33 Configuring a Relational One-to-Many Mapping

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

This chapter includes the following section:

Introduction to Relational One-to-Many Mapping Configuration

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

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

Table 33-1 Opens a new window lists the configurable options for a relational one-to-many mapping.

33.1 Introduction to Relational One-to-Many Mapping Configuration

Table 33-1 Opens a new window lists the configurable options for a relational one-to-many mapping.

Table 33-1 Configurable Options for Relational One-to-Many Mapping

Option	Oracle JDeveloper	TopLink Workbench	Java
Reference descriptor (see Section 28.4, "Configuring Reference Descriptor")
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")
Private or Independent relationships (see Section 121.7, "Configuring Private or Independent Relationships")
Batch reading (see Section 28.5, "Configuring Batch Reading")
Indirection (lazy loading) (see Section 121.3, "Configuring Indirection (Lazy Loading)")
Bidirectional relationship (see Section 121.18, "Configuring Bidirectional Relationship")
Container policy (see Section 121.14, "Configuring Container Policy")
Mapping comments (see Section 121.8, "Configuring Mapping Comments")
Table and field references (see Section 28.7, "Configuring Table and Field References (Foreign and Target Foreign Keys)")
Query key order (see Section 28.6, "Configuring Query Key Order")

Example 33-1 Opens a new window shows how to create a one-to-many mapping and add it to a descriptor using Java code.

Example 33-1 One-to-Many Mapping

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

    // configure mapping
    ...   

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

For more information, see the following:

For information on using JPA to configure one-to-many mappings, see "@OneToMany" section of EclipseLink Developer's Guide at http://wiki.eclipse.org/Introduction_to_EclipseLink_JPA_%28ELUG%29#.40OneToMany.

Page 51 of 158