60
第十章 基于Annotation的关系映射 多对多
如果下面部分内容有不明白的可以查找：
基于Annotation的关系映射 前期准备:https://blog.csdn.net/p_3er/article/details/9061911
基于xml的多对多:https://blog.csdn.net/p_3er/article/details/9053415
Student:
@Entity
@Table(name = "student", catalog = "hibernate")
public class Student implements java.io.Serializable {
private Integer id;
private String SName;
private Set<Teacher> teachers;
public Student() {
}
@Id
@GeneratedValue
@Column(name = "id", unique = true, nullable = false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name = "s_name", nullable = false, length = 45)
public String getSName() {
return this.SName;
}
public void setSName(String SName) {
this.SName = SName;
}
@ManyToMany(cascade=CascadeType.ALL,targetEntity=cn.framelife.hibernate.entity.Teacher.class)
@JoinTable(name="s_t",catalog="hibernate",
joinColumns={@JoinColumn(name="student_id")},
inverseJoinColumns={@JoinColumn(name="teacher_id")}
)
/*
映射文件方式比较：
<set name="teachers" table="s_t" cascade="all">
<key column="student_id"/>
<many-to-many column="teacher_id" ></many-to-many>
</set>
*/
public Set<Teacher> getTeachers() {
return teachers;
}
public void setTeachers(Set<Teacher> teachers) {
this.teachers = teachers;
}
}
Teacher:
@Entity
@Table(name = "teacher", catalog = "hibernate")
public class Teacher implements java.io.Serializable {
private Integer id;
private String TName;
private Set<Student> students;
public Teacher() {
}
@Id
@GeneratedValue
@Column(name = "id", unique = true, nullable = false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name = "t_name", nullable = false, length = 45)
public String getTName() {
return this.TName;
}
public void setTName(String TName) {
this.TName = TName;
}
@ManyToMany(cascade=CascadeType.ALL,targetEntity=cn.framelife.hibernate.entity.Student.class)
@JoinTable(name="s_t",catalog="hibernate",
joinColumns={@JoinColumn(name="teacher_id")},
inverseJoinColumns={@JoinColumn(name="student_id")}
)
public Set<Student> getStudents() {
return students;
}
public void setStudents(Set<Student> students) {
this.students = students;
}
}
最后更新：2017-04-03 18:52:11