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kuni katsuya

Mapping JPA Entities To SQL Views - It Works Even With Derby : Adam Bien's Weblog - 0 views

www.adam-bien.com/...mapping_jpa_entities_on_view

jpa views entity

shared by kuni katsuya on 24 Jul 12 - Cached
  • Mapping JPA Entities To SQL View
  • return a different “view” to the client
  • Especially in the context of pagination, where the data is mostly retrieved for read-only purposes, database views are the easier and more efficient alternative. Instead of implementing a lot of plumbing on the “Java-side” all the work could be easily done in the database
  • ...1 more annotation...
  • There is a drawback: not all views are updatable. Whether a view is updatable or not highly depends on the complexity and particular database
kuni katsuya

In Relation To...  Some tips on using Hibernate in JBoss AS 7.0.0.Final - 1 views

relation.to/...singHibernateInJBossAS700Final

shared by kuni katsuya on 14 Jun 12 - No Cached
  • Some tips on using Hibernate in JBoss AS 7.0.0.Final
  • migrating Hibernate 3-based applications to JBoss AS7,
  • Container-deployed persistence units
  • ...6 more annotations...
  • Application-created persistence units
  • Native Hibernate applications
  • native (i.e. non-JPA)
  • JPA applications that create an EntityManagerFactory on their own, either using the PersistenceProvider SPI directly or through an intermediary mechanism such as Spring's LocalContainerEntityManagerFactoryBean
  • standard Java EE-applications may ignore the provider implementation and rely on the standard features provided by the container - JBoss AS7 supporting standard JPA 1.0 and 2.0
  • future versions of JBoss AS7 it will be possible to use alternative persistence provider implementations
kuni katsuya

Chapter 15. Data Management - 1 views

www.graniteds.org/...graniteds.datamanagement.html

graniteds tide DataManagement

shared by kuni katsuya on 23 Apr 13 - No Cached
  •  abstractEntity.uid();
    • kuni katsuya
      kuni katsuya on 23 Apr 13
       
      sets the uid before persist
  •  UUID.randomUUID().toString();
  • AbstractEntity 
  • ...70 more annotations...
  • @MappedSuperclass
  • Important things on ID/UID
  • entity lives in three layers:
  • Flex client
  • JPA persistence context
  • database
  • When updating existing entities coming from the database
  • id is defined and is maintained in the three layers during the different serialization/persistence operations
  • when a new entity is being created in any of the two upper layers (Flex/JPA)
  • new entity has no id until it has been persisted to the database
  • most common solution is to
  • have a second persisted id, the uid
  • which is created by the client and persisted along with the entity
  • recommended approach to avoid any kind of subtle problems is to have a real uid property which will be persisted in the database but is not a primary key for efficiency concerns
  • You can now ask Tide to
  • limit the object graph before sending it
  • Flex with the following API :
  • EntityGraphUnintializer
  • uninitializeEntityGraph
  • Person object will be uninitialized
  • uperson contains
  • only the minimum of data
  • to correctly merge your changes in the server persistence context
  • Tide uses the
  • client data tracking
  • to determine which parts of the graph need to be sent
  • Calling the EntityGraphUninitializer manually is a bit tedious and ugly, so there is a cleaner possibility when you are using generated typesafe service proxies
  • annotate your service method arguments with @org.granite.tide.data.Lazy :
  • @Lazy
  • take care that you have added the [Lazy] annotation to your Flex metadata compilation configuration
  • in the Flex application, register the UninitializeArgumentPreprocessor component in Tide as follows :
  • [UninitializeArgumentPreprocessor]
  • all calls to PersonService.save() will
  • automatically use a properly uninitialized version
  • of the person argument.
  • 15.4. Dirty Checking and Conflict Handling
  • simplify the handling of data between Flex and Java EE
  • Chapter 15. Data Management
  • Tide maintains a client-side cache of entity instances and ensures that every instance is unique in the Flex client context
  •  uid().hashCode();
  • Tide currently only supports Integer or Long version fields, not timestamps and that the field must be nullable
  • in a multi-tier environment (@Version annotation)
  • highly recommended to use
  • JPA optimistic locking
  • highly recommended to add a
  • persistent uid field
  • AbstractEntity
  • in general this identifier will be
  • initialized from Flex
  • @Column(name="ENTITY_UID", unique=true, nullable=false, updatable=false, length=36)     private String uid;
  • @Version     private Integer version;
  • uid().equals(((AbstractEntity)o).uid())
  • consistent identifier through all application layers
  • @PrePersist
  • 15.3. Reverse Lazy Loading
  • 15.4. Dirty Checking and Conflict Handling
  • 15.4. Dirty Checking and Conflict Handling
  • 15.4. Dirty Checking and Conflict Handling
  • Dirty Checking and Conflict Handling
  • entity instance can be in two states :
  • Stable
  • Dirty
  • property meta_dirty is
  • bindable
  • could be used
  • to enable/disable a Save button
  • correct way of knowing if any object has been changed in the context, is to use the property meta_dirty of the Tide context
  • tideContext.meta_dirty
  • reliable when using optimistic locking
  • check that its @Version field has been incremented
kuni katsuya

