18 | @OneToMany(fetch = FetchType.LAZY) list is always null Parent { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "b") private int id; @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL) private List<Child> children; public int getId() { return id; } public void setId(int id |
17 | Should derived fields of an EmbeddedId be manually maintained by app code? .... public void setSingleton(EContainer singleton) { this.id.cont = singleton.id; this.container ... .... public void setParent(ECompoundKeyMapItem parent) { this.id.prnt = parent.id; this.parent ... javax.persistence.Id; import javax.persistence.NamedQueries; import javax.persistence.NamedQuery |
17 | Optimistic locking: prevent version increment on entity collection attribute @Entity public class Document { // ID is generated by the database @Id private long id ... <Reading>(); public long getId() { return id; } public ArrayList<Reading ... ) { this.readings.add(reading); } } @Entity public class Reading { // ID |
3 | javax.persistence.MapKey() {... } ... } @Entity public class Employee { ... @Id Integer getEmpId() { ... } @ManyToOne @JoinColumn(name="dept_id") public Department ... { @Id public Integer getEmpId() { ... } ... @ManyToOne @JoinColumn(name |
3 | javax.persistence.ManyToMany_PHONE", joinColumns= @JoinColumn(name="CUST_ID", referencedColumnName="ID"), inverseJoinColumns= @JoinColumn(name="PHONE_ID", referencedColumnName="ID |
3 | getIdClassAttributes()Method javax.persistence.metamodel.IdentifiableType Set<SingularAttribute<?,?>> getIdClassAttributes() Return the attributes corresponding to the id class of the identifiable type. Returns: id attributes Throws: IllegalArgumentException - if the identifiable type does not have an id class Since: JPA 2.0 |
3 | javax.persistence.OneToMany getOrders() { return orders; } In Order class: @ManyToOne @JoinColumn(name="CUST_ID ... ; } // In Order class: @ManyToOne @JoinColumn(name="CUST_ID", nullable=false ... ) @JoinColumn(name="CUST_ID") // join column is in table for Order public Set getOrders |
0 | javax.jdo.Constants_SERVER_TIME_ZONE_ID The name of the persistence manager factory element's "server-time-zone-id" attribute. The name of the persistence manager factory element's "server-time-zone-id" attribute ... " Since: JDO 2.1 See Also: PersistenceManagerFactory.getRetainValues() String PROPERTY_SERVER_TIME_ZONE_ID |
0 | javax.jdo.identity.IntIdentity Since: JDO 2.2 boolean equals(Object obj) Determine if the other object represents the same object id. Determine if the other object represents the same object id. Parameters: obj - the other object Returns: true if both objects represent the same object id Since: JDO 1.0 boolean equals(Object obj |
0 | javax.jdo.JDONullIdentityException An instance of this class is thrown when attempting to create an object id when the object id constructor parameter is null. This might occur when creating an object id instance from a transient instance |
