学生成绩管理系统课程设计

  • 需求分析
    • E-R图
      • 逻辑关系
    • 物理设计和实施
      • 创建包、Add、Del、Update、Sel
  • idea链接数据库
    • 简单SQL语句
      • 答辩

需求分析

1 信息需求
对学校而言，学生成绩管理是管理工作中重要的一环，但是高校学生的成绩管理工作量大、繁杂，人工处理非常困难。因此，借助于强大计算机的处理能力，能够把人从繁重的成绩管理工作中解脱出来，并且更加准确、安全、清晰的管理环境。

2 功能需求
能够进行数据库的数据定义、数据操纵、数据控制等处理功能。具体功能应包括：可提供课程安排、课程成绩数据的添加、插入、删除、更新、查询，学生及教职工基本信息查询的功能。

3 安全性与完整性要求
对于学生成绩管理系统数据库来讲，由于其主要数据是学生成绩，只能由本人以及所教老师及教务处知道，因此做好数据安全性是重中之重。另外，要求所有在校学生的信息都要录入其中，并且要设计好个别情况。

E-R图

一位学生会被多位老师教导，一位老师会教导多位学生，所有学生与教师之间是多对多（m:n）的关系；
一位学生可能会选修多门课程，一门课程会被多位学生选修，所以学生与课程之间是多对多（m:n）的关系；
一位学生会有多项成绩（具体指某学生一门课程的分数），一项成绩仅被一位学生拥有，所以学生与成绩是一对多（1:n）的关系；
一位教师会讲授多门课程，一门课程会被一位教师讲授，所以教师与课程的关系是一对多（1:n）的关系；
一门课程拥有多项成绩，一项成绩仅被一门课程拥有，所以课程与成绩的关系是一对多（1:n）的关系；
学生（学号、姓名、班级、性别、专业、出生日期、学分）；
老师（教师编号、姓名、学院）；
课程（课程编号、教师编号、课程名称、课程学分）；
成绩（学号、课程编号、分数）；

逻辑关系

根据题目要求可以简化成三个表：

1.student 表：学号（sno）、姓名（sname）、性别（ssex）、专业（sdept），此为联系“student表”所对应的关系模式，学号为该关系的候选码，满足第三范式。

2.course表：课程编号（cno）、教师（cteacher）、课程名称（cname）、先修课课程号(cpno)、学分（ccredit），此为联系“course表”所对应的关系模式，课程编号和教师编号为该关系的候选码，满足第三范式。

3.sc表：学号（sno）、课程编号（cno）、分数（grade），此为联系“sc表”所对应的关系模式，学号和课程编号为该关系的候选码，满足第三范式。

物理设计和实施

创建course表
属性依次为：课程号、课程名、先修课课程号、学分、教师
主键为课程号

创建student表
属性依次为：学号、姓名、性别、年龄、所在系系名
主键为学号

sdept char(15) null勾选

注意学号不要写重复，会报错

创建sc表，表示选课关系
属性依次为学号、课程号、分数
主键为学号、课程号


数据库链接到idea

idea没有database的下载：
File+settings+editor+plugins+database navigator+apply+ok
出现感叹号：进connection+properties+serverTimezone+Asia/Shanghai+test connection

创建包、Add、Del、Update、Sel

主代码再最后面

AddC

/*
AddC
*/
package sc;
import java.awt.*;
import javax.swing.*;
import java.sql.*;
import java.awt.event.*;public class AddC extends JPanel implements ActionListener{JTextField 课程号,课程名,先修课课程号,学分;JButton 录入;public AddC(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}课程号=new JTextField(12);课程名=new JTextField(12);先修课课程号=new JTextField(12);学分=new JTextField(12);录入=new JButton("录入");录入.addActionListener(this);Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();Box box6=Box.createHorizontalBox();box1.add(new JLabel("课程号:"));box1.add(课程号);box2.add(new JLabel("课程名:"));box2.add(课程名);box3.add(new JLabel("先修课课程号:"));box3.add(先修课课程号);box4.add(new JLabel("学分:"));box4.add(学分);box6.add(录入);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(box5);boxH.add(box6);boxH.add(Box.createVerticalGlue());JPanel messPanel=new JPanel();messPanel.add(boxH);setLayout(new BorderLayout());add(messPanel,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent c){Object obj=c.getSource();if(obj==录入){if(课程号.getText().equals("")||课程名.getText().equals("")||先修课课程号.getText().equals("")||学分.getText().equals("")){JOptionPane.showMessageDialog(this,"学生信息请填满再录入！" );}Statement stmt=null;ResultSet rs=null,rs1=null;String sql,sql1;sql1="select * from Course where Cno='"+课程号.getText()+"'";sql="insert into Course values('"+课程号.getText()+"','"+课程名.getText()+"','"+先修课课程号.getText()+"','"+学分.getText()+"')";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){JOptionPane.showMessageDialog(this,"该课号以存在，无法添加");}else{stmt.executeUpdate(sql);JOptionPane.showMessageDialog(this,"添加成功");}rs1.close();stmt.close();}catch(SQLException e){System.out.print("SQL Exception occur.Message is:"+e.getMessage());}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

