LocalContainerEntityManagerFactoryBean和LocalEntityManagerFactoryBean有什么区别？

问题描述

任何人都可以解释Spring框架的 LocalContainerEntityManagerFactoryBean 和 LocalEntityManagerFactoryBean 之间的区别是什么？

解决方案

基本上， JPA规范定义了 两种类型的实体管理器 。它们是：
i）应用程序管理：应用程序管理实体管理器意味着实体管理器仅由应用程序（即我们的代码）创建和管理 。 ii）容器管理：容器管理实体管理器意味着实体管理器仅由J2EE容器创建和管理（即我们的代码不会执行） t直接管理，而不是实体管理器由容器创建和管理，我们的代码通过某种方式像使用JNDI一样获得EM。）注意：Created and Managed（above）表示打开，关闭和涉及实体管理器在事务中
$ b LocalContainerEntityManagerFactoryBean - 容器管理
LocalEntityManagerFactoryBean - 管理应用程序

大注意： 对于基于spring的应用程序， （em> LocalContainerEntityManagerFactoryBean 和 application ） 您配置 LocalEntityManagerFactoryBean ）

Can anybody explain what is the difference between the Spring Framework's LocalContainerEntityManagerFactoryBean and LocalEntityManagerFactoryBean?

解决方案

Basically JPA specification defines two types of entity managers. They are :

i) Application-Managed : Application Managed entity manager means "Entity Managers are created and managed by merely the application ( i.e. our code )" .

ii) Container Managed : Container Managed entity manager means "Entity Managers are created and managed by merely the J2EE container ( i.e. our code doesn't directly manages instead entity managers are created and managed by container , and our codes gets EM's through some way like using JNDI ).

Note : Created and Managed (above) means "opening , closing and involving entity manager in transactions"

LocalContainerEntityManagerFactoryBean - container managed
LocalEntityManagerFactoryBean - application managed

A Big Note : For spring based applications, the difference is not much. Spring only plays roles ( as container if you configure LocalContainerEntityManagerFactoryBean and as application if you configure LocalEntityManagerFactoryBean)

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