29 Configuring a Relational Direct-to-Field Mapping

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

This chapter includes the following section:

Introduction to Relational Direct-to-Field 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 29-1 lists the configurable options for a relational direct-to-field mapping.

29.1 Introduction to Relational Direct-to-Field Mapping Configuration

Table 29-1 lists the configurable options for a relational direct-to-field mapping.

Table 29-1 Configurable Options for Relational Direct-to-Field Mapping

Option to Configure	Oracle JDeveloper	TopLink Workbench	Java
Database field (see Section 28.3, "Configuring a Database Field")
Method or direct field access (see Section 121.6, "Configuring Method or Direct Field Accessing at the Mapping Level")
Default null value (see Section 121.5, "Configuring a Default Null Value at the Mapping Level")
Read-only (see Section 121.2, "Configuring Read-Only Mappings")
Mapping comments (see Section 121.8, "Configuring Mapping Comments")
Serialized object converter (see Section 121.9, "Configuring a Serialized Object Converter")
Type conversion converter (see Section 121.10, "Configuring a Type Conversion Converter")
Object type converter (see Section 121.11, "Configuring an Object Type Converter")

Example 29-1 shows how to create a direct-to-field mapping and add it to a descriptor using Java code.

Example 29-1 Direct-to-Field Mapping

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

    // configure mapping
    ...   

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

For more information, see the following: