Question

hi i have an application in which i first check the value in the DB table if not present generate a new value and insert into the DB,this loop goes around a million times,how can i speed it up??

in my working class:-

session=HibernateSessionFactory.getSession();       
    for(----loop 

    i check

    i generate

    then:-

    MyTable myTable=new MyTable();
            myTable.setName("dasdas");
            myTable.setww("ss");
            myTable.setaa("daaasdas");

    hibernateRepositoy.save(dgCcno,session);

}

save method i the other class:-

  public void save(Object obj,Session session)  {       

            Transaction tx = null;
            try {
                tx = session.beginTransaction();
                session.saveOrUpdate(obj);
                session.flush();

                session.clear();
                tx.commit();
            }
            catch (HibernateException e) {
                e.printStackTrace();
                logger.error(e.getMessage(), e);            

                if(tx!=null){
                    tx.rollback();
                }
            } 
            catch (Exception e) {
                e.printStackTrace();

                logger.error(e.getMessage(), e);        

            }
        } 

how can i speed this up, or is this the right approach?

Added:- i cant use batch update, i have to insert the value right away, cause the values in the next select query can be the same.. and have to give the value from the DB then

Answer 1

• don’t use one transaction per row, but include everything (or at least significant subsets) in a single transaction
• issue a single query to verify the existence of several rows at once
• follow the advices of the reference documentation