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This article mainly introduces how to use Hibernate Annotation, the article is very detailed, has a certain reference value, interested friends must read it!

Over the past few years, Hibernate has evolved to almost become the de facto standard for Java database persistence. It is very powerful, flexible, and has excellent performance. In this article, we will learn how to use Java 5 annotations to simplify Hibernate code and make the coding process of the persistence layer easier.

Traditionally, the configuration of Hibernate depends on external XML files: database mappings are defined as a set of XML mapping files and loaded at startup. There are many ways to create these mappings, either automatically from an existing database schema or Java class model, or manually. In any case, you will end up with a large number of Hibernate mapping files. In addition, you can use tools to generate mapping files through javadoc-style comments, although this adds one step to your build process.

In several recent releases of Hibernate, a more ingenious new approach has emerged based on Java 5 annotations. With the new Hibernate Annotation library, you can assign all the old mapping files at once-- everything is defined as you want-- annotations are embedded directly in your Java class, and provide a powerful and flexible way to declare persistent mappings. The recently released Java IDE also provides strong support for it through automatic code completion and syntax highlighting.

Hibernate Annotation also supports the new EJB 3 persistence specification. These specifications are designed to provide a standardized Java persistence mechanism. Because Hibernate 3 also provides some extensions, you can easily follow these standards and use the EJB 3 programming model to encode the Hibernate persistence layer. Now, let's get started with Hibernate Annotation.

To use Hibernate Annotation, you need at least Hibernate 3.2 and Java 5. You can download Hibernate 3.2 and the Hibernate Annotation library from the Hibernate site. In addition to the standard Hibernate JAR and dependencies, you also need Hibernate Annotations .jar files (hibernate-annotations.jar) and Java persistence API (lib/ejb3-persistence.jar). If you are using Maven, you only need to add the appropriate dependencies to the POM file, as follows:

... Org.hibernate hibernate 3.2.1.ga org.hibernate hibernate-annotations 3.2.0.ga javax.persistence persistence-api 1.0... The above is all the contents of the article "how to use Hibernate Annotation". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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