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Apache Cayenne
Intro
Ilya Drabenia
Software Engineer,
ObjectStyle LLC
What is
Cayenne?
• GUI tool for design entities and
schema
• Code First and Schema First mapping
• Good integration with ant and maven
• Great support of unit and integration
testing
• Support of multi-tenancy and SaaS
• Support of Dependency Injection
Five minutes
tutorial
Desi
gn
Genera
te
Five minutes
tutorial
That’s all! Model ready to use!
Five minutes
tutorial
Main
class
package org.example.cayenne;
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.access.DataContext;
public class Main {
public static void main(String[] args) {
ObjectContext context = DataContext.createDataContext();
}
}
Five minutes
tutorial
Let’s create new entities
Specify relationships
Gallery metropolitan =
context.newObject(Gallery.class);
metropolitan.setName("Metropolitan Museum of
Art");
Painting girl = context.newObject(Painting.class);
girl.setName("Girl Reading at a Table");
picasso.addToPaintings(girl);
picasso.addToPaintings(stein);
girl.setGallery(metropolitan);
stein.setGallery(metropolitan);
And commit changes
context.commitChanges();
Five minutes
tutorial
Let’s query Picasso entity
And delete it
Expression qualifier = ExpressionFactory.matchExp(Artist.NAME_PROPERTY, "Pablo Picasso");
SelectQuery select = new SelectQuery(Artist.class, qualifier);
Artist picasso = (Artist) DataObjectUtils.objectForQuery(context, select);
if (picasso != null) {
context.deleteObject(picasso);
context.commitChanges();
}
Cayenne
Modeler
Cayenne
Modeler
Main features:
1.Configuration of entities to tables
mapping
2.Generation of xml files with
mapping
3.Generation of Java classes
4.Project creation using existing DB
5.Database schema migration
Generated Entity
public abstract class _RegistrationInfo extends
CayenneDataObject {
public static final String EMAIL_PROPERTY = "email";
public static final String PASSWORD_PROPERTY =
"password";
public static final String VERSION_PROPERTY =
"version";
public static final String ID_PK_COLUMN = "id";
public void setEmail(String email) {
writeProperty("email", email);
}
public String getEmail() {
return (String)readProperty("email");
}
public void setPassword(String password) {
writeProperty("password", password);
}
public String getPassword() {
return (String)readProperty("password");
}
}
Data Context
Major methods of DataContext:
• public <T> T newObject(Class<T>
persistentClass)
• public void deleteObject(Object object)
• public java.util.List performQuery(Query
query)
• public void commitChanges()
• public void rollbackChanges()
Advanced
Features
• First level cache and query cache
• Remote Object Persistence support
• Lifecycle callbacks
• Lazy and eager loading
• Batch query support
• Advanced transaction management
Why Cayenne?
•Simple to learn and start
•Rapid Application Development
support
•Support of all popular RDBMS
•High quality and great
performance
•Cayenne do not spent much time
on app start
•More than 1 000 projects in
Thanks!
Question
s?

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Илья Драбеня - Apache Cayenne Intro

  • 2. What is Cayenne? • GUI tool for design entities and schema • Code First and Schema First mapping • Good integration with ant and maven • Great support of unit and integration testing • Support of multi-tenancy and SaaS • Support of Dependency Injection
  • 5. Five minutes tutorial Main class package org.example.cayenne; import org.apache.cayenne.ObjectContext; import org.apache.cayenne.access.DataContext; public class Main { public static void main(String[] args) { ObjectContext context = DataContext.createDataContext(); } }
  • 6. Five minutes tutorial Let’s create new entities Specify relationships Gallery metropolitan = context.newObject(Gallery.class); metropolitan.setName("Metropolitan Museum of Art"); Painting girl = context.newObject(Painting.class); girl.setName("Girl Reading at a Table"); picasso.addToPaintings(girl); picasso.addToPaintings(stein); girl.setGallery(metropolitan); stein.setGallery(metropolitan); And commit changes context.commitChanges();
  • 7. Five minutes tutorial Let’s query Picasso entity And delete it Expression qualifier = ExpressionFactory.matchExp(Artist.NAME_PROPERTY, "Pablo Picasso"); SelectQuery select = new SelectQuery(Artist.class, qualifier); Artist picasso = (Artist) DataObjectUtils.objectForQuery(context, select); if (picasso != null) { context.deleteObject(picasso); context.commitChanges(); }
  • 9. Cayenne Modeler Main features: 1.Configuration of entities to tables mapping 2.Generation of xml files with mapping 3.Generation of Java classes 4.Project creation using existing DB 5.Database schema migration
  • 10. Generated Entity public abstract class _RegistrationInfo extends CayenneDataObject { public static final String EMAIL_PROPERTY = "email"; public static final String PASSWORD_PROPERTY = "password"; public static final String VERSION_PROPERTY = "version"; public static final String ID_PK_COLUMN = "id"; public void setEmail(String email) { writeProperty("email", email); } public String getEmail() { return (String)readProperty("email"); } public void setPassword(String password) { writeProperty("password", password); } public String getPassword() { return (String)readProperty("password"); } }
  • 11. Data Context Major methods of DataContext: • public <T> T newObject(Class<T> persistentClass) • public void deleteObject(Object object) • public java.util.List performQuery(Query query) • public void commitChanges() • public void rollbackChanges()
  • 12. Advanced Features • First level cache and query cache • Remote Object Persistence support • Lifecycle callbacks • Lazy and eager loading • Batch query support • Advanced transaction management
  • 13. Why Cayenne? •Simple to learn and start •Rapid Application Development support •Support of all popular RDBMS •High quality and great performance •Cayenne do not spent much time on app start •More than 1 000 projects in