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Manual
18

Database Management Settings

specifies the maximum number of concurrent threads that can be served by the database engine ... are completed. The optimal number is usually larger than the number of available CPU cores, but not ... attribute specifies the speed of the index building background process as a number between 10 and 70
Manual
18

Paths and Types in JPQL and Criteria API

. But more often they are used in JPQL path expressions that navigate to values of simple types (number, boolean ... and functions (e.g. for strings and for numbers), they can be compared by all six comparison operators ... (number, boolean, string, date). For a path expression to be valid the user defined persistable class
JDO Doc
17

javax.jdo.spi.StateManager

- the field number currentValue - the current value of the field Returns: the new value for the field ... instance field - the field number currentValue - the current value of the field Returns: the new ... PersistenceCapable instance field - the field number currentValue - the current value of the field
Manual
15

JPA Persistable Types

their ordinal numbers. Caution is required when modifying an enum type that is already in use in ... numbers). Alternatively, enum values can be represented internally by their names. In that case, the names ... , values of the color1 and color2 fields are stored as ordinal numbers (i.e. 0, 1, 2) while values
Manual
15

Query Parameters in JPA

(?) followed by a positive int number. Besides the notation difference, named parameters and ordinal ... interface Parameter) rather than by names or numbers. See the Parameters in Criteria Queries section ... of which are overridden in TypedQuery. That large number of methods is not typical to JPA, which generally
Manual
12

Collections in JPQL and Criteria Queries

if the collection is empty and TRUE otherwise. SIZE The SIZE(collection) function returns the number of elements in a specified collection. For example: SIZE(c.languages) is evaluated to the number
Manual
12

Database Explorer

the entity class and specify the number of objects to construct. Click the Create and Persist button ... when working with classes with a large number of fields where displaying all the fields is problematic
Manual
12

JPA Entity Fields

maintains a version number for every entity object. The initial version of a new entity object (when stored ... is modified its version number is automatically increased by one. Version fields are used in conjunction
Manual
12

JPA Primary Key

64 bit number (long) that is set automatically by ObjectDB for every new entity object that is stored ... continuously and can be collected by accessing a minimum number of database pages. On the other end
Manual
12

ORDER BY clause (JPQL / Criteria API)

, any JPQL expression whose type is comparable (i.e. numbers, strings and date values) and is derived ... "))); Unlike other methods for setting criteria query clauses - the orderBy method takes a variable number