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ObjectDB Object Database Features [2018-10-27]

elements are indexable (extremely fast JOIN queries). Map keys and values are indexable. Nested paths ... query FETCH JOIN. Configurable JDO fetch groups. Ease of Use and Learning ObjectDB is very simple ... (including INNER JOIN, LEFT OUTER JOIN and JOIN FETCH). WHERE (with both JPQL and JDOQL expressions
Result
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ObjectDB Object Database Features

(extremely fast JOIN queries). Map keys and values are indexable. Nested paths inside embedded objects ... Automatic pre-loading optimizations. Configurable JPA eager/lazy fetch and JPA query FETCH JOIN ... (first, max) - for paging. Query Structure SELECT (including NEW). FROM (including INNER JOIN, LEFT
JPA Doc
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javax.persistence.criteria.Fetch

javax.persistence.criteria Interface Fetch Superinterfaces: FetchParent Represents a join ... a fetch join to the specified attribute using an inner join. Create a fetch join to the specified attribute using an inner join. Parameters: attributeName - name of the attribute for the target
JPA Doc
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Criteria Query From Elements

(bound by an entity class) are represented by the Root subinterface: Join variables (bound by an attribute of a preceding variable in the FROM clause) are represented by the Join subinterface and its descendant interfaces: See the FROM in Criteria Queries section for more details and examples. Join
JPA Doc
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javax.persistence.criteria.FetchParent

, Join, ListJoin, MapJoin, PluralJoin, Root, SetJoin Represents an element of the from clause ... a fetch join to the specified attribute using an inner join. Create a fetch join to the specified attribute using an inner join. Parameters: attributeName - name of the attribute for the target
JPA Doc
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javax.persistence.criteria.Subquery

root Since: JPA 2.0 Join correlate( Join parentJoin) Create a subquery join object correlated to a join object of the enclosing query. Create a subquery join object correlated to a join object of the enclosing query. Parameters: parentJoin - join object of the containing query Returns
Manual
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Index Definition

above, the index order should be x first and y second. Indexes on collections are useful in JOIN queries: SELECT d FROM Document d JOIN d.words w WHERE w = 'JPA' The Document entity class contains a words ... for executing the following query: SELECT d FROM Document d JOIN d.words w WHERE LENGTH(w) >= 10
JPA Doc
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javax.persistence.JoinColumn

a column for joining an entity association or element collection. If the JoinColumn annotation itself is defaulted, a single join column is assumed and the default values apply. Example ... @JoinColumn(name="CUST_ID") // join column is in table for Order public Set
JPA Doc
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javax.persistence.MapKeyJoinColumn

) Specifies a mapping to an entity that is a map key. The map key join column is in the collection table, join table, or table of the target entity that is used to represent the map. If no MapKeyJoinColumn annotation is specified, a single join column is assumed and the default values apply. Example 1
FAQ
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What are the main benefits of using ObjectDB?

that ability and require multiple tables, multiple records and join operations in order to support