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Query Parameters in JPA

with different parameter values to retrieve different results. Running the same query multiple times ... of :name itself is String. Queries can include multiple parameters, and each parameter can occur multiple times in the query string. A query can be run only after setting values for all its parameters

Detached Entity Objects

that are referenced by that field (multiple entity objects can be referenced by a collection field ... that are referenced by that field (multiple entity objects can be referenced by a collection field

JPA Persistable Types

only once even if they are referenced multiple times. Referencing instances of other persistable types from multiple

Numbers in JPQL and Criteria Queries

: + (addition), - (subtraction), * (multiplication) and / (division). ObjectDB also supports the % (modulo ... - expression // Multiplication (*) Expression<Integer> prod1 = cb.prod(path, param); // 2

Database Connection using JPA

functionality for performing operations on a database. Many applications require multiple database connections ... . a pool of sockets), provides an efficient way to construct multiple EntityManager instances

Running JPA Queries

should be ran using the getResultList method, as we expect to receive multiple objects in return ... of this assumption depends on the content of the database. If the database contains multiple Country objects

Criteria Query Selection and Results

of Expression, any criteria expression can be used as the SELECT clause content. Multiple selection ... of a query with multiple expressions in the SELECT clause) using tuples: The Tuple interface


name) for iteration. Multiple variables and JOIN are not supported. The SET clause defines one or more field update expressions (using the range variable name - if defined). Multiple field update

ObjectDB Object Database Features

- multiple @Id fields or a @EmbeddedId field. Primary Key Data Types Primitives (boolean, byte, short ... ) in annotations (@NamedQuery) and XML. Query parameters for efficient reuse of one query in multiple

[ODB1] Chapter 5 - JDO Connections

6). 5.1 javax.jdo.PersistenceManagerFactory Most applications require multiple database connections ... the PersistenceManager. Multiple READ locks of different PersistenceManager instances on the same object

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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