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# Object-Relational Mappings

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An object-relational mapping transforms certain object data member types to structured data source representations optimized for storage in specialized object-relational databases (such as Oracle Database). Object-relational mappings let you map an object model into an object-relational data model.

This part contains the following chapters:

- Understanding Object-Relational Mappings

  This chapter describes each of the different TopLink object-relational mapping types and important object-relational mapping concepts.

- Configuring an Object-Relational Mapping

  This chapter explains how to configure TopLink object-relational mapping options common to two or more object-relational mapping types.

- Configuring an Object-Relational Reference Mapping

  This chapter explains how to configure a reference object-relational mapping.

- Configuring an Object-Relational Nested Table Mapping

  This chapter explains how to configure a nested table object-relational mapping.

- Configuring an Object-Relational Object Array Mapping

  This chapter explains how to configure an object array object-relational mapping.

- Configuring an Object-Relational Structure Mapping

  This chapter explains how to configure a structure object-relational mapping.

- Configuring an Object-Relational Array Mapping

  This chapter explains how to configure an array object-relational mapping.