Hibernate 一对多 的单向关系 province 中有city 集合;

package com.liyin.manytoone;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="tb_city")
public class City {
    
    private int id;
    private String name;
   // private Province province;
    
    public City(){
        
    }
    @Id
    @GeneratedValue
    @Column(name="id")
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
//    @ManyToOne
//    @JoinColumn(name="prov_id")
////    public Province getProvince() {
////        return province;
//    }
//
//    public void setProvince(Province province) {
//        this.province = province;
//    }
    
    

}

package com.liyin.manytoone;

import java.util.Set;
@Entity
@Table(name="tb_province")

public class Province {
    
    private int id;
    private String name;
    private Set<City>citys;
    
    public Province(){
        
    }
    @Id
    @GeneratedValue
    @Column(name="id")
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @OneToMany//声明一对多关系
    @JoinColumn(name="prov_id")
    public Set<City> getCitys() {
        return citys;
    }
    public void setCitys(Set<City> citys) {
        this.citys = citys;
    }
}