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The term persistable types refers to data types that can be used for storing data in the database. ObjectDB supports all the JPA persistable types , which are: User defined classes - Entity classes, Mapped superclasses, Embeddable classes. Simple Java data types : Primitive types , Wrappers, String

classes) are represented in JPQL by the following types of expressions: Variables - FROM ... . But more often they are used in JPQL path expressions that navigate to values of simple types (number, boolean, string, date). Simple type values are more useful in queries. They have special operators

The following interfaces and enum represent types in the JPA Metamodel API:  See the Metamodel Type Interface Hierarchy section for more details and examples.

This section contains the most essential JPA types .

that Java reflection provides for general Java types . The Metamodel Interface The main interface of the JPA ... types  (which are referred to as managed types ) in the persistent object model. Three methods can be used to retrieve sets of types : // Get all the managed classes: // (entity classes

name and either the same type or a convertible type , as explained below. A matching field ... the hierarchy, removing an intermediate class in the hierarchy, etc.). Convertible Types When an old matching field is found but its type is different than the type of the new field (with the same name

 and type versioning. Class hierarchy changes are handled automatically. New added fields are handled automatically. Removed fields are handled automatically. Most field type changes are handled ... types , fields and properties . Object Model & Data Types ObjectDB supports persisting complex Java

Literals in JPQL, as in Java, represent constant values. JPQL supports various types of literals ... (e.g. 'abc' ), enum literals (e.g. mypackage.MyEnum.MY_VALUE ) and entity type literals (e.g. Country ... the ordinary Java syntax for enum values, but the fully qualified name of the enum type

JPA Interface Type Type Parameters: - The type of the represented object or attribute Instances of the type Type represent persistent object or attribute types . Since: JPA 2.0 Public Methods Class getJavaType () Return the represented Java type . Return: Java type Since: JPA 2.0 Type

.metamodel. Type $PersistenceType Since: JPA 2.0 Enum Constants BASIC Basic type Since: JPA 2.0 EMBEDDABLE ... Since: JPA 2.0 Public Static Enum Methods: Type $PersistenceType[] values () Returns an array containing the constants of this enum type , in the order they are declared. This method may be used to iterate

(   String name,    Class   type ) Return the single-valued attribute of the managed type that corresponds to the specified name and Java type . Parameters: name - the name of the represented attribute type - the type of the represented attribute Return: single-valued

getDeclaredSingularAttribute (   String name,    Class   type ) Return the single-valued attribute declared by the managed type that corresponds to the specified name and Java type . Parameters: name - the name of the represented attribute type - the type of the represented attribute Return

;attributeName,    Class   type ) Add a node to the graph that corresponds to a map key that is a managed type with inheritance. This allows for construction of multi-node entity graphs that include related managed types . Subclass subgraphs will include the specified attributes

;attributeName,    Class   type ) Add a node to the graph that corresponds to a managed type ... subgraphs Parameters: attributeName - name of the attribute type - entity subclass Return: subgraph ... of this managed type . IllegalArgumentException - if the attribute's target type is not a managed type

;attribute,    Class   type ) Add a node to the graph that corresponds to a map key that is a managed type with inheritance. This allows for construction of multi-node entity graphs that include related managed types . Subclass subgraphs will automatically include the specified

;attributeName,    Class   type ) Add a node to the graph that corresponds to a map key that is a managed type with inheritance. This allows for construction of multi-node entity graphs that include related managed types . Subclass subgraphs will automatically include the specified

;attributeName,    Class   type ) Add a node to the graph that corresponds to a managed type with inheritance. This allows for multiple subclass subgraphs to be defined for this node ... subgraphs. Parameters: attributeName - name of the attribute type - entity subclass Return: subgraph

JPA Method in javax.persistence.criteria.Expression Expression as (   Class   type ... cause type conversion: the runtime type is not changed. Warning: may result in a runtime failure. Parameters: type - intended type of the expression Return: new expression of the given type Since: JPA 2.0

;Class   type ) Return the attribute that corresponds to the id attribute of the entity or mapped superclass. Parameters: type - the type of the represented id attribute Return: id attribute Throws: IllegalArgumentException - if id attribute of the given type is not present in the identifiable

; Class   type ) Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared id attribute Return: declared id attribute Throws: IllegalArgumentException - if id attribute of the given type

;   Class   type ) Get the parameter object corresponding to the declared positional parameter with the given position and type . This method is not required to be supported by the provider. Parameters: position - position type - type Return: parameter object Throws

;   Class   type ) Get the parameter object corresponding to the declared parameter of the given name and type . This method is required to be supported for criteria queries only. Parameters: name - parameter name type - type Return: parameter object Throws: IllegalArgumentException

;attribute,    Class   type ) Add a node to the graph that corresponds to a managed type with inheritance. This allows for multiple subclass subgraphs to be defined for this node ... subgraphs Parameters: attribute - attribute type - entity subclass Return: subgraph for the attribute

JPA Annotation Attribute in javax.persistence.ColumnResult Class type default void.class (Optional) The Java type to which the column type is to be mapped. If the type element is not specified, the default JDBC type mapping for the column will be used. Since: JPA 2.1

