我有这两个类(表)可以添加额外的字段到@ManyToMany Hibernate额外的表吗?
@Entity
@Table(name = "course")
public class Course {
@Id
@Column(name = "courseid")
private String courseId;
@Column(name = "coursename")
private String courseName;
@Column(name = "vahed")
private int vahed;
@Column(name = "coursedep")
private int dep;
@ManyToMany(fetch = FetchType.LAZY)
@JoinTable(name = "student_course", joinColumns = @JoinColumn(name = "course_id"), inverseJoinColumns = @JoinColumn(name = "student_id"))
private Set<Student> student = new HashSet<Student>();
//Some setter and getter
这一个:
@Entity
@Table(name = "student")
public class Student {
@Id
@Column(name="studid")
private String stId;
@Column(nullable = false, name="studname")
private String studName;
@Column(name="stmajor")
private String stMajor;
@Column(name="stlevel", length=3)
private String stLevel;
@Column(name="stdep")
private int stdep;
@ManyToMany(fetch = FetchType.LAZY)
@JoinTable(name = "student_course"
,joinColumns = @JoinColumn(name = "student_id")
,inverseJoinColumns = @JoinColumn(name = "course_id")
)
private Set<Course> course = new HashSet<Course>();
//Some setter and getter
这段代码运行额外的表在数据库(student_course)创建后,现在我想知道我怎么能增加额外的领域在这个表像(等级,日期和...(我的意思是student_course表)) 我看到一些解决方案,但我不喜欢他们,我也有一些问题,他们说:
您可以使用\ @OrderColumn添加一个额外的列,这是一个int列,用于存储many2many关系的排序顺序。我希望他们会添加一个\ @TempolalColumns来添加fromDate和toDate字段 – 2013-08-09 06:43:48