Cant connect to mysql database: QMYSQL driver not loaded

[cdwijs]

hi All,

I also have installed the "MySQL Connector C 6.1", but configure still does not see mySQL:

c:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR="c:\Program
 Files\MySQL\MySQL Connector C 6.1\lib"

Running configuration tests...
Done running configuration tests.

Configure summary:

Qt Sql:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... yes
  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, Qt is installed.
You should NOT run 'mingw32-make install'.
Note that this build cannot be deployed to other machines or devices.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.


c:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR="c:\Program
 Files\MySQL\MySQL Connector C 6.1\lib"
Info: creating stash file C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\.qmake.
stash

Running configuration tests...
Checking for DB2 (IBM)... no
Checking for InterBase... no
Checking for MySQL... no
Checking for OCI (Oracle)... no
Checking for ODBC... yes
Checking for PostgreSQL... no
Checking for SQLite (version 2)... no
Checking for TDS (Sybase)... no
Done running configuration tests.

Configure summary:

Qt Sql:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... yes
  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, Qt is installed.
You should NOT run 'mingw32-make install'.
Note that this build cannot be deployed to other machines or devices.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.


c:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers>

Cheers,
Cedric

[SGaist]

Hi,

Did you check that your MySQL Connector is built for 32bit ?

[cdwijs]

Hi Sgaist,

My further experiments:
I have downloaded the 32 bit C connector:https://downloads.mysql.com/archives/get/file/mysql-connector-c-6.1.11-win32.msi and installed it. Now I have this directory:
C:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib
Due to the location it installed into, I'm confident that it's indeed 32 bits. So here we go again :-) I deleted all the generated files from C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers

C:\Users\cedric>cd c:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers
c:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR="c:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib"

Running configuration tests...
Checking for DB2 (IBM)... no
Checking for InterBase... no
Checking for MySQL... no
Checking for OCI (Oracle)... no
Checking for ODBC... yes
Checking for PostgreSQL... no
Checking for SQLite (version 2)... no
Checking for TDS (Sybase)... no
Done running configuration tests.

My config.log:

