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Hi, I have an object I am trying to persist (java) - It has several fields of type long [][]. It is taking very long to persist and sometimes never finish - it hangs on getTransaction().commit ... ; private static final long serialVersionUID = 1L;     public @Id String id;   

key cannot be modified. It represents the entity object as long as it exists in the database. As ... is a sequential 64 bit number ( long ) that is set automatically by ObjectDB for every new entity object ... a primary key field: @Entity public class Project { @Id @GeneratedValue long id; // still set

Hi, I need to change field type in our model from long to String. After changing filed type in our model and repairing database with doctor, most of our entities is gone. Doctor puts some errors ... documentation? lwalkowski Lukasz Walkowski Changing a field from long to String should not require any

;   long t0 = System.currentTimeMillis();         projects ... ; private Long id;     ..     ..    

such long wait times? CAPdev CAP Dev There are no known issues that may be related. How do you know

EntityManager.refresh takes a long time for entity object Person in this code:     logger.log(Level.INFO, "begin select for person " + new Date().toString());                TypedQuery personQuery =  

: Could you explain the long time for first persist? btc_es BTC EmbeddedSystems Some operations

Hi! I have seen a strange behavior of ObjectDB Explorer: it shows @Id as being Long , not Integer as it's normally declared in the java class. This happens now with all entities in all 3 databases used for one project. If I open one of the entities in the explorer, then I click on it's id (in

( strategy = GenerationType . AUTO ) long id; : } AUTO is the default strategy, so the following definition is equivalent: @Entity public class EntityWithAutoId2 { @Id @GeneratedValue long id ... = GenerationType . IDENTITY ) long id; : } The IDENTITY strategy also generates an automatic value

, which is a Long object reflecting the number of Country objects in the database: TypedQuery query = em. createQuery ( "SELECT COUNT(c) FROM Country c", Long .class); long countryCount = query. getSingleResult ... and the code is simple: Query query = em. createQuery ("SELECT COUNT(c) FROM Country c"); long countryCount

type to any numeric type. In this context numeric types are: byte , short , char , int , long , float , double , Byte , Short , Character , Integer , Long , Float , Double , BigInteger , BigDecimal ... collection or array type, as long as the elements are convertible (e.g. from int[] to ArrayList

: SingularAttribute id1 = entityType. getId ( Long .class); // Gets a single ID attribute - excluding inherited: SingularAttribute id2 =   entityType. getDeclaredId ( Long .class); // Checks ... the version attribute - excluding inherited: SingularAttribute v1 = entityType. getVersion ( Long .class

and primary key: em. find (MyEntity2.class, Long .valueOf(1),      Collections ... operation. For example: em. find (MyEntity2.class, Long .valueOf(1),    Collections. singletonMap ... = cache. contains (MyEntity.class, Long .valueOf(id)); Cached entity objects can be removed from the cache

System Types (for persistent fields) Primitive types (boolean, byte, short, char, int, long , float, double). Wrapper types (Boolean, Byte, Short, Character, Integer, Long , Float, Double). java.lang ... . Primary Key Data Types Primitives (boolean, byte, short, char, int, long , float and double). Wrappers

, byte , short , char , int , long , float and double . Equivalent wrapper classes from package java.lang: Boolean , Byte , Short , Character , Integer , Long , Float and Double . java.math.BigInteger ... and map types are supported, as long as their values (i.e. elements in collections and arrays and keys

is used as with binary arithmetic operations in Java (e.g. for int and long operands the MOD function returns a long value). The SQRT Function The SQRT function returns the square root ... demonstrate only integer expressions, but all the numeric types ( byte , short , int , long , float

of SQL: COUNT - returns a long value representing the number of elements. SUM - returns the sum ... that letter's group as a Long object and the third cell contains the distinct number of currencies ... aggregate expressions: count , countDistinct - return a long type expression representing the number

a generic java.lang.Object , as long as the type of the actual value at runtime is persistable (or null ... public class EntityWithVersionField { @Version long version; } If a version field exists, ObjectDB

: Primitive types: boolean , byte , short , char , int , long , float , double. Equivalent wrapper classes from package java.lang: Byte , Short , Character , Integer , Long , Float , Double. java.math

, including primitive types ( byte , short , char , int , long , float , double ), wrapper types ( Byte , Short , Character , Integer , Long , Float , Double ),  BigInteger and BigDecimal can be compared

. As long as the relevant data in the database is unchanged cached results can be returned instead

long path expression (which is not an option for a collection). For example: SELECT c, c.capital.name

fields of an entity object can be accessed freely, regardless of the current fetch policy, as long as

. Retention of Your Personal Data The Company will retain Your Personal Data only for as long as

) are also supported. Following are examples of valid numeric literals in JPQL: int : 100, -127, 0, 07777 long

connections from any machine as long as a valid username and password are provided

too). @Entity public class Product implements Serializable { @Id @GeneratedValue private long id ... Category implements Serializable { @Id private long id; public Category(int id) { this.id = id ... implements Serializable { @Id //@GeneratedValue private long id; @ManyToMany(cascade=CascadeType.PERSIST

Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue private long id ... Long getId() { return id; } public int getX() { return x; } public int getY() { return y; } @Override

static final long serialVersionUID = 1L; @Id @GeneratedValue private long id; private int x; private int y; public Point() { } Point(int x, int y) { this.x = x; this.y = y; } public Long getId

key of type Long , Integer, long , or int , the provider selects between TABLE , SEQUENCE ... identity column. May be used to generate primary keys of type Long , Integer, long , or int ... using a database sequence. May be used to generate primary keys of type Long , Integer, long , or int

static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private

final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private String

{ private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id

final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private String

static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private

implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private String name; private Date signingDate; // Constructors: public

GuestServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Override

GuestServlet extends HttpServlet { private static final long serialVersionUID = 1L; // Injected DAO EJB

long serialVersionUID = 1L; // Injected DAO EJB: @EJB GuestDao guestDao; @Override protected void

final long serialVersionUID = 1L; @Override protected void doGet( HttpServletRequest request

must be of one of the following basic types: int , Integer, short , Short, long , Long , java.sql.Timestamp

JPA Enum Constant in jakarta.persistence.GenerationType TABLE Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness. May be used to generate primary keys of type Long , Integer, long , or int . Since: JPA 1.0

JPA Enum Constant in jakarta.persistence.GenerationType AUTO Indicates that the persistence provider should pick an appropriate strategy for the particular database. For a primary key of type java.util.UUID or String, this is equivalent to UUID . For a primary key of type Long , Integer, long , or

JPA Enum Constant in jakarta.persistence.GenerationType IDENTITY Indicates that the persistence provider must assign primary keys for the entity using a database identity column. May be used to generate primary keys of type Long , Integer, long , or int . Since: JPA 1.0

JPA Enum Constant in jakarta.persistence.GenerationType SEQUENCE Indicates that the persistence provider must assign primary keys for the entity using a database sequence. May be used to generate primary keys of type Long , Integer, long , or int . Since: JPA 1.0

, and LockModeType.PESSIMISTIC_FORCE_INCREMENT are used to immediately obtain long -term database locks

expressions to String, and String expressions to Integer, Long , Float, and Double. Support

, modifications to its persistent fields and properties are automatically detected, as long as

an aggregate expression applying the sum operation to an Integer-valued expression, returning a Long result

to Integer, Long , Float, and Double. Support for typecasts between other basic types is not required