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Object-Relational Mapping

An ORM maps classes to tables and objects to rows, generating SQL from object navigation; related objects are typically lazy-loaded on first access. The abstraction hides which statements run and when, which is convenient until the generated access pattern (not the SQL you would have written) becomes the bottleneck.

Questions this Concept answers

Why can a mapper hide the most important fact about a page's performance?

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Mapping Java Class Fields to Relational Database Columns with Object Relational Mapping

Object-relational mapping (ORM) is a programming technique that establishes a correspondence between the fields of application domain-model classes and the columns of relational database tables, so t…