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Doubt....



Hello,
 
1. If I change the class whose object is stored in the database, I am not able to access the database. But I could access it,  if I create the database again. What should be done to access the database without deleting it or Do we have some other way?
2.  While storing the objects in the database, Is it not necessary to commit it?
 
thanx
 
bye
priyaa