39 Configuring a Relational Transformation Mapping

This chapter describes the various components that you must configure in order to use a relational transformation mapping.

This chapter includes the following section:

Introduction to Relational Transformation Mapping Configuration

For information on how to configure TopLink mappings options common to two or more mapping types, see Chapter 121, "Configuring a Mapping".

For information on how to create TopLink mappings, see Chapter 120, "Creating a Mapping".

Table 39-1 lists the configurable options for a relational transformation mapping.

39.1 Introduction to Relational Transformation Mapping Configuration

Table 39-1 lists the configurable options for a relational transformation mapping.

Table 39-1 Configurable Options for Relational Transformation Mapping

Option	Oracle JDeveloper	TopLink Workbench	Java
Attribute transformer (see Section 121.15, "Configuring Attribute Transformer")
Field transformer associations (see Section 121.16, "Configuring Field Transformer Associations")
Indirection (lazy loading) (see Section 121.3, "Configuring Indirection (Lazy Loading)")
Mutable Section 121.17, "Configuring Mutable Mappings"
Mapping comments (see Section 121.8, "Configuring Mapping Comments")
Method or direct field access (see Section 121.6, "Configuring Method or Direct Field Accessing at the Mapping Level")
Read-only mapping (see Section 121.2, "Configuring Read-Only Mappings")

Example 39-1 shows how to create a transformation mapping and add it to a descriptor using Java code.

Example 39-1 Transformation Mapping

public void customize(ClassDescriptor descriptor) { 
    TransformationMapping mapping = new TransformationMapping();  

    // configure mapping
    ...   

    // add mapping to descriptor
    descriptor.addMapping(mapping);
}

For more information, see the following: