2.3. Object-Relational Mapping
Object-Relational (O/R) mapping is a technique to map between developed Java classes and relational databases. Java relations between objects, classes, and their fields have to be mapped somehow to database relations, tables, and columns in a relational database.
An object-oriented domain model of business entities is sometimes compromised for technical reasons like performance or space requirements when the application matures. In this case, object-relational mapping is also a technique to reengineer complex, existing database models. The object-oriented “is-a” and “has-a” relationships can only be poorly mapped to relational databases, where a record or related information often spans a number of tables and has ...
Get Core Java™ Data Objects now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
