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:http://blog.csdn.net/p_3er/article/details/9061911

基于xml的多对多:http://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" class="cn.framelife.hibernate.entity.Teacher"></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;
	}
}