Command line: "MYSQL_INCDIR=c:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib"
looking for library db2
Trying source 0 (type inline) of library db2 ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\db2 && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -ldb2cli" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/db2
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\db2 && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> Could Not Find C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\db2\main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> main.cpp:2:20: fatal error: sqlcli.h: No such file or directory
> compilation terminated.
> Makefile:415: recipe for target 'main.o' failed
> mingw32-make: *** [main.o] Error 1
 => source failed verification.
Trying source 1 (type inline) of library db2 ...
  => source failed condition '!config.win32'.
test config.sqldrivers.libraries.db2 FAILED
looking for library ibase
Trying source 0 (type inline) of library ibase ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\ibase && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -lgds32_ms" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/ibase
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\ibase && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> Could Not Find C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\ibase\main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> main.cpp:2:19: fatal error: ibase.h: No such file or directory
> compilation terminated.
> Makefile:415: recipe for target 'main.o' failed
> mingw32-make: *** [main.o] Error 1
 => source failed verification.
Trying source 1 (type inline) of library ibase ...
  => source failed condition '!config.win32'.
test config.sqldrivers.libraries.ibase FAILED
looking for library mysql
Trying source 0 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 1 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 2 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 3 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 4 (type inline) of library mysql ...
  => source failed condition '!config.win32'.
Trying source 5 (type inline) of library mysql ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\mysql && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -llibmysql" "INCLUDEPATH *= \"c:\\Program Files ^(x86^)\\MySQL\\MySQL Connector C 6.1\\lib\"" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/mysql
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\mysql && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> Could Not Find C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\mysql\main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -I"c:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib" -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> main.cpp:5:19: fatal error: mysql.h: No such file or directory
> compilation terminated.
> Makefile:415: recipe for target 'main.o' failed
> mingw32-make: *** [main.o] Error 1
 => source failed verification.
Trying source 6 (type inline) of library mysql ...
  => source failed condition '!config.win32'.
test config.sqldrivers.libraries.mysql FAILED
looking for library oci
Trying source 0 (type inline) of library oci ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\oci && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -loci" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/oci
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\oci && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> Could Not Find C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\oci\main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> main.cpp:2:17: fatal error: oci.h: No such file or directory
> compilation terminated.
> Makefile:415: recipe for target 'main.o' failed
> mingw32-make: *** [main.o] Error 1
 => source failed verification.
Trying source 1 (type inline) of library oci ...
  => source failed condition '!config.win32'.
test config.sqldrivers.libraries.oci FAILED
looking for library odbc
Trying source 0 (type inline) of library odbc ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\odbc && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -lodbc32" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/odbc
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\odbc && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> g++ -Wl,-s -Wl,-subsystem,console -mthreads -o odbc.exe main.o  -LC:\openssl\lib -LC:\Utils\my_sql\mysql-5.6.11-win32\lib -LC:\Utils\postgresql\pgsql\lib -lodbc32 
 => source accepted.
test config.sqldrivers.libraries.odbc succeeded
looking for library psql
Trying source 0 (type pkgConfig) of library psql ...
pkg-config use disabled globally.
  => source produced no result.
Trying source 1 (type psqlConfig) of library psql ...
pg_config not found.
  => source produced no result.
Trying source 2 (type psqlEnv) of library psql ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\psql && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -llibpq -lws2_32 -ladvapi32" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/psql
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\psql && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> Could Not Find C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\psql\main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> main.cpp:2:22: fatal error: libpq-fe.h: No such file or directory
> compilation terminated.
> Makefile:415: recipe for target 'main.o' failed
> mingw32-make: *** [main.o] Error 1
 => source failed verification.
Trying source 3 (type psqlEnv) of library psql ...
  => source failed condition '!config.win32'.
test config.sqldrivers.libraries.psql FAILED
looking for library sqlite2
Trying source 0 (type inline) of library sqlite2 ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\sqlite2 && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -lsqlite" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/sqlite2
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\sqlite2 && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> Could Not Find C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\sqlite2\main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> main.cpp:2:20: fatal error: sqlite.h: No such file or directory
> compilation terminated.
> Makefile:415: recipe for target 'main.o' failed
> mingw32-make: *** [main.o] Error 1
 => source failed verification.
test config.sqldrivers.libraries.sqlite2 FAILED
looking for library tds
Trying source 0 (type sybaseEnv) of library tds ...
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\tds && C:\Qt\5.11.1\mingw53_32\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_LIBDIR += C:\\openssl\\lib C:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib C:\\Utils\\postgresql\\pgsql\\lib" "INCLUDEPATH += C:\\openssl\\include C:\\Utils\\my_sql\\mysql-5.6.11-win32\\include C:\\Utils\\postgresql\\pgsql\\include" "LIBS += -lNTWDBLIB" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/tds
+ cd /d C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\tds && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make
> del main.o
> Could Not Find C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\config.tests\tds\main.o
> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.6.11-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\5.11.1\mingw53_32\mkspecs\win32-g++  -o main.o main.cpp
> main.cpp:2:22: fatal error: sybfront.h: No such file or directory
> compilation terminated.
> Makefile:415: recipe for target 'main.o' failed
> mingw32-make: *** [main.o] Error 1
 => source failed verification.
Trying source 1 (type sybaseEnv) of library tds ...
  => source failed condition '!config.win32'.
test config.sqldrivers.libraries.tds FAILED

my config.cache:

