About value
Auto Generated Values
Explains the different strategies for generating auto values (mainly for primary key fields) in JPA.... Reference Page... annotation specifies that a value will be automatically generated for that field. This is primarily ... numeric persistent fields as well. Several different value generation strategies can be used as explained below. This ...
javax.jdo.spi.StateManager
This interface is the point of contact between managed instances of PersistenceCapable classes and the JDO implementation.(Interface of JDO)
javax.persistence.TypedQuery
Interface used to control the execution of typed queries.(Interface of JPA)
javax.persistence.criteria.CriteriaBuilder
Used to construct criteria queries, compound selections, expressions, predicates, orderings.(Interface of JPA)
javax.jdo.annotations.Persistent
Annotation for defining the persistence of a member.(Annotation of JDO)
literal(value)
Create an expression for a literal.(Method of javax.persistence.criteria.CriteriaBuilder)
Comparison in JPQL and Criteria API
Explains how comparison operators can be used in JPQL queries, including in comparing null values.... operator. One column presents comparison of NULL value with a non NULL value. The other column presents comparison of two NULL values: ...
JPA Annotations for Value Generation
Reference (JavaDoc) of JPA 2 value generation annotations, including @GeneratedValue, @SequenceGenerator and @TableGenerator.... The @GeneratedValue annotation can also reference a value generator, which is defined at the class level by using one of the ... More details about automatic value generation are provided at the Generated Value section of the ObjectDB Manual. ...
