student.java

有关EJB3的实体BEAN的一对多关系的实例

package OneToManyEntityBean;

import java.io.Serializable;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@SuppressWarnings("serial")
@Entity
@Table(name = "Student")
public class Student implements Serializable {

	private Integer studentid;
	private String studentName;
	private Classes classes;

	public Student() {
	}

	public Student(String studentName) {
		this.studentName = studentName;
	}

	@Id
	@GeneratedValue
	public Integer getStudentid() {
		return studentid;
	}

	public void setStudentid(Integer studentid) {
		this.studentid = studentid;
	}

	public String getStudentName() {
		return studentName;
	}

	public void setStudentName(String studentName) {
		this.studentName = studentName;
	}

	@ManyToOne(cascade = CascadeType.REFRESH, optional = false)
	@JoinColumn(name = "classesid")
	public Classes getClasses() {
		return classes;
	}

	public void setClasses(Classes classes) {
		this.classes = classes;
	}
}