Hibernate 注解配置实体类

柔情只为你懂 2024-02-17 17:08 49阅读 0赞

**一、注解配置实体类**

**![Center][]**

**(1)写具体的实体类**

import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.NamedQuery;
    import javax.persistence.SequenceGenerator;
    import javax.persistence.Table;
    import javax.persistence.Transient;
    
    @Entity    //持久化类
    @Table(name="my_student")  //指定数据库表名
    @NamedQuery(name="stu" ,query="from Student")  //HQL
    public class Student {
    	@Id     //PK
    //	@GeneratedValue //序列化  hibernate自动序列 +1
    //	@GeneratedValue(strategy=GenerationType.AUTO)   // hibernate自动序列 +1
    //	@GeneratedValue(strategy=GenerationType.SEQUENCE) // *10,+10
    	
    	//使用自定义的序列化my_sid
    	@SequenceGenerator(name="qq",sequenceName="my_sid")
    	@GeneratedValue(generator="qq")
    	private int id;
    	
    	@Column(name="sname")   //对应的列名
    	private String name;
    	
    	private int age;
    	
    	@Transient   //不写入到数据表中
    	private String address;
    
    	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 int getAge() {
    		return age;
    	}
    
    	public void setAge(int age) {
    		this.age = age;
    	}
    
    	public String getAddress() {
    		return address;
    	}
    
    	public void setAddress(String address) {
    		this.address = address;
    	}
    
    	public Student(int id, String name, int age, String address) {
    		super();
    		this.id = id;
    		this.name = name;
    		this.age = age;
    		this.address = address;
    	}
    
    	public Student() {
    		super();
    	}
    
    	public Student(int id, String name, int age) {
    		super();
    		this.id = id;
    		this.name = name;
    		this.age = age;
    	}
    
    	public Student(String name, int age) {
    		super();
    		this.name = name;
    		this.age = age;<pre name="code" class="java">

**(2)在hibernate.cfg.xml中配置注解类**

**(3)在hibernate.cfg.xml中配置创建表**

<property name="hbm2ddl.auto">update</property>

**(3)测试类**

@Test
    	public void test1() {
    		Session session = HibernateUtil.currentSession();
    		Transaction tx = session.beginTransaction();
    
    		try {
    //			Student student = new Student(1000, "香菱", 21, "HZ");
    			
    			//配置序列化
    //			Student student = new Student("郑书磊", 23);
    			
    //			Student student = new Student("mike", 21);
    			
    			Student student = new Student("xx", 22);
    
    			session.save(student);
    			tx.commit();
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    
    			tx.rollback();
    		} finally {
    			HibernateUtil.closeSession();
    		}
    
    	}
    
    
    	}

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/839ebdab72a94b8daa3b293256ec2253.png