MySQL Driver not loaded on PC without Qt

[wysota]

If you are using the "Qt Sdk" (libraries+Creator) release of Qt be sure you copy files from the right directory.

[daemonna]

i got a same problem... on my machine i can find following

locate qt|grep -i mysql
/usr/include/qt4/Qt/qsql_mysql.h
/usr/include/qt4/QtSql/QMYSQLDriver
/usr/include/qt4/QtSql/QMYSQLResult
/usr/include/qt4/QtSql/qsql_mysql.h
/usr/lib/qt4/plugins/sqldrivers/libqsqlmysql.so
/usr/share/doc/libqt4-sql-mysql
/usr/share/doc/libqt4-sql-mysql/LGPL_EXCEPTION.txt
/usr/share/doc/libqt4-sql-mysql/changelog.Debian.gz
/usr/share/doc/libqt4-sql-mysql/changelog.gz
/usr/share/doc/libqt4-sql-mysql/copyright
/var/lib/dpkg/info/libqt4-sql-mysql.list
/var/lib/dpkg/info/libqt4-sql-mysql.md5sums

is the /usr/lib/qt4/plugins/sqldrivers/libqsqlmysql.so right library???

[Lykurg]

Huh, are we now talking about Linux? Wasn't it windows in the first

EDIT: Ah, different guy! You are targeting which distro? The most have qt installed, so you normally don't need to deliver the Qt libraries along your application.

EDIT 2: Yeah, noticed that. Took a while...

[wysota]

It's another guy.

[KTvsPeacock]

i'm using the qt sdk and i took the dll from the qt/bin-folder (except the qsqlmysql4.dll of course).

doesn't QApplication only looks in the given library paths for plugins?
normally it searches in qt/plugins/ and the app-folder. i removed both using setLibraryPath(""), but still the qsqlmysql4.dll in qt/plugins was found and used. this is confusing

[wysota]

The plugin has to reside in a sqldrivers subdirectory of the directory containing the binary of your application.

[KTvsPeacock]

you mean like this:

"2nd try:

/App/app.exe
.
.
.
/App/sqldrivers/qsqlmysql4.dll"

i already tried this :/

[wysota]

Maybe you were missing something else too, like the MySQL client library.

[KTvsPeacock]

Isn't this the libmysql.dll?
It's in the /App-folder. If I try to put it somewhere else, the application won't start.
Somewhere has to be an entry that tells something like "look only in qt/plugins for plugins no matter what you're supposed to do".

[wysota]

It's in the /App-folder. If I try to put it somewhere else, the application won't start.

It should start. Your main application shouldn't depend on the mysql client library. What does dependency walker say?

[KTvsPeacock]

You were right: it starts without libmysql.dll.
It depends on kernel32, mingwm10, msvcrt, libgcc_s_dw2-1, qtcore4, qtgui4, qtsql4, and qtwebkit4.dll

///
This is what I get, when I call the libraryPaths()-method of my application:
("D:/Programme/Qt/qt/plugins", "C:/Release/nV/release")
So I removed the first path calling removeLibraryPath("D:/Programme/Qt/qt/plugins").
Called librayPath() again, got only the second path and still the application took the dll from the removed path.

[wysota]

But what exactly is the problem with the first path being there?