View Full Version : QT4 and Postgresql driver
alphaqt
26th February 2006, 18:17
Hi guys,
i'have tried to compile QT with option -qt-sql-psql or -plugin-sql-psql but each time it fails!
I am using QT 4.1.0 on a win XP box, Postgresql 8.0.6, and MinGW as a compiler.
first i run :
configure -I C:\psql\8.0\include -qt-sql-psql
and it works fine! (at least without any error)
and then i run :
mingw32-make (to start compiling QT)
after several minutes it shows this error :
C:\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\ mingw32\bin\ld.exe: cannot find -lpq
collect2: ld returned 1 exit status
mingw32-make[3]: *** [..\..\lib\QtSqld4.dll] Error 1
can anyone help me?
jacek
26th February 2006, 18:21
Try: configure -I C:\psql\8.0\include -L C:\psql\8.0\lib -qt-sql-psql
alphaqt
27th February 2006, 13:58
thanks a lot, it worked fine (compiling and acces to database either localhost and remotehost).
I have one (or two) more questions:
Q1 : My application must be installed in another box (win XP), how can put the plugin with, in order to access to the database from that box?
Q2 : I have tried to compile Qt with -plugin-sql-psql option, it worked fine and it generated 2 DLLs qsqlpsql.dll and qsqlpsqld.dll, i put them in my application rootdir, but no success, the message displayed in QSqlError.text() is "Driver not loaded Driver not loaded" :confused:
How can i use the plugin to access to Postgresql?
thanks a lot
----------------
sorry if my questions aren't interesting
zlatko
27th February 2006, 15:03
Look here
same problem (http://www.qtcentre.org/forum/showthread.php?t=730&highlight=loaded)
alphaqt
27th February 2006, 16:21
thank u zlatko, i have already read this thread.
let me explain what problem i currently have :
first i ran :
configure -I c:\psql\8.0\include -L c:\psql\8.0\lib -qt-sql-psql (thanks to Jacek)
then minwg32-make
this worked fine and i can connect to database without any problem
second in another box(same configuration) i ran :
configure -I c:\psql\8.0\include -L c:\psql\8.0\lib -plugin-sql-psql
then minwg32-make.
no error after compiling, but when i launch the application QSqlError.text() has : "Driver not loaded Driver not loaded"
in the thread u quoted, raphael could make his application run with the plugin.
i hope this explaination is clear to you.
zlatko
27th February 2006, 16:32
If you create folder sqldrivers and put it driver dll he must be loaded, else i dont know how i can help you....becose this thread repeated in forum more times
jacek
27th February 2006, 16:50
no error after compiling, but when i launch the application QSqlError.text() has : "Driver not loaded Driver not loaded"
Where did that plugin land? In %QTDIR%/plugins/sqldrivers? Where are PostgreSQL DLLs*? Did you try to copy them to the same directory where the executable is?
* AFAIR you need at least libpq.dll, iconv.dll, ssleay.dll and crypto.dll (names could be slightly different, as I don't remeber them well). Use try the Dependency Walker (http://www.dependencywalker.com) it will show you if your program can't find some libraries.
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