Solving the Java object storage problem

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Solving the Java object storage problem

• By Imtiyaz Ahmed Qureshi

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Problem in Object storage

• It is not possible to manipulate an individual
  object
• Object serialization lacks fundamental database
  capabilities
• Persistence can be defined as a network of
  persistent
• objects whose root is serializable. Any
  object
• that a persistent object can touch
  automatically
• becomes persistent and thus a member of the
  network.

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ODMG Binding

• The ODMG binding for Java and JDBC is good
  alternative for persistent object development
  with Java.
• The ODMG Binding for Java specification enables
  developers to simply and easily build
  cross-platform Java applications that
  automatically store Java objects in database
• ODMG is based on concept of database transparency
• It allows the developers to manipulate with
  Database

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products that presently support the ODMG Java
Binding
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Object manipulation language (OML)

• The Java Object Manipulation Language (OML) is
  the set of classes and other constructs that are
  added to the Java environment to support the ODMG
  object model with collections, transactions, and
  databases.
• To use the ODMG binding, the developer specifies
  persistent Java classes. The database then
  automatically stores instances of persistent
  classes

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The Architecture of An ODMG Application
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Costume adopter classes
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Initializing ODMG

• Implementation odmg OJB.getInstance()
  Database db odmg.newDatabase()
  db.open("default", Database.OPEN_READ_WRITE) /
  ... use the database ... / db.close()

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Persistant new objects

• public static void storeNewProduct(Product
  product)
• // get the used Implementation instance
• Implementation odmg ...
• Transaction tx odmg.newTransaction()
• tx.begin() // get current used Database instance
  
• Database db odmg.getDatabase(null) // make
  persistent new object db.makePersistent(product)
  
• tx.commit()

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• Thank you