hibernate一对多注解

package net.zmcheng.model;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="Province")
@SuppressWarnings("serial")
public class Province implements java.io.Serializable{
private Integer id;
private String name;
private Set<City> citys = new HashSet<City>();
@OneToMany(targetEntity=City.class,cascade={CascadeType.ALL},fetch = FetchType.EAGER)
@JoinColumn(name="pro_id",updatable=false)
public Set<City> getCitys() {
return citys;
}

public void setCitys(Set<City> citys) {
this.citys = citys;
}

@Id
@GeneratedValue
public Integer getId() {
return id;
}

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

public void setName(String name) {
this.name = name;
}

}