Error QMYSQL Plugin on Windows

[Stelian]

Maintenance Tool does not work, I get the next message: at least one valid and enabled repository required for this action to succeed
In the Maintenance Tool, start by selecting "Update components". Then click on the Settings button.
Then a Settings window will open and in there, then click the Repositories tab, click on User defined repositories, click on the Add button and type http://download.qt-project.org/online/qtsdkrepository/windows_x86/desktop/tools_maintenance.
I tried many website but still I get the same message.

[SGaist]

So you used the offline installer ?

Anyway, there's not that many website: http://download.qt.io/official_releases/qt/ the single folder under the version folders contain the sources. Since you're on Windows get the .zip file.

[Stelian]

This post is deleted!

[Stelian]

I downloaded qt-everywhere-src-5.12.1 and from what I got from https://www.seppemagiels.com/blog/create-mysql-driver-qt5-windows#mysql_path_note, I renamed the folder to Sources instead of the long qt-everywhere-src-5.12.1.
I also placed it in the Qt folder was installed in. (C:\Qt\ Qt5.12.1)
Open cmd.exe, and enter the following commands:
c:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers>C:/Qt/Qt5.12.1/5.12.1/mingw73_64/bin/qmake -- MYSQL_INCDIR=C:/MySQL/include "MYSQL_LIBDIR=C:/Program Files/MYSQL/MySQL Server 8.0/lib/libmysql.lib" mysql.pro
and again ... I'm disappointed

[SGaist]

That line doesn't make sense, why are you trying to execute qmake inside the sqldrivers folder from your already installed Qt ? And why are you passing once the path without space for the includes and then the one with spaces for the libraries ?

[Stelian]

What is the right line ?
I have read the post from https://forum.qt.io/topic/92626/cant-connect-to-mysql-database-qmysql-driver-not-loaded/15 line by line but it doesn't fit.
Please, light me!

[Stelian]

I will start again.
On website https://doc.qt.io/qt-5/sql-driver.html#how-to-build-the-qmysql-plugin-on-windows
first line is: cd %QTDIR%\qtbase\src\plugins\sqldrivers wich for me is:
c:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers>

Now I'll go back to website
second line:
qmake -- MYSQL_INCDIR=C:\MySQL\include "MYSQL_LIBDIR=C:\MYSQL\MySQL Server <version>\lib\opt"

MYSQL_INCDIR is include folder from MySql folder
MYSQL_LIBDIR is lib folder from MySql folder

For me the second line it should be something like this

c:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers>qmake -- MYSQL_INCDIR=C:\Program Files\MySQL\MySQL Server 8.0\include "MYSQL_LIBDIR=C:\Program Files\MySQL\MySQL Server 8.0\include"
When I run this line I get an error: 'qmake' is not recognized as an internal or external command,
operable program or batch file.

Also I don't find the opt folder

[jsulm]

@Stelian You need to call qmake from the source code directory of Qt source code you downloaded, not from your installed Qt.
This is your Qt installation: c:\Qt\Qt5.12.1\5.12.1\mingw73_64\plugins\sqldrivers
Look again at the link you posted: c:\Qt\5.10.1\Src\qtbase\src\plugins\sqldrivers is used there (in your case version would be 5.12.1).

"'qmake' is not recognized as an internal or external command, operable program or batch file." - use absolute path to qmake.

[Stelian]

@jsulm Thank you for your reply.
I have modified the line with this one.c:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR=C:\Program Files\MySQL\MySQL Server 8.0\include "MYSQL_LIBDIR=C:\Program Files\MySQL\MySQL Server 8.0\lib" but I get the same error: "qmake' is not recognized as an internal or external command, operable program or batch file"

[SGaist]

Use the full path to the qmake executable or start a Qt enabled command line.

[Stelian]

Okay, another error.
I quit, error after error with QMYSQL driver.
I really like Qt, but I have no patience.
Thank you anyway for your help, SGaist and jsulm.

ERROR: Invalid command line parameter 'Files/MySQL/MySQL'.

c:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers>C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake -- MYSQL_INCDIR=C:/Program Files/MySQL/MySQL Server 8.0/include "MYSQL_LIBDIR=C:Program Files/MYSQL/MySQL Server 8.0/lib"

[jsulm]

@Stelian This error is unrelated to Qt: you have a path with spaces (good example for why you should avoid such paths!). You need to put such paths into "":

c:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers>C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Server 8.0/include" MYSQL_LIBDIR="C:Program Files/MYSQL/MySQL Server 8.0/lib"

"I have no patience" - well, one should have when developing software...

