[Solved][PyQt] Install OCI driver
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I'm trying to open the database with Qt Creator in C++ at the moment, at least to see if it's reachable, but I have a strange error, the QOCI driver is available but not loaded, i.e. when i list the drivers available with QSqlDatabase::drivers() i have the "QOCI" and "QOCI8" drivers, but when i call QSqlDatabase::addDatabase("QOCI"), i got the error message "Driver not loaded".
Do you know where it could come from ?
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Check the PATH environment variable in the Run part of the Project panel. Verify that it does contain the path to the folder containing the OCI dlls
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The PATH variable is ok, i also set the QT_DEBUG_PLUGINS variable to 1 in order to have a little more information, and i can see that the driver are found :
"QtFactoryLoader::QFactoryLoader() looking at "C:/Qt/4.8.5/plugins/sqldrivers/qsqlocid4.dll". keys ("QOCI8","QOCI")"
But apparently they're not loaded because i still have the "Driver not loaded" error when i try to create a database (even using QSQLITE or QODBC).
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Am I reading correctly, you are not even able to create a database with QSQLITE ?
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My bad, wasn't declaring my QSqlDatabase correctly...
I used :
@QSqlDatabase db = new QSqlDatabase();
db->addDatabase("QOCI")@Instead of
@QSqlDatabase db = QSqlDatabase::addDatabase("QOCI")@Now i'm back to my initial problem, which was using the OCI driver with pyqt4.
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I have the following error when i copy the qsqloci4.dll to the Pyqt4/plugins/sqldrivers folder with the variable QT_DEBUG_PLUGINS set to 1 :
@QFactoryLoader::QFactoryLoader() looking at "C:/Python27/Lib/site-packages/PyQt4/plugins/sqldrivers/qsqloci4.dll"
The file 'C:/Python27/Lib/site-packages/PyQt4/plugins/sqldrivers/qsqloci4.dll' is not a valid Qt plugin.
not a plugin@PyQt4 actually finds the dll but doesn't see it as a plugin... Maybe there is a specific way to build the oci driver for PyQt4 ?
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Where are the the OCI dll(s) located ?
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The original oci.dll from Oracle is located in C:/oracle/client/bin and the dll's I built for Qt4 qsqloci4, qsqlocid4.dll are in C:/Qt/4.8.5/plugins/sqldrivers.
If I add the library path of the Qt4 plugins I have the same error :
@app =QtGui.Qapplication(sys.argv)
QtGui.QApplication.addLibraryPath("C:/Qt/4.8.5/plugins/sqldrivers")@Output :
@QFactoryLoader::QFactoryLoader() looking at "C:/Qt/4.8.5/plugins/sqldrivers/qsqloci4.dll"
The file 'C:/Qt/4.8.5/plugins/sqldrivers/qsqloci4.dll' is not a valid Qt plugin.
not a plugin@ -
So is C:/oracle/client/bin in your PATH environment variable ? A plugin that can't load like that generally means it can't found its dependencies
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I ran Dependency Walker on the qsqloci4.dll file located in C:/Python27/Lib/site-packages/PyQt4/plugins/sqldrivers and I have the following output :
@MSVCR90.DLL Error opening file. The system cannot find the file specified (2)
IESHIMS.DLL Error opening file. The system cannot find the file specified (2)@ (I have the 2 same errors with qsqlite4.dll so i don't think these 2 are an issue)And 5 messages :
@Error: At least one required implicit or forwarded dependency was not found.
Error: At least one module has an unresolved import due to a missing export function in an implicitly dependent module.
Error: modules with different CPU types were found.
Warning: At least one delay-load dependency module was not found.
Warning: At least one module has an unresolved import due to a missing export function in a delay-load dependent module.@It's my first time using Dependency Walker and i don't really know how to solve these (if it's the problem)
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There's something fishy here, are you sure you are using the same compiler as the one that was used to build PyQt4's Qt ?
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I used the PyQt4 binary which can be found at http://www.riverbankcomputing.co.uk/software/pyqt/download, i assumed it used the same compiler but how can I be sure of it ?
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I think the problem is, indeed, coming from the way PyQt4 is built with the binary, i rebuilt everything and got a new error message :
@The plugin 'C:/Python_x86/Lib/site-packages/PyQt4/plugins/sqldrivers/qsqloci4.dll' :
Plugin uses incompatible Qt library
expected build key "Windows msvc release full-config", got "Windows mingw release full-config"
not a plugin@Now i'm trying to build PyQt' from the .zip archive using mingw but got the error
@Error: release\qtdetail.exe failed to create qtdetail.out. Make sure your Qt installation is correct.@And a messagebox appears :
@The procedure's entry point _ZN11QTextStreamC1EP9QIODevice cannot be found in the dynamic link library QtCore4.dll@ (approximate translation from French, i don't know the exact error message in english)EDIT : Solved the last error copying the QtCore4.dll in the Pyqt folder, i let you know what happens when i'm done building pyqt (it seems to take a while)
EDIT2 : I followed the tutorial on this site : http://www.oak-tree.us/blog/index.php/2009/05/12/pyqt-windows but now I got import errors, it seems python can't find the PyQt4 folder (which is in the Qt folder, as suggested in the tutorial) :
@from PyQt4 import QtCore, QtGui, QtSql
importError: No module named PyQt4@Besides, the PyQt built doesn't look like the previous one I installed through the binary file, there's no plugins folder and it seems to lack dll (such as QtGui4.dll which can't be found in the PyQt4 directory)
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I finally managed to install the driver ! The problem came from the compiler as you suggested, the PyQt4 installer uses the Visual Studio compiler whereas Qt 4.8.5 uses mingw32 4.4...
I rebuilt everything using mingw32 4.4 and it finally worked.
To build the pyqt4 from the zip archive I used "this tutorial":http://www.oak-tree.us/blog/index.php/2009/05/12/pyqt-windows but i built it in C:\Python27\Lib\site-packages\PyQt4 instead of the Qt folder.
I also had to remove 2 lines from the Makefile located at C:\Python27\Lib\site-packages\PyQt4
@copy /y C:\Python27\Lib\site-packages\PyQt4_init_.py C:\Python27\Lib\site-packages\PyQt4_init_.py
copy /y pyqtconfig.py C:\Python27\Lib\site-packages\PyQt4\pyqtconfig.py@Because I had this error :
@File cannot be copied onto itself@Anyway, thanks a lot for your help SGaist
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You're welcome !
Happy Coding ! :)
