Building database driver, IT difficulties

Christian Ehrlicher

First you should tell us if you want to compile the whole Qt or only a single plugin

But nonetheless it's nmake and not make when you use VisualStudio.

SPlatten

@Christian-Ehrlicher , I thought I'd made it clear I am trying to build the SQL plugin driver for Qt. I am following the link:
https://doc.qt.io/qt-5/sql-driver.html#driverwithqt

What is vague about this? As previously stated the documentation calls:

cd $QTDIR/qtbase/src/plugins/sqldrivers/mysql
make install

Christian Ehrlicher

So did you call qmake, were the mysql libs and include paths found and did you actually compile the driver like explained?

Also why do you want to build the plugin for 5.9 on your own? It was still shipped there afair.

J.Hilk

~~@SPlatten I would actually suggest using jom instead of nmake, as nmake is single threaded~~

Stay with nmake for now ;-)

SPlatten

@J-Hilk , its like mission impossible, the laptop is so locked down its very difficult. I've cleaned out the cache:

rm -R config.*

Then run nmake. result is:

Microsoft (R) Program Maintenance Utility Version 14.00.24245.0
Copyright (C) Microsoft Corporation.  All rights reserved.
 
        cd sqlite\ && ( if not exist Makefile c:\Qt\Qt5.9.2\5.9.2\msvc2015\bin\qmake.exe -o Makefile C:\Qt\Qt5.9.2\5.9.2\Src\qtbase\src\plugins\sqldrivers\sqlite\sqlite.pro ) && "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\nmake.exe" -f Makefile
 
Microsoft (R) Program Maintenance Utility Version 14.00.24245.0
Copyright (C) Microsoft Corporation.  All rights reserved.
 
        "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\nmake.exe" -f Makefile.Release all
 
Microsoft (R) Program Maintenance Utility Version 14.00.24245.0
Copyright (C) Microsoft Corporation.  All rights reserved.
 
        rc /NOLOGO -DUNICODE -D_UNICODE -DWIN32 -DNDEBUG -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_OMIT_COMPLETE -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_RTREE -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 -D_WINDLL -fo .obj\release\qsqlite_resource.res qsqlite_resource.rc
qsqlite_resource.rc(1) : fatal error RC1015: cannot open include file 'windows.h'.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\rc.EXE"' : return code '0x1'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.

Christian Ehrlicher

You're dev environment is not properly set up. You did not open it via 'Visual Studio command prompt' so the variables for your compiler are not there. Nothing Qt-related.

SPlatten

@Christian-Ehrlicher , where would I find that option? I've right clicked in the File Explorer and the only options appearing in the context menu are:

Open with Visual Studio
Git GUI Here
Git Bash Here

Maybe something else the installer couldn't complete due to IT restrictions?

KroMignon

@SPlatten said in Building database driver, IT difficulties:

its like mission impossible, the laptop is so locked down its very difficult. I've cleaned out the cache:

It is not easy but follow this https://forum.qt.io/post/656068 and it should work

SPlatten

@KroMignon , excellent, thank you.

KroMignon

@SPlatten said in Building database driver, IT difficulties:

excellent, thank you.

your welcome

SPlatten

@KroMignon , now it all appears to have built without any issues, I'm using source that I wrote on my iMAC when doing the same thing, have put in the database details using driver name QMYSQL, but when I try to connect I get the output:

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

JonB

@SPlatten
Whenever you get QMYSQL driver not loaded, start by setting environment variable QT_DEBUG_PLUGINS=1, run application, look at diagnostic output, especially at end.

SPlatten

@JonB said in Building database driver, IT difficulties:

QT_DEBUG_PLUGINS

Thats easier said than done, on this system I cannot set environment variables....

KroMignon

@SPlatten said in Building database driver, IT difficulties:

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

I guess the mysql-connector dynamic library (libmysql.dll) is not in your path

JonB

@SPlatten said in Building database driver, IT difficulties:

Thats easier said than done, on this system I cannot set environment variables....

That is an unusual statement, I have not heard of such a system. You will have problems if you cannot set environment variables....

You should be able to do so. Even if you have to write a one-line "wrapper" program....

KroMignon

@SPlatten said in Building database driver, IT difficulties:

Thats easier said than done, on this system I cannot set environment variables....

You can do it with Qt-Creator: Projects / Build & Run, Select "Run", than in "Run Settings"/Environment you can add as many environment variable as you want => cf. https://doc.qt.io/qtcreator/creator-project-settings-environment.html

SPlatten

@JonB , tell me about it, please read the first post on this thread for more information.

JonB

@SPlatten
If you mean

I cannot modify system environment variables

there is no need to set a system variable, only an environment variable for the duration of running your program. Either in a Command Prompt, or as @KroMignon wrote in Qt Creator if you are running from there. Or in a .bat script, or in a one-line "wrapper" C/C++ program. heck, you're running nmake, that I believe sets environment variables, you could even do so from there....

And, depending on when Qt produces that runtime error, if it's on the statement which creates a QSqlDatabase, as I think it might be, then you can just set the environment variable in the Qt program you are writing beforehand.

SPlatten

@JonB , setting an environment variable doesn't help when Qt Creator is running at the system level. Any environment variable added to the console, is only visible to the environment of the console.

JonB

@SPlatten
I have tried to show you a number of places you can set the environment variable. If you really say you cannot from Qt Creator (I don't understand why not and I don't understand what you are saying), try any of the others....