Spring 多对对实体
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package com.wangshenghua.entity; import java.io.Serializable; import java.util.Set; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax.persistence.ManyToMany; import javax.persistence.Table; @Entity @Table(name = "course") public class Course implements Serializable private static final long serialVersionUID = 5844590076435775458L; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; private String name;
/**
* 一个学生对应多门功课<br>
* 多对多时,使用中间表关联两者关系<br>
*/
@ManyToMany(cascade = CascadeType.ALL) @JoinTable(name = "student_has_course", joinColumns = @JoinColumn(name = "course_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "student_id", referencedColumnName = "id")) private Set<Student> students; // @JoinTable里的 name 中间表 // joinColumns 当前实体ID // inverseJoinColumns对方实体ID public Course() public Course(String name) super(); this.name = name; public int getId() return id; public void setId(int id) this.id = id; public String getName() return name; public void setName(String name) this.name = name; public Set<Student> getStudents() return students; public void setStudents(Set<Student> students) this.students = students; @Override public String toString() return "Course [id=" + id + ", name=" + name + ", students=" + students + "]";
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