cache.platform = win32-g++
cache.xplatform = win32-g++
cache.db2._KEYS_ = result msgs
cache.db2.result = false
cache.db2.msgs = "Trying source 0 (type inline) of library db2 ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\db2 && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -ldb2cli\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/db2" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\db2 && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> Could Not Find C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\db2\\main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> main.cpp:2:20: fatal error: sqlcli.h: No such file or directory" "> compilation terminated." "> Makefile:415: recipe for target \'main.o\' failed" "> mingw32-make: *** [main.o] Error 1" " => source failed verification." "Trying source 1 (type inline) of library db2 ..." "  => source failed condition \'!config.win32\'."
cache.ibase._KEYS_ = result msgs
cache.ibase.result = false
cache.ibase.msgs = "Trying source 0 (type inline) of library ibase ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\ibase && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -lgds32_ms\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/ibase" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\ibase && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> Could Not Find C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\ibase\\main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> main.cpp:2:19: fatal error: ibase.h: No such file or directory" "> compilation terminated." "> Makefile:415: recipe for target \'main.o\' failed" "> mingw32-make: *** [main.o] Error 1" " => source failed verification." "Trying source 1 (type inline) of library ibase ..." "  => source failed condition \'!config.win32\'."
cache.mysql._KEYS_ = result msgs
cache.mysql.result = false
cache.mysql.msgs = "Trying source 0 (type mysqlConfig) of library mysql ..." "mysql_config not found." "  => source produced no result." "Trying source 1 (type mysqlConfig) of library mysql ..." "mysql_config not found." "  => source produced no result." "Trying source 2 (type mysqlConfig) of library mysql ..." "mysql_config not found." "  => source produced no result." "Trying source 3 (type mysqlConfig) of library mysql ..." "mysql_config not found." "  => source produced no result." "Trying source 4 (type inline) of library mysql ..." "  => source failed condition \'!config.win32\'." "Trying source 5 (type inline) of library mysql ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\mysql && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -llibmysql\" \"INCLUDEPATH *= \\\"c:\\\\Program Files ^(x86^)\\\\MySQL\\\\MySQL Connector C 6.1\\\\lib\\\"\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/mysql" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\mysql && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> Could Not Find C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\mysql\\main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -I\"c:\\Program Files (x86)\\MySQL\\MySQL Connector C 6.1\\lib\" -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> main.cpp:5:19: fatal error: mysql.h: No such file or directory" "> compilation terminated." "> Makefile:415: recipe for target \'main.o\' failed" "> mingw32-make: *** [main.o] Error 1" " => source failed verification." "Trying source 6 (type inline) of library mysql ..." "  => source failed condition \'!config.win32\'."
cache.oci._KEYS_ = result msgs
cache.oci.result = false
cache.oci.msgs = "Trying source 0 (type inline) of library oci ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\oci && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -loci\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/oci" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\oci && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> Could Not Find C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\oci\\main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> main.cpp:2:17: fatal error: oci.h: No such file or directory" "> compilation terminated." "> Makefile:415: recipe for target \'main.o\' failed" "> mingw32-make: *** [main.o] Error 1" " => source failed verification." "Trying source 1 (type inline) of library oci ..." "  => source failed condition \'!config.win32\'."
cache.odbc._KEYS_ = result msgs source sources.0.libs sources.0.includedir sources.0.cflags sources.0.version sources.0.export
cache.odbc.result = true
cache.odbc.msgs = "Trying source 0 (type inline) of library odbc ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\odbc && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -lodbc32\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/odbc" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\odbc && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> g++ -Wl,-s -Wl,-subsystem,console -mthreads -o odbc.exe main.o  -LC:\\openssl\\lib -LC:\\Utils\\my_sql\\mysql-5.6.11-win32\\lib -LC:\\Utils\\postgresql\\pgsql\\lib -lodbc32 " " => source accepted."
cache.odbc.source = 0
cache.odbc.sources.0.libs = -lodbc32
cache.odbc.sources.0.includedir = 
cache.odbc.sources.0.cflags = 
cache.odbc.sources.0.version = 
cache.odbc.sources.0.export = 
cache.psql._KEYS_ = result msgs
cache.psql.result = false
cache.psql.msgs = "Trying source 0 (type pkgConfig) of library psql ..." "pkg-config use disabled globally." "  => source produced no result." "Trying source 1 (type psqlConfig) of library psql ..." "pg_config not found." "  => source produced no result." "Trying source 2 (type psqlEnv) of library psql ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\psql && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -llibpq -lws2_32 -ladvapi32\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/psql" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\psql && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> Could Not Find C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\psql\\main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> main.cpp:2:22: fatal error: libpq-fe.h: No such file or directory" "> compilation terminated." "> Makefile:415: recipe for target \'main.o\' failed" "> mingw32-make: *** [main.o] Error 1" " => source failed verification." "Trying source 3 (type psqlEnv) of library psql ..." "  => source failed condition \'!config.win32\'."
cache.sqlite2._KEYS_ = result msgs
cache.sqlite2.result = false
cache.sqlite2.msgs = "Trying source 0 (type inline) of library sqlite2 ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\sqlite2 && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -lsqlite\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/sqlite2" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\sqlite2 && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> Could Not Find C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\sqlite2\\main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> main.cpp:2:20: fatal error: sqlite.h: No such file or directory" "> compilation terminated." "> Makefile:415: recipe for target \'main.o\' failed" "> mingw32-make: *** [main.o] Error 1" " => source failed verification."
cache.tds._KEYS_ = result msgs
cache.tds.result = false
cache.tds.msgs = "Trying source 0 (type sybaseEnv) of library tds ..." "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\tds && C:\\Qt\\5.11.1\\mingw53_32\\bin\\qmake.exe \"CONFIG -= qt debug_and_release app_bundle lib_bundle\" \"CONFIG += shared warn_off console single_arch\" \"QMAKE_LIBDIR += C:\\\\openssl\\\\lib C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\lib C:\\\\Utils\\\\postgresql\\\\pgsql\\\\lib\" \"INCLUDEPATH += C:\\\\openssl\\\\include C:\\\\Utils\\\\my_sql\\\\mysql-5.6.11-win32\\\\include C:\\\\Utils\\\\postgresql\\\\pgsql\\\\include\" \"LIBS += -lNTWDBLIB\" C:/Qt/5.11.1/Src/qtbase/src/plugins/sqldrivers/config.tests/tds" "+ cd /d C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\tds && set MAKEFLAGS=& mingw32-make clean && set MAKEFLAGS=& mingw32-make" "> del main.o" "> Could Not Find C:\\Qt\\5.11.1\\Src\\qtbase\\src\\plugins\\sqldrivers\\config.tests\\tds\\main.o" "> g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++11 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -I. -IC:\\openssl\\include -IC:\\Utils\\my_sql\\mysql-5.6.11-win32\\include -IC:\\Utils\\postgresql\\pgsql\\include -IC:\\Qt\\5.11.1\\mingw53_32\\mkspecs\\win32-g++  -o main.o main.cpp" "> main.cpp:2:22: fatal error: sybfront.h: No such file or directory" "> compilation terminated." "> Makefile:415: recipe for target \'main.o\' failed" "> mingw32-make: *** [main.o] Error 1" " => source failed verification." "Trying source 1 (type sybaseEnv) of library tds ..." "  => source failed condition \'!config.win32\'."

