14 | Extra uninitialised entities spawned on merge() relationship Element owner - List<Element> ownedElements, and Example is a subclass entity ... Example e = new Example(root, "example"); root.addOwnedElement(e ... ) { return ownedElements.add(owned); } } @Entity static public class Example |
3 | javax.persistence.Column, the default values apply. Example 1: @Column(name="DESC", nullable=false, length=512) public String getDescription() { return description; } Example 2: @Column(name="DESC ... getDescription() { return description; } Example 3: @Column(name="ORDER_COST", updatable=false, precision |
3 | javax.persistence.OneToOne embedded field or property. Example 1: One-to-one association that maps a foreign key column ... ") public Customer getCustomer() { return customer; } Example 2: One-to-one association ... { @Id Integer id; ... } Example 3: One-to-one association from an embeddable class |
3 | javax.persistence.ManyToMany of the respective embedded field or property. Example 1: // In Customer class: @ManyToMany ... customers; } Example 2: // In Customer class: @ManyToMany(targetEntity=com.acme ... () { return customers; } Example 3: // In Customer class: @ManyToMany @JoinTable(name="CUST |
2 | javax.persistence.TableGenerator unit (across all generator types). Example 1: @Entity public class Employee ... ="empGen") int id; ... } Example 2: @Entity public class Address |
2 | javax.persistence.EmbeddedId supported. Example 1: @EmbeddedId protected EmployeePK empPK; Example 2: @Embeddable |
2 | javax.persistence.GeneratedValue primary keys. Example 1: @Id @GeneratedValue(strategy=SEQUENCE, generator="CUST_SEQ") @Column(name="CUST_ID") public Long getId() { return id; } Example 2: @Id |
2 | javax.persistence.Lob, and except for string and character-based types defaults to Blob. Example 1: @Lob @Basic(fetch=LAZY) @Column(name="REPORT") protected String report; Example 2: @Lob @Basic(fetch=LAZY) @Column(name="EMP |
2 | javax.persistence.NamedQuery annotation can be applied to an entity or mapped superclass. The following is an example of the definition ... " ) The following is an example of the use of a named query: @PersistenceContext public |
0 | javax.jdo.InstanceCallbacks over callbacks, for example to allow a class to implement the load callback without implementing any ... the runtime infrastructure of the application. For example, a persistent instance might notify |
