dbtool dbExists

static bool dbExists(QString db_name)
{
    bool ret{false};
    {
        QSqlDatabase segs_db(QSqlDatabase::addDatabase("QMYSQL", db_name));
        QSqlQuery query(segs_db);
        segs_db.setDatabaseName(db_name);
        segs_db.setHostName(config.s_host);
        segs_db.setPort(config.s_port.toInt());
        segs_db.setUserName(config.s_user);
        segs_db.setPassword(config.s_pass);
        segs_db.open();
        query.exec("show tables");
        if(query.size() >= 1){
            ret = true;
        }
        segs_db.close();
    }
    QSqlDatabase::removeDatabase(db_name);
    return ret;
}