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9

Setting and Tuning of JPA Queries

> For an EntityManagerFactory - using the createEntityManagerFacotory method:   Map<String,Object> properties ... the createEntityManager method:   Map<String,Object> properties = new HashMap();   properties
9

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 ... class. The dot (.) operator cannot be applied to collections, maps and values of simple types
9

What is the Java Persistence API (JPA)?

are Object Relational Mapping (ORM) tools. The mapping bridges between the data representation in
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javax.persistence.AttributeOverride

get methods) Used to override the mapping of a Basic (whether explicit or default) property or field or Id property or field. May be applied to an entity that extends a mapped superclass or to an embedded field or property to override a basic mapping or id mapping defined by the mapped superclass or
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javax.persistence.criteria.From

> get( MapAttribute<X,K,V> map) Create a path corresponding to the referenced map-valued attribute. Create a path corresponding to the referenced map-valued attribute. Parameters: map - map-valued ... : the resulting join Since: JPA 2.0 MapJoin<X,K,V> join( MapAttribute<?,K,V> map) Create an inner join
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javax.persistence.criteria.Join

Since: JPA 2.0 Expression<M> get( MapAttribute<X,K,V> map) Create a path corresponding to the referenced map-valued attribute. Create a path corresponding to the referenced map-valued attribute. Parameters: map - map-valued attribute Returns: expression corresponding to the referenced attribute
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javax.persistence.criteria.ListJoin

otherwise exist Since: JPA 2.0 Expression<M> get( MapAttribute<X,K,V> map) Create a path corresponding to the referenced map-valued attribute. Create a path corresponding to the referenced map-valued attribute. Parameters: map - map-valued attribute Returns: expression corresponding to the referenced attribute
1

Step 6: Set the Spring XML

> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>*.html</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30
0

[ODB1] Chapter 3 - Persistent Classes

, LinkedList, Vector, HashMap, TreeMap and Hashtable, and the interfaces - Collection, Set, List and Map ... collection interfaces (Collection, Set, List and Map) cannot refer to an unsupported collection, or
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javax.jdo.JDOHelper

See Also: getPersistenceManagerFactory(Map,String,ClassLoader,ClassLoader) PersistenceManagerFactory getPersistenceManagerFactory(Map ... See Also: getPersistenceManagerFactory(java.util.Map,ClassLoader) PersistenceManagerFactory getPersistenceManagerFactory(File ... : name - Since: JDO 2.1 See Also: getPersistenceManagerFactory(Map,String,ClassLoader,ClassLoader

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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