oneToMany 使用：
示例：Employee与Phone为例.
1、类定义如下：
package com.vrvwh.wh01.domain; import javax.persistence.*;
import java.util.HashSet;
import java.util.Set; /**
* Created by Administrator on 2015/3/5.
*/
@Entity
public class Employee {
private long id; private String name; private Set<Phone> phones=new HashSet<Phone>(); @Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public long getId() {
return id;
} public void setId(long id) {
this.id = id;
} @Column
public String getName() {
return name;
} public void setName(String name) {
this.name = name;
}
/**orphanRemoval=true配置表明删除无关联的数据。级联更新子结果集时此配置最关键
*/
@OneToMany(mappedBy = "employee",cascade = CascadeType.ALL,orphanRemoval = true)
public Set<Phone> getPhones() {
return phones;
} public void setPhones(Set<Phone> phones) {
this.phones = phones;
}
}
package com.vrvwh.wh01.domain; import javax.persistence.*; /**
* Created by Administrator on 2015/3/5.
*/
@Entity(name="Phones")
public class Phone {
@Id
private int phoneId;
private int phoneNumber; @ManyToOne(cascade= CascadeType.ALL)
private Employee employee; public int getPhoneId() {
return phoneId;
}
public void setPhoneId(int phoneId) {
this.phoneId = phoneId;
}
public int getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(int phoneNumber) {
this.phoneNumber = phoneNumber;
}
public Employee getEmployee() {
return employee;
}
public void setEmployee(Employee employee) {
this.employee = employee;
} }
2、更新:
Employee employee=employeeService.query(1);
employee.getPhones().clear();
Phone phone1=new Phone();
phone1.setPhoneNumber(132567);
employee.getPhones().add(phone1);
Phone phone2=new Phone();
phone2.setPhoneNumber(132567);
employee.getPhones().add(phone2);
employeeService.update(employee);