Getting crazy with "driver not loaded" mysql driver in windows 7 (mingw 32bit)
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Hello! Thank you for so fast reply.
I looked a lot in the forum, I swear! Three days, maybe I'm no so much able to understand the procedures.
So, I have already update the path (like I wrote in the first item point of my post):Maybe I don't understand whatever I have to add, the test selectioned is the path of libmysql.lib, or not?
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The question might be silly but are you sure that the DLLs (not the .lib files) are there ?
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The question might be silly but are you sure that the DLLs (not the .lib files) are there ?
I hope that the only need dll is "libmysql.dll", if yes... so:
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Yes should be.
So next step: add QT_DEBUG_PLUGINS 1 to the environment variable, you should see more information about what is happening at load time.
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Yes should be.
So next step: add QT_DEBUG_PLUGINS 1 to the environment variable, you should see more information about what is happening at load time.
QFactoryLoader::QFactoryLoader() checking directory path "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qminimal.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qminimal.dll, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"minimal"
]
},
"className": "QMinimalIntegrationPlugin",
"debug": false,
"version": 328960
}"The plugin 'D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qminimal.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qminimald.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qminimald.dll, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"minimal"
]
},
"className": "QMinimalIntegrationPlugin",
"debug": true,
"version": 328960
}Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qoffscreen.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qoffscreen.dll, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"offscreen"
]
},
"className": "QOffscreenIntegrationPlugin",
"debug": false,
"version": 328960
}"The plugin 'D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qoffscreen.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qoffscreend.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qoffscreend.dll, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"offscreen"
]
},
"className": "QOffscreenIntegrationPlugin",
"debug": true,
"version": 328960
}Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qwindows.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qwindows.dll, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"windows"
]
},
"className": "QWindowsIntegrationPlugin",
"debug": false,
"version": 328960
}"The plugin 'D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qwindows.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qwindowsd.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qwindowsd.dll, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"windows"
]
},
"className": "QWindowsIntegrationPlugin",
"debug": true,
"version": 328960
}Got keys from plugin meta data ("windows")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/Andrea/Documents/build-provadb-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug/platforms" ...
loaded library "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforms/qwindowsd.dll"
QFactoryLoader::QFactoryLoader() checking directory path "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/Andrea/Documents/build-provadb-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/Andrea/Documents/build-provadb-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug/platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/Andrea/Documents/build-provadb-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/iconengines" ...
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/iconengines/qsvgicon.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/iconengines/qsvgicon.dll, metadata=
{
"IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
"MetaData": {
"Keys": [
"svg",
"svgz",
"svg.gz"
]
},
"className": "QSvgIconPlugin",
"debug": false,
"version": 328960
}"The plugin 'D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/iconengines/qsvgicon.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/iconengines/qsvgicond.dll"
Found metadata in lib D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/iconengines/qsvgicond.dll, metadata=
{
"IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
"MetaData": {
"Keys": [
"svg",
"svgz",
"svg.gz"
]
},
"className": "QSvgIconPlugin",
"debug": true,
"version": 328960
}Got keys from plugin meta data ("svg", "svgz", "svg.gz")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/Andrea/Documents/build-provadb-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug/iconengines" ...
"C:/Users/Andrea/Documents/build-provadb-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug"
QFactoryLoader::QFactoryLoader() checking directory path "D:/Qt/Qt5.5.0/5.5/mingw492_32/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/Andrea/Documents/build-provadb-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug/accessiblebridge" ... -
Ok, I missed you wrote MinGW in your title. IIRC MySQL is built with Visual Studio. So you need to build the libraries with MinGW.
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Hello everybody!
Sorry for my English, I don't speak or write often it.
This is the third day that I'm struggling whit this plugin, before this post I have looked everywhere in this forum (and others), without find the solution.The code:
db = new QSqlDatabase(); qDebug() << "drivers:" db->drivers(); db->setHostName("localhost"); qDebug() << db->addDatabase("QMYSQL3"); qDebug() << "Valid? "<< db->isValid(); // Returns true if connection exists qDebug() << db->lastError();And the output:
drivers: ("QMYSQL", "QMYSQL3")
QSqlDatabase(driver="QMYSQL3", database="", host="", port=-1, user="", open=false)
Valid? false
QSqlError("", "Driver not loaded", "Driver not loaded")I use it on Ubuntu with succes, but now, in windows it seems there's no way to make it work.
I tried the prebuilt plugin, and also the compiled one from source code after watching a lot of tutorial, guide ecc.I already:
- Added to the environment path (both in qt and in windows) of minwg "bin", mysql "lib" qt "bin" folder.
- Copied libmysql.dll and mysqlclient.lib (from mysql directory) to each directory possible
- Included mysql library directories to the project with:
QMAKE_LIBDIR += "C:\Program Files (x86)\MySQL\MySQL Server 5.5\lib"
LIBS += libmysql - tried with visual studio compiler version
- installed and tried 4 different version of mysql (and XAMPP)
- generated: libmysql.def and libmysql.a with reimp and dlltool command
- the pointer to QSqlDatabase is allocated after QApplication has initialized
As you can see, the qsqlmysql.dll driver is recognized but the driver isn't loaded, why?
What should I have been wrong?Unfortunately it appear difficult to find the source code that can be compiled with the latest version of cmake and mingw, I tried and had several building error.
I found this link: Compiling mysql connector C++ with mingw, compiling errors in wich there are the same errors.
I misunderstood or it seems that anyone that want to use the qt plugin for mysql (with mingw) have to use a 4 or 5 years old source code? Maybe I should switch to visual studio compiler?
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That I can't comment on. You should ask the MySQL people about that matter.