AddS

/*
AddS
*/
package sc;
import java.awt.*;
import javax.swing.*;
import java.sql.*;
import java.awt.event.*;public  class AddS extends JPanel implements ActionListener{JTextField 学号,姓名,性别,年龄,所在系系名;JButton 录入;public AddS(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}学号=new JTextField(12);姓名=new JTextField(12);性别=new JTextField(12);年龄=new JTextField(12);所在系系名=new JTextField(12);录入=new JButton("录入");录入.addActionListener(this);Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();Box box6=Box.createHorizontalBox();box1.add(new JLabel("学号:"/*,JLabel.CENTER*/));box1.add(学号);box2.add(new JLabel("姓名:"/*,JLabel.CENTER*/));box2.add(姓名);box3.add(new JLabel("性别:"/*,JLabel.CENTER*/));box3.add(性别);box4.add(new JLabel("年龄:"/*,JLabel.CENTER*/));box4.add(年龄);box5.add(new JLabel("所在系系名:"/*,JLabel.CENTER*/));box5.add(所在系系名);box6.add(录入);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(box5);boxH.add(box6);boxH.add(Box.createVerticalGlue());JPanel messPanel=new JPanel();messPanel.add(boxH);setLayout(new BorderLayout());add(messPanel,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent c){Object obj=c.getSource();if(obj==录入){if(学号.getText().equals("")||姓名.getText().equals("")||性别.getText().equals("")||年龄.getText().equals("")||所在系系名.getText().equals("")){JOptionPane.showMessageDialog(this,"学生信息请填满再录入！" );}Statement stmt=null;ResultSet rs1=null;String sql,sql1;sql1="select * from Student where Sno='"+学号.getText()+"'";sql="insert into Student values('"+学号.getText()+"','"+姓名.getText()+"','"+性别.getText()+"','"+年龄.getText()+"','"+所在系系名.getText()+"')";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){JOptionPane.showMessageDialog(this,"该学号已经存在，无法添加");}else{stmt.executeUpdate(sql);JOptionPane.showMessageDialog(this,"添加成功");}rs1.close();stmt.close();}catch(SQLException e){System.out.print("SQL Exception occur.Message is:"+e.getMessage());}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

AddSC

/*
AddSC
*/
package sc;import java.awt.*;import javax.swing.*;import java.sql.*;
import java.util.*;
import javax.swing.filechooser.*;
import java.io.*;
import java.awt.event.*;public class AddSC extends JPanel implements ActionListener{JTextField 课程号,学号,成绩;JButton 录入;public AddSC(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}课程号=new JTextField(12);学号=new JTextField(12);成绩=new JTextField(12);录入=new JButton("录入");录入.addActionListener(this);Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();box1.add(new JLabel("课号:"));box1.add(课程号);box2.add(new JLabel("学号:"));box2.add(学号);box3.add(new JLabel("成绩:"));box3.add(成绩);box4.add(录入);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(Box.createVerticalGlue());JPanel messPanel=new JPanel();messPanel.add(boxH);setLayout(new BorderLayout());add(messPanel,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent c){Object obj=c.getSource();if(obj==录入){if(课程号.getText().equals("")||学号.getText().equals("")){JOptionPane.showMessageDialog(this,"填写课号与学号才能录入！" );}else{Statement stmt=null;ResultSet rs=null,rs1=null,rsC=null,rsS=null;String sql,sql1,sqlS,sqlC;sqlC="select * from Course where Cno='"+课程号.getText()+"'";sqlS="select * from Student where Sno='"+学号.getText()+"'";sql1="select * from SC where Cno='"+课程号.getText()+"' and Sno='"+学号.getText()+"'";sql="insert into SC values('"+学号.getText()+"','"+课程号.getText()+"','"+成绩.getText()+"')";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rsC=stmt.executeQuery(sqlC);if(rsC.next()){rsS=stmt.executeQuery(sqlS);if(rsS.next()){rs1=stmt.executeQuery(sql1);if(rs1.next()){JOptionPane.showMessageDialog(this,"该学生以选该课程号，无法添加");}else{stmt.executeUpdate(sql);JOptionPane.showMessageDialog(this,"添加成功");}rs1.close();}else{JOptionPane.showMessageDialog(this,"该学生不存在，无法添加");}rsS.close();}else{JOptionPane.showMessageDialog(this,"该课程不存在，无法添加");}rsC.close();stmt.close();}catch(SQLException e){System.out.print("SQL Exception occur.Message is:"+e.getMessage());}}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

