void lock(Object entity, LockModeType lockMode, Map<String,Object> properties) Lock an entity instance that is contained in the persistence context with the specified lock mode type and with specified properties. T merge(T entity) Merge the state of the given entity into the current persistence...
Persistence Context Duration: 1h 45m Persistence Context and Flushing Basics Action Queue The AUTO FlushModeType Dirty Checking Mechanism Bytecode Enhancement Dirty Checking Fetching Duration: 1h 45m Direct and Natural id fetching DTO projections vs Entity queries ...
An EntityManager instance is associated with a persistence context. A persistence context is a set of entity instances in which for any persistent entity identity there is a unique entity instance. Within the persistence context, the entity instances and their lifecycle are managed. The EntityManager ...
Entities are managed by the entity manager, which is represented byjavax.persistence.EntityManagerinstances. EachEntityManagerinstance is associated with a persistence context: a set of managed entity instances that exist in a particular data store. A persistence context defines the scope under which par...
Specifies whether a transaction-scoped or extended persistence context is to be used inPersistenceContext. PessimisticLockScope Defines the values of thejavax.persistence.lock.scopeproperty for pessimistic locking. SharedCacheMode Specifies how the provider must use a second-level cache for the persistence...
JPA, or Java Persistence API, is a specification for object-relational mapping in Java. It provides a way to map Java objects to database tables, making it easier to manage and persist data in your Java applications. Here’s a simple example of using JPA: ...
持久化上下文(Persist Context)就是一个受管的Entity实例的集合。 每一个持久化上下文都关联一个持久化单元,持久化上下文不可能脱离持久化单元独立存在。 持久化上下文是一个动态概念。 尽管持久化上下文非常重要,但是开发者不直接与之打交道,持久化上下文在程序中是透明的,我们通过EntityManager间接管理它。
1.SecurityContextHolder 首先来看看在spring-security-core中的SecurityContextHolder,这个是一个非常基础的对象,存储了当前应用的上下文SecurityContext,而在SecurityContext可以获取Authentication对象。也就是当前认证的相关信息会存储在Authentication对象中。 默认情况下,SecurityContextHolder是通过 ThreadLocal...
context.system.scheduler //定时器,定时触发抽奖逻辑 .schedule( 0.milliseconds, 100.milliseconds, new Runnable { def run = { self ! "doLottery" } } ) override def receiveCommand: Receive = { case lc: LotteryCmd => lotteryQueue = lotteryQueue :+ (lc, sender()) //参与信息加入抽奖队列 ...
context.unitName() : null; if (StringUtils.isEmpty(persistenceUnitName)) persistenceUnitName = null; return persistenceUnitName; } 代码示例来源:origin: org.apache.tapestry/tapestry-jpa public static EntityManager getEntityManager(EntityManagerManager entityManagerManager, PersistenceContext annotation) { Strin...