Known to work with:

  • Slackware v13.37
  • Qt SDK v1.1.5 (32 bit)
  • Qt v4.8.0
  • MySQL v5.5.18

Please follow this guide properly:

  1. Download Qt SDK for Linux/X11 at Qt Software.

  2. Install it anywhere you want, just make sure you remember the path. I installed mine at /opt.

  3. To build MySQL as a plugin, you need to know two other paths:

    MySQL header directory’s files example:

    decimal.h   m_string.h      my_dbug.h    my_list.h        my_sys.h     mysql_embed.h    mysqld_error.h  sql_state.h        typelib.h
errmsg.h    my_alloc.h      my_dir.h     my_net.h         my_xml.h     mysql_time.h     raid.h          sslopt-case.h
keycache.h  my_attribute.h  my_getopt.h  my_no_pthread.h  mysql.h      mysql_version.h  readline.h      sslopt-longopts.h
m_ctype.h   my_config.h     my_global.h  my_pthread.h     mysql_com.h  mysqld_ername.h  sql_common.h    sslopt-vars.h

    MySQL library directory’s files example:

    libdbug.a    libmyisammrg.a      libmysqlclient.so@         libmysqlclient_r.a    libmysqlclient_r.so.15@      libmysys.a
libheap.a    libmysqlclient.a    libmysqlclient.so.15@      libmysqlclient_r.la*  libmysqlclient_r.so.15.0.0*  libvio.a
libmyisam.a  libmysqlclient.la*  libmysqlclient.so.15.0.0*  libmysqlclient_r.so@  libmystrings.a

  4. I installed my MySQL at /opt, so those files will be in:

    # Headers directory
/opt/mysql-5.5.18-linux2.6-i686/include/

# Libraries directory
/opt/mysql-5.5.18-linux2.6-i686/lib

  5. Go to your main Qt SDK installation’s path:

    cd /opt/QtSDK/
cd QtSources/4.8.0/src/plugins/sqldrivers
# Replace all the path based on your computer environment.
/opt/QtSDK/Desktop/Qt/4.8.0/gcc/bin/qmake -o Makefile "INCLUDEPATH+=/opt/mysql-5.5.18-linux2.6-i686/include/" "LIBS+=-L/opt/mysql-5.5.18-linux2.6-i686/lib -lmysqlclient" mysql.pro
make
/opt/QtSDK/Desktop/Qt/4.8.0/gcc/bin/qmake "INCLUDEPATH+=/opt/mysql-5.5.18-linux2.6-i686/include/" "LIBS+=-L/opt/mysql-5.5.18-linux2.6-i686/lib -lmysqlclient_r" mysql.pro
make
make install

  6. Some files with mysql in the name will be copied in your sqldrivers path:

    /opt/QtSDK/Desktop/Qt/4.8.0/gcc/plugins/sqldrivers

  7. Before trying your MySQL coding, please make sure libmysqlclient.so is in the LD_LIBRARY_PATH.

  8. Create a new project and put these codes to test your new plugin.

    QT       += core sql
QT       -= gui

TARGET    = mysql
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

    Make sure you have mysql included in your .pro file.

    #include <QCoreApplication>
#include <QtSql>

int main(int argc, char *argv[])
{
  QCoreApplication a(argc, argv);

  qDebug() << QSqlDatabase::drivers();

  return a.exec();
}

    You should get QMYSQL in the outputs when you ran the application:

    ("QSQLITE", "QMYSQL3", "QMYSQL")

    You can find my info at http://qt-project.org/doc/qt-4.8/sql-driver.html.