DelC

/*
DelC
*/
package sc;import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
public class DelC extends JPanel implements ActionListener{String save=null;JTextField 课号1,课程号,课程名,先修课课程号,学分;JButton 删除,查找;public DelC(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}课号1=new JTextField(12);课程号=new JTextField(12);课程名=new JTextField(12);先修课课程号=new JTextField(12);学分=new JTextField(12);删除=new JButton("删除");查找=new JButton("查找");Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();Box box6=Box.createHorizontalBox();Box box7=Box.createHorizontalBox();box1.add(new JLabel("课程号:",JLabel.CENTER));box1.add(课程号);box2.add(new JLabel("课程名:",JLabel.CENTER));box2.add(课程名);box3.add(new JLabel("先修课课程号:",JLabel.CENTER));box3.add(先修课课程号);box4.add(new JLabel("学分:",JLabel.CENTER));box4.add(学分);box6.add(删除);box7.add(new JLabel("课号:",JLabel.CENTER));box7.add(课号1);box7.add(查找);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(box5);boxH.add(box6);//boxH.add(box7);boxH.add(Box.createVerticalGlue());删除.addActionListener(this);查找.addActionListener(this);JPanel picPanel=new JPanel();JPanel messPanel=new JPanel();messPanel.add(box7);picPanel.add(boxH);setLayout(new BorderLayout());JSplitPane splitV=new JSplitPane(JSplitPane.VERTICAL_SPLIT,messPanel,picPanel);//分割add(splitV,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent e){Object obj=e.getSource();Statement stmt=null;ResultSet rs=null,rs1=null;String sql=null,sql1=null,sqlSC=null;if(obj==查找){if(课号1.getText().equals(""))JOptionPane.showMessageDialog(this,"请填写查询的课号！" );else{sql1="select * from Course where Cno='"+课号1.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){课程号.setText(rs1.getString("Cno").trim());课程名.setText(rs1.getString("Cname").trim());先修课课程号.setText(rs1.getString("Cpno").trim());学分.setText(rs1.getString("Ccredit").trim());save=课号1.getText().trim();}else{JOptionPane.showMessageDialog(this,"没有这个课号的课程" );}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}else{if(obj==删除){if(save==null)JOptionPane.showMessageDialog(this,"还没查找需要修改的课程" );else{sql="delete from Course where Cno='"+save+"'";sqlSC="delete from SC where Cno='"+save+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);stmt.executeUpdate(sql);stmt.executeUpdate(sqlSC);save=null;JOptionPane.showMessageDialog(this,"删除完成" );课程号.setText("");课程名.setText("");先修课课程号.setText("");学分.setText("");stmt.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}}}//    连接数据库方法public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

DelS

/*
DelS
*/
package sc;import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;public class DelS extends JPanel implements ActionListener{String save=null;JTextField 学号1,学号,姓名,性别,年龄,所在系系名;JButton 删除,查找;public DelS(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}学号1=new JTextField(12);学号=new JTextField(12);姓名=new JTextField(12);性别=new JTextField(12);年龄=new JTextField(12);所在系系名=new JTextField(12);删除=new JButton("删除");查找=new JButton("查找");Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();Box box6=Box.createHorizontalBox();Box box7=Box.createHorizontalBox();box1.add(new JLabel("学号:",JLabel.CENTER));box1.add(学号);box2.add(new JLabel("姓名:",JLabel.CENTER));box2.add(姓名);box3.add(new JLabel("性别:",JLabel.CENTER));box3.add(性别);box4.add(new JLabel("年龄:",JLabel.CENTER));box4.add(年龄);box5.add(new JLabel("所在系系名:",JLabel.CENTER));box5.add(所在系系名);box6.add(删除);box7.add(new JLabel("学号:",JLabel.CENTER));box7.add(学号1);box7.add(查找);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(box5);boxH.add(box6);boxH.add(Box.createVerticalGlue());删除.addActionListener(this);查找.addActionListener(this);JPanel picPanel=new JPanel();JPanel messPanel=new JPanel();messPanel.add(box7);picPanel.add(boxH);setLayout(new BorderLayout());JSplitPane splitV=new JSplitPane(JSplitPane.VERTICAL_SPLIT,messPanel,picPanel);//分割add(splitV,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent e){Object obj=e.getSource();Statement stmt=null;ResultSet rs=null,rs1=null;String sql=null,sql1=null,sqlSC=null;if(obj==查找){if(学号1.getText().equals(""))JOptionPane.showMessageDialog(this,"请填写查询的学号！" );else{sql1="select * from Student where Sno='"+学号1.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){学号.setText(rs1.getString("Sno").trim());姓名.setText(rs1.getString("Sname").trim());性别.setText(rs1.getString("Ssex").trim());年龄.setText(rs1.getString("Sage").trim());所在系系名.setText(rs1.getString("Sdept").trim());save=学号1.getText().trim();}else{JOptionPane.showMessageDialog(this,"没有这个学号的学生" );}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}else{if(obj==删除){if(save==null)JOptionPane.showMessageDialog(this,"还没查找需要修改的学生" );else{sql="delete from Student where Sno='"+save+"'";sqlSC="delete from SC where Sno='"+save+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);stmt.executeUpdate(sql);stmt.executeUpdate(sqlSC);save=null;JOptionPane.showMessageDialog(this,"删除完成" );学号.setText("");姓名.setText("");性别.setText("");年龄.setText("");所在系系名.setText("");stmt.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

DelSC

/*
DelSC
*/
package sc;import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;public class DelSC extends JPanel implements ActionListener{String saveC=null;String saveS=null;JTextField 课号1,学号1,学号,课程号,成绩;JButton 删除,查找;public DelSC(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}学号1=new JTextField(12);课号1=new JTextField(12);课程号=new JTextField(12);学号=new JTextField(12);成绩=new JTextField(12);删除=new JButton("删除");查找=new JButton("查找");Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();box1.add(new JLabel("课程号:",JLabel.CENTER));box1.add(课程号);box2.add(new JLabel("学号:",JLabel.CENTER));box2.add(学号);box3.add(new JLabel("成绩:",JLabel.CENTER));box3.add(成绩);box4.add(删除);box5.add(new JLabel("课号:",JLabel.CENTER));box5.add(课号1);box5.add(new JLabel("学号:",JLabel.CENTER));box5.add(学号1);box5.add(查找);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(Box.createVerticalGlue());删除.addActionListener(this);查找.addActionListener(this);JPanel picPanel=new JPanel();JPanel messPanel=new JPanel();messPanel.add(box5);picPanel.add(boxH);setLayout(new BorderLayout());JSplitPane splitV=new JSplitPane(JSplitPane.VERTICAL_SPLIT,messPanel,picPanel);//分割add(splitV,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent e){Object obj=e.getSource();Statement stmt=null;ResultSet rs=null,rs1=null;String sql=null,sql1=null;if(obj==查找){if(课号1.getText().equals("")||学号1.getText().equals(""))JOptionPane.showMessageDialog(this,"请填写完成查询的信息！" );else{sql1="select * from SC where Cno='"+课号1.getText()+"' and Sno='"+学号1.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){课程号.setText(rs1.getString("Cno").trim());学号.setText(rs1.getString("Sno").trim());成绩.setText(rs1.getString("grade").trim());saveC=课号1.getText().trim();saveS=学号1.getText().trim();}else{JOptionPane.showMessageDialog(this,"没有这个课号的学生" );}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}else{if(obj==删除){if(saveC==null||saveS==null)JOptionPane.showMessageDialog(this,"还没查找需要修改的学生/课程" );else{sql="delete from SC where Cno='"+saveC+"' and Sno='"+saveS+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);stmt.executeUpdate(sql);saveC=null;saveS=null;JOptionPane.showMessageDialog(this,"删除完成" );课程号.setText("");学号.setText("");成绩.setText("");stmt.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

