Hibernate的注解

Hibernate的注解就是我们不要写持久化类的映射文件了，只不过要导入相应的jia包

例如：

package entity;

import java.util.HashSet;
import java.util.Set;
import java.io.Serializable;
import javax.persistence.*;

@Entity
public class District implements Serializable {
	
	private static final long serialVersionUID = 1L;
	
	@Id
	private int id;
	
	@Column(name="name")
	private String name;
	
	@OneToMany(mappedBy="district",cascade={CascadeType.ALL})
	private Set<Street> streets=new HashSet<Street>();
	public District(){
		
	}
	public District(int id,String name){
		this.id=id;
		this.name=name;
	}
	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 Set<Street> getStreets() {
		return streets;
	}
	public void setStreets(Set<Street> streets) {
		this.streets = streets;
	}
}

@Id 代表表示列 @Column(name="对应表里列名" @Persister表示不做相应映

这表示表与表之间关联

@OneToMany(mappedBy="district",cascade={CascadeType.ALL})