About join

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JPA Doc
8

joinList(attributeName, jt)

 jt ) Create a join to the specified List-valued attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0
JPA Doc
8

joinMap(attributeName, jt)

 jt ) Create a join to the specified Map-valued attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0
JPA Doc
8

joinSet(attributeName, jt)

Method javax.persistence.criteria.From SetJoin joinSet(   String attributeName,   JoinType jt ) Create a join to the specified Set-valued attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join
JDO Doc
8

javax.jdo.annotations.Value

a foreign key constraint exists on the column or columns associated with this join. Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or ... String serialized Whether the value is to be stored serialized (into a single column of a join table
JDO Doc
8

javax.jdo.annotations.Element

key constraint exists on the column or columns associated with this join. Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or ... serialized Whether the element is to be stored serialized (into a join table) Whether the element
Issue
8

combined index not used

: (v$1.linkedObjects join v$2). Step 5: Process ObjectProperty (v$3) instances ... .properties join v$3). [Step 5b] Evaluate fields in ObjectProperty (v$3) instances. [Step 5c ... is preferred and can improve performance). Complex heavy queries with several JOIN operations require
JPA Doc
7

correlate(parentCollection)

Method javax.persistence.criteria.Subquery CollectionJoin correlate(   CollectionJoin parentCollection ) Create a subquery collection join object correlated to a collection join object of the enclosing query. Parameters: parentCollection - join object of the containing query Returns: subquery join Since: JPA 2.0
JPA Doc
7

correlate(parentList)

Method javax.persistence.criteria.Subquery ListJoin correlate(   ListJoin parentList ) Create a subquery list join object correlated to a list join object of the enclosing query. Parameters: parentList - join object of the containing query Returns: subquery join Since: JPA 2.0
JPA Doc
7

correlate(parentMap)

Method javax.persistence.criteria.Subquery MapJoin correlate(   MapJoin parentMap ) Create a subquery map join object correlated to a map join object of the enclosing query. Parameters: parentMap - join object of the containing query Returns: subquery join Since: JPA 2.0
JPA Doc
7

correlate(parentSet)

Method javax.persistence.criteria.Subquery SetJoin correlate(   SetJoin parentSet ) Create a subquery set join object correlated to a set join object of the enclosing query. Parameters: parentSet - join object of the containing query Returns: subquery join Since: JPA 2.0