Relational Mapping Types

TopLink supports the relational mappings listed in Table 36-1.

Table 36-1 TopLink Relational Mapping Types

Type	Description	Type	TopLink Workbench	Java
"Direct-to-Field Mapping"	Map a Java attribute directly to a database field.	Basic
"Direct to XMLType Mapping"	Map Java attributes to an XMLType column in an Oracle Database (introduced in version 9.2.0.1).	Advanced
"One-to-One Mapping"	Map a reference to another persistent Java object to the database.	Basic
"Variable One-to-One Mapping"	Map a reference to an interface to the database.	Basic
"One-to-Many Mapping"	Map Java collections of persistent objects to the database.	Advanced
"Many-to-Many Mapping"	Use an association table to map Java collections of persistent objects to the database.	Advanced
"Aggregate Collection Mapping"	Map Java collections of persistent objects to the database.	Basic
"Direct Collection Mapping"	Map Java collections of objects that do not have descriptors.	Basic
"Direct Map Mapping"	Direct map mappings store instances that implement java.util.Map.	Basic
"Aggregate Object Mapping"	Create strict one-to-one mappings that require both objects to exist in the same database row.	Basic
"Transformation Mapping"	Create custom mappings where one or more fields can be used to create the object to be stored in the attribute.	Basic