DAO JDBC 学生成绩管理系统

1：student、course类

package JDBCU;

public class Student {
    private String no;
    private String name;
    
    public String getNo() {
        return no;
    }
    public void setNo(String no) {
        this.no = no;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
}

package JDBCU;

public class Course {
    private String no;
    private String cname;
    private float grades;
    
    public String getNo() {
        return no;
    }
    public void setNo(String no) {
        this.no = no;
    }
    public String getCname() {
        return cname;
    }
    public void setCname(String cname) {
        this.cname = cname;
    }
    public float getGrades() {
        return grades;
    }
    public void setGrades(float grades) {
        this.grades = grades;
    }
    
    
}

2 公共连接类

package JDBCU;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;


public class DatabaseConnection {
    private static final String DBDRIVER="com.mysql.jdbc.Driver";
    public static final String DBURL="jdbc:mysql://localhost:3306/stuma";
    public static final String DBNAME="root";
    public static final String DBPWD="root";
    private Connection conn;
    public DatabaseConnection(){
        try {
            Class.forName(DBDRIVER);
            this.conn=DriverManager.getConnection(DBURL,DBNAME,DBPWD);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            System.out.print("Error loading Mysql Driver!");
            e.printStackTrace();
        }
    }
    public Connection getconnection(){
        return this.conn;
    }
    public void close(){
        if(this.conn!=null){
            try {
                this.conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
}

3、接口

package JDBCU;

import java.util.List;

public interface IScoreDao {
    public  Student findstu(String no);
    public  boolean updatestu(String no,String name);
    public Course findc(String no,String cname);
    public  List<Course> findallc(String keyword);
    public boolean  addc(Course course);
    public boolean delc(String no,String cname);
    public boolean updatec(String no, String cname, float grades);
}

4、接口的实现

package JDBCU;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;



public class ISocreServiceImpl implements IScoreDao {
    private Connection conn=null;
    private PreparedStatement pstmt=null;

    
    
    public ISocreServiceImpl(Connection conn) {
        this.conn = conn;
    }



    @Override
    public Student findstu(String no) {
        Student student=null;
        String sql="select * from student where no=?";
        try {
            this.pstmt=this.conn.prepareStatement(sql);
            this.pstmt.setString(1,no);
            ResultSet rs= this.pstmt.executeQuery();
            if(rs.next()){
                student=new Student ();
                student.setNo(rs.getString(1));
                student.setName(rs.getString(2));
            }
            this.pstmt.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return student;
    }

    @Override
    public boolean updatestu(String no, String name) {
        boolean flag=false;
        String sql="update student set no=?,name=?";
        try {
            this.pstmt=this.conn.prepareStatement(sql);
            this.pstmt.setString(1,no);
            this.pstmt.setString(2, name);
            if(this.pstmt.executeUpdate()>0)
                flag=true;
                
            this.pstmt.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return flag;
    }




    @Override
    public Course findc(String no, String cname) {
        Course course=null;
        String sql="select * from course where no=? and cname=?";
        try {
            this.pstmt=this.conn.prepareStatement(sql);
            this.pstmt.setString(1,no);
            this.pstmt.setString(2,cname);
            ResultSet rs= this.pstmt.executeQuery();
            if(rs.next()){
                course=new Course ();
                course.setNo(rs.getString(1));
                course.setCname(rs.getString(2));
                course.setGrades(rs.getFloat(3));
            }
            this.pstmt.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return course;
    }



    @Override
    public List<Course> findallc(String keyword) {
        List<Course>all=new ArrayList<Course>();
        String sql="select * from course";
        try {
            this.pstmt=this.conn.prepareStatement(sql);
            ResultSet rs= this.pstmt.executeQuery();
            Course course=null;
            while(rs.next()){
                course=new Course ();
                course.setNo(rs.getString(1));
                course.setCname(rs.getString(2));
                course.setGrades(rs.getFloat(3));
                all.add(course);    
            }
            this.pstmt.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return all;
    }



    @Override
    public boolean addc(Course course) {
        boolean flag=false;
        String sql="Insert into course(no,cname,grades)values(?,?,?)";
        try{
            this.pstmt=this.conn.prepareStatement(sql);
            this.pstmt.setString(1,course.getNo());
            this.pstmt.setString(2, course.getCname());
            this.pstmt.setFloat(3, course.getGrades());
            if(this.pstmt.executeUpdate()>0)
                flag=true;
            this.pstmt.close();            
        }catch(SQLException e){
            e.printStackTrace();
        }
        return flag;
    }



