Continuing his mini-series on Hibernate and JPA, Stephen Morris tackles more complex object relational mapping (ORM) techniques. This includes entity and value type component mapping and database design workflow.
These days, it’s essential to have a strong knowledge of object relational mapping. This reflects the need for retaining application data long after the application has run. As the need for data storage grows, so too does the need to work with legacy databases or schemas. A schema is simply a description of a database—i.e., its tables, data types, constraints, etc.
Before working with legacy schemas, it’s sometimes necessary to learn more complex mapping techniques. This knowledge will help you in working around what are often quirky legacy schemas. Very often, it’s simply not an option to modify a legacy schema.
A key concept in object relational mapping is the difference between entity and value types. Let’s now look at this concept.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment