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15

Running JPA Queries

is unnecessary and the warning is avoided. The query result collection functions as any other ordinary Java collection. For example, a result collection of a parameterized type can be iterated easily using ... has to be extracted from the result collection after query execution (e.g. by results.get(0)). To eliminate
15

ObjectDB Object Database Features

). Many other internal caches. Indexing Single field and multi field (composite) indices. Collection ... and java.lang.BigDecimal. Collection types: Collection, List, Set, ArrayList, Vector, Stack ... & functions (LIKE, CONCAT, TRIM, SUBSTRING, ...). JPQL collection operators & functions (IS EMPTY, MEMBER
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javax.persistence.criteria.CriteriaBuilder

Predicate isEmpty( Expression<C> collection) Create a predicate that tests whether a collection is empty. Create a predicate that tests whether a collection is empty. Parameters: collection - expression ... - expression to be tested Returns: predicate Since: JPA 2.0 Predicate isMember(E elem, Expression<C> collection
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javax.persistence.criteria.CollectionJoin

>, FetchParent<Z,E>, From<Z,E>, Join<Z,E>, Path<E>, PluralJoin<Z,Collection<E>,E>, Selection<E>, TupleElement<E> The CollectionJoin interface is the type of the result of joining to a collection over an association or element collection that has been specified as a java.util.Collection. Since: JPA 2.0 Selection
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javax.persistence.criteria.ListJoin

interface is the type of the result of joining to a collection over an association or element collection that has been specified as a java.util.List. Since: JPA 2.0 Selection<X> alias(String name ... ) Create a fetch join to the specified collection-valued attribute using an inner join. Create a fetch
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javax.persistence.criteria.SetJoin

interface is the type of the result of joining to a collection over an association or element collection that has been specified as a java.util.Set. Since: JPA 2.0 Selection<X> alias(String name ... a fetch join to the specified collection-valued attribute using an inner join. Create a fetch join
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javax.persistence.criteria.MapJoin

> The MapJoin interface is the type of the result of joining to a collection over an association or element collection that has been specified as a java.util.Map. Since: JPA 2.0 Selection<X> alias(String name ... > attribute) Create a fetch join to the specified collection-valued attribute using an inner join. Create
13

WHERE clause (JPQL / Criteria API)

objects to the SELECT clause for collecting as query results, the WHERE clause gets an opportunity ... evaluates to TRUE are passed to the SELECT clause and then collected as query results. WHERE Predicate ... ) and functions (numeric functions, string functions, collection functions). The WHERE predicate
13

Database Schema Evolution

any date type to any date type. From any collection or array type to any collection or array type, as ... collection or array that can contain that object as en element. From any map type to any map type as
1

javax.jdo.Query

. There are three required elements in a Query: the class of the results, the candidate collection ... candidateCollectionExpression - the candidate collection of the subquery as an expression using ... to be used in this Query candidateCollectionExpression - the candidate collection to apply to the subquery

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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