@Stelian As @SGaist wrote: in QtCreator Run settings.
I think you need the MySQL connector libs (but you can simply put both).

Stelian

@jsulm Where do I have to add in the first picture or second ?

jsulm

@Stelian In the second of course as it is showing exactly what was suggested: Run settings in QtCreator.

Stelian

@jsulm I,ve added both C:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib" and this path "C:\Program Files\MySQL\MySQL Server 8.0\lib in Run Settings -> Run Environment -> Path, then restart Qt and run the code, Not connected.

SGaist

Then again, start your application with the QT_DEBUG_PLUGINS environment variable to see what is happening.

Stelian

@SGaist

QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlite.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlite.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "archreq": 0,
    "className": "QSQLiteDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlite.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlited.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlited.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "archreq": 1,
    "className": "QSQLiteDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QSQLITE")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 0,
    "className": "QMYSQLDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 1,
    "className": "QMYSQLDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QMYSQL3", "QMYSQL")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbc.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbc.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "archreq": 0,
    "className": "QODBCDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbc.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbcd.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbcd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "archreq": 1,
    "className": "QODBCDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QODBC3", "QODBC")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsql.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "archreq": 0,
    "className": "QPSQLDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsql.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsqld.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsqld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "archreq": 1,
    "className": "QPSQLDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QPSQL7", "QPSQL")
QFactoryLoader::QFactoryLoader() checking directory path "E:/Qt Creator/build-sql_console_test-Desktop_Qt_5_12_1_MinGW_64_bit-Debug/debug/sqldrivers" ...
Cannot load library C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlmysqld.dll: The specified module could not be found.
QLibraryPrivate::loadPlugin failed on "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll" : "Cannot load library C:\\Qt\\Qt5.12.1\\5.12.1\\mingw73_64\\plugins\\sqldrivers\\qsqlmysqld.dll: The specified module could not be found."
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
Database is Not Connected!

SGaist

Looks like you only built the plugin for release and not for debug and you are running a debug build of your application.

Stelian

@SGaist I do not know if I built the plugin for release and not for debug, but if you say that I did, ok, you are the champion.
Tell me what I have to do next.

Stelian

@SGaist Believe me, I don't know how to build a plugin in release mode or in debug mode, to my shame.
If I did that, I did it unconsciously.

SGaist

Add -debug to the qmake call

Stelian

@SGaist I've called the qmake in debug mode, run the code and again Database is Not Connected!
Then again, I have start the application with the QT_DEBUG_PLUGINS environment variable and I get the next message

QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlite.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlite.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "archreq": 0,
    "className": "QSQLiteDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlite.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlited.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlited.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "archreq": 1,
    "className": "QSQLiteDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QSQLITE")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 0,
    "className": "QMYSQLDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 1,
    "className": "QMYSQLDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QMYSQL3", "QMYSQL")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbc.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbc.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "archreq": 0,
    "className": "QODBCDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbc.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbcd.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlodbcd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "archreq": 1,
    "className": "QODBCDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QODBC3", "QODBC")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsql.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "archreq": 0,
    "className": "QPSQLDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsql.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsqld.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlpsqld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "archreq": 1,
    "className": "QPSQLDriverPlugin",
    "debug": true,
    "version": 330752
}

Got keys from plugin meta data ("QPSQL7", "QPSQL")
QFactoryLoader::QFactoryLoader() checking directory path "E:/Qt Creator/build-sql_console_test-Desktop_Qt_5_12_1_MinGW_64_bit-Debug/debug/sqldrivers" ...
Cannot load library C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlmysqld.dll: The specified module could not be found.
QLibraryPrivate::loadPlugin failed on "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll" : "Cannot load library C:\\Qt\\Qt5.12.1\\5.12.1\\mingw73_64\\plugins\\sqldrivers\\qsqlmysqld.dll: The specified module could not be found."
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
Database is Not Connected!

JonB

@Stelian

Cannot load library C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlmysqld.dll: The specified module could not be found.

Does the exact file specified by that path actually exist, or not? (Note that the file mentioned, qsqlmysqld.dll, has a d just before the ., presumably indicating it's a debug build; this is not the same as if it were qsqlmysql.dll.)

Stelian

@JonB Thank you for reply!
I apologize for answering late, but that file is right in that location:

C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlmysqld.dll

See the print 0_1551538547607_Annotation 2019-03-02 165509.jpg screen.

SGaist

To reduce the output, can you move out of that folder all .dll files that are not related to MySQL ?

Stelian

@SGaist I removed the non-MySQL files
Here is the output

QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 0,
    "className": "QMYSQLDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysql.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll"
Found metadata in lib C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 1,
    "className": "QMYSQLDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QMYSQL3", "QMYSQL")
QFactoryLoader::QFactoryLoader() checking directory path "E:/Qt Creator/build-sql_console_test-Desktop_Qt_5_12_1_MinGW_64_bit-Debug/debug/sqldrivers" ...
Cannot load library C:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers\qsqlmysqld.dll: The specified module could not be found.
QLibraryPrivate::loadPlugin failed on "C:/Qt/Qt5.12.1/5.12.1/mingw73_64/plugins/sqldrivers/qsqlmysqld.dll" : "Cannot load library C:\\Qt\\Qt5.12.1\\5.12.1\\mingw73_64\\plugins\\sqldrivers\\qsqlmysqld.dll: The specified module could not be found."
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QMYSQL QMYSQL3
Database is Not Connected!

Same file qsqlmysqld.dll