SelC

/*
SelC
*/
package sc;
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;import java.util.*;public class SelC extends JFrame {Vector rowData, columnNames;Statement stmt=null;String sql=null;JTable jt = null;JScrollPane jsp = null;PreparedStatement ps=null;ResultSet rs=null;public SelC(String sql1){columnNames = new Vector();// 设置列名columnNames.add("课程号");columnNames.add("课程名");columnNames.add("先修课课程号");columnNames.add("学分");rowData=new Vector();sql=sql1;try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs=stmt.executeQuery(sql);while(rs.next()){Vector hang = new Vector();hang.add(rs.getString("Cno"));System.out.print(rs.getString("Cno"));hang.add(rs.getString("Cname"));System.out.print(rs.getString("Cname"));hang.add(rs.getString("Cpno"));System.out.print(rs.getString("Cpno"));hang.add(rs.getString("Ccredit"));System.out.print(rs.getString("Ccredit"));rowData.add(hang);}jt=new JTable(rowData,columnNames);jsp=new JScrollPane(jt);this.add(jsp);this.setSize(400,300);this.setVisible(true);}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

SelS

/*
SelS
*/
package sc;import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
public class SelS extends JPanel implements ActionListener{JTextField 学号,姓名,性别,年龄,所在系系名;JButton 查找;JTextField 课程号,课程名,先修课课程号,学分;JButton 查找1;JTextField 课号1,学号1,成绩;JButton 查找2;public SelS (){学号=new JTextField(12);姓名=new JTextField(12);性别=new JTextField(12);年龄=new JTextField(12);所在系系名=new JTextField(12);课程号=new JTextField(12);课程名=new JTextField(12);先修课课程号=new JTextField(12);学分=new JTextField(12);课号1=new JTextField(12);学号1=new JTextField(12);成绩=new JTextField(12);查找=new JButton("查找学生信息");查找1=new JButton("查找课程信息");查找2=new JButton("查找选课信息");Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();Box box6=Box.createHorizontalBox();Box box7=Box.createHorizontalBox();box1.add(new JLabel("学号:",JLabel.CENTER));box1.add(学号);box1.add(new JLabel("姓名:",JLabel.CENTER));box1.add(姓名);box1.add(new JLabel("性别:",JLabel.CENTER));box1.add(性别);box1.add(new JLabel("年龄:",JLabel.CENTER));box1.add(年龄);box1.add(new JLabel("所在系系名:",JLabel.CENTER));box1.add(所在系系名);box2.add(查找);box4.add(new JLabel("课程号:",JLabel.CENTER));box4.add(课程号);box4.add(new JLabel("课程名:",JLabel.CENTER));box4.add(课程名);box4.add(new JLabel("先修课课程号:",JLabel.CENTER));box4.add(先修课课程号);box4.add(new JLabel("学分:",JLabel.CENTER));box4.add(学分);box6.add(查找1);box5.add(new JLabel("课程号:",JLabel.CENTER));box5.add(课号1);box5.add(new JLabel("学号:",JLabel.CENTER));box5.add(学号1);box5.add(new JLabel("成绩:",JLabel.CENTER));box5.add(成绩);box7.add(查找2);Box boxH1=Box.createVerticalBox();//竖放boxboxH1.add(box1);boxH1.add(box2);boxH1.add(Box.createVerticalGlue());Box boxH2=Box.createVerticalBox();//竖放boxboxH2.add(box4);boxH2.add(box6);boxH2.add(Box.createVerticalGlue());Box boxH3=Box.createVerticalBox();//竖放boxboxH3.add(box5);boxH3.add(box7);boxH3.add(Box.createVerticalGlue());查找.addActionListener(this);查找1.addActionListener(this);查找2.addActionListener(this);JPanel messPanel=new JPanel();JPanel picPanel=new JPanel();JPanel threePanel=new JPanel();messPanel.add(boxH1);picPanel.add(boxH2);threePanel.add(boxH3);setLayout(new BorderLayout());JSplitPane splitV=new JSplitPane(JSplitPane.VERTICAL_SPLIT,messPanel,picPanel);//分割add(splitV,BorderLayout.CENTER);JSplitPane splitV1=new JSplitPane(JSplitPane.VERTICAL_SPLIT,splitV,threePanel);//分割add(splitV1,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent c){Object obj=c.getSource();Statement stmt=null;ResultSet rs=null;int row=0;int i=0;String sql=null;//Student K;SelC K1;SelS K2;if(obj==查找){if(学号.getText().equals("")&&姓名.getText().equals("")&&性别.getText().equals("")&&年龄.getText().equals("")&&所在系系名.getText().equals("")){sql="select * from Student ";System.out.print("00");//00}else if(学号.getText().equals("")){if(姓名.getText().equals("")){if(性别.getText().equals("")){if(年龄.getText().equals("")) {sql="select * from Student where Sdept like'%"+所在系系名.getText()+"%'";System.out.print("10");}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sage like'%"+年龄.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'";}}}else {if(年龄.getText().equals("")) {if(所在系系名.getText().equals("")) {sql="select * from Student where Ssex like'%"+性别.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Ssex like'%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'";}}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'";}}}}else{if(性别.getText().equals("")){if(年龄.getText().equals("")) {if(所在系系名.getText().equals("")) {sql="select * from Student where Sname like'%"+姓名.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sname like'%"+姓名.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'";}}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sname like'%"+姓名.getText()+"%'and Sage like '%"+年龄.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sname like'%"+姓名.getText()+"%'and Sage like '%"+年龄.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'";}}}else {if(年龄.getText().equals("")) {if(所在系系名.getText().equals("")) {sql="select * from Student where Ssex like'%"+性别.getText()+"%'and Sname like '%"+姓名.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Ssex like'%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sname like '%"+姓名.getText()+"%'";}}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'and Sname like '%"+姓名.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sname like '%"+姓名.getText()+"%'";}}}}}else{if(姓名.getText().equals("")){if(性别.getText().equals("")){if(年龄.getText().equals("")) {if(所在系系名.getText().equals("")) {sql="select * from Student where Sno like'%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sno like'%"+学号.