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javax.persistence Interface EntityManagerFactory
public interface EntityManagerFactory
应用程序使用
EntityManagerFactory 接口获取应用程序管理的实体管理器。使用实体管理器工厂完成应用程序和/或应用程序关闭时，应用程序应该关闭实体管理器工厂。关闭 EntityManagerFactory 后，它的所有实体管理器应该视为处于已关闭状态。
| since |
|
The EntityManagerFactory interface is used
by the application to obtain an application-managed entity
manager. When the application has finished using the entity
manager factory, and/or at application shutdown, the
application should close the entity manager factory.
Once an EntityManagerFactory has been closed, all its entity
managers are considered to be in the closed state.
- Since:
- Java Persistence 1.0
| Method Summary | |
|---|---|
void |
close()
Close the factory, releasing any resources that it holds. |
EntityManager |
createEntityManager()
Create a new EntityManager. |
EntityManager |
createEntityManager(Map map)
Create a new EntityManager with the specified Map of properties. |
boolean |
isOpen()
Indicates whether or not this factory is open. |
| Method Detail |
|---|
public EntityManager
createEntityManager()
创建新的 EntityManager。每次调用此方法时都返回一个新的 EntityManager 实例。isOpen 方法将对返回的实例返回 true。
英文文档：
createEntityManager
EntityManager createEntityManager()
- Create a new EntityManager.
This method returns a new EntityManager instance each time
it is invoked.
The isOpen method will return true on the returned instance.
public EntityManager
createEntityManager(java.util.Map<K, V> map)
创建带指定属性 Map 的新 EntityManager。每次调用此方法时都返回一个新的 EntityManager 实例。isOpen 方法将对返回的实例返回 true。
英文文档：
创建带指定属性 Map 的新 EntityManager。每次调用此方法时都返回一个新的 EntityManager 实例。isOpen 方法将对返回的实例返回 true。
createEntityManager
EntityManager createEntityManager(Map map)
- Create a new EntityManager with the specified Map of
properties.
This method returns a new EntityManager instance each time
it is invoked.
The isOpen method will return true on the returned instance.
public void
close()
关闭工厂，释放它占用的所有资源。关闭工厂实例之后，对其调用的所有方法都将抛出 IllegalStateException（isOpen 除外，它返回 false）。关闭 EntityManagerFactory 后，它的所有实体管理器应该视为处于已关闭状态。
英文文档：
close
void close()
- Close the factory, releasing any resources that it holds.
After a factory instance is closed, all methods invoked on
it will throw an IllegalStateException, except for isOpen,
which will return false. Once an EntityManagerFactory has
been closed, all its entity managers are considered to be
in the closed state.
public boolean
isOpen()
指示此工厂是否处于打开状态。在调用 close 之前返回 true。
英文文档：
isOpen
boolean isOpen()
- Indicates whether or not this factory is open. Returns true
until a call to close has been made.
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Copyright 2007 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.
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