[Xapian-discuss] Xapian::DatabaseModifiedError caused within transaction

[Hightman(马明练)]

For some reasons, my document was updated by users. When the update action(delete + add) multiple called within one transaction, There is DatabaseModifiedError taken place always. the produced code such as:

database.begin_transaction();
..
database.delete_document(unique_term);
database.add_document(doc1);
..
database.delete_document(unique_term);
database.add_document(doc2);
..
database.commit_transaction();


When after these codes, the databases(flint backend) must be broken for 'DatabaseModifiedError' (The revision being read has been discarded - you should call Xapian::Database::reopen() and retry the operation)

What can I do for these errors?