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Regarding this, there is a JEE design pattern, called the DAO pattern.These instances are instantiated from the concrete DAO classes by the Io C container at runtime. Each DAO method must obtain a instance, start a transaction, perform the persistence operation, and commit the transaction.Therefore, the service object is unaware of the actual DAO implementation details. Additionally, each DAO method should include its own duplicated exception-handling implementation.Our discussion starts with the Data Access Object (DAO) pattern.
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