qtsqldrivers-config.pri

QT.sqldrivers.enabled_features = 
QT.sqldrivers.disabled_features = 
QT.sqldrivers.QT_CONFIG = 
QT.sqldrivers.exports = 
QT.sqldrivers_private.enabled_features = sql-odbc sql-sqlite
QT.sqldrivers_private.disabled_features = sql-db2 sql-ibase sql-mysql sql-oci sql-psql sql-sqlite2 sql-tds system-sqlite
QT.sqldrivers_private.libraries = odbc
QMAKE_LIBS_ODBC = -lodbc32

Cheers,
Cedric

[SGaist]

Where exactly do you have mysql.h located on your computer ?

[cdwijs]

Hi, i have mysql.h at the following locations:

C:\Program Files\MySQL\MySQL Server 8.0\include
C:\Program Files (x86)\MySQL\MySQL Connector C 6.1\include
C:\Program Files\MySQL\MySQL Connector C 6.1\include

Cheers,
Cedric

[SGaist]

Then why are you using MYSQL_INCDIR="c:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib" ?
It should be includeand not lib.

[cdwijs]

Thank you.
I used /lib because it's in on the instructions on the Qt website: http://doc.qt.io/qt-5/sql-driver.html Can I file a bug report for the instructions on the site?

How to Build the QMYSQL Plugin on Windows

You need to get the MySQL installation files. Run SETUP.EXE and choose "Custom Install". Install the "Libs & Include Files" Module. Build the plugin as follows (here it is assumed that MySQL is installed in C:\MySQL):
cd %QTDIR%\qtbase\src\plugins\sqldrivers
qmake -- MYSQL_INCDIR=C:/MySQL/include "MYSQL_LIBDIR=C:/MYSQL/MySQL Server <version>/lib/opt"
nmake sub-mysql
If you are not using a Microsoft compiler, replace nmake with mingw32-make in the line above.

I'll test your suggestion shortly.
Cheers,
Cedric

[SGaist]

I think you may have misread the documentation.

There are two variables: MYSQL_INCDIR and MYSQL_LIBDIR.

