how to use database value in the variable

[akkarachai]

QString timess;
    QSqlQuery qry;
    qry.prepare("SELECT FROM test WHERE time = '"+timess+"'");
   if (qry.exec()){
        ui->time->setText(timess);
        qDebug("timess");
   };

QString timess;
    QSqlQuery qry;
    qry.prepare("SELECT FROM test WHERE time = '"+timess+"'");
   if (qry.exec()){
        ui->time->setText(timess);
        qDebug("timess");
   };

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This is my code. after I Run ui didn't show anything.

I create timess with qstring and store the time value from database(SQLite) into it's.
But in the time ui (QLable) didn't show anything after I run the process.