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16

General Performance Issues Illustrated with a Specific Method

="Overrides"> @Override public int hashCode() { int hash = 0; hash += (id ... ageCalculated = false; @Transient private int ageMonths; @Transient private int ageDays; @Transient private int ageYears; @Transient private String age; @Transient
15

Trouble bug on explorer

(strategy=GenerationType.SEQUENCE, generator="seq") private int gid; @Index private int ... ; private String mail; private int access; private int programType; private ... lastIp; private int flags; private int perUser; private boolean online
15

Error 613 - i cant put a list<Athlete> into a Squad object

a squad it brings up an exception. so the problematic line would u find int the main class line number 19 ... ; import javax.persistence.OneToMany; @Entity public class Squad {     private int squadId ... ();         // TODO Auto-generated constructor stub     }     public Squad(int squadId) {         super
15

Persist error @ManyToMany how to define correct entities relationships

private long id; public Category(int id) { this.id = id ... <Category> categories = new ArrayList(); public Product(int id,Category cat ... ; public Category(int id) { this.id = id; } public
3

javax.persistence.OneToOne

to another entity. @Entity public class Employee { @Id int id; @Embedded LocationDetails location; ... } @Embeddable public class LocationDetails { int ... ParkingSpot { @Id int id; String garage; @OneToOne(mappedBy="location.parkingSpot
3

printStackTrace()

[] args) { crunch(null); } static void crunch(int[] a) { mash(a); } static void mash(int[] b) { System.out.println(b[0]); } } The backtrace
0

javax.jdo.identity.LongIdentity

and key. Parameters: pcClass - the class str - the key Since: JDO 1.0 int compareTo(T arg0) Parameters: arg0 - int compareTo(Object o) Determine the ordering of identity objects. Determine the ordering ... . Since: JDO 2.0 int hashCode() Return the cached hash code. Return the cached hash code. Returns
0

javax.jdo.identity.CharIdentity

- the target class key - the key Since: JDO 1.0 int compareTo(T arg0) Parameters: arg0 - int compareTo ... the target class name. Return the target class name. Returns: the target class name. Since: JDO 2.0 int
0

printStackTrace()

[] args) { crunch(null); } static void crunch(int[] a) { mash(a); } static void mash(int[] b) { System.out.println(b[0]); } } The backtrace
0

printStackTrace()

[] args) { crunch(null); } static void crunch(int[] a) { mash(a); } static void mash(int[] b) { System.out.println(b[0]); } } The backtrace

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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