[cdwijs]

I see it now, I indeed only typed halve of the command.
Thanks, I can now test it further.

Cheers,
Cedric

[Cobra91151]

Hello! Do you have libs included in your .pro file?

contains(QMAKE_TARGET.arch, x86_64) {
    LIBS += -L"C:/MySQL/mysql-5.7.22-winx64/lib" -llibmysql
} else {
    LIBS += -L"C:/MySQL/mysql-5.7.22-win32/lib" -llibmysql
}

Note that you need to download the MySQL from here MySQL Community Server and extract the data for example to C drive. Also I suggest to copy libmysql.dll to the application directory.

I use Qt 5.9.6 and Visual Studio 2017 compiler and it doesn't require to build the driver for MySQL.

[cdwijs]

Hi All,

I'm one step closer to my goal, I can now build the plugin. I cannot yet connect to my database.
Steps I've taken:

1. Download and install https://downloads.mysql.com/archives/get/file/mysql-connector-c-6.1.11-win32.msi
2. Add C:\Qt\Tools\mingw530_32\bin and C:\Qt\5.10.1\mingw53_32\bin to the path
3. Open cmd.exe, and enter the following commands:

c:\Qt\5.10.1\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR="c:\Program Files (x86)\MySQL\MySQL Connector C 6.1\include" MYSQL_LIBDIR="c:\Program Files (x86)\MySQL\MySQL Connector C 6.1"\lib

Running configuration tests...
Checking for DB2 (IBM)... no
Checking for InterBase... no
Checking for MySQL... yes
Checking for OCI (Oracle)... no
Checking for ODBC... yes
Checking for PostgreSQL... no
Checking for SQLite (version 2)... no
Checking for TDS (Sybase)... no
Done running configuration tests.

Configure summary:

Qt Sql:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. yes
  OCI (Oracle) ........................... no
  ODBC ................................... yes
  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, Qt is installed.
You should NOT run 'mingw32-make install'.
Note that this build cannot be deployed to other machines or devices.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

mingw32-make

<<lots of text>>

4. Create a new Qt program, with the following options:
   Qt widgets application
   Name: sqlTest
   Kit: Desktop Qt 5.11.1 MinGB 32 bit (default)
   ClassName: (MainWindow) (default)
   Version control: Git

mysql.pro

QT       += core gui sql
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = sqlTest
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
SOURCES += \
        main.cpp \
        mainwindow.cpp
HEADERS += \
        mainwindow.h
FORMS += \
        mainwindow.ui

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtSql>
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
   db.setHostName("localhost");
   db.setDatabaseName("world");
   db.setUserName("root");
   db.setPassword("PassOlyForForumQuestion");
   bool ok = db.open();
   qDebug()<<ok;
}

MainWindow::~MainWindow()
{
    delete ui;
}

Program output:

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
false

Cheers,
Cedric

[SGaist]

Did you install the plugin ?

Did you also check that the PATH environment variable in the Run part of the Project panel contains the folder where the MySQL .dlls can be found ?

[cdwijs]

How can I install the plugin? Where can the plugin be found? What does it look like? Where does Qt look for the plugin?

Why does the Qt runtime tell me the QMYSQL driver is available while the driver cannot be loaded? Is there any way to see why the driver did not load?

Is there a guide anywhere that works with the current version of myqsl and the current version of Qt? This guide is for mysql version 5.1: https://forum.qt.io/topic/40672/how-to-create-the-plugin-of-mysql-for-qt

Am I the first one that tries to use Qt 5 and mysql server 8?

Cheers,
Cedric

[SGaist]

It's explained in the documentation
In the plugins subfolder of your Qt installation under sqldrivers.
It's a .dll file since you're on Windows.
Qt looks for the plugins in the subfolder named plugins unless you tweaked the qt.conf file.

Likely because it can find the plugin but will fail to load it. Most of the time it happens because the MySQL .dll files can't be found at run time hence my suggestion in my last post.

The current Qt documentation does.

No you're note, however MySQL server 8 saw a change in their support for their my_bool custom type. There's a patch to support build the Qt MySQL plugin with MySQL 8.

[cdwijs]

Thanks for your reply.

