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27

Query execution time issue

Entity e inner join e.person person inner join person.address address left join address.place addressPlace left join address.city addressCity left join address.county addressCounty left join person.birthPlace birthPlace left join person.birthCounty birthCounty left join person
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javax.persistence.CollectionTable

@CollectionTable(name="HOMES") // use default join column name @AttributeOverrides ... only applies if a single join column is used. The default is the same as for JoinColumn (i.e ... column.) However, if there is more than one join column, a JoinColumn annotation must be specified
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javax.persistence.InheritanceType

, Comparable<InheritanceType> Defines inheritance strategy options. Since: JPA 1.0 InheritanceType JOINED ... than the fields that are common to the parent class, and a join is performed to instantiate the subclass ... that are common to the parent class, and a join is performed to instantiate the subclass. Since: JPA 1
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getFetches()

Method javax.persistence.criteria.FetchParent Set<Fetch<X,?>> getFetches() Return the fetch joins that have been made from this type. Returns empty set if no fetch joins have been made from this type. Modifications to the set do not affect the query. Returns: fetch joins made from this type Since: JPA 2.0
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select(selection)

of the select item when it results from a get or join operation and the query result type is specified ... ) .join("items") . join("product")); Parameters
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CollectionTable.joinColumns

only applies if a single join column is used. The default is the same as for JoinColumn (i.e ... column.) However, if there is more than one join column, a JoinColumn annotation must be specified for each join column using the JoinColumns annotation. In this case, both the name
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getJoinType()

Method javax.persistence.criteria.Fetch JoinType getJoinType() Return the join type used in the fetch join. Returns: join type Since: JPA 2.0
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joinSet(attributeName)

Method javax.persistence.criteria.From SetJoin<X,Y> joinSet( String attributeName ) Create an inner join to the specified Set-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0
5

joinList(attributeName)

Method javax.persistence.criteria.From ListJoin<X,Y> joinList( String attributeName ) Create an inner join to the specified List-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0
5

joinMap(attributeName)

Method javax.persistence.criteria.From MapJoin<X,K,V> joinMap( String attributeName ) Create an inner join to the specified Map-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0

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.

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