ObjectDB ObjectDB

Internal Website Search

1-10 of 200 resultsRefresh
124

GROUP BY and HAVING clauses

The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual objects and fields. The position of a GROUP BY ... clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects
31

ObjectDB Object Database Features

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

groupBy(grouping)

Method javax.persistence.criteria.Subquery Subquery<T> groupBy( Expression... 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
30

groupBy(grouping)

Method javax.persistence.criteria.Subquery Subquery<T> groupBy( List<Expression<?>> 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
30

groupBy(grouping)

Method javax.persistence.criteria.AbstractQuery AbstractQuery<T> groupBy( Expression... grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously
30

groupBy(grouping)

<?>> grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously added grouping expressions are simply removed. Parameters: grouping - list of zero or
30

groupBy(grouping)

Method javax.persistence.criteria.Subquery<T> Subquery<T> groupBy( List<E> 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 grouping
30

groupBy(grouping)

Method javax.persistence.criteria.CriteriaQuery CriteriaQuery<T> groupBy( Expression... grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously
8

JDO Predefined ID Classes

An object ID is a combination of a persistence capable class and a primary key. It provides a unique representation of a persistent object. The following classes serve as predefined ID classes for persistence capable classes with a simple single field primary key: Object IDs are used in many
4

[ODB1] Chapter 4 - JDO Metadata

always uses datastore identity with its own object-id class). 4.3 Metadata for Fields Unlike ... ="transactional" /> <field name="f3" default-fetch-group="true" /> <field name="f4" default-fetch-group="false" /> <field name="f5" embedded="true" /> <field name="f6

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support