About primary key

81-90 of 200Refresh
JPA Doc
12

javax.persistence.MapKeyJoinColumn

. Default (only applies if single join column is being used.) The same name as the primary key column ... ) Specifies a mapping to an entity that is a map key. The map key join column is in the collection table ... (Optional) The name of the foreign key column for the map key. (Optional) The name of the foreign key
JPA Doc
12

javax.persistence.GeneratedValue

) Provides for the specification of generation strategies for the values of primary keys. The GeneratedValue annotation may be applied to a primary key property or field of an entity or mapped superclass in ... to be supported for simple primary keys. Use of the GeneratedValue annotation is not supported for derived
JPA Doc
12

javax.persistence.MapKey

the map key for associations of type java.util.Map when the map key is itself the primary key or ... other than the primary key is used as a map key then it is expected to have a uniqueness constraint ... ="department") @MapKey // map key is primary key public Map getEmployees
JPA Doc
11

javax.persistence.MapsId

a ManyToOne or OneToOne relationship attribute that provides the mapping for an EmbeddedId primary key, an attribute within an EmbeddedId primary key, or a simple primary key of the parent entity ... corresponds. If the entity's primary key is of the same Java type as the primary key of the entity
Forum
11

Getting Foreign Key

level primary key but i also nead to get foreign key which is belongs to header. WriteObjectQuery ... got pojo name query.getPrimaryKey() by using this i can get primary key now i nead to get foreighn ... How to get Foreign key using  org.eclipse.persistence.queries.WriteObjectQuery class
JDO Doc
11

javax.jdo.annotations.Join

: "" Since: JDO 2.1 String generatePrimaryKey Generate or assume a primary key constraint exists on the column or columns associated with this join. Generate or assume a primary key constraint exists on the column ... assume a primary key constraint Default value: "" Since: JDO 2.1 String index The name of the index
JDO Doc
11

javax.jdo.PersistenceManager

(primary key) JDO identity. If it is used for instances of classes using datastore identity ... javax.jdo Interface PersistenceManager PersistenceManager is the primary interface for JDO-aware ... 1.0 T getObjectById(Class cls, Object key) Looks up the instance of the given type
JPA Doc
11

javax.persistence.TableGenerator

get methods) Defines a primary key generator that may be referenced by name when a generator element ... on the primary key field or property. The scope of the generator name is global to the persistence ... of the primary key column in the table. (Optional) Name of the primary key column in the table
JDO Doc
11

javax.jdo.spi.PersistenceCapable

identity, this method must be called on an instance of a persistence-capable class with its primary key ... is initialized with the value(s) of the primary key field(s) of the instance on which the method is called ... with the values of the primary key fields of the persistence-capable instance on which the method
Forum
10

Can a Set<E> be a foreign key?

I have two classes, Cell and Character.  Basically, the cell is like a room, and contains a variable (private Set cellHeldCharacters;) which holds the IDs of the characters within the cell (The IDs are Primary Keys).  Can I use the Foreign Key annotation for the variable, or is it illegal