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'";}}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Sno like '%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sno like '%"+姓名.getText()+"%'";}}}else {if(年龄.getText().equals("")) {if(所在系系名.getText().equals("")) {sql="select * from Student where Ssex like'%"+性别.getText()+"%'and Sno like '%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Ssex like'%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sno like '%"+学号.getText()+"%'";}}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'and Sno like '%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sno like '%"+学号.getText()+"%'";}}}}else{if(性别.getText().equals("")){if(年龄.getText().equals("")) {if(所在系系名.getText().equals("")) {sql="select * from Student where Sname like'%"+姓名.getText()+"%'and Sno like '%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sname like'%"+姓名.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sno like '%"+学号.getText()+"%'";}}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sname like'%"+姓名.getText()+"%'and Sage like '%"+年龄.getText()+"%'and Sno like '%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sname like'%"+姓名.getText()+"%'and Sage like '%"+年龄.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sno like '%"+学号.getText()+"%'";}}}else {if(年龄.getText().equals("")) {if(所在系系名.getText().equals("")) {sql="select * from Student where Ssex like'%"+性别.getText()+"%'and Sname like '%"+姓名.getText()+"%'and Sno like '%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Ssex like'%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sname like '%"+姓名.getText()+"%'and Sno like '%"+学号.getText()+"%'";}}else {if(所在系系名.getText().equals("")) {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'and Sname like '%"+姓名.getText()+"%'and Sno like '%"+学号.getText()+"%'";System.out.print("10");}else {sql="select * from Student where Sage like'%"+年龄.getText()+"%'and Ssex like '%"+性别.getText()+"%'and Sdept like '%"+所在系系名.getText()+"%'and Sname like '%"+姓名.getText()+"%'and Sno like '%"+学号.getText()+"%'";}}}}}//K=new Student(sql);}else{if(obj==查找1){if(课程号.getText().equals("")&&课程名.getText().equals("")&&先修课课程号.getText().equals("")&&学分.getText().equals("")){sql="select * from Course ";System.out.print("00");//00}else if(课程号.getText().equals("")){if(课程名.getText().equals("")){if(先修课课程号.getText().equals("")){sql="select * from Course where Ccredit like'%"+学分.getText()+"%'";System.out.print("10");}else {if(学分.getText().equals("")) {sql="select * from Course where Cpno like'%"+先修课课程号.getText()+"%'";System.out.print("10");}else {sql="select * from Course where Cpno like'%"+先修课课程号.getText()+"%'and Ccredit like '%"+学分.getText()+"%'";}}}else {if(先修课课程号.getText().equals("")&&学分.getText().equals("")){sql="select * from Course where Cno like'%"+课程号.getText()+"%'";System.out.print("10");}else {if(先修课课程号.getText().equals("")){sql="select * from Course where Ccredit like'%"+学分.getText()+"%'and Cno like '%"+课程号.getText()+"%'";System.out.print("10");}else {if(学分.getText().equals("")) {sql="select * from Course where Cpno like'%"+先修课课程号.getText()+"%'and Cno like '%"+课程号.getText()+"%'";System.out.print("10");}else {sql="select * from Course where Cpno like'%"+先修课课程号.getText()+"%'and Cno like '%"+课程号.getText()+"%'and Ccredit like '%"+学分.getText()+"%'";}}}}}else {if(课程名.getText().equals("")){if(先修课课程号.getText().equals("")){if(学分.getText().equals("")) {sql="select * from Course where Cno like'%"+课程号.getText()+"%'";System.out.print("10");}else {sql="select * from Course where Ccredit like'%"+学分.getText()+"%'and Cno like '%"+课程号.getText()+"%'";System.out.print("10");}}else {if(学分.getText().equals("")) {sql="select * from Course where Cpno like'%"+先修课课程号.getText()+"%'and Cno like '%"+课程号.getText()+"%'";System.out.print("10");}else {sql="select * from Course where Ccredit like'%"+学分.getText()+"%'and Cpno like '%"+先修课课程号.getText()+"%'and Cno like '%"+课程号.getText()+"%'";System.out.print("10");}}}else {if(先修课课程号.getText().equals("")){if(学分.getText().equals("")) {sql="select * from Course where Cno like'%"+课程号.getText()+"%'and Cname like '%"+课程名.getText()+"%'";System.out.print("10");}else {sql="select * from Course where Ccredit like'%"+学分.getText()+"%'and Cno like '%"+课程号.getText()+"%'and Cname like '%"+课程名.getText()+"%'";System.out.print("10");}}else {if(学分.getText().equals("")) {sql="select * from Course where Cpno like'%"+先修课课程号.getText()+"%'and Cno like '%"+课程号.getText()+"%'and Cname like '%"+课程名.getText()+"%'";System.out.print("10");}else {sql="select * from Course where Ccredit like'%"+学分.getText()+"%'and Cpno like '%"+先修课课程号.getText()+"%'and Cno like '%"+课程号.getText()+"%'and Cname like '%"+课程名.getText()+"%'";System.out.print("10");}}}}K1=new SelC(sql);}else{if(obj==查找2){if(课号1.getText().equals("")&&学号1.getText().equals("")&&成绩.getText().equals("")){sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("000");//000}else{if(课号1.getText().equals("")){if(学号1.getText().equals("")){sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where grade like'%"+成绩.getText()+"%' and Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("001");}else{if(成绩.getText().equals("")){sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where SC.Sno like'%"+学号1.getText()+"%' and Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("010");}else{sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where SC.Sno like'%"+学号1.getText()+"%'and grade like'%"+成绩.getText()+"%' and Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("011");}}}else{if(学号1.getText().equals("")){if(成绩.getText().equals("")){sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where SC.Cno like'%"+课号1.getText()+"%' and Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("100");}else{sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where SC.Cno like'%"+课号1.getText()+"%' and grade like'%"+成绩.getText()+"%' and Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("101");}}else{if(成绩.getText().equals("")){sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where  SC.Cno like'%"+课号1.getText()+"%' and SC.Sno like'%"+学号1.getText()+"%' and Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("110");}else{sql="select SC.Cno,Cname,SC.Sno,Sname,grade from SC,Course,Student where  SC.Cno like'%"+课号1.getText()+"%' and SC.Sno like'%"+学号1.getText()+"%' and grade like'%"+成绩.getText()+"%' and Course.Cno=SC.Cno and Student.Sno=SC.Sno";System.out.print("111");}}}}K2=new SelS();}}}}
}

