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113

Retrieve latest entry in a time-series

Retrieve latest entry in a time-series
113

Retrieving Metamodel without connection

Retrieving Metamodel without connection
22

Retrieving Metamodel without Connection

Retrieving Metamodel without Connection
22

Enable intern() for Retrieved Strings

Enable intern() for Retrieved Strings
21

JPA Persistable Types

and do not require separate space allocation and separate store and retrieval operations ... and retrieval are faster). It simplifies queries on dates and ranges of dates. When an entity is stored ... is retrieved from the database. For example, the Arrays.asList method returns an instance of an internal Java
21

Locking in JPA

another EntityManager) since it was retrieved by the current updater. Optimistic locking ... ); In addition, the hint can be set for a specific retrieval operation or query. Releasing ... PESSIMISTIC_WRITE with OPTIMISTIC_FORCE_INCREMENT). Locking during Retrieval JPA 2 provides various methods
18

JPA Metamodel API

The JPA Metamodel API provides the ability to examine the persistent object model and retrieve ... to retrieve sets of types: // Get all the managed classes: // (entity classes, embeddable classes ... are already stored in the database. Three additional methods can be used to retrieve a specific type by its Class
16

JPA Entity Fields

the database, but is still available after retrieval by a special automatic query. Note: Navigation ... . Instead, employees is automatically populated when a Department entity is retrieved from ... , the order of the retrieved owner entities can be set by the OrderBy annotation: @Entity public class
16

DELETE Queries in JPA/JPQL

As explained in chapter 2, entity objects can be deleted from the database by: Retrieving ... an alternative way for deleting entity objects. Unlike SELECT queries, which are used to retrieve data from the database, DELETE queries do not retrieve data from the database, but when executed, delete specified
1

[ODB1] Chapter 2 - A Quick Tour

ArrayList list; 18 try { 19 // Retrieve the list from the database by ... is expected to be retrieved from the database by its name "Hello World" using the getObjectById ... retrieved from the database is always persistent. A new object becomes persistent when it is bound

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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