hibernate-session | 易学教程

Hibernate first level cache - does it Sync?

阅读更多关于 Hibernate first level cache - does it Sync?

问题 I am aware of the fact that Session is first level cache used by Hibernate , and once we retrieve an entity from the session , the subsequent get calls for the same entity with same identifier is fetched from the session instead of DB, until the session is Open . Having said that, I have a doubt regarding how hibernate syncs the first level cache with DB? Consider the following scenario //Lets say I have created the session Session s1 = sessionFactory.getSession(); User u1 = s1.get(User.class

Spring @Async: null hibernate session on LAZY collection

阅读更多关于 Spring @Async: null hibernate session on LAZY collection

I'm using an @Async annotation on a service layer method. Everything works fine when I EAGERLY load @OneToMany collection fields, but when I try to access LAZY loaded element I found that Hibernate SessionImplementor object session is null. That obviously give me an exception: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: .... Here is my collection field: @OneToMany(mappedBy="abc", fetch=FetchType.LAZY, cascade=CascadeType.REMOVE) @OrderBy(value="xsd asc") @JsonIgnore private Set<Item> items = new HashSet<Item>(); How can I bind hibernate session

using current_session_context_class property hibernate 3 hibernate 4

阅读更多关于 using current_session_context_class property hibernate 3 hibernate 4

I have an application with Spring and Hibernate3 running well in production. Following is the config for session factory in Spring's applicationContext.xml <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="mappingDirectoryLocations"> <list> <value>classpath:/hibernate</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect </prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql"

Spring @Async: null hibernate session on LAZY collection

阅读更多关于 Spring @Async: null hibernate session on LAZY collection

问题 I'm using an @Async annotation on a service layer method. Everything works fine when I EAGERLY load @OneToMany collection fields, but when I try to access LAZY loaded element I found that Hibernate SessionImplementor object session is null. That obviously give me an exception: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: .... Here is my collection field: @OneToMany(mappedBy="abc", fetch=FetchType.LAZY, cascade=CascadeType.REMOVE) @OrderBy(value=

using current_session_context_class property hibernate 3 hibernate 4

阅读更多关于 using current_session_context_class property hibernate 3 hibernate 4

问题 I have an application with Spring and Hibernate3 running well in production. Following is the config for session factory in Spring's applicationContext.xml <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="mappingDirectoryLocations"> <list> <value>classpath:/hibernate</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate

How to flush data into db inside active spring transaction?

阅读更多关于 How to flush data into db inside active spring transaction?

I want to test hibernate session's save() method using spring testing framework. @Test method is : @Test @Transactional public void testSave() { User expected = createUser(); getGenericDao().currentSession().save(expected); User actual = getUser(generatedId); assertUsersEqual(expected,actual); } I want to flush user into database. I want my user to be in database after this method getGenericDao().currentSession().save(expected); Then I want to go to database using spring data framework and fetch this saved user by next line: User actual = getUser(generatedId); I tried to use hibernate flush

Is Hibernate's session thread safe?

阅读更多关于 Is Hibernate's session thread safe?

I need to know, whether the Hibernate's session is thread safe or not. But obvious a new session is attached to every thread for execution. But my question is if in one thread I have updated some value of an entity, so will that be reflected in other thread during same time execution? My problem is when I fire update from two threads sequentially, the value is updated properly but when I fire the update almost altogether then it fails. for eg. current stage of table. ID NAME MARKS ------- --------- -------- 1 John 54 I am trying to do follwing : Student student = session.load(Student.class, 1)

Is Hibernate's session thread safe?

阅读更多关于 Is Hibernate's session thread safe?

问题 I need to know, whether the Hibernate's session is thread safe or not. But obvious a new session is attached to every thread for execution. But my question is if in one thread I have updated some value of an entity, so will that be reflected in other thread during same time execution? My problem is when I fire update from two threads sequentially, the value is updated properly but when I fire the update almost altogether then it fails. for eg. current stage of table. ID NAME MARKS ------- ---

How to flush data into db inside active spring transaction?

阅读更多关于 How to flush data into db inside active spring transaction?

问题 I want to test hibernate session's save() method using spring testing framework. @Test method is : @Test @Transactional public void testSave() { User expected = createUser(); getGenericDao().currentSession().save(expected); User actual = getUser(generatedId); assertUsersEqual(expected,actual); } I want to flush user into database. I want my user to be in database after this method getGenericDao().currentSession().save(expected); Then I want to go to database using spring data framework and

Spring Transactions and hibernate.current_session_context_class

阅读更多关于 Spring Transactions and hibernate.current_session_context_class

I have a Spring 3.2 application that uses Hibernate 4 and Spring Transactions. All the methods were working great and I could access correctly the database to save or retrieve entities. Then, I introduced some multithreading, and since each thread was accessing to db I was getting the following error from Hibernate: org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions I read from the web that I've to add <prop key="hibernate.current_session_context_class">thread</prop> to my Hibernate configuration, but now every time I try to access the db I get: