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10

Literals in JPQL and Criteria Queries

); // String literals: Expression<String> empty = cb.literal(""); Expression<String> jpa = cb
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ObjectDB Object Database Features

& functions (LIKE, CONCAT, TRIM, SUBSTRING, ...). JPQL collection operators & functions (IS EMPTY, MEMBER
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General Settings and Logging

is empty ("") logging to file is disabled. Every day a new log file is generated with the name odb
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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 Returns: is-empty predicate Since: JPA 2.0 Predicate isFalse( Expression<Boolean> x) Create
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javax.persistence.metamodel.ManagedType

the attributes declared by the managed type. Returns empty set if the managed type has no declared ... the managed type. Returns empty set if the managed type has no declared multi-valued attributes ... by the managed type. Return the single-valued attributes declared by the managed type. Returns empty
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javax.persistence.metamodel.EntityType

the managed type. Returns empty set if the managed type has no declared attributes. Returns ... ) declared by the managed type. Returns empty set if the managed type has no declared multi-valued attributes ... . Returns empty set if the managed type has no declared single-valued attributes. Returns: declared single
1

[ODB1] Chapter 3 - Persistent Classes

interface with all the four methods, keeping the methods that are irrelevant empty. For example
1

[ODB1] Chapter 7 - JDOQL Queries

can even be constructed by an empty newQuery() form: Query newQuery(); However, a candidate collection
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[ODB1] Chapter 5 - JDO Connections

, empty database at that location. This behavior is an ObjectDB extension. JDO does not define a standard
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[ODB1] Chapter 4 - JDO Metadata

field, empty collection, 0 size array, and so on). primary-key The primary-key attribute, defined in

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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