Fast Object Database for Java - with JPA/JDO support

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JPA Metamodel API

on the primary key and the version attributes and the super type. For example: // Get the super type
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javax.persistence.SecondaryTable

. If no primary key join columns are specified, the join columns are assumed to reference the primary key columns of the primary table, and have the same names and types as the referenced primary key columns of the primary table. Example 1: Single secondary table with a single primary key column. @Entity
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javax.persistence.JoinColumn

field of the referencing entity or embeddable class; "_"; the name of the referenced primary key column ... : the name of the entity; "_"; the name of the referenced primary key column. Default value: "" Since: JPA ... the collection. Default (only applies if single join column is being used): The same name as the primary key
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Database Management Settings

Explains settings and performance tuning of the ObjectDB Java object database for JPA/JDO.
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javax.persistence.GeneratedValue

) Provides for the specification of generation strategies for the values of primary keys. The GeneratedValue annotation may be applied to a primary key property or field of an entity or mapped superclass in ... to be supported for simple primary keys. Use of the GeneratedValue annotation is not supported for derived
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javax.persistence.MapKey

the map key for associations of type java.util.Map when the map key is itself the primary key or ... other than the primary key is used as a map key then it is expected to have a uniqueness constraint ... ="department") @MapKey // map key is primary key public Map getEmployees
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javax.persistence.MapsId

a ManyToOne or OneToOne relationship attribute that provides the mapping for an EmbeddedId primary key, an attribute within an EmbeddedId primary key, or a simple primary key of the parent entity ... corresponds. If the entity's primary key is of the same Java type as the primary key of the entity
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javax.jdo.annotations.Join

: "" Since: JDO 2.1 String generatePrimaryKey Generate or assume a primary key constraint exists on the column or columns associated with this join. Generate or assume a primary key constraint exists on the column ... assume a primary key constraint Default value: "" Since: JDO 2.1 String index The name of the index
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javax.persistence.TableGenerator

get methods) Defines a primary key generator that may be referenced by name when a generator element ... on the primary key field or property. The scope of the generator name is global to the persistence ... of the primary key column in the table. (Optional) Name of the primary key column in the table
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javax.persistence.MapKeyJoinColumn

. Default (only applies if single join column is being used.) The same name as the primary key column ... ) Specifies a mapping to an entity that is a map key. The map key join column is in the collection table ... ) The name of the foreign key column for the map key. (Optional) The name of the foreign key column

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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