Shulou(Shulou.com)06/02 Report--

How to carry out JPA standards and advantages of the analysis, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

Looking at the specification of JPA, as an important part of EJB 3, JPA is worth paying attention to. After reading the JPA specification, I feel that JPA is relatively single, and its goal is to achieve the versatility of Java persistence. JPA is implemented in a pure pojo way, with more Java 5 annotations. The advantage of JPA is multi-vendor support, which can be run inside or outside the container, which is its advantage.

Hibernate has been compatible with JPA since 3.2, Similarly, jdo is also beginning to be compatible with JPA. In the field of orm, it seems that JPA is already king, and the JPA specification is the specification. With the support of major manufacturers, the use of JPA has become widespread.

In Spring 2.0.1, support for JPA is officially provided, and currently supported implementations include toplink,hibernate entitymanager and openJPA. This has also contributed to the development of JPA, knowing that the advantage of JPA is that it can be run separately from the container and become more concise.

For EJB, the entity bean has always been criticized because it is too complex and huge. The emergence of JPA separates complexity to a great extent. This also makes it easy to promote ejb.

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