ROR ActiveRecord like interface for Apache Cayenne
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Key: CAY-877
URL: https://issues.apache.org/cayenne/browse/CAY-877
Project: Cayenne
Issue Type: New Feature
Affects Versions: 2.0 [STABLE]
Reporter: David Marko
Assignee: Andrus Adamchik
Priority: Minor
ROR ActiveRecord like interface for Cayenne. Solution tries to bring
alternative syntax for working with Apache Cayenne subsystem. Though its
working its still subject of discussion and improvement. My idea is not to
create other AR like ORM in JAVA but rather create AR like interface for
existing ORM. I expect discussion on additional methods that will conform the
concept.
The solution requires Java 5 as generics and some other features are being
used. Here are just a few code snippets of how it can be used.
Syntax examples:
EntityManager em=new EntityManager();
em.setContext(DataContext.createDataContext());
// create and save object
Contact contact=em.create(Contact.class);
em.saveChanges();
// find object by id
Contact contact=em.findById(Contact.class, id);
// find object by property
Contact contact=em.findFirstByProperty(Contact.class, "username",
form.getFieldValue("username"));
// find many objects by property
List contacts=em.findAllByProperty(Contact.class, "subdomain.name",
"subdomain");
// find objects based on user defined query
List contacts=em.findAllByQuery(Contact.class,
Query.select().where("subdomain = $subdomain
and age > $age")
.param("subdomain", "agh")
.param("age", 18)
.order("lastname",true)
.offset(200)
.limit(10)
.include(Contact.ROLE_ARRAY_PROPERTY));
// count items per invoice
List counts=em.count(Item.class, "invoice_id")
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