I am inserting using this code

Qt Code: 
  1. QTime timex;
  2.     timex.start();
  3.  
  4.     //    static int i = 0;
  5.     QString query = TableQueries::insertDataQuery();
  6.     qDebug() << ++i;
  7.  
  8.     qDebug() << "::> " << timex.elapsed();
  9.     db_query.prepare(query);
  10.     qDebug() << ":::> " << timex.elapsed();
  11.  
  12.     int pos = 0;
  13.     db_query.bindValue(pos++, Id);
  14.     db_query.bindValue(pos++, date);
  15.     db_query.bindValue(pos++, time);
  16.     db_query.bindValue(pos++, value);
  17.  
  18.     qDebug() << "::::> " << timex.elapsed();
  19.     bool exec = db_query.exec();
  20.     qDebug() << ":::::> " << timex.elapsed();
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And the frequency of my data is around 12000 records/Second.
Then how can transaction be achieved?