    @Override
    public boolean delc(String no, String cname) {
        boolean flag=false;
        String sql="delete from course where no=? and cname=?";
        try{
            this.pstmt=this.conn.prepareStatement(sql);
            this.pstmt.setString(1,no);
            this.pstmt.setString(2,cname);
            if(this.pstmt.executeUpdate()>0)
                flag=true;
            this.pstmt.close();            
        }catch(SQLException e){
            e.printStackTrace();
        }
        return flag;
    }



    @Override
    public boolean updatec(String no, String cname, float grades) {
        boolean flag=false;

        try {
                String sql2="update course set no=?,cname=?,grades=? where no=? and cname=?";
                this.pstmt=this.conn.prepareStatement(sql2);
                this.pstmt.setString(1,no);
                this.pstmt.setString(2, cname);
                this.pstmt.setFloat(3, grades);
                this.pstmt.setString(4,no);
                this.pstmt.setString(5, cname);
                if(this.pstmt.executeUpdate()>0)
                    flag=true;
        
            this.pstmt.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return flag;
    }
}

5、回调

package JDBCU;

import java.util.List;


public class ISocreDaoImpl implements IScoreDao {

    private DatabaseConnection dbc=null;
    private ISocreServiceImpl dao=null;
    
    
    public ISocreDaoImpl() {
        this.dbc = new DatabaseConnection() ;
        this.dao = new ISocreServiceImpl(this.dbc.getconnection());
    }

    @Override
    public Student findstu(String no) {
        Student student=null;
        try {
            student=this.dao.findstu(no);
        } catch (Exception e) {
            
        }finally{
            dbc.close();
        }
        return student;
    }

    @Override
    public boolean updatestu(String no, String name) {
        boolean flag=false;
        try {
                flag=this.dao.updatestu(no,name);
        } catch (Exception e) {
            
        }finally{
            dbc.close();
        }
    return flag;
    }

    @Override
    public Course findc(String no, String cname) {
        Course course=null;
        try {
            course=this.dao.findc(no,cname);
        } catch (Exception e) {
            
        }finally{
            dbc.close();
        }
        return course;
    }

    @Override
    public List<Course> findallc(String keyword) {
        List<Course> all=null;
        try {
            all=this.dao.findallc(keyword);
        } catch (Exception e) {
            
        }finally{
            dbc.close();
        }
        return all;
    }

    @Override
    public boolean addc(Course course) {
        boolean flag=false;
        try {
            if(this.dao.findc(course.getNo(),course.getCname())==null)
                flag=this.dao.addc(course);
        } catch (Exception e) {
            
        }finally{
            dbc.close();
        }
    return flag;
    }

    @Override
    public boolean delc(String no, String cname) {
        boolean flag=false;
        try {
                flag=this.dao.delc(no,cname);
        } catch (Exception e) {
            
        }finally{
            dbc.close();
        }
    return flag;
    }

    @Override
    public boolean updatec(String no, String cname, float grades) {
        boolean flag=false;
        try {
                flag=this.dao.updatec(no,cname,grades);
        } catch (Exception e) {
            
        }finally{
            dbc.close();
        }
    return flag;
    }
    
    
}

6、测试类以及菜单

package JDBCU;


import java.util.Iterator;
import java.util.List;
import java.util.Scanner;


public class ISocreTest {
    public static void main(String[] args) {
        menu();
    }
    
