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
    
      examList = new ArrayList
     
      ();        @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
      
        getExamList() {        return examList;    }    public void setExamList(List
       
         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=?

Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?Hibernate: delete from t_exam where id=?先删除成绩表里面的信息

Hibernate: delete from t_student where id=?再删除学生表的信息