Hibernate在线考试系统 01
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 javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Transient;
@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";
@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;
}
}
package model;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;
@Entity
@Table(name="t_paper")
public class Paper {
private int id;
private String paperName;
private Date joinDate;
private Set<Question> questions=new HashSet<Question>();
@Id
@GeneratedValue(generator="_native")
@GenericGenerator(name="_native",strategy="native")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPaperName() {
return paperName;
}
public void setPaperName(String paperName) {
this.paperName = paperName;
}
public Date getJoinDate() {
return joinDate;
}
public void setJoinDate(Date joinDate) {
this.joinDate = joinDate;
}
@OneToMany(mappedBy="paper",fetch=FetchType.EAGER)
public Set<Question> getQuestions() {
return questions;
}
public void setQuestions(Set<Question> questions) {
this.questions = questions;
}
}
public List<Exam> getExams(Exam s_exam,PageBean pageBean)throws Exception
{
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
StringBuffer hql = new StringBuffer("from Exam exam");
if(s_exam.getStudent() != null && StringUtil.isNotEmpty(s_exam.getStudent().getId()))
{
hql.append(" and exam.student.id = '"+s_exam.getStudent().getId()+"'");
}
if(s_exam.getStudent()!=null && StringUtil.isNotEmpty(s_exam.getStudent().getName()))
{
hql.append(" and exam.student.name like '%"+s_exam.getStudent().getName()+"%'");
}
Query query=session.createQuery(hql.toString().replaceFirst("and", "where"));
if(pageBean != null)
{
query.setFirstResult(pageBean.getStart());
query.setMaxResults(pageBean.getPageSize());
}
@SuppressWarnings("unchecked")
List<Exam> examList = query.list();
session.getTransaction().commit();
return examList;
}
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 javax.persistence.Transient;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
import org.hibernate.annotations.GenericGenerator;
@Entity
@Table(name="t_question")
public class Question {
private int id;
private String subject;
private String type;
private Date joinTime;
private String optionA;
private String optionB;
private String optionC;
private String optionD;
private String answer;
private String userAnswer;
private Paper paper;
@Id
@GeneratedValue(generator="_native")
@GenericGenerator(name="_native",strategy="native")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public Date getJoinTime() {
return joinTime;
}
public void setJoinTime(Date joinTime) {
this.joinTime = joinTime;
}
public String getOptionA() {
return optionA;
}
public void setOptionA(String optionA) {
this.optionA = optionA;
}
public String getOptionB() {
return optionB;
}
public void setOptionB(String optionB) {
this.optionB = optionB;
}
public String getOptionC() {
return optionC;
}
public void setOptionC(String optionC) {
this.optionC = optionC;
}
public String getOptionD() {
return optionD;
}
public void setOptionD(String optionD) {
this.optionD = optionD;
}
@Transient
public String getUserAnswer() {
return userAnswer;
}
public void setUserAnswer(String userAnswer) {
this.userAnswer = userAnswer;
}
@ManyToOne
@Cascade(value={CascadeType.SAVE_UPDATE})
@JoinColumn(name="paperId")
public Paper getPaper() {
return paper;
}
public void setPaper(Paper paper) {
this.paper = paper;
}
public String getAnswer() {
return answer;
}
public void setAnswer(String answer) {
this.answer = answer;
}
}
控制台输出：
Hibernate: select exam0_.id as id1_0_, exam0_.examDate as examDate2_0_, exam0_.moreScore as moreScor3_0_, exam0_.paperId as paperId6_0_, exam0_.score as score4_0_, exam0_.singleScore as singleSc5_0_, exam0_.studentId as studentI7_0_ from t_exam exam0_ limit ? 首先它把exam表的信息全部查询了出来
Hibernate: select paper0_.id as id1_2_0_, paper0_.joinDate as joinDate2_2_0_, paper0_.paperName as paperNam3_2_0_, questions1_.paperId as paperId10_2_1_, questions1_.id as id1_3_1_, questions1_.id as id1_3_2_, questions1_.answer as answer2_3_2_, questions1_.joinTime as joinTime3_3_2_, questions1_.optionA as optionA4_3_2_, questions1_.optionB as optionB5_3_2_, questions1_.optionC as optionC6_3_2_, questions1_.optionD as optionD7_3_2_, questions1_.paperId as paperId10_3_2_, questions1_.subject as subject8_3_2_, questions1_.type as type9_3_2_ from t_paper paper0_ left outer join t_question questions1_ on paper0_.id=questions1_.paperId where paper0_.id=? t_paper和t_question 左关联查询
Hibernate: select student0_.id as id1_4_0_, student0_.cardNo as cardNo2_4_0_, student0_.name as name3_4_0_, student0_.password as password4_4_0_, student0_.prefession as prefessi5_4_0_, student0_.sex as sex6_4_0_ from t_student student0_ where student0_.id=? 把学生表的所有信息查询了出来