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Retrieving JPA Entity Objects

specifying FetchType.LAZY in either @OneToOne or @ManyToOne annotations (currently ObjectDB does not ... in @OneToMany or @ManyToMany annotations (currently ObjectDB does not distinguish between ... of the current fetch policy, as long as the EntityManager is open. This also includes fields that reference
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Locking in JPA

another EntityManager) since it was retrieved by the current updater. Optimistic locking ... another EntityManager instance) currently holds a PESSIMISTIC_WRITE lock on that database object. A PESSIMISTIC_WRITE lock request fails if another user currently holds either a PESSIMISTIC_WRITE lock or
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javax.persistence.TemporalType

java.sql.Time Map as java.sql.Time Since: JPA 1.0 TemporalType TIMESTAMP Map as java.sql.Timestamp Map as java.sql.Timestamp Since: JPA 1.0 TemporalType valueOf(String name) Returns the enum constant
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JPA / JDO Class Enhancer

.Enhancer If objectdb.jar is not in the current directory a path to it has to be specified. Alternatively ... technique is inferior to the other techniques that are described above. First, currently it only works
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Can I use ObjectDB with languages other than Java?

ObjectDB can be used by Java Virtual Machine (JVM) languages, such as Java, Groovy and Scala. It can also be used with other languages, such as Python, JavaScript, Ruby and PHP, but currently ... of ObjectDB for .NET is currently under development and future support for other languages
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javax.jdo.spi.StateManager

- the field number currentValue - the current value of the field Returns: the new value for the field ... instance field - the field number currentValue - the current value of the field Returns: the new ... PersistenceCapable instance field - the field number currentValue - the current value of the field
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javax.jdo.JDOEntityManager

if the instance is a managed entity instance belonging to the current persistence context. Check if the instance is a managed entity instance belonging to the current persistence context. Parameters: entity ... is already deleted in the current transaction. This method throws JDOUserException if the instance is transient
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[ODB1] Chapter 6 - Persistent Objects

object of the current transaction, and not yet stored in the database. JDOHelper.isDeleted(obj) Returns ... the current transaction using deletePersistent(...) and it is expected to be deleted at transaction ... the current transaction. Particularly, it returns true if isNew(obj) or isDeleted(obj) return true
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[ODB1] Chapter 9 - ObjectDB Explorer

of that object. Select an object in a currently open table or browser viewer to explore it in a new ... " command switches the current viewer to focus on the selected object. A double click on the target element ... file to a new location, applying all the changes of the current transaction only to the new database
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javax.jdo.PersistenceManager

has no effect if the instance is already deleted in the current transaction. This method throws ... and manipulation outside of a JDO environment. When detaching instances, only fields in the current FetchPlan ... must either be in the default-fetch-group, or in the current custom FetchPlan. Parameters: pcs

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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