SelSC

/*
SelSC
*/
package sc;import java.sql.*;
import javax.swing.*;
//import connection.java;
import java.util.*;public class SelSC extends JFrame {Vector rowData, columnNames;Statement stmt=null;String sql=null;JTable jt = null;JScrollPane jsp = null;PreparedStatement ps=null;ResultSet rs=null;public SelSC(String sql1){columnNames = new Vector();// 设置列名columnNames.add("课程号");columnNames.add("学号");columnNames.add("成绩");rowData=new Vector();sql=sql1;try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs=stmt.executeQuery(sql);while(rs.next()){Vector hang = new Vector();hang.add(rs.getString("Sno"));System.out.print(rs.getString("Sno"));hang.add(rs.getString("Cno"));System.out.print(rs.getString("Cno"));hang.add(rs.getString("grade"));System.out.println(rs.getString("grade"));rowData.add(hang);}jt=new JTable(rowData,columnNames);jsp=new JScrollPane(jt);this.add(jsp);this.setSize(400,300);this.setVisible(true);}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

UpdateC

/*
UpdateC
*/
package sc;import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;public class UpdateC extends JPanel implements ActionListener{String save=null;JTextField 课号1,课程号,课程名,先修课课程号,学分;JButton 修改,查找;public UpdateC(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}课号1=new JTextField(12);课程号=new JTextField(12);课程名=new JTextField(12);先修课课程号=new JTextField(12);学分=new JTextField(12);修改=new JButton("修改");查找=new JButton("查找");Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();Box box6=Box.createHorizontalBox();Box box7=Box.createHorizontalBox();box1.add(new JLabel("课程号:",JLabel.CENTER));box1.add(课程号);box2.add(new JLabel("课程名:",JLabel.CENTER));box2.add(课程名);box3.add(new JLabel("先修课课程号:",JLabel.CENTER));box3.add(先修课课程号);box4.add(new JLabel("学分:",JLabel.CENTER));box4.add(学分);box6.add(修改);box7.add(new JLabel("课号:",JLabel.CENTER));box7.add(课号1);box7.add(查找);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(box5);boxH.add(box6);修改.addActionListener(this);查找.addActionListener(this);boxH.add(Box.createVerticalGlue());JPanel picPanel=new JPanel();JPanel messPanel=new JPanel();messPanel.add(box7);picPanel.add(boxH);setLayout(new BorderLayout());JSplitPane splitV=new JSplitPane(JSplitPane.VERTICAL_SPLIT,messPanel,picPanel);//分割add(splitV,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent e){Object obj=e.getSource();Statement stmt=null;ResultSet rs=null,rs1=null;String sql=null,sql1=null,sqlSC=null;if(obj==查找){if(课号1.getText().equals(""))JOptionPane.showMessageDialog(this,"请填写查询的课号！" );else{sql1="select * from Course where Cno='"+课号1.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){课程号.setText(rs1.getString("Cno").trim());课程名.setText(rs1.getString("Cname").trim());先修课课程号.setText(rs1.getString("Cpno").trim());学分.setText(rs1.getString("Ccredit").trim());save=课号1.getText();}else{JOptionPane.showMessageDialog(this,"没有这个课号的课程" );}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}else{if(obj==修改){if(save==null){JOptionPane.showMessageDialog(this,"还没查找需要修改的课程" );}else{if(课程号.getText().equals("")||课程名.getText().equals("")||先修课课程号.getText().equals("")||学分.getText().equals("")){JOptionPane.showMessageDialog(this,"课程信息填满才能修改！" );}else{sql="update Course set Cno='"+课程号.getText()+"',Cname='"+课程名.getText()+"',Cpno='"+先修课课程号.getText()+"',Ccredit='"+学分.getText()+"' where Cno='"+save+"'";if(save.trim().equals(课程号.getText().trim())){try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);stmt.executeUpdate(sql);save=null;JOptionPane.showMessageDialog(this,"修改完成" );课程号.setText("");课程名.setText("");stmt.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}else{sql1="select * from Course where Cno='"+课程号.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){   JOptionPane.showMessageDialog(this,"已存在此课号课程" );}else{sqlSC="update SC set Cno='"+课程号.getText()+"' where Cno='"+save+"'";stmt.executeUpdate(sql);stmt.executeUpdate(sqlSC);save=null;JOptionPane.showMessageDialog(null,"修改完成" );课程号.setText("");课程名.setText("");先修课课程号.setText("");学分.setText("");}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}}}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

