Examples of oracle.toplink.essentials.descriptors.RelationalDescriptor

• oracle.toplink.essentials.descriptors.RelationalDescriptor

  Purpose: TopLink has been designed to take advantage of the similarities between relational databases and objects while accommodating for their differences, providing an object oriented wrapper for relational databases. This is accomplished through the use of Descriptors. A descriptor is a pure specification class with all its behaviour deputized to DescriptorEventManager, DescriptorQueryManager and ObjectBuilder. Look at the following variables for the list of specification on the descriptor.

  A Descriptor is a set of mappings that describe how an objects's data is to be represented in a relational database. It contains mappings from the class instance variables to the table's fields, as well as the transformation routines necessary for storing and retrieving attributes. As such the descriptor acts as the link between the Java object and its database representaiton.

  Every descripor is initialized with the following information:

  • The Java class its describes, and the corresponding table(s) for storing instances of the class.
  • The primary key of the table.
  • A list of query keys for field names.
  • A description of the objects's attributes and relationships. This information is stored in mappings.
  • A set of user selectable properties for tailoring the behaviour of the descriptor.

  This descriptor subclass should be used for object-relational mapping, and allows for other datatype mappings to be done in the XML, EIS and OR sibling classes. @see DescriptorEventManager @see DescriptorQueryManager @see InheritancePolicy @see InterfacePolicy

Related Classes of oracle.toplink.essentials.descriptors.RelationalDescriptor