jpa - When to use EntityManager.find() vs EntityManager.getReference() - Stack Overflow - 0 views

stackoverflow.com/...-vs-entitymanager-getreference

java JPA EntityManager find getReference

shared by kuni katsuya on 20 Nov 12 - No Cached
  • When to use EntityManager.find() vs EntityManager.getReference()
  • use getReference method when i do not need to access database state
  • getReference returns a proxy object which uses a powerful feature called
  • ...1 more annotation...
  • automatic dirty checking
  • kuni katsuya on 20 Nov 12
     
    "When to use EntityManager.find() vs EntityManager.getReference()"
kuni katsuya

Introduction to EclipseLink JPA (ELUG) - Eclipsepedia - 0 views

wiki.eclipse.org/_to_EclipseLink_JPA_%28ELUG%29

java JPA inheritance mapping EclipseLink

shared by kuni katsuya on 20 Nov 12 - No Cached
  • kuni katsuya on 20 Nov 12
     
    "Mapping Inheritance"
kuni katsuya

Advanced entity association mappings (Hibernate) - 0 views

what-when-how.com/...association-mappings-hibernate

java JPA AssociationMapping TernaryAssociation PolymorphicAssociation

shared by kuni katsuya on 13 Dec 12 - No Cached
  • Ternary associations
  • Figure 7.12 A ternary association with a join table between three entities
  • Polymorphic associations
  • ...11 more annotations...
  • Polymorphic many-to-one associations
  • Polymorphic collections
  • Polymorphic associations to unions
  • Polymorphic table per concrete class
  • Fully polymorphic behavior is available, but there is no annotation support for any mappings.
  • Hibernate supports fully polymorphic behavior. It provides extra support for any association mappings to an inheritance hierarchy mapped with implicit polymorphism.
  • Hibernate Core
  • Table 7.1 Hibernate and JPA comparison chart
  • Java Persistence and EJB 3.0
  • Advanced entity association mappings (Hibernate)
  • Mapping maps
kuni katsuya

Chapter 3. Project Setup - 0 views

www.graniteds.org/...graniteds.projectsetup.html

graniteds maven

shared by kuni katsuya on 19 May 12 - No Cached
kuni katsuya

DomainPermission (Apache Shiro 1.2.1 API) - 0 views

shiro.apache.org/...DomainPermission.html

ApacheShiro DomainPermission JPA

shared by kuni katsuya on 29 Aug 12 - No Cached
  • used as a base class for JPA/Hibernate persisted permissions that wish to store the parts of the permission string in separate columns (e.g. 'domain', 'actions' and 'targets' columns)
kuni katsuya

Java Persistence/Auditing and Security - Wikibooks, open books for an open world - 0 views

en.wikibooks.org/...Auditing_and_Security

jpa auditing security

shared by kuni katsuya on 25 Jul 12 - No Cached
  • Use a common database user id, and manage auditing and security in the application
  • managed in the application by having an application user, and a single shared database user
  • adding a AUDIT_USER and AUDIT_TIMESTAMP column to all of the audited tables and auditUser and auditTimestamp field to all of the audited objects
  • ...5 more annotations...
  • When the application inserts or updates an object, it will set these fields and they will be stored in the database. JPA events could also be used to record the audit information, or to write to a separate audit table.
  • Example AuditedObject class
  • @MappedSuperclass public Class AuditedObject {
  • @Column("AUDIT_USER"); protected String auditUser; @Column("AUDIT_TIMESTAMP"); protected Calendar auditTimestamp;
  • @PrePersist @PreUpdate public void updateAuditInfo() { setAuditUser((String)AuditedObject.currentUser.get()); setAuditTimestamp(Calendar.getInstance()); }
  • kuni katsuya on 25 Jul 12
     
