Learning the technology core (Learning The Technical Core of Hibernate Commotations Framework in Java Class Libraares)

Learn the technical core of the Hibernate Commons Annotations framework in the Java library Overview: Hibernate Commons Annotions is an open source Java framework that provides developers with a way to simplify Spring and Hibernate integration.It provides a series of annotations, enabling developers to easily define and manage persistent objects in the Java entity class.This article will introduce the technical core of the Hibernate Commons Annotations framework, and provide some instance code to help readers better understand and use the framework. The main features of Hibernate Commons Annotations: 1. Note driver: Hibernate Commons Annotations use annotations to configure and mapping persistent objects, so that developers can use simple annotations to define data models and persistent attributes without writing tedious XML configuration files. 2. Simplified integration: Hibernate Commons Annotations simplified the development process of the application by integrating Spring and Hibernate.It provides a strong set of annotations to manage the relationship and persistent operations between objects. 3. High scalability: Hibernate Commons Annotations can be seamlessly integrated with other Hibernate expansion frameworks, such as Hibernate Validator and Hibernate Search to achieve more functional needs. Hibernate Commons Annotations Technology Core: 1. The definition of physical class: In order to enable Hibernate Commons Annotations to manage persistence objects, we first need to use @Entity annotations on the Java entity class for labeling.This annotation tells Hibernate Commons Annotions. This class is a persistent object. import javax.persistence.Entity; import javax.persistence.Table; @Entity @Table(name = "user") public class User { // The physical class attributes and methods } 2. Properties mapping: Use @column annotations to mappore the attributes of the physical class with the columns in the database table.@Column annotation provides some attributes to define the names, length, and uniqueness of the columns. import javax.persistence.Column; @Column(name = "username", length = 100, unique = true) private String username; 3. Related relationship: Hibernate Commons Annotions provides a series of annotations to define the relationship between the physical class, such as @Onetoone, @Onetomany, @Manytoone, and @manytomany.These annotations can help developers easily define the correlation relationship with the physical class. import javax.persistence.OneToMany; @OneToMany(mappedBy = "user") private List<Address> addresses; 4. Primary key and self -increase strategy: Use @id annotation to define the primary key attribute of the physical class.You can also use the @GENTEDVALUE annotation to specify the genetic strategy of the primary key, such as self -increasing, UUID, etc. import javax.persistence.Id; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; 5. Data inspection: By using Hibernate Commons Annotations, developers can add some data verification rules to the physical class.For example, using@notnull,@min,@max,@Pattern and other annotations to verify the legitimacy of attributes. import javax.validation.constraints.NotNull; @NotNull @Column(name = "username") private String username; in conclusion: Through the introduction of this article, we learned about the technology core of the Hibernate Commons Annotations framework.By using this framework, developers can easily define and manage durable objects in the Java library, thereby simplifying the development process.I hope the content of this article can help readers better understand and use the Hibernate Commons Annotations framework. Note: The example code provided in this paper is only used to introduce the technical core of the Hibernate Commons Annotations framework. In actual use, it is necessary to adjust and expand according to specific needs.