About JOIN

issue

Read only hint for query

Second thing after @FetchGroup I've found is read-only hint for EM. You can specify this hint to EM when executing query meaning that returned data will never be edited or persisted. My understanding of this is that each entity returned from query is in detached state as default state. query.setHint("odb.read-only", "true"); This could be useful in situation when you are sure, that you won't modify those entities - like listing entities, paging, logging, reporting. Feature Request Version: Priority: Normal Status: Active Replies: 0 Type:  Feature Request ...

 
api-jpa

JoinType.RIGHT

Right outer join.(Enum Constant of javax.persistence.criteria.JoinType)

 
forum_thread

Git seems not to commit objectdb.conf

git version 1.8.4.1 (Mac OS X) For some reason my Git seems to be "ignoring" (although not in .gitignore) the web/WEB-INF/objectdb.conf in a web app. I can't find anything about the .conf suffix being ignored. Has anybody noticed this and/or found a solution ? #1 2014-09-12 05:58 git version 1.8.4.1 (Mac OS X) For some reason my Git seems to be "ignoring" (although not in .gitignore) ...

 
api-jpa

getModel()

Return the metamodel representation for the collection attribute.(Method of javax.persistence.criteria.CollectionJoin)

 
api-jpa

JoinColumns.value

The join columns that map the relationship.(Annotation Element of javax.persistence.JoinColumns)

 
issue

Support Attribute Conversion for Persistence

The @Converter annotation and the Attribute Converter interface have two big benefits: 1) They make it possible to persist as-yet-unsupported java types (in the example below, Period - part of the 1.8 java.time package. (It could just have well shown conversion to and from SQL Timestamp objects.  2) They also make it possible to persist custom objects that are fundamental to your domain in an efficient manner.  JPA Feature Version: 2.1.0 Priority: High Status: Active Replies: 0 Type:  JPA Feature ...

 
api-jdo

Key.generateForeignKey

Generate or assume a foreign key constraint exists on the column or columns associated with this join.(Annotation Element of javax.jdo.annotations.Key)

 
api-jpa

PrimaryKeyJoinColumn.name

(Optional) The name of the primary key column of the current table.(Annotation Element of javax.persistence.PrimaryKeyJoinColumn)

 
api-jpa

MapKeyJoinColumn.referencedColumnName

(Optional) The name of the column referenced by this foreign key column.(Annotation Element of javax.persistence.MapKeyJoinColumn)

 
forum_thread

Waterfall tree algorithm for more optimized version of objectdb or

hello , i heard its very good and new datastructure known as waterfall tree compared to btree. It could be good if you think and research some datastructure or take a look at waterfalltree Or it can be selectable by objectdb :   here what i talk about :  http://stsdb.com/stsdb-w4.0/technology/waterfalltree/overview   the documentation tells , it makes db very fast here is algorithm on youtube :  #1 2014-02-07 12:56 hello , i heard its very good and new datastructure known as waterfall tree compared to btree. It could be go ...