UpdateS

/*
UpdateS
*/
package sc;import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;public class UpdateS extends JPanel implements ActionListener{String save=null;JTextField 学号1,学号,姓名,性别,年龄,所在系系名;JButton 修改,查找;public UpdateS(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}学号1=new JTextField(12);学号=new JTextField(12);姓名=new JTextField(12);性别=new JTextField(12);年龄=new JTextField(12);所在系系名=new JTextField(12);修改=new JButton("修改");查找=new JButton("查找");Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();Box box6=Box.createHorizontalBox();Box box7=Box.createHorizontalBox();box1.add(new JLabel("学号:",JLabel.CENTER));box1.add(学号);box2.add(new JLabel("姓名:",JLabel.CENTER));box2.add(姓名);box3.add(new JLabel("性别:",JLabel.CENTER));box3.add(性别);box4.add(new JLabel("年龄:",JLabel.CENTER));box4.add(年龄);box5.add(new JLabel("所在系系名:",JLabel.CENTER));box5.add(所在系系名);box6.add(修改);box7.add(new JLabel("学号:",JLabel.CENTER));box7.add(学号1);box7.add(查找);修改.addActionListener(this);查找.addActionListener(this);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(box5);boxH.add(box6);boxH.add(Box.createVerticalGlue());JPanel picPanel=new JPanel();JPanel messPanel=new JPanel();messPanel.add(box7);picPanel.add(boxH);setLayout(new BorderLayout());JSplitPane splitV=new JSplitPane(JSplitPane.VERTICAL_SPLIT,messPanel,picPanel);//分割add(splitV,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent e){Object obj=e.getSource();Statement stmt=null;ResultSet rs=null,rs1=null;String sql=null,sql1=null,sqlSC;if(obj==查找){if(学号1.getText().equals(""))JOptionPane.showMessageDialog(this,"请填写查询的学号！" );else{sql1="select * from Student where Sno='"+学号1.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){学号.setText(rs1.getString("Sno").trim());姓名.setText(rs1.getString("Sname").trim());性别.setText(rs1.getString("Ssex").trim());年龄.setText(rs1.getString("Sage").trim());所在系系名.setText(rs1.getString("Sdept").trim());save=学号1.getText();}else{JOptionPane.showMessageDialog(this,"没有这个学号的学生" );}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}else{if(obj==修改){if(save==null){JOptionPane.showMessageDialog(this,"还没查找需要修改的学生" );}else{if(学号.getText().equals("")||姓名.getText().equals("")||性别.getText().equals("")||年龄.getText().equals("")||所在系系名.getText().equals("")){JOptionPane.showMessageDialog(this,"学生信息填满才能修改！" );}else{sql="update Student set Sno='"+学号.getText()+"',Sname='"+姓名.getText()+"',Ssex='"+性别.getText()+"',Sage='"+年龄.getText()+"',Sdept='"+所在系系名.getText()+"'where Sno='"+save+"'";if(save.trim().equals(学号.getText().trim())){try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);stmt.executeUpdate(sql);save=null;JOptionPane.showMessageDialog(this,"修改完成" );学号.setText("");姓名.setText("");性别.setText("");年龄.setText("");所在系系名.setText("");stmt.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}else{sql1="select * from Student where Sno='"+学号.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){      JOptionPane.showMessageDialog(this,"已存在此学号学生" );}else{sqlSC="update SC set Sno='"+学号.getText()+"' where Sno='"+save+"'";stmt.executeUpdate(sql);stmt.executeUpdate(sqlSC);save=null;JOptionPane.showMessageDialog(null,"修改完成" );学号.setText("");姓名.setText("");性别.setText("");年龄.setText("");所在系系名.setText("");}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}}}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

