JPA ElementCollection CollectionTable覆盖示例.pdfVIP

JPA ElementCollection CollectionTable覆盖⽰例 JPA教程 - JPA ElementCollection CollectionTable覆盖⽰ 例 以下代码显⽰了如何将集合与⽬标实体映射到数据库。 // Using a targetClass instead of generics @ElementCollection(targetClass=VacationEntry .class) @CollectionTable(name=VACATI N,joinColumns=@JoinColumn(name=EMP @Attribute verride(name=daysTaken,column=@Column(name=DAYS_ABS private Collection vacationBookings = new LinkedList(); 例⼦ 以下代码来⾃Employee .j ava 。 package mon; import java.util.Collection; import java.util.HashSet; import java.util.LinkedList; import java.util.Set; import javax .persistence.Attribute verride; import javax .persistence.CollectionTable; import javax .persistence.Column; import javax .persistence.ElementCollection; import javax .persistence.Entity; import javax .persistence.GeneratedValue; import javax .persistence.GenerationType; import javax .persistence.Id; import javax .persistence.JoinColumn; @Entity public class Employee { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) private int id; private String name; // Using a targetClass instead of generics @ElementCollection(targetClass=VacationEntry .class) @CollectionTable(name=VACATI N, joinColumns=@JoinColumn(name=EMP_ID)) @Attribute verride(name=daysTaken, column=@Column(name=DAYS_ABS)) private Collection vacationBookings = new LinkedList(); // Using generics in place of a targetClass @ElementCollection @Column(name=NICKNAME) private SetString nickNames = new HashSet(); public Collection getVacationBookings() { return vacationBookings; } public void setVacationBookings(Collection vacationBookings) { this.vacationBookings = vacationBookings; } public SetString getNickNames() { return nickNames; } public void setNickNames(SetString nickNames) { this.nickNames = nickNames; } public int getId() { return