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92

JPQL query to get entities that does not have a child entity in their child entities

' and not 'Finished'. I have entities for Job and Status with NamedQueries on Job entity and using
32

Bindable.BindableType.ENTITY_TYPE

Enum Constant javax.persistence.metamodel.Bindable.BindableType ENTITY_TYPE Entity type Since: JPA 2.0
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SqlResultSetMapping.entities

Annotation Element javax.persistence.SqlResultSetMapping EntityResult[] entities Specifies the result set mapping to entities. Default value: {} Since: JPA 1.0
24

JPA Persistable Types

. ObjectDB supports all the JPA persistable types, which are: User defined classes - Entity classes ... types and Serializable types (user or system defined). Note: Only instances of entity classes can be stored in the database directly. Other persistable types can be embedded in entity classes as fields
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JPA Lifecycle Events

Callback methods are user defined methods that are attached to entity lifecycle events ... methods are methods that are defined within an entity class. For example, the following entity class defines all the supported callback methods with empty implementations: @Entity public static class
22

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
17

Database Explorer

general information about the database and the bottom sub window displays a list of bookmarked entity objects. The [Schema] window shows the user defined persistable types (entity and embeddable classes) in ... an element for viewing (an entity class in the [Schema] tabbed window, a bookmark in the [Database
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SELECT clause (JPQL / Criteria API)

The ability to retrieve managed entity objects is a major advantage of JPQL. For example ... > results = query.getResultList(); Because the results are managed entity objects they have all the support that JPA provides for managed entity objects, including transparent navigation to other database
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Index Definition

Querying without indexes requires iteration over entity objects in the database one by one. This may take a significant amount of time if many entity objects have to be examined. Using proper indexes ... a standard method for declaring indexes, but JDO does. The following entity definition uses JDO’s
16

Removing of an entity removes also another entity type

Hello, we have following case: All entities must be enhanced, because see Issue #303. ToleranceDefinition and ResolverMapping are entities and have not any relations each other. Before start transaction the ToleranceDefinition entities exist already in the database. The transaction starts

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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