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--- at-m42:lecture14 [2009/04/26 10:07] – eechris
+++ at-m42:lecture14 [2009/04/26 10:10] – eechris
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-===== The Object/Relational Impedance Mismatch =====
-  * For all but the simplest domain models, there is no direct match from relational database to object model.
-  * OO concepts such as class, //polymorphism//, and //inheritance// have no direct analogy in an RDMS.
-  * RDMS concepts such as //normalized data//, //sets// and //efficient access// have no direct relationship in the OO world.
-  * It's best to keep the two worlds separate and in the domain of the experts.
-  * Use an ORM framework (if it's appropriate) to provide the bridge between the two worlds.
 ===== Some Issues that the Developers of an ORM Have to be Aware Of =====
   * //Identity//: ensuring a record in a database is unique in a global sense.