Implementing the Executable Conceptual Model ( ECM )
نویسنده
چکیده
The term was created by Peter Chen to describe a data infrastructure (database) which is directly based on the conceptual (i.e. Entity-Relationship) model. Conceptual models are the generally accepted approach to design abstract models of the real world. ECM takes this concept one step further and uses a conceptual model also at the instance level. The conversion of a conceptual model to tables of the relational model results in loss of semantics and creates the so called "impedance mismatch". In contrast to object-relational mappers the ECM does not try to bridge the impedance mismatch – it simply does not create it.
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