About retrieve

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Manual
15

JPA Primary Key

the database is uniquely identified (and can be retrieved from the database) by the combination of its type ... is required if entity objects have to be retrieved by their primary key as shown in the Retrieving ... that queries that retrieve all the events of a specified sensor in a specified period are common and return
Manual
15

UPDATE SET Queries in JPA/JPQL [2011-11-22]

Existing entity objects can be updated, as explained in chapter 2, by: Retrieving the entity ... an alternative way for updating entity objects. Unlike SELECT queries, which are used to retrieve data from the database, UPDATE queries do not retrieve data from the database, but when executed, update
Manual
15

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
JDO Doc
13

javax.jdo.PersistenceManager

retrieve(Object pc) Retrieve field values of an instance from the store. Retrieve field values ... the instance, and its field values must be retrieved. The PersistenceManager might use policy information about the class to retrieve associated instances. Parameters: pc - the instance Since: JDO 1.0 void
JPA Doc
13

JPA Exceptions

to retrieve entity objects from the database. For example, when a required entity object is not found: or during query execution: The lock exceptions (above) may also be thrown during retrieval, if database lock has been requested for retrieved entity objects and it cannot be granted.
Manual
13

WHERE clause (JPQL / Criteria API)

JPQL query that retrieves selective objects from the database. Out of the four optional clauses ... The following query retrieves only countries with population size that exceeds a specified limit ... filters tuples before passing them to the SELECT clause. For example, the following query retrieves
Manual
13

FROM clause (JPQL / Criteria API)

, consider the following INNER JOIN query that retrieves pairs of (country name, capital name): SELECT c ... instances.  Consequently, the loop that iterates over the results is inefficient, since retrieval ... Country objects because it eliminates the need for retrieving the associated Capital objects separately
Manual
13

SELECT clause (JPQL / Criteria API)

The ability to retrieve managed entity objects is a major advantage of JPQL. For example ... are also supported. For example, the following query retrieves the name of the capital city ... with the containing entities. Therefore, embedded objects that are retrieved directly by a result path expression
Manual
13

Logical Operators in JPQL and Criteria API

retrieves countries whose population and area (both) exceed specified limits: SELECT c FROM ... The following query retrieves countries whose population or area exceeds a specified limit: SELECT c FROM ... query retrieves all the countries whose population does not exceed a specified limit: SELECT c FROM
Manual
13

JPA Query Structure (JPQL / Criteria)

classes and objects. For example, a JPQL query can retrieve and return entity objects ... ...]] [ORDER BY ...] The first two clauses, SELECT and FROM are required in every retrieval query ... JPQL Query The following query retrieves all the Country objects in the database: SELECT c FROM