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Difference between revisions of "EclipseLink/UserGuide/JPA/Introduction/Object-Persistence Impedance Mismatch"

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{{EclipseLink_UserGuide
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'''[[Image:Elug_draft_icon.png|Warning]] See "What Is the Object-Persistence Impedance Mismatch?" in the [http://www.eclipse.org/eclipselink/documentation/ EclipseLink Concepts Guide]'''
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=Object-Persistence Impedance Mismatch=
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Java-to-data source integration is a widely underestimated problem when creating enterprise Java applications. This complex problem involves more than simply reading from and writing to a data source. The data source elements include tables, rows, columns, and primary and foreign keys. The Java and Java EE include entity classes, business rules, complex relationships, and inheritance. In a nonrelational data source, you must match your Java entities with EIS records or XML elements and schemas. These differences (as shown in the following figure) are known as the object-persistence impedance mismatch.
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'''''Solving Object-Persistence Impedance Mismatch'''''
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[[Image:mismatch.gif|Solving Object-Persistence Impedance Mismatch]]
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Successful solution requires bridging these different technologies, and solving the object-persistence impedance mismatch–a challenging and resource-intensive problem. To solve this problem, you must resolve the following issues between Java EE and data source elements:
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* Fundamentally different technologies.
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* Different skill sets.
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* Different staff and ownership for each of the technologies.
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* Different modeling and design principles.
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As an application developer, you need a product that lets integrate Java applications with any data source, without compromising ideal application design or data integrity. In addition, as a Java developer, you need the ability to store (that is, '''persist''') and retrieve business domain objects using a relational database or a nonrelational data source as a repository.
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==EclipseLink Solution==
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EclipseLink addresses the disparity between Java objects and data sources. EclipseLink is a persistence framework that manages relational, object-relational data type, EIS, and XML mappings in a seamless manner. This lets you rapidly build applications that combine the best aspects of object technology and the specific data source. EclipseLink lets you do the following:
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* Persist Java objects to virtually ''any'' relational database supported by a JDBC-compliant driver.
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* Persist Java objects to virtually ''any'' nonrelational data source supported by a Java EE Connector architecture (JCA) adapter using indexed, mapped, or XML enterprise information system (EIS) records.
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* Perform in-memory conversions between Java objects and XML Schema (XSD) based XML documents using JAXB.
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* Map ''any'' object model to ''any'' relational or nonrelational schema, using EclipseLink and JPA integration with several tools including [http://www.eclipse.org/webtools/dali/ Eclipse Dali], [http://www.oracle.com/technology/products/jdev/index.html Oracle JDeveloper], or [http://netbeans.org/ NetBeans].  The Workbench, a graphical mapping tool is also provided for backward compatibility for projects using the EclipseLink native API.
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* Use EclipseLink successfully, even if you are unfamiliar with SQL or JDBC, because EclipseLink offers a clear, object-oriented view of data sources.
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{{EclipseLink_JPA
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|previous=[[EclipseLink/UserGuide/JPA|About EclipseLink]]
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|next=[[EclipseLink/UserGuide/JPA/Introduction/Architecture|Architecture]]
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|up=[[EclipseLink/UserGuide/JPA/Introduction|Introduction]]}}
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Latest revision as of 08:06, 18 January 2013

Warning See "What Is the Object-Persistence Impedance Mismatch?" in the EclipseLink Concepts Guide