About Group Id

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JPA Doc
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groupBy(grouping)

Method javax.persistence.criteria.Subquery Subquery groupBy(   List grouping ) Specify the expressions that are used to form groups over the subquery results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously added
Result
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ObjectDB Object Database Features [2018-01-27]

attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented ... query FETCH JOIN. Configurable JDO fetch groups. Ease of Use and Learning ObjectDB is very simple ... . Persistence is set using JPA/JDO annotations (e.g. @Entity, @Id, @Index). Transparent activation
Result
30

ObjectDB Object Database Features [2018-10-27]

attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented ... query FETCH JOIN. Configurable JDO fetch groups. Ease of Use and Learning ObjectDB is very simple ... . Persistence is set using JPA/JDO annotations (e.g. @Entity, @Id, @Index). Transparent activation
Result
30

ObjectDB Object Database Features

attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented ... . Configurable JDO fetch groups. Ease of Use and Learning ObjectDB is very simple to use and is easier ... /JDO annotations (e.g. @Entity, @Id, @Index). Transparent activation (no activation depth) - objects
JDO Doc
29

setGrouping(group)

Method javax.jdo.Query void setGrouping(   String group ) Set the grouping expressions, optionally including a "having" clause. When grouping is specified, each result expression must either be an expression contained in the grouping, or an aggregate evaluated once per group. Parameters: group
JDO Doc
28

addFetchGroups(groups)

Method javax.jdo.PersistenceManagerFactory void addFetchGroups(   FetchGroup... groups ) Add the FetchGroups to the set of active fetch groups. FetchGroups are made unmodifiable before being added ... : groups - an array of FetchGroups Throws: SecurityException - if the caller is not authorized for JDOPermission ("manageMetadata") Since: JDO 2.2
JDO Doc
28

removeFetchGroups(groups)

Method javax.jdo.PersistenceManagerFactory void removeFetchGroups(   FetchGroup... groups ) Remove the FetchGroups from the set of active FetchGroups. Existing FetchGroups that match parameter ... . Parameters: groups - an array of FetchGroups Throws: SecurityException - if the caller is not
Manual
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JPA Entity Fields

superclasses) can be classified into the following five groups: Transient fields Persistent fields Inverse (Mapped By) fields Primary key (ID) fields Version field The first three groups (transient, persistent ... two groups (primary key and version fields) can only be used in entity classes. Primary key fields
Manual
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Auto Generated Values

. To minimize round trips to the database server, IDs are allocated in groups. The number of IDs in each ... number generator for every database. This number generator is used to generate automatic object IDs ... @GeneratedValue with the AUTO strategy: @Entity public class EntityWithAutoId1 { @Id @GeneratedValue
JPA Doc
25

javax.persistence.Id

javax.persistence Annotation Id Target: Fields (including property get methods) Specifies the primary key of an entity. The field or property to which the Id annotation is applied ... : @Id public Long getId() { return id; } Since: JPA 1.0 See Also: Column GeneratedValue Learn