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Transactions ACID Advice

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I am executing a transaction against a single database.
Connection.setAutocommit(false); // for ATOMICITY of ACID
Connection.setIsolationLevel(TRANSACTION_READ_COMMITTED); // for ISOLATION of ACID

I guess setAutocommit(false); is a Must FOR the 2nd stage... true?
B'cos I have some special insert queries which must execute in autocommit(true) modus. But I am handling all the DB-Story in a central way. I donot want to write extra if else else code for only those special conditions; in which I just do some insert and I am sure at least one of the fields of the indexes that are used will have a different value..
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