hibernate--注解开发

约定不等于承诺〃 2024-02-18 14:43 28阅读 0赞

hibernate注解开发所需要的jar包：  
(1)hibernate-annotations.jar  
(2)hibernate-commons-annotations.jar  
(3)ejb3-persistence.jar

奇怪的是当我换成myeclipse自带的hibernate的jar包时，没有hibernate-annotations.jar和ejb3-persistence.jar也可以。

![Center][]相关的所有hibernate的jar包

实体类：

package com.bean;
    
    import javax.persistence.Entity;
    import javax.persistence.Id;
    
    @Entity
    public class Student {
    	private int id;
    	private String name;
    	private String password;
    @Id
    	public int getId() {
    		return id;
    	}
    
    	public void setId(int id) {
    		this.id = id;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public String getPassword() {
    		return password;
    	}
    
    	public void setPassword(String password) {
    		this.password = password;
    	}
    
    }

有了@Id即可完成所有属性的映射

辅助类Ancillery.java：

package com.action;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.cfg.AnnotationConfiguration;
    import org.hibernate.cfg.Configuration;
    import org.hibernate.service.ServiceRegistryBuilder;
    
    public class Ancillary {
        private static final SessionFactory sessionFactory = buildSessionFactory();
    
        private static SessionFactory buildSessionFactory() {
            try {
                // Create the SessionFactory from hibernate.cfg.xml
                return new Configuration().configure().buildSessionFactory();
            }
            catch (Throwable ex) {
                // Make sure you log the exception, as it might be swallowed
                System.err.println("Initial SessionFactory creation failed." + ex);
                throw new ExceptionInInitializerError(ex);
            }
        }
    
        public static SessionFactory getSessionFactory() {
            return sessionFactory;
        }
    }

测试类：

package com.action;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.cfg.Configuration;
    import org.hibernate.service.ServiceRegistryBuilder;
    
    import com.bean.Student;
    
    public class test2 {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
           Session session = Ancillary.getSessionFactory().openSession();
           
           Student student = new Student();
           student.setId(4);
           student.setName("周五");
           student.setPassword("123456");
           
           session.beginTransaction();
           session.save(student);
           session.getTransaction().commit();
           session.close();
    	}
    }

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/1e6aeed483f94798aa599147832698f5.png