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Can someone explain, in layman terms, what is Object/relational mapping(ORM) in relation to Hibernate and JDBC?
Diagrams would be especially helpful for understanding…
EDIT: I found this via google for Hibernate ORM, can someone confirm that it is accurate and a good representation of how ORM is used.
ORM allows you to use java objects as representation of a relational database. It maps the two concepts (object-oriented and relational)
Hibernate is an ORM framework – you describe how your objects are represented in your database, and hibernate handles the conversion.
JDBC is the API for database access, and it works “in a relational way” – you query tables and get rows and columns back. Hibernate uses JDBC under the hood to fetch the data and later convert it to objects.
A jdbc
ResultSethas multiple records, and each record has a set of columns. In hibernate this becomes ofList<SomeClass>whereSomeClass has a field for every column in the database table, and there is one instance ofSomeClass` per database record.