[J.Hilk]

@jsulm said in Error QMYSQL Plugin on Windows:

"I have no patience" - well, one should have when developing software...

maybe it's a typo and it's supposed to be patients, meaning als patients are gone and there's now more time on hand for developing software

:P

[Stelian]

@jsulm Thank you for reply!
I,ve run c:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers>C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Server 8.0/include" MYSQL_LIBDIR="C:Program Files/MYSQL/MySQL Server 8.0/lib"
and I get the next message:

Running configuration tests...
Done running configuration tests.

Configure summary:

Qt Sql Drivers:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... no
  PostgreSQL ............................. no
  SQLite2 ................................ no
  SQLite ................................. yes
    Using system provided SQLite ......... no
  TDS (Sybase) ........................... no

Qt is now configured for building. Just run 'mingw32-make'.
Once everything is built, you must run 'mingw32-make install'.
Qt will be installed into 'C:\Qt\Qt5.12.1\5.12.1\mingw73_64'.

And I,ve run mingw32-make

'mingw32-make' is not recognized as an internal or external command,
operable program or batch file.

Do I have to add the path to make.exe in environment variables ?
But I don't find de make.exe file.
What else do I have to do ?

[jsulm]

@Stelian Use whole path to mingw-make

[Stelian]

I,ve looked foe mingw-make.exe file into C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin
I don't find it.
Do I have to follow next steps ?

uninstall your current MinGW installation
reinstall MinGW and select the following option in the setup dialog
a) Custom
b) Compilers C & C++
c) MSYS
extend your PATH environment variable in the System Properties / Environment Variables dialog of windows by adding C:\MinGW\msys\1.0\bin;C:\MinGW\bin; in front of the values that are already there
restart machine

[jsulm]

@Stelian It should be in c:\Qt\Tools\mingw730_64\bin

[Stelian]

@jsulm I've run the full path to mingw32-make c:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers>c:\Qt\Qt5.12.1\Tools\mingw730_64\bin\mingw32-make

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 ) && c:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile
mingw32-make[1]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
c:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile.Release all
mingw32-make[2]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
g++ -c -fno-keep-inline-dllexport -O2 -std=c++1z -fno-exceptions -Wall -W -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DNDEBUG -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -IC:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1\QtCore -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore -I.moc\release -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-winx64\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\mkspecs\win32-g++  -o .obj\release\qsql_sqlite.o qsql_sqlite.cpp
g++: error: CreateProcess: No such file or directory
mingw32-make[2]: *** [Makefile.Release:377: .obj/release/qsql_sqlite.o] Error 1
mingw32-make[2]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[1]: *** [Makefile:42: release-all] Error 2
mingw32-make[1]: Leaving directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make: *** [Makefile:43: sub-sqlite-make_first] Error 2

[Stelian]

Meanwhile, I added c:\Qt\Qt5.12.1\Tools\mingw730_64\bin\mingw32-make in PATH environment variable in the System Properties and restart the computer and I've run again

c:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers>C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Server 8.0/include" MYSQL_LIBDIR="C:Program Files/MYSQL/MySQL Server 8.0/lib"

c:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers>c:\Qt\Qt5.12.1\Tools\mingw730_64\bin\mingw32-make

and I get ...

