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Manual
16

Paths and Types in JPQL and Criteria API

Instances of user defined persistable classes (entity classes, mapped super classes and embeddable classes) are represented in JPQL by the following types of expressions: Variables - FROM identification variables and SELECT result variables. Parameters - when instances of these classes are assigned
Forum
15

Insert a new entity class in a class hierarchy does not work

Hello, we have an entity class hierarchy and we want to insert a new entity in this hierarchy ... , because the class hierarchy had already always existed and the "new" entity class needed ... would be also inserted new in the class hierarchy then it works well. See our example in the attachments. Execute
Manual
15

Index Definition

.annotations.Unique; @Entity public class EntityWithSimpleIndex { @Index String ... , float, double. Equivalent wrapper classes from package java.lang: Byte, Short, Character, Integer ... ","firstName"}) public class EntityWithCompositeIndex { String firstName; String lastName
Manual
15

Retrieving JPA Entity Objects

of entity classes and to keep them simple as possible. Retrieval by Class and Primary Key Every entity object can be uniquely identified and retrieved by the combination of its class and its primary key ... whose primary key is 1: Employee employee = em.find(Employee.class, 1); Casting of the retrieved
Tutorial
15

Step 3: Define an EJB Session Bean

Operations on the database will be performed by an instance of a session bean (EJB) class that we will define in this step: Open the [New Java Class] dialog box by right clicking the guest package node (in the [Package Explorer] window) and selecting New > Class. The package name should be guest
Manual
15

Database Explorer

objects. The [Schema] window shows the user defined persistable types (entity and embeddable classes ... an element for viewing (an entity class in the [Schema] tabbed window, a bookmark in the [Database ... the entity class and specify the number of objects to construct. Click the Create and Persist button
Result
15

ObjectDB Object Database Features

entity classes per database file. Up to 2,147,483,648 indices per database file ... . Class hierarchy changes are handled automatically. New added fields are handled automatically ... fields up and down in the class hierarchy is transparent. Support for renaming types, fields
Forum
15

Using your own classes in the entity class?

Using your own classes in the entity class?
Tutorial
14

Step 3: Define an EJB Session Bean

Operations on the database will be performed by an instance of a session bean (EJB) class ... ) > Session Bean and clicking Next. Enter GuestDao as the EJB class name - use exactly that case sensitive class name. The Java package name should be guest. Click Finish to create the new session bean (EJB
Manual
13

Entity Management Settings

JRE) or above. The reflection attribute specifies how non enhanced classes are handled. ObjectDB can manage non enhanced classes by using reflection at the cost of performance. The possible values of the reflection attribute represent different policies: "error" - all persistable classes