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  • hibernate实现学生-课程-成绩

    1.实体类Student

    package com.test.model;
    
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    
    @Entity
    public class Student {
        private int id;
        private String name;
        
        @Id
        @GeneratedValue
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
    }
    View Code

    2.实体类Course

    package com.test.model;
    
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    
    @Entity
    public class Course {
        private int id;
        private String name;
        
        @Id
        @GeneratedValue
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
    }
    View Code

    3.实体类

    package com.test.model;
    
    import javax.persistence.CascadeType;
    import javax.persistence.Entity;
    import javax.persistence.FetchType;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.JoinColumn;
    import javax.persistence.ManyToOne;
    
    @Entity
    public class Score {
        private int id;
        private int score;
        private Student student;
        private Course course;
        
        @Id
        @GeneratedValue
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public int getScore() {
            return score;
        }
        public void setScore(int score) {
            this.score = score;
        }
        @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
        @JoinColumn(name="StudentId")
        public Student getStudent() {
            return student;
        }
        public void setStudent(Student student) {
            this.student = student;
        }
        
        @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
        @JoinColumn(name="CourseId")
        public Course getCourse() {
            return course;
        }
        public void setCourse(Course course) {
            this.course = course;
        }
    }
    View Code

    4.测试类

    package com.test.test;
    
    import org.hibernate.classic.Session;
    
    import com.test.Util.HibernateUtil;
    import com.test.model.Course;
    import com.test.model.Score;
    import com.test.model.Student;
    
    public class StudentManager {
        public static void main(String[] args) {
            new StudentManager().testSave();
        }
        
        public void testSave() {
            Session session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();
            
            Student s = new Student();
            s.setName("张三");
            Course c = new Course();
            c.setName("语文");
            Score sc = new Score();
            sc.setScore(80);
            sc.setStudent(s);
            sc.setCourse(c);
            
            Student s1 = new Student();
            s1.setName("李四");
            Course c1 = new Course();
            c1.setName("数学");
            Score sc1 = new Score();
            sc1.setScore(90);
            sc1.setStudent(s1);
            sc1.setCourse(c1);
            
            Student s2 = new Student();
            s2.setName("王五");
            Score sc2 = new Score();
            sc2.setScore(70);
            sc2.setStudent(s2);
            sc2.setCourse(c1);
            
            session.save(sc);
            session.save(sc1);
            session.save(sc2);
            session.getTransaction().commit();
        }
    }    
    View Code
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  • 原文地址:https://www.cnblogs.com/redhat0019/p/8482075.html
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