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18

key()

Method javax.persistence.criteria.MapJoin Path<K> key() Create a path expression that corresponds to the map key. Returns: path corresponding to map key Since: JPA 2.0
1

Key.embedded

Annotation Element javax.jdo.annotations.Key String embedded Whether this key is embedded. Returns: whether this key is embedded Default value: "" Since: JDO 2.1
1

Key.foreignKey

Annotation Element javax.jdo.annotations.Key String foreignKey Name for a generated foreign key constraint. Returns: the name of the generated foreign key constraint Default value: "" Since: JDO 2.1
1

Key.columns

Annotation Element javax.jdo.annotations.Key Column[] columns The column(s) for the key Returns: the column(s) for the key Default value: {} Since: JDO 2.1
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Key.column

Annotation Element javax.jdo.annotations.Key String column Name of the column to store the key in. Returns: name of the column to store the key in Default value: "" Since: JDO 2.1
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Key.dependent

Annotation Element javax.jdo.annotations.Key String dependent Whether the key is dependent on the owner (and will be deleted when the owner is deleted). Returns: whether the key is dependent on the owner Default value: "" Since: JDO 2.1
1

Key.generateForeignKey

Annotation Element javax.jdo.annotations.Key String generateForeignKey Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or "false". Returns: whether to generate or assume a foreign key constraint Default value: "" Since: JDO 2.1
1

Key.mappedBy

Annotation Element javax.jdo.annotations.Key String mappedBy Name of a member in the value class where this key is stored. Returns: the name of a member in the value class where this key is stored Default value: "" Since: JDO 2.1
1

newObjectIdInstance(pcClass, key)

Method javax.jdo.PersistenceManager Object newObjectIdInstance( Class pcClass, Object key ) This method returns an object id instance corresponding to the pcClass and key arguments. Parameters: pcClass - the Class of the persistence-capable instance key - for single-field identity, the parameter
1

Key.uniqueKey

Annotation Element javax.jdo.annotations.Key String uniqueKey The name of the unique key constraint to generate. Returns: the name of the unique key constraint Default value: "" Since: JDO 2.1

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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