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JPA Doc
29

Temporal.value

Annotation Element javax.persistence.Temporal TemporalType value The type used in mapping java.util.Date or java.util.Calendar. Since: JPA 1.0
JDO Doc
29

Uniques.value

Annotation Element javax.jdo.annotations.Uniques Unique[] value The unique constraints. Returns: The unique constraints Since: JDO 2.1
Manual
19

Comparison in JPQL and Criteria API

, there is also a difference in the way that NULL values are handled by these operators. Comparing NULL values The following table shows how NULL values are handled by each comparison operator. One column presents comparison of NULL value with a non NULL value. The other column presents comparison of two NULL
Manual
17

Numbers in JPQL and Criteria Queries

Numeric values may appear in JPQL queries in many forms: as numeric literals - e.g. 123, -12.5. as parameters - when numeric values are assigned as arguments. as path expressions - in navigation ... - when the return value is numeric, e.g. INDEX, SIZE. as string functions - when the return value is numeric, e
Manual
16

GROUP BY and HAVING clauses

: The properties that are used for grouping (each group has unique value combination). Aggregate calculations ... of SQL: COUNT - returns a long value representing the number of elements. SUM - returns the sum of numeric values. AVG - returns the average of numeric values as a double value. MIN - returns the minimum
Manual
16

Index Definition

} @Unique represents a unique index that prevents duplicate values in the indexed field. A PersistenceException is thrown on commit (or flush) if different entities have the same value in a unique ... a value of one of the following persistable types: Primitive types: boolean, byte, short, char, int, long
Manual
15

JPA Persistable Types

, Date and Math types. Multi value types - Collections, Maps and Arrays. Miscellaneous types: Enum types ... persistable classes that function as value types. As with other non entity types, instances of an embeddable ... part is discarded when they are stored in the database. Multi Value Types The following multi value
Manual
15

JPA Primary Key

keys and automatic sequential value generation. This is a very powerful feature of ObjectDB ... and its primary key. Primary key values are unique per entity class. Instances of different entity classes, however, may share the same primary key value. Only entity objects have primary keys. Instances
Manual
15

Query Parameters in JPA

with different parameter values to retrieve different results. Running the same query multiple times with different parameter values (arguments) is more efficient than using a new query string for every query ... whose name field value is equal to :name, which is a parameter that serves as a placeholder
JDO Doc
15

javax.jdo.spi.StateManager

getBooleanField( PersistenceCapable pc, int field, boolean currentValue) Return the value for the field. Return the value for the field. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field Returns: the new value for the field