Driver not loaded

[rogerio]

Hello, i am new with qt/c++. I am trying to use postgresql driver( postgresql 8.2), but i got a error: Driver not loaded.
I am using qt4.4.1(open source edition) on windows xp. I am using eclipse via Qt eclipse Integration v1.4.1.
Everything is fine with postgres. I connected via java.
My .pro is like
...
INCLUDEPATH = "D:\Arquiv~1\PostgreSQL\8.2\include"
QT += core \
gui \
sql \
xml \
...
LIBS += "D:\Arquiv~1\PostgreSQL\8.2\lib\ms\libpq.lib"
....

I put the, dlls, qsqlpsql4.dll and qsqlpsqld4.dll on folder qtdir/ bin

when i execute the snippet: qDebug() << QSqlDatabase::drivers(); got ("QSQLITE", "QODBC3", "QODBC")

Somebody could help-me
regards,
Rogério

[jpn]

See How to build the QPSQL plugin.

[rogerio]

cd %QTDIR%\src\plugins\sqldrivers\psql
qmake -o Makefile "INCLUDEPATH+=D:\Arquiv~1\PostgreSQL\8.2\inclu de" "LIBS+=D:\Arquiv~1\PostgreSQL\8.2\lib\ms\libpq.lib " psql.pro
make.

yes, i did this before and got:
qsqlpsqld4.dll; qsqlpsql4.dll; libqsqlpsqld4.a; libqsqlpsql4.a.
The dlls were generated in folder qtdir\plugins\sqldrivers.

The diference is that i used "make" not "nmake". I am using MinGW

is missing something else to load driver psql?

thanks,
Rogério

[jpn]

You might need to add the PSQL DLL to PATH. You can open qsqlpsql4.dll to Dependency Walker to verify that loading the plugin is possible.

[rogerio]

I tried something else. I compiled with nmake.
qmake -o Makefile "INCLUDEPATH+=D:\Arquiv~1\PostgreSQL\8.2\inclu de" "LIBS+=D:\Arquiv~1\PostgreSQL\8.2\lib\ms\libpq .lib " psql.pro
nmake.

But, i have to compile my program with nmake Too.this way, I could load postgresql driver. If use make to compile, the program not work(Driver not load).

I would like use (mingw)make. Is it possible use mingw(make)?


regards,
Rogério

[jpn]

If your psql library is built with MSVC, you cannot use it with a different compiler.

[wadadliblue]

I have a similar problem:
I'm using Qt 4.5.0 with PostgreSQL 8.3 on Windows vista. The included documentation says to use this:

cd %QTDIR%\src\plugins\sqldrivers\psql
qmake -o Makefile "INCLUDEPATH+=C:\psql\include" "LIBS+=C:\psql\lib\ms\libpq.lib" psql.pro
nmake

Since installation of postgres doesn't have the ms dir i changed it to look like this:

cd %QTDIR%\src\plugins\sqldrivers\psql
qmake -o Makefile "INCLUDEPATH+=C:\psql\include" "LIBS+=C:\psql\lib\libpq.lib" psql.pro
nmake

First of all it tells me nmake is not a valid command so i use make. This completes without any recognizable errors but when i check QSqlDatabase::drivers() it tells me
QSQLITE
QODBC3
QODBC Which are the drivers that Qt came with anyway

What do I have to do to get this thing to compile?

[wadadliblue]

I solved the problem - well, kind of. Found the answer here http://qtwiki.org/QPSQL_driver_not_l...usual_solution

[MarkoSan]

I have similar problem with MYSQL driver. From my app I get "Driver not loaded.". From QQSqlDatabase for availabe drivers I get: "QSQLITE QMYSQL3 QMYSQL QODBC3 QODBC". I've built plugin according to QtCentre's Wiki. I've copied qmysql.dll into qt's bin dir, which IS IN PATH. I have also added "+=SQL" into .pro file. What else can be wrong or what am I missing, please help!