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# EIS Mappings

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TopLink enterprise information system (EIS) mappings provide support for accessing legacy data sources and enterprise applications through J2EE Connector architecture (J2C) adapter. TopLink EIS mappings use the J2C Common Client Interface (CCI) to access the EIS through its resource adapter. This provides the ability to directly map from an existing Java object model to any transactional data source, such as mainframes with flat file/hierarchical data. An EIS mapping transforms object data members to the EIS record format defined by the object's descriptor.

This part contains the following chapters:

- Understanding EIS Mappings

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

- Configuring an EIS Mapping

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

- Configuring an EIS Direct Mapping

  This chapter explains how to configure a direct EIS mapping.

- Configuring an EIS Composite Direct Collection Mapping

  This chapter explains how to configure a direct collection EIS mapping.

- Configuring an EIS Composite Object Mapping

  This chapter explains how to configure a composite object EIS mapping.

- Configuring an EIS Composite Collection Mapping

  This chapter explains how to configure a composite collection EIS mapping.

- Configuring an EIS Transformation Mapping

  This chapter explains how to configure a transformation EIS mapping.

- Configuring an EIS One-to-One Mapping

  This chapter explains how to configure a one-to-one EIS mapping.

- Configuring an EIS One-to-Many Mapping

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