Is neccesary to use commit()...when you use stmt.executeUpdate(sentence);?

Is neccesary to use commit()..... when you use
stmt.executeUpdate(sentence);
and the sentence is by example:
sentence = "delete from table_X where ELEMENT1 = 'hi'"; ????
This is because...i did a servlet in which i send a sentence (the sentence could be insert or delete).....and apparently it is working very well....i can see that the rows are added or removed in the DB table...but i am a little confused...because in a paper says "modifications in tuples are temporarily stored in the db system. They become permanent only after the statement commit has been issued"
and i am not calling commit in my servlet.....
Thanks in advance,
Mary

AFAIK, by default, Connection objects have their auto-commit feature enabled.
So, assuming your database supports transactions, every operation will be commited automatically by the JDBC driver's code.
To turn it off, you must call:
connection.setAutoCommit( false );
By doing so, you will need to call commit() in your code if you want to make those changes permanent.
HTH

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Is neccesary to use commit()...when you use stmt.executeUpdate(sentence);?

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