Fast Object Database for Java - with JPA/JDO support

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Comparison in JPQL and Criteria API

) expressions: c.president == null c.president != null Comparable Data Types Comparison is supported for values of the following data types: Values of numeric types, including primitive types (byte, short, char, int, long, float, double), wrapper types (Byte, Short, Character, Integer, Long, Float, Double
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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 ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast ... expression object. This method does not cause type conversion: the runtime type is not changed. Warning
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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 ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast ... expression object. This method does not cause type conversion: the runtime type is not changed. Warning
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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 ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast upon the expression ... expression object. This method does not cause type conversion: the runtime type is not changed. Warning
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javax.persistence.criteria.CollectionJoin

> The CollectionJoin interface is the type of the result of joining to a collection ... . Parameters: name - alias Returns: selection item Since: JPA 2.0 Expression as(Class type) Perform ... upon the expression, returning a new expression object. This method does not cause type conversion: the runtime type
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Query Parameters in JPA

are defined implicitly by appearing in the query string. The parameter type is inferred by the context. In the above example, a comparison of :name to a field whose type is String indicates that the type ... other query elements) are represented by objects (of type ParameterExpression or its super interface
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JPA Primary Key

the database is uniquely identified (and can be retrieved from the database) by the combination of its type ... of other persistable types are always stored as part of their containing entity objects and do not ... : } A primary key field that is set by the application can have one of the following types: Primitive types
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javax.persistence.criteria.Join

, PluralJoin, SetJoin A join to an entity, embeddable, or basic type. Since: JPA 2.0 Learn how to use ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast upon the expression ... expression object. This method does not cause type conversion: the runtime type is not changed. Warning
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javax.persistence.criteria.PluralJoin

to all collection types. It is not intended to be used directly in query construction. Since: JPA 2.0 ... . Parameters: name - alias Returns: selection item Since: JPA 2.0 Expression as(Class type ... upon the expression, returning a new expression object. This method does not cause type conversion
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javax.persistence.criteria.From

, PluralJoin, Root, SetJoin Represents a bound type, usually an entity that appears in the from clause ... of associations, embeddables, and collections belonging to the type, and for Paths of attributes belonging to the type. Since: JPA 2.0 Selection alias(String name) Assigns an alias to the selection

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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