Configuring an Object-Relational Data Type Descriptor (ELUG)

Related Topics

For information on how to create object-relational data type descriptors, see Creating an Object-Relational Data Type Descriptor.

This table lists the configurable options for an object-relational data type descriptor.

Option to Configure	EclipseLink Workbench	Java
Field ordering
Primary keys
Read-only descriptors
Unit of work conforming
Query keys
Cache expiration
Amendment methods
Reading subclasses on queries
Inheritance for a child class descriptor
Inheritance for a parent class descriptor
Inheritance expressions for a parent class descriptor
Inherited attribute mapping in a subclass
Cache type and size
Domain object method as an event handler
Descriptor event listener as an event handler
Locking policy
Copy policy
Instantiation policy
Wrapper policy
History policy
Returning policy

For more information, see Introduction to Relational Descriptors.

Configuring Field Ordering

If your object-relational data type data source driver uses JDBC indexed arrays, you can specify the order in which EclipseLink persists object attributes to define the field index.

How to Configure Field Ordering Using Java

Use ObjectRelationalDescriptor method addFieldOrdering to specify the field ordering. This example shows how to specify the order of the object-relational data type database fields OBJECT_ID, F_NAME, and L_NAME for the Employee descriptor.

Field Ordering

 descriptor.addFieldOrdering("ID");
 descriptor.addFieldOrdering("F_NAME");
 descriptor.addFieldOrdering("L_NAME");

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