JPA oneToMany 级联更新
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);
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