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Manual
13

Storing JPA Entity Objects

New entity objects can be stored in the database either explicitly by invoking the persist method ... an instance of the Employee entity class in the database: Employee employee = new Employee("Samuel ... and changes its state to Managed. The new entity object is stored in the database when the transaction
Manual
12

FROM clause (JPQL / Criteria API)

The FROM clause declares query identification variables that represent iteration over objects in the database. A query identification variable is similar to a variable of a Java enhanced for loop in ... at the WHERE clause level by using a type expression. For example, in the following query, c iterates
Manual
12

Retrieving JPA Entity Objects

entity object is not found in the persistence context a new object is constructed and filled ... . Therefore, it is recommended to avoid unnecessary time consuming operations in no-arg constructors ... object in its persistence context no retrieval is required and the existing managed object is returned
Result
12

Apache License, Version 2.0, January 2004

mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). "Derivative Works" shall mean any work, whether in Source or Object form
Manual
12

JPA Criteria API Queries

in a form that contains many optional fields - is expected to be cleaner when using the JPA ... operations. String based JPQL queries and JPA criteria based queries are equivalent in power and in ... (both methods are equivalent). In the example above a CriteriaQuery instance is created for representing
Manual
12

JPA / JDO Class Enhancer

to be enhanced. Enhancement improves efficiency in three ways: Enhanced code enables efficient ... explained in the chapter 3). This is done by adding special code to enhanced classes that automatically ... . Command Line Enhancement ObjectDB Enhancer is a Java console application. It is contained in the objectdb
Manual
12

Database Schema Evolution

of an entity class are detected by ObjectDB. New entity objects have to be stored in the new class schema, and old entity objects, which were stored previously in the old class schema, have to be converted to the new schema. Note: In client-server mode the ObjectDB server must be restarted
Manual
12

Working with JPA Entity Objects [2011-04-18]

Entity objects are in-memory instances of entity classes (persistable user defined classes), which can represent physical objects in the database. Managing an ObjectDB Object Database using JPA ... : New, Managed, Removed and Detached. When an entity object is initially created its state is New.  In
Manual
12

Working with JPA Entity Objects

Entity objects are in-memory instances of entity classes (persistable user defined classes), which can represent physical objects in the database. Managing an ObjectDB Object Database using JPA ... : New, Managed, Removed and Detached. When an entity object is initially created its state is New.  In
Manual
11

JPA Primary Key

Every entity object that is stored in the database has a primary key. Once assigned, the primary key cannot be modified. It represents the entity object as long as it exists in the database. As ... that is absent from other object oriented databases. Entity Identification Every entity object in