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 ) && c:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile
mingw32-make[1]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
c:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile.Release all
mingw32-make[2]: Entering directory 'c:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite'
g++ -c -fno-keep-inline-dllexport -O2 -std=c++1z -fno-exceptions -Wall -W -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DNDEBUG -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -IC:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1\QtCore -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore -I.moc\release -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-winx64\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\mkspecs\win32-g++  -o .obj\release\qsql_sqlite.o qsql_sqlite.cpp
g++ -fno-keep-inline-dllexport -O2 -std=c++1z -fno-exceptions -Wall -W -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -dM -E -o .moc\release\moc_predefs.h C:\Qt\Qt5.12.1\5.12.1\mingw73_64\mkspecs\features\data\dummy.cpp
C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\moc.exe -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DNDEBUG -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB --include C:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite/.moc/release/moc_predefs.h -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/mkspecs/win32-g++ -IC:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite -IC:/Qt/Qt5.12.1/Sources/qtbase/src/3rdparty/sqlite -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtSql/5.12.1 -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtSql/5.12.1/QtSql -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtCore/5.12.1 -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtCore/5.12.1/QtCore -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtSql -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtCore -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include/c++ -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include/c++/x86_64-w64-mingw32 -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include/c++/backward -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include-fixed -IC:/Qt/Qt5.12.1/Tools/mingw730_64/x86_64-w64-mingw32/include smain.cpp -o .moc\release\smain.moc
g++ -c -fno-keep-inline-dllexport -O2 -std=c++1z -fno-exceptions -Wall -W -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DNDEBUG -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -IC:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1\QtCore -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore -I.moc\release -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-winx64\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\mkspecs\win32-g++  -o .obj\release\smain.o smain.cpp
gcc -c -fno-keep-inline-dllexport -O2 -std=gnu11 -fno-exceptions -Wall -W -Wextra -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DNDEBUG -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -IC:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1\QtCore -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore -I.moc\release -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-winx64\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\mkspecs\win32-g++  -o .obj\release\sqlite3.o C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c: In function 'sqlite3ThreadJoin':
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c:29362:8: warning: variable 'bRc' set but not used [-Wunused-but-set-variable]
   BOOL bRc;
        ^~~
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c: In function 'winUnfetch':
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c:44948:45: warning: unused parameter 'iOff' [-Wunused-parameter]
 static int winUnfetch(sqlite3_file *fd, i64 iOff, void *p){
                                             ^~~~
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c: In function 'sqlite3_db_status':
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c:20744:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
       op = SQLITE_DBSTATUS_CACHE_WRITE+1;
       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c:20746:5: note: here
     case SQLITE_DBSTATUS_CACHE_HIT:
     ^~~~
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c: In function 'sqlite3_str_vappendf':
C:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite\sqlite3.c:27452:19: warning: this statement may fall through [-Wimplicit-fallthrough=]
         flag_long = sizeof(char*)==sizeof(i64) ? 2 :
         ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                      sizeof(char*)==sizeof(long int) ? 1 : 0;
...
...
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C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\moc.exe -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB --include C:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite/.moc/debug/moc_predefs.h -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/mkspecs/win32-g++ -IC:/Qt/Qt5.12.1/Sources/qtbase/src/plugins/sqldrivers/sqlite -IC:/Qt/Qt5.12.1/Sources/qtbase/src/3rdparty/sqlite -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtSql/5.12.1 -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtSql/5.12.1/QtSql -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtCore/5.12.1 -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtCore/5.12.1/QtCore -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtSql -IC:/Qt/Qt5.12.1/5.12.1/mingw73_64/include/QtCore -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include/c++ -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include/c++/x86_64-w64-mingw32 -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include/c++/backward -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include -IC:/Qt/Qt5.12.1/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include-fixed -IC:/Qt/Qt5.12.1/Tools/mingw730_64/x86_64-w64-mingw32/include qsql_sqlite_p.h -o .moc\debug\moc_qsql_sqlite_p.cpp
g++ -c -fno-keep-inline-dllexport -g -Og -std=c++1z -fno-exceptions -Wall -W -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -IC:\Qt\Qt5.12.1\Sources\qtbase\src\3rdparty\sqlite -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql\5.12.1\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1 -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore\5.12.1\QtCore -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtSql -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\include\QtCore -I.moc\debug -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-winx64\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\Qt5.12.1\5.12.1\mingw73_64\mkspecs\win32-g++  -o .obj\debug\moc_qsql_sqlite_p.o .moc\debug\moc_qsql_sqlite_p.cpp
windres -i qsqlited_resource.rc -o .obj\debug\qsqlited_resource_res.o --include-dir=. -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DSQLITE_ENABLE_COLUMN_METADATA -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB
g++ -shared -Wl,-subsystem,windows -Wl,--out-implib,C:\Qt\Qt5.12.1\Sources\qtbase\src\plugins\sqldrivers\plugins\sqldrivers\libqsqlited.a -o ..\plugins\sqldrivers\qsqlited.dll .obj/debug/qsql_sqlite.o .obj/debug/smain.o .obj/debug/sqlite3.o .obj/debug/moc_qsql_sqlite_p.o  -LC:\openssl\lib -LC:\Utils\my_sql\mysql-5.6.11-winx64\lib -LC:\Utils\postgresql\pgsql\lib -LC:\Qt\Qt5.12.1\5.12.1\mingw73_64\lib C:\Qt\Qt5.12.1\5.12.1\mingw73_64\lib\libQt5Sqld.a C:\Qt\Qt5.12.1\5.12.1\mingw73_64\lib\libQt5Cored.a .obj\debug\qsqlited_resource_res.o
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'

[Stelian]

When I've run a simple program

#include <QCoreApplication>
#include <QtSql>
#include <QSqlDatabase>
#include <QtDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setUserName("root");
    db.setPassword("DSa81&l12&z26");
    db.setDatabaseName("Employee_management");

    if (db.open())
    {
        qDebug() << "Database connected successfuly!";
    }
    else
    {
        qDebug() << "Database is not connected!";
    }

    return a.exec();
}

I receive the message "Database is not connected!", which means there are still some blurring about the QMYSQL driver.