Installed the community version of Qt 5.6 in Ubuntu 16.04. There is also Qt 4.8 in it and there are no problems with it. I tried to figure it out on my own , but the result is not yet apparent.

#include <QtCore/QCoreApplication> #include <db_connect.h> #include <debugapi.h> #include <action_user.h> #include <QDebug> #include <QPluginLoader> int main(int argc, char *argv[]) { //Создание объекта консольного приложения QCoreApplication a(argc, argv); //DB_connect::createConnection(); //Создание объекта сервера //QSimpleServer server; //Запуск цикла обработки событий QPluginLoader loader; loader.setFileName("/home/alexandr/Qt/5.6/gcc_64/plugins/sqldrivers/libqsqlmysql.so"); qDebug() << loader.load(); qDebug() << loader.errorString(); QStringList PathList = a.libraryPaths(); PathList.append(a.applicationDirPath() + "/plugins"); a.setLibraryPaths(PathList); qDebug() << a.libraryPaths().join(";"); Action_user action; DebugAPI api; action.CommandSplit(api.addUser()); qDebug () << api.addUser(); return a.exec(); }

Output to console:

 false "Cannot load library /home/alexandr/Qt/5.6/gcc_64/plugins/sqldrivers/libqsqlmysql.so: (libssl.so.10: cannot open shared object file: No such file or directory)" "/home/alexandr/Qt/5.6/gcc_64/plugins;/home/alexandr/Documents/Job/build-ThreadedServer-Desktop_Qt_5_6_0_GCC_64bit-Debug;/home/alexandr/Documents/Job/build-ThreadedServer-Desktop_Qt_5_6_0_GCC_64bit-Debug/plugins" addUser QSqlDatabase: QMYSQL driver not loaded QSqlDatabase: available drivers: QSQLITE QPSQL QPSQL7 ("QSQLITE", "QPSQL", "QPSQL7") Cannot open database: QSqlError("", "Driver not loaded", "Driver not loaded") ~/Qt/5.6/gcc_64/plugins/sqldrivers$ objdump -x libqsqlmysql.so | grep NEEDED NEEDED libmysqlclient_r.so.16 NEEDED libz.so.1 NEEDED libcrypt.so.1 NEEDED libnsl.so.1 NEEDED libssl.so.10 NEEDED libcrypto.so.10 NEEDED libQt5Sql.so.5 NEEDED libQt5Core.so.5 NEEDED libpthread.so.0 NEEDED libstdc++.so.6 NEEDED libm.so.6 NEEDED libgcc_s.so.1 NEEDED libc.so.6

It is:

 /usr/lib/libmysqlclient_r.so.16 /lib/i386-linux-gnu/libz.so.1 /lib/x86_64-linux-gnu/libz.so.1 /lib32/libnsl.so.1 /libx32/libnsl.so.1 /lib/i386-linux-gnu/libnsl.so.1 /lib/x86_64-linux-gnu/libnsl.so.1 /lib32/libpthread.so.0 /libx32/libpthread.so.0 /lib/i386-linux-gnu/libpthread.so.0 /lib/x86_64-linux-gnu/libpthread.so.0 /usr/lib32/libstdc++.so.6 /usr/libx32/libstdc++.so.6 /usr/lib/i386-linux-gnu/libstdc++.so.6 /usr/lib/x86_64-linux-gnu/libstdc++.so.6 /usr/lib/libssl.so.10 /usr/lib/libcrypto.so.10 /usr/lib/libQt5Sql.so.5 /usr/lib/libQt5Core.so.5 /usr/lib/libstdc++.so.6 /usr/lib/libgcc_s.so.1 /lib32/libm.so.6 /libx32/libm.so.6 /lib/i386-linux-gnu/libm.so.6 /lib/x86_64-linux-gnu/libm.so.6 /lib32/libc.so.6 /libx32/libc.so.6 /lib/i386-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6

    1 answer 1

     sudo apt-get install libssl1.0.0 libssl-dev sudo ln -s /lib/x86_64-linux-gnu/libssl.so.1.0.0 /usr/lib/libssl.so.10 sudo ln -s /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 /usr/lib/libcrypto.so.10