JDO

• Define the term persistent data
• Explain the function of the:
  • PersistenceManager
  • Enhancer
  • Extent
  • PersistenceManagerFactory
  • JDOHelper
• Explain why JDO abstracts the persistent memory medium
• Explain the function of the Query Component
• Explain the function of the Transaction Component
• Explain the advantages and disadvantages of using the interface PersistenceCapable
• Explain the advantages and disadvantages of using an Enhancer
• Identify classes that are not supported to be made persistent
• Explain the difference between the terms persistent and transient
• Explain the terms datastore identity and application identity
• Explain the terms persistent capable and persistent aware

Use the following tags to store objects:

• <field>
• <class>
• <package>
• <collection>

Identify correct locations and names of the .jdo metadata file.

• Use the class PersistenceManagerFactory to get an instance of the class PersistenceManager
• Write code that uses the class PersistenceManager to store objects on the persistent medium
• Write code that uses the class PersistenceManager to delete objectes from the persistent medium

• Use the class to get a reference to a PersistenceManagerFactory
• Use the class to get a reference to a PersistenceManager that is associated with a given persistent object

• Use the class Extent to seach for all objects of a class
• Use the class Query to search for objects,which fulfil defined conditions

• Use the class Transaction to provide basic transactional behavior in your code
• Write code that is able to deactivate transactions
• Write code that uses the different transactional settings and know their impacts on transactions
• Identify the two types of transactions (pessimistic,optimistic)

• Define queries that use logical and arithmetical operators
• Define queries that declares parameters
• Define queries that uses the JDO-QL API methods
• Identify the required and optional query elements

• Write code that implements the interface PersistenceCapable correctly