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# Relational Mappings

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A relational mapping transforms any object data member type to a corresponding relational database (SQL) data source representation in any supported relational database. Relational mappings let you map an object model into a relational data model.

This part contains the following chapters:

- Understanding Relational Mappings

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

- Configuring a Relational Mapping

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

- Configuring a Relational Direct-to-Field Mapping

  This chapter explains how to configure a direct to field relational database mapping.

- Configuring a Relational Direct-to-XMLType Mapping

  This chapter explains how to configure a direct mapping to an Oracle XDB XML type field.

- Configuring a Relational One-to-One Mapping

  This chapter explains how to configure a one-to-one relational database mapping.

- Configuring a Relational Variable One-to-One Mapping

  This chapter explains how to configure a variable one-to-one relational database mapping.

- Configuring a Relational One-to-Many Mapping

  This chapter explains how to configure a one-to-many relational database mapping.

- Configuring a Relational Many-to-Many Mapping

  This chapter explains how to configure a many-to-many relational database mapping.

- Configuring a Relational Aggregate Collection Mapping

  This chapter explains how to configure an aggregate collection relational database mapping.

- Configuring a Relational Direct Collection Mapping

  This chapter explains how to configure a direct collection relational database mapping.

- Configuring a Relational Direct Map Mapping

  This chapter explains how to configure a direct map relational database mapping.

- Configuring a Relational Aggregate Object Mapping

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

- Configuring a Relational Transformation Mapping

  This chapter explains how to configure a transformation relational database mapping.