impedance mismatch

English

Etymology

Derived from the concept of impedance matching in electrical engineering.

Noun

impedance mismatch (plural impedance mismatches)

  1. (object-oriented programming) A set of conceptual and technical difficulties that are often encountered when a relational database is being served by an object-oriented application program, particularly because objects or class definitions must be mapped to database tables defined by a relational schema.
    • 1997, Bhavani M. Thuraisingham, Data Management Systems: Evolution and Interoperation, CRC Press, →ISBN, page 33:
      Some argue that having impedance mismatch is difficult for programming intensive applications.
    • 2002, Jim Melton, Advanced SQL:1999: Understanding Object-Relational and Other Advanced Features, Morgan Kaufmann, →ISBN, page 353:
      But the impedance mismatch between SQL and Java was no better than between SQL and other languages.
    • 2004, Scott W. Ambler, The Object Primer: Agile Model-Driven Development with UML 2.0, Cambridge University Press, →ISBN, page 442:
      Why does a technological impedance mismatch exist?

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