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Oracle® Application Server TopLink Mapping Workbench User's Guide
10g Release 2 (10.1.2)
Part No. B15900-01
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Working with Direct Mappings

There are two basic ways of storing object attributes directly in a database table:

OracleAS TopLink furnishes the following classes of direct mappings:

If the application's objects contain attributes that cannot be represented as direct-to-field, type conversion, or object-type mappings, then the application must provide transformation routines for saving the attributes.

If a direct-to-field mapping cannot be used to perform the desired conversion, try type conversion and object type mappings before attempting to define a custom transformation mapping.