    
    public static void menu() {   
        System.out.println("******************学生个人成绩管理系统***********");
        System.out.printf("
", null);
        System.out.println("              1、成绩管理");
        System.out.println("              2、学生管理");
        System.out.println("              3、退出系统");
        System.out.printf("
", null);
        System.out.println("************************************************");
        System.out.println("请输入功能编号(1-3)：");
        Scanner r0 = new Scanner(System.in);
        int i = r0.nextInt();
        switch(i){
            case 1: grademenu();                    break;
            case 2: stumenu();                break;
            case 3: 
                System.out.println("再见！");         
                break;
            default: 
                System.out.println("请输入数字1到3");
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                menu();
            break;
        }        
        r0.close();
    }
    private static void grademenu() {
        System.out.println("******************学生个人成绩系统***************");
        System.out.printf("
", null);
        System.out.println("              1、增加成绩");
        System.out.println("              2、删除成绩");
        System.out.println("              3、修改成绩");
        System.out.println("              4、显示成绩");
        System.out.println("              5、汇总成绩");
        System.out.println("              6、返回上一系统");
        System.out.printf("
", null);
        System.out.println("************************************************");
        System.out.println("请输入功能编号(1-6)：");
        Course course=new Course();
        Scanner r1 = new Scanner(System.in);
        int s = r1.nextInt();
        switch(s){
            case 1:     
                try {
                    System.out.println("请输入信息，输入格式为学号，课程名。如：201220201032 math");
                     Scanner r2 = new Scanner(System.in);
                     String s1 =r2.nextLine();
                     String[] additem=s1.split(" ");
                     if(additem.length==2){               
                         course.setNo(additem[0]);
                         course.setCname(additem[1]);        
                     }
                     System.out.println("请输入分数");
                     float s2=r1.nextFloat();
                     course.setGrades(s2);
                     new ISocreDaoImpl().addc(course);
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
                main(null);    
                break;
            case 2: 
                try {
                    System.out.println("请输入信息，输入格式为学号，课程名。如：201220201032 math");
                     Scanner r3 = new Scanner(System.in);
                     String s3 =r3.nextLine();
                     String[] additem1=s3.split(" ");
                     if(additem1.length==2){               
                         new ISocreDaoImpl().delc(additem1[0],additem1[1]);
                     }
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
                main(null);                
                break;
            case 3: 
                try {
                    System.out.println("请输入信息，输入格式为学号，课程名。如：201220201032 math");
                    Scanner r4 = new Scanner(System.in);
                     String s4 =r4.nextLine();
                     System.out.println("请输入新的分数");
                     Scanner r5 = new Scanner(System.in);
                     float s5=r5.nextFloat();
                     String[] additem2=s4.split(" ");                 
                     if(additem2.length==2){
                         if( new ISocreDaoImpl().findc(additem2[0],additem2[1])!=null)
                                 new ISocreDaoImpl().updatec(additem2[0],additem2[1],s5);
                     }
                } catch (Exception e1) {
                    e1.printStackTrace();
                }        
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                main(null);    
        
                break;
            case 4: 
                 System.out.println("请输入信息，输入格式为学号，课程名。如：201220201032 math");
                 Scanner r6 = new Scanner(System.in);
                 String s6 =r6.nextLine();
                 String[] additem3=s6.split(" ");
                 if(additem3.length==2){               
                    Course r= new ISocreDaoImpl().findc(additem3[0],additem3[1]);
                     if(r!=null){
                         System.out.println(r.getNo()+"       "+r.getCname()+"       "+r.getGrades());
                         }
                 }
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                main(null);                
                break;
            case 5: 
                List<Course> all=new  ISocreDaoImpl().findallc(" ");
                Iterator<Course> iter=all.iterator();
                while(iter.hasNext()){
                     course=iter.next();
                    System.out.println(course.getNo()+"       "+course.getCname()+"       "+course.getGrades());
                    }
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                main(null);
                break;
            case 6: menu();                            break;
            default: 
                System.out.println("请输入数字1到6");
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                stumenu();
            break;
        }
        r1.close();
    }
    private static void stumenu() {
        System.out.println("******************学生个人成绩管理系统***********");
        System.out.printf("
", null);
        System.out.println("              1、显示学生信息");
        System.out.println("              2、修改学生信息");
        System.out.println("              3、返回上一系统");
        System.out.printf("
", null);
        System.out.println("************************************************");
        System.out.println("请输入功能编号(1-3)：");
        Scanner r1 = new Scanner(System.in);
        int t = r1.nextInt();
        switch(t){
            case 1:
                System.out.println("请输入学号.如：201220201032");
                Scanner r2 = new Scanner(System.in);
                String s2=r2.nextLine();
                Student r= new ISocreDaoImpl().findstu(s2);
                 if(r!=null){
                     System.out.println(r.getNo()+"       "+r.getName());
                     }
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                main(null);
                break;
            case 2:
                try {
                    System.out.println("请输入学号.如：201220201032");
                    Scanner r3 = new Scanner(System.in);
                    String s3=r3.nextLine();
                    if( new ISocreDaoImpl().findstu(s3)!=null)
                    {
                         System.out.println("请输入信息，输入格式为学号，姓名。如：201220201032 zhang");
                         Scanner r4 = new Scanner(System.in);
                         String s4 =r4.nextLine();
                         String[] additem=s4.split(" ");
                         if(additem.length==2){               
                             new ISocreDaoImpl().updatestu(additem[0],additem[1]);
                         }
                    }
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
                //延时
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                main(null);            
                break;
            case 3: 
                menu();        
                break;
            default: 
                System.out.println("请输入数字1到3");
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                stumenu();
            break;
        }
        r1.close();
    }    


}