The documentation you linked (http://doc.qt.io/qt-5/sql-driver.html#building-the-drivers) assumes mysql is installed in c:\mysql. This is not the case for a default installation of mysql8, as it installs itself into c:\program files and c:\program files (x86). This leads me to the conclusion that the install instructions on that page are outdated.

Do you know any instructions for building the plugin for qt5 and mysql 8?

Cheers,
Cedric

[SGaist]

The doc says:

You need to get the MySQL installation files. Run SETUP.EXE and choose "Custom Install". Install the "Libs & Include Files" Module. Build the plugin as follows (here it is assumed that MySQL is installed in C:\MySQL):

This simply means that it assumes that the user selected that folder to install MySQL.

Then:

cd %QTDIR%\qtbase\src\plugins\sqldrivers
qmake -- MYSQL_INCDIR=C:/MySQL/include "MYSQL_LIBDIR=C:/MYSQL/MySQL Server <version>/lib/opt"
nmake sub-mysql

It shows that the build is configured to use that folder.

If you put MySQL somewhere else, update the command accordingly to use that folder.

[cdwijs]

I have done the steps again:
c:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR="c:\Program Files (x86)\MySQL\MySQL Connector C 6.1\include" MYSQL_LIBDIR="c:\Program Files (x86)\MySQL\MySQL Connector C 6.1"\lib
and
mingw32-make

After this, there's no mysql.dll below C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers (in fact, there's no mysql.dll on my entire C:\ drive)

However, this directory is newly created:
C:\Qt\5.11.1\Src\qtbase\src\plugins\sqldrivers\plugins\sqldrivers
it contains the following files: (and a few extra files with sqlite in the name)
qsqlmysql.dll
qsqlmysqld.dll
qsqlodbc.dll
qsqlodbcd.dll

Where do I put these?

Cheers,
Cedric

[jsulm]

@cdwijs You forgot

mingw32-make install

as shown in the documentation...

[cdwijs]

Thanks jsulm,

I've just done the mingw32-make install, but my Qt program does not load the driver yet.
I've installed Process monitor (https://docs.microsoft.com/en-us/sysinternals/downloads/procmon) to monitor the syscalls from my application. I've done the following steps with it:
1-run procmon.exe
2-choose filter-reset filter
3-run my program
4-choose tools-process tree
5-select my program, right click, and choose "Add process to include filter" Now only the syscalls from my program are shown.
6)ctrl-f mysql and press F3 a couple of times. Now I see BUFFER OVERFLOW. Can this be a problem?

CreateFile C:\Qt\5.10.1\mingw53_32\plugins\sqldrivers\qsqlmysql.dll SUCCESS Desired Access: Generic Read, Disposition: Open, Options: Synchronous IO Non-Alert, Non-Directory File, Attributes: N, ShareMode: Read, Write, AllocationSize: n/a, OpenResult: Opened
QueryInformationVolume C:\Qt\5.10.1\mingw53_32\plugins\sqldrivers\qsqlmysql.dll BUFFER OVERFLOW VolumeCreationTime: 31-01-2018 09:56:48, VolumeSerialNumber: AC0C-32AB, SupportsObjects: True, VolumeLabel: WinÀ

Also, I see my program searches for libmysql.dll in the following paths:

C:\ProgramData\Oracle\Java\javapath_target_378770\LIBMYSQL.DLL
C:\Windows\SysWOW64\libmysql.dll
C:\Windows\libmysql.dll
C:\Windows\SysWOW64\wbem\libmysql.dll
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\libmysql.dll
C:\Program Files\Git\cmd\libmysql.dll
C:\Program Files\TortoiseGit\bin\libmysql.dll
C:\Qt\Tools\mingw530_32\bin\libmysql.dll
C:\Program Files\PuTTY\libmysql.dll
C:\Program Files\MySQL\MySQL Utilities 1.6\libmysql.dll
C:\Qt\5.10.1\mingw53_32\bin\libmysql.dll

Mysql.dll is present on my system: C:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib, so I copy it into
C:\Qt\Tools\mingw530_32\bin
Now I see libmysql.dll being successfully loaded by my program, and the error message is gone, and after supplying the correct password, I now have a connection into my mysql database.

Thank you all for your assistance.

Shall I edit my opening post with the solution, place it below, or make a new post about it?

Cheers,
Cedric

[jsulm]

@cdwijs The solution is already at the end of this thread, just mark it as solved.