Hibernate在线考试系统 03
package model;
import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;
@Entity
@Table(name="t_exam")
public class Exam {
private int id;
private Student student;
private Paper paper;
private int singleScore;
private int moreScore;
private int score;
private Date examDate;
@Id
@GeneratedValue(generator="_native")
@GenericGenerator(name="_native",strategy="native")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@ManyToOne
@JoinColumn(name="studentId")
public Student getStudent() {
return student;
}
public void setStudent(Student student) {
this.student = student;
}
@ManyToOne
@JoinColumn(name="paperId")
public Paper getPaper() {
return paper;
}
public void setPaper(Paper paper) {
this.paper = paper;
}
public int getSingleScore() {
return singleScore;
}
public void setSingleScore(int singleScore) {
this.singleScore = singleScore;
}
public int getMoreScore() {
return moreScore;
}
public void setMoreScore(int moreScore) {
this.moreScore = moreScore;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
public Date getExamDate() {
return examDate;
}
public void setExamDate(Date examDate) {
this.examDate = examDate;
}
}
package model;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
@Entity
@Table(name="t_student")
public class Student {
private String id;
private String name;
private String password;
private String sex;
private String prefession;
private String cardNo;
private String flag="2";
private List<Exam> examList = new ArrayList<Exam>();
@Id
@Column(name="id",unique=true,nullable=false,length=40)
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Column(name="name",length=20)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(name="password",length=20)
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Column(name="sex",length=5)
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
@Column(name="prefession",length=40)
public String getPrefession() {
return prefession;
}
public void setPrefession(String prefession) {
this.prefession = prefession;
}
@Column(name="cardNo",length=50)
public String getCardNo() {
return cardNo;
}
public void setCardNo(String cardNo) {
this.cardNo = cardNo;
}
@Transient
public String getFlag() {
return flag;
}
public void setFlag(String flag) {
this.flag = flag;
}
//一对多的关系 ，级联删除
@OneToMany(mappedBy="student")
@Cascade(CascadeType.DELETE)
public List<Exam> getExamList() {
return examList;
}
public void setExamList(List<Exam> examList) {
this.examList = examList;
}
}
public void studentDelete(Student student)
{
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
session.delete(student);
session.getTransaction().commit();
}
控制台输出：
这是第一种情况 学生表没有考试成绩的信息
Hibernate: select student_.id, student_.cardNo as cardNo2_4_, student_.name as name3_4_, student_.password as password4_4_, student_.prefession as prefessi5_4_, student_.sex as sex6_4_ from t_student student_ where student_.id=? 首先查询了学生表
Hibernate: select examlist0_.studentId as studentI7_4_0_, examlist0_.id as id1_0_0_, examlist0_.id as id1_0_1_, examlist0_.examDate as examDate2_0_1_, examlist0_.moreScore as moreScor3_0_1_, examlist0_.paperId as paperId6_0_1_, examlist0_.score as score4_0_1_, examlist0_.singleScore as singleSc5_0_1_, examlist0_.studentId as studentI7_0_1_, paper1_.id as id1_2_2_, paper1_.joinDate as joinDate2_2_2_, paper1_.paperName as paperNam3_2_2_ from t_exam examlist0_ left outer join t_paper paper1_ on examlist0_.paperId=paper1_.id where examlist0_.studentId=? 其次查询学生和考试成绩表 这是学生表下面没有人有成绩
Hibernate: delete from t_student where id=?
这是第二种情况 学生表里有考试成绩的信息
Hibernate: select student_.id, student_.cardNo as cardNo2_4_, student_.name as name3_4_, student_.password as password4_4_, student_.prefession as prefessi5_4_, student_.sex as sex6_4_ from t_student student_ where student_.id=?
Hibernate: select examlist0_.studentId as studentI7_4_0_, examlist0_.id as id1_0_0_, examlist0_.id as id1_0_1_, examlist0_.examDate as examDate2_0_1_, examlist0_.moreScore as moreScor3_0_1_, examlist0_.paperId as paperId6_0_1_, examlist0_.score as score4_0_1_, examlist0_.singleScore as singleSc5_0_1_, examlist0_.studentId as studentI7_0_1_, paper1_.id as id1_2_2_, paper1_.joinDate as joinDate2_2_2_, paper1_.paperName as paperNam3_2_2_ from t_exam examlist0_ left outer join t_paper paper1_ on examlist0_.paperId=paper1_.id where examlist0_.studentId=?
Hibernate: select questions0_.paperId as paperId10_2_0_, questions0_.id as id1_3_0_, questions0_.id as id1_3_1_, questions0_.answer as answer2_3_1_, questions0_.joinTime as joinTime3_3_1_, questions0_.optionA as optionA4_3_1_, questions0_.optionB as optionB5_3_1_, questions0_.optionC as optionC6_3_1_, questions0_.optionD as optionD7_3_1_, questions0_.paperId as paperId10_3_1_, questions0_.subject as subject8_3_1_, questions0_.type as type9_3_1_ from t_question questions0_ where questions0_.paperId=?
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Hibernate: delete from t_student where id=? 再删除学生表的信息