c++ - QSqlDatabase check the data base already exist -

i need sore value on system locally , access later in table format, chose qsqldatabase. , first have check database exist. using below code getting message data base not exist creating new.... can problem ?

#include <qtcore/qcoreapplication> #include <qtsql/qsqldatabase> #include "qfile" #include "qdebug"  int main(int argc, char *argv[]) {     qcoreapplication a(argc, argv);     qstring dbname = "lprdb";     qsqldatabase db = qsqldatabase::adddatabase("qsqlite");      if( qfile::exists(dbname))     {          qdebug()<<"data base exist....";     }     else {         qdebug()<<"data base not exist creating new....";         db.setdatabasename(dbname);     }      return a.exec(); } 

as noted @armatel, should open db, create db file.

#include <qtcore/qcoreapplication>   #include <qtsql/qsqldatabase> #include "qfile" #include "qdebug"  int main(int argc, char *argv[]) {     qcoreapplication a(argc, argv);     qstring dbname = "lprdb";     qsqldatabase db = qsqldatabase::adddatabase("qsqlite");      if( qfile::exists(dbname))     {         qdebug()<<"data base exist....";     }     else {         qdebug()<<"data base not exist creating new....";         db.setdatabasename(dbname);         db.open(); // <<< add this!          if(!db.isopen()) {             qdebug() << "error: not open database";         }         qdebug() << "db opened";     }      return a.exec(); }