;attribute,    Class   type ) Add a node to the graph that corresponds to a map key that is a managed type with inheritance. This allows for construction of multi-node entity graphs that include related managed types . Subclass subgraphs will include the specified attributes

; type ) Add additional attributes to this entity graph that correspond to attributes of subclasses of this EntityGraph's entity type . Subclass subgraphs will automatically include the specified attributes of superclass subgraphs. Parameters: type - entity subclass Return: subgraph for the subclass

JPA Method in javax.persistence.criteria.CriteriaBuilder Root treat (    Root  root,    Class   type ) Downcast Root object to the specified type . Parameters: root - root type - type to be downcast to Return: Root object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder Path treat (   Path  path,    Class   type ) Downcast Path object to the specified type . Parameters: path - path type - type to be downcast to Return: Path object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder Join treat (    Join  join,    Class   type ) Downcast Join object to the specified type . Parameters: join - Join object type - type to be downcast to Return: Join object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder MapJoin treat (    MapJoin  join,    Class   type ) Downcast MapJoin object to the specified type . Parameters: join - MapJoin object type - type to be downcast to Return: MapJoin object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder ListJoin treat (    ListJoin  join,    Class   type ) Downcast ListJoin object to the specified type . Parameters: join - ListJoin object type - type to be downcast to Return: ListJoin object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder SetJoin treat (    SetJoin  join,    Class   type ) Downcast SetJoin object to the specified type . Parameters: join - SetJoin object type - type to be downcast to Return: SetJoin object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder CollectionJoin treat (    CollectionJoin  join,    Class   type ) Downcast CollectionJoin object to the specified type . Parameters: join - CollectionJoin object type - type to be downcast to Return: CollectionJoin object of the specified type Since: JPA 2.1

;attribute,    Class   type ) Add a node to the graph that corresponds to a managed type with inheritance. This allows for multiple subclass subgraphs to be defined for this node ... subgraphs. Parameters: attribute - attribute type - entity subclass Return: subgraph

(   Class   type ) Return the attribute that corresponds to the version attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared ... attribute of the type is not declared in the identifiable type Since: JPA 2.0

; Class   type ) Return the attribute that corresponds to the version attribute of the entity or mapped superclass. Parameters: type - the type of the represented version attribute Return: version attribute Throws: IllegalArgumentException - if version attribute of the given type is not present in the identifiable type Since: JPA 2.0

  type ) Get the value of the element at the specified position in the result tuple. The first position is 0. Parameters: i - position in result tuple type - type of the tuple element Return: value of the tuple element Throws: IllegalArgumentException - if i exceeds length of result tuple or element cannot be assigned to the specified type Since: JPA 2.0

JPA Method in javax.persistence.metamodel. Type Type .PersistenceType getPersistenceType () Return the persistence type . Return: persistence type Since: JPA 2.0

JPA Method in javax.persistence.criteria.Path Expression type () Create an expression corresponding to the type of the path. Return: expression corresponding to the type of the path Since: JPA 2.0

This section contains miscellaneous JDO types :

-superclass attribute. identity- type and objectid-class The identity- type and objectid-class attributes ... and persistent in JDO), or a field whose declared type is java.lang.Object or some interface, but holds at runtime only values of persistent types . Specifying a none value, as demonstrated by field f1 , changes

if the field exists but its type cannot be compared with an int value, a JDOUserException is thrown ... much faster. The execute() method returns a Collection instance, but its declared return type is Object ... the candidate collection . A Query instance for this type of query can be obtained by

). 3.2  Persistent Fields and Types Storing a persistent object in the database does not ... transient , and have persistent types . Every persistent class is a persistent type . The following predefined system types are also persistent types : All the primitive types - boolean , byte , short , char

object, regardless of its type . Instances of persistent classes can become persistent later, as ... reachability is applicable to all persistent types , including system types , such as String and ArrayList (a complete list of persistent types is available at section 3.2 ). ObjectDB provides an additional

JDO Annotation Attribute in javax.jdo.annotations.Persistent Class[] types default {} Types of the member. Used when the declared member type is a supertype of the actual type that is stored in the member. For example, the declared member type might be an interface type that must contain an object of a concrete type when used for persistence. Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations.Value Class[] types default {} Types of the values. This can be determined if using JDK1.5 generics but is required otherwise. Multiple types can be specified if the implementation supports multiple types . Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations.Key Class[] types default {} Types of the keys. This can be determined if using JDK1.5 generics but is required otherwise. Multiple types can be specified if the implementation supports multiple types . Since: JDO 2.1

JDO Constructor in javax.jdo.listener.InstanceLifecycleEvent InstanceLifecycleEvent (   Object source,    int  type ) Creates a new event object with the specified source and type . Parameters: source - the instance that triggered the event type - the event type Since: JDO 2.0

;Object source,    int  type ,    Object target ) Creates a new event object with the specified source , type , and target . Parameters: source - the instance that triggered the event type - the event type target - the "other" instance Since: JDO 2.0

JDO Annotation Attribute in javax.jdo.annotations.Element Class[] types default {} Types of the elements. This can be determined if using JDK1.5 generics but is required otherwise. Multiple types can be specified if the implementation supports multiple types . Since: JDO 2.1