13 | Find the error...JPA ENTITY HIBERNATE.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax ... { private static final long serialVersionUID = 1L; // @GeneratedValue @Id @Column(name = "id") @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; @Column(name = "username") private |
13 | Database size is much larger than expected (x2)I store images into objectdb. The schema is : <URI>::=(<sUrl>, <cMark>, <iSize>, <baBody>, <id>) <sUrl>::=String <cMark>::=char <iSize>::=int <baBody>::=byte[] <id>::=@ID So simple a class will fail after 155,648 insertions with -Xmx1432m, ... NO = 151552 @ 8042217472 id = 0 @ 7703244276 |
2 | javax.persistence.PrimaryKeyJoinColumns") @PrimaryKeyJoinColumns({ @PrimaryKeyJoinColumn(name="CUST_ID", referencedColumnName="ID"), @PrimaryKeyJoinColumn(name="CUST_TYPE", referencedColumnName |
2 | getIdType()Method javax.persistence.metamodel.IdentifiableType Type<?> getIdType() Return the type that represents the type of the id. Returns: type of id Since: JPA 2.0 |
2 | javax.persistence.JoinColumn @JoinColumn(name="ADDR_ID") public Address getAddress() { return address; } Example ... @JoinColumn(name="CUST_ID") // join column is in table for Order public Set |
2 | javax.persistence.SecondaryTable=@PrimaryKeyJoinColumn(name="CUST_ID")) public class Customer { ... } Example 2: Single secondary table ... ="CUST_DETAIL", pkJoinColumns={ @PrimaryKeyJoinColumn(name="CUST_ID |
2 | javax.persistence.MapKeyColumn relationship field or property; "_"; "KEY". Example: @Entity public class Item { @Id int id |
2 | javax.persistence.SecondaryTables_DETAIL", pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPL_ID")), @SecondaryTable(name="EMP_HIST", pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPLOYEE_ID")) }) public class |
0 | equals(obj)Method javax.jdo.identity.LongIdentity boolean equals( Object obj ) 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 |
0 | getServerTimeZoneID()Method javax.jdo.PersistenceManagerFactory String getServerTimeZoneID() Gets the TimeZone ID of the server associated with this PersistenceManagerFactory. If not set, assume that the server has the same TimeZone ID as the client. Returns: the TimeZone of the server Since: JDO 2.1 See Also: setServerTimeZoneID(String) |
