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<class name="com.bjsxt.hibernate.Student" table="student" schema="a">
<id name="id" type="integer">
<generator class="native"></generator>
</id>
<property name="name" type="string"></property>
<set name="teachers" table="teacher_student" cascade="all">
<key column="students_id"></key>
<many-to-many class="com.bjsxt.hibernate.Teacher" column="teachers_id"></many-to-many>
</set>
</class>
<hibernate-mapping>
<class name="com.bjsxt.hibernate.Teacher" table="teacher" schema="a">
<id name="id" type="integer">
<generator class="native"></generator>
</id>
<property name="name" type="string"></property>
<set name="students" table="teacher_student" cascade="all">
<key column="teachers_id"></key>
<many-to-many class="com.bjsxt.hibernate.Student"
column="students_id" />
</set>
</class>
</hibernate-mapping>
@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "students", targetEntity = Teacher.class)
public Set<Teacher> getTeachers() {
return this.teachers;
}
@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinTable(name = "teacher_student", catalog = "a", joinColumns = { @JoinColumn(name = "teachers_id", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "students_id", nullable = false, updatable = false) })
public Set<Student> getStudents() {
return this.students;
}
//关系集合
@ManyToMany(targetEntity=Subject.class)
@JoinTable(name="STUDENT_SUBJECT",
joinColumns=@JoinColumn(name="STUDENT_ID",referencedColumnName="ID"),
inverseJoinColumns=@JoinColumn(name="SUBJECT_ID",referencedColumnName="ID"))
private Set subjects;
//关系集合
@ManyToMany(targetEntity=Student.class)
@JoinTable(name="STUDENT_SUBJECT",
joinColumns=@JoinColumn(name="SUBJECT_ID",referencedColumnName="ID"),
inverseJoinColumns=@JoinColumn(name="STUDENT_ID",referencedColumnName="ID"))
private Set students;
//关系集合
@ManyToMany(targetEntity=Student.class)
@JoinTable(name="STUDENT_SUBJECT",
joinColumns=@JoinColumn(name="SUBJECT_ID",referencedColumnName="ID"),
inverseJoinColumns=@JoinColumn(name="STUDENT_ID",referencedColumnName="ID"))
private Set students;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
@Entity
public class Student {
private Integer id;
private String name;
private Set<Teacher> teachers = new HashSet<Teacher>();
public Student(){}
public Student(String name) {
this.name = name;
}
@Id @GeneratedValue
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(length=10,nullable=false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany(cascade=CascadeType.REFRESH,fetch=FetchType.LAZY)
@JoinTable(name="student_teacher",
inverseJoinColumns=@JoinColumn(name="teacher_id"),
joinColumns=@JoinColumn(name="student_id"))
public Set<Teacher> getTeachers() {
return teachers;
}
public void setTeachers(Set<Teacher> teachers) {
this.teachers = teachers;
}
public void addTeacher(Teacher teacher){
this.teachers.add(teacher);
}
public void remoceTeacher(Teacher teacher){
if(this.teachers.contains(teacher))
this.teachers.remove(teacher);
}
}
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
@Entity
public class Teacher {
private Integer id;
private String name;
private Set<Student> students = new HashSet<Student>();
public Teacher(){}
public Teacher(String name) {
this.name = name;
}
@Id
@GeneratedValue
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(length = 10, nullable = false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany(cascade = CascadeType.REFRESH, fetch = FetchType.LAZY, mappedBy = "teachers")
public Set<Student> getStudents() {
return students;
}
public void setStudents(Set<Student> students) {
this.students = students;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Teacher other = (Teacher) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
}