    Use a common database user id, and manage auditing and security in the application
kuni katsuya

7. Tide Framework - Confluence - 0 views

www.graniteds.org/...7.+Tide+Framework

graniteds Tide documentation

shared by kuni katsuya on 09 Aug 12 - No Cached
  • GDS/Tide project represents the Data Services part of GDS
  • comparable to LiveCycle Data Services, which is neither open source nor free, as it provides similar features such as client container of managed entities, data paging, and integration with server components, but it is based on completely different principles:
  • strongly typed Hibernate/JPA detached objects
  • ...5 more annotations...
  • All managed entity instances are unique in a Tide context
  • Tide keeps the classic three layers web architecture, when LCDS removes the service layer, and is some kind of remote JPA provider for Flex applications
  • Tide approach is to minimize the amount of code needed to make things work between the client and the server
  • principles are very similar to the ones of JBoss Seam, which is the main reason why the first integration of Tide has been done with this framework. Integrations with Spring, EJB 3 and CDI are also available
  • need to compile your MXML/AS sources with the granite-essentials.swc and granite.swc libraries
kuni katsuya

Article Series: Migrating Spring Applications to Java EE 6 - Part 1 | How to JBoss - 1 views

howtojboss.com/...plications-to-java-ee-6-part-1

spring javaee6 migration

shared by kuni katsuya on 06 Jun 12 - No Cached
  • In fact people still love those books without realizing that the world has changed dramatically ever since
  • The reality check here is to wonder whether the rhetorics set forth by Rod Johnson in his 2003/2004 books are still actual today
  • So if you still care about those books, the best way to show your appreciation is probably to use them as your monitor stand
  • ...21 more annotations...
  • The discussion whether or not to use Spring vs. Java EE for new enterprise Java applications is a no-brainer
  • Why migrate?
  • since then fallen a prey to the hungry minds of Venture Capitalists and finally into the hands of a virtualization company called VMware
  • While the different companies and individuals behind the Spring framework have been doing some work in the JCP their voting behavior on important JSRs is peculiar to say the least
  • outdated ORM solution like JDBC templates
  • some developers completely stopped looking at new developments in the Java EE space and might have lost track of the current state of technology
  • size of the deployment archive
  • fairly standard Java EE 6 application will take up about 100 kilobytes
  • comparable Spring application weighs in at a whopping 30 Megabytes!
  • Lightweight
  • Firing up the latest JBoss AS 7 Application Server from scratch and deploying a full blown Java EE 6 application into the server takes somewhere between two and five seconds on a standard machine. This is in the same league as a Tomcat / Spring combo
  • Dependency injection
  • Java EE 6, the Context and Dependency Injection (CDI) specification was introduced to the Java platform, which has a very powerful contextual DI model adding extensibility of injectable enterprise services
  • Aspect Oriented Programming
  • “AOP Light” and this is exactly what Java EE Interceptors do
  • common pitfall when taking AOP too far is that your code might end up all asymmetric and unreadable. This is due to the fact that the aspect and its implementation are not in the same place. Determining what a piece of code will do at runtime at a glance will be really hard
  • Testing
  • With Arquillian we can get rid of mocking frameworks and test Java EE components in their natural environment
  • Tooling
  • capabilities comparison matrix below to map Spring’s technology to that of Java EE
  • Capability Spring JavaEE Dependency Injection Spring Container CDI Transactions AOP / annotations EJB Web framework Spring Web MVC JSF AOP AspectJ (limited to Spring beans) Interceptors Messaging JMS JMS / CDI Data Access JDBC templates / other ORM / JPA JPA RESTful Web Services Spring Web MVC (3.0) JAX-RS Integration testing Spring Test framework Arquillian *
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