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JDO Doc
17

javax.jdo.PersistenceManager

the PersistenceManagerFactory (recommended) or by construction. Since: JDO 1.0   void ... JDOUserException if the instance is transient or is managed by another PersistenceManager. Parameters: pc ... for detachment (DETACH_LOAD_FIELDS and DETACH_UNLOAD_FIELDS) and the active fetch groups determine the scope
Manual
17

DELETE Queries in JPA/JPQL

cannot include multiple variables and JOIN, and cannot include the GROUP BY, HAVING and ORDER BY clauses ... As explained in chapter 2, entity objects can be deleted from the database by: Retrieving ... transaction, either explicitly by calling the remove method or implicitly by a cascading operation
Manual
17

JPA Criteria API Queries

, construct). FROM clause (from, join, fetch). WHERE clause (where). GROUP BY / HAVING clauses (groupBy ... , are defined by instantiation of Java objects that represent query elements. A major advantage of using ... factory of criteria queries and criteria query elements. It can be obtained either by
Manual
17

UPDATE SET Queries in JPA/JPQL

queries cannot include the GROUP BY, HAVING and ORDER BY clauses, but the WHERE clause ... Existing entity objects can be updated, as explained in chapter 2, by: Retrieving the entity ... . Applying changes to the database by calling the commit method. JPQL UPDATE queries provide
Manual
16

JPA Persistence Unit

A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes ... is optional when using ObjectDB, but required by JPA. persistence.xml Persistence units are defined in ... -unit> A persistence unit is defined by a persistence-unit XML element
JPA Doc
16

Criteria Query From Elements

The interfaces in this group are in use for setting a criteria query FROM clause. Criteria Query ... are represented in criteria queries by descendant interfaces of the From interface: Range variables (bound by an entity class) are represented by the Root subinterface: Join variables (bound by
Tutorial
15

Getting Started with JPA

to start by running a live sample application in your IDE, you should be able to follow this tutorial
Manual
14

Auto Generated Values

number generator is also used to generate numeric values for primary key fields annotated by ... ) and an allocation size (the default is 50). A sequence is global to the application and can be used by ... . To minimize round trips to the database server, IDs are allocated in groups. The number of IDs in each
Manual
14

JPA Query Expressions (JPQL / Criteria)

Query expressions are the foundations on which JPQL and criteria queries are built. Every query consists of clauses - SELECT, FROM, WHERE, GROUP BY, HAVING and ORDER BY, and each clause consists ... of at least one atomic component. More complex query expressions are built by combining atomic
JDO Doc
12

javax.jdo.Query

: group - a comma-delimited list of expressions, optionally followed by the "having" keyword ... with a PersistenceManager. Multiple queries might be executed simultaneously by different threads ... , import statements, ordering and grouping specifications, result and result class, the range