UpdateSC

/*
UpdateSC
*/
package sc;import java.awt.*;
import java.awt.event.*;
import java.sql.*;import javax.swing.*;
public class UpdateSC extends JPanel implements ActionListener{String saveC=null;String saveS=null;JTextField 课号1,学号1,学号,课程号,成绩;JButton 修改,查找;public UpdateSC(){try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}学号1=new JTextField(12);课号1=new JTextField(12);课程号=new JTextField(12);学号=new JTextField(12);成绩=new JTextField(12);修改=new JButton("修改");查找=new JButton("查找");Box box1=Box.createHorizontalBox();//横放boxBox box2=Box.createHorizontalBox();Box box3=Box.createHorizontalBox();Box box4=Box.createHorizontalBox();Box box5=Box.createHorizontalBox();box1.add(new JLabel("课程号:",JLabel.CENTER));box1.add(课程号);box2.add(new JLabel("学号:",JLabel.CENTER));box2.add(学号);box3.add(new JLabel("成绩:",JLabel.CENTER));box3.add(成绩);box4.add(修改);box5.add(new JLabel("课号:",JLabel.CENTER));box5.add(课号1);box5.add(new JLabel("学号:",JLabel.CENTER));box5.add(学号1);box5.add(查找);Box boxH=Box.createVerticalBox();//竖放boxboxH.add(box1);boxH.add(box2);boxH.add(box3);boxH.add(box4);boxH.add(Box.createVerticalGlue());修改.addActionListener(this);查找.addActionListener(this);JPanel picPanel=new JPanel();JPanel messPanel=new JPanel();messPanel.add(box5);picPanel.add(boxH);setLayout(new BorderLayout());JSplitPane splitV=new JSplitPane(JSplitPane.VERTICAL_SPLIT,messPanel,picPanel);//分割add(splitV,BorderLayout.CENTER);validate();}public void actionPerformed(ActionEvent e){Object obj=e.getSource();Statement stmt=null;ResultSet rs=null,rs1=null,rsC=null,rsS=null;String sql,sql1,sqlS,sqlC;if(obj==查找){if(课号1.getText().equals("")||学号1.getText().equals(""))JOptionPane.showMessageDialog(this,"请填写完成查询的信息！" );else{sql1="select * from SC where Cno='"+课号1.getText()+"' and Sno='"+学号1.getText()+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rs1=stmt.executeQuery(sql1);if(rs1.next()){课程号.setText(rs1.getString("Cno").trim());学号.setText(rs1.getString("Sno").trim());成绩.setText(rs1.getString("grade").trim());saveC=课号1.getText().trim();saveS=学号1.getText().trim();}else{JOptionPane.showMessageDialog(this,"没有这个课号的学生" );}stmt.close();rs1.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}else{if(obj==修改){if(saveC==null||saveS==null)JOptionPane.showMessageDialog(this,"还没查找需要修改的学生/课程" );else{if(课程号.getText().equals("")||学号.getText().equals("")){JOptionPane.showMessageDialog(this,"课程信息填满才能修改！" );}else{sqlC="select * from Course where Cno='"+课程号.getText()+"'";sqlS="select * from Student where Sno='"+学号.getText()+"'";sql1="select * from SC where Cno='"+课程号.getText()+"' and Sno='"+学号.getText()+"'";sql="update SC set Cno='"+课程号.getText()+"',Sno='"+学号.getText()+"',grade='"+成绩.getText()+"' where Cno='"+saveC+"' and Sno='"+saveS+"'";try{Connection dbConn1=CONN();stmt=(Statement)dbConn1.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rsC=stmt.executeQuery(sqlC);if(rsC.next()){rsS=stmt.executeQuery(sqlS);if(rsS.next()){if(课程号.getText().trim().equals(saveC)&& 学号.getText().trim().equals(saveS)){stmt.executeUpdate(sql);JOptionPane.showMessageDialog(this,"添加成功");saveC=null;saveS=null;}else{rs1=stmt.executeQuery(sql1);if(rs1.next()){JOptionPane.showMessageDialog(this,"学生与课程号以存在，无法修改");}else{stmt.executeUpdate(sql);JOptionPane.showMessageDialog(this,"添加成功");saveC=null;saveS=null;}rs1.close();}}else{JOptionPane.showMessageDialog(this,"该学生不存在，无法修改");}rsS.close();}else{JOptionPane.showMessageDialog(this,"该课程不存在，无法修改");}rsC.close();stmt.close();}catch(SQLException e1){System.out.print("SQL Exception occur.Message is:"+e1.getMessage());}}}}}}public static Connection CONN(){String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";   //加载JDBC驱动String dbURL = "jdbc:sqlserver://主机名:1433; DatabaseName=数据库名";   //连接服务器和数据库testString userName = "sa";   //默认用户名String userPwd = "密码";   //密码Connection dbConn=null;try {Class.forName(driverName);dbConn = DriverManager.getConnection(dbURL, userName, userPwd);System.out.println("Connection Successful!");   //如果连接成功 控制台输出Connection Successful!} catch (Exception e) {e.printStackTrace();}return dbConn;}}

Menu

package sc;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class Menu extends JFrame implements ActionListener{AddS 增加学生界面;UpdateS 修改学生界面;DelS 删除学生界面;AddC 增加课程界面;DelC 删除课程界面;UpdateC 修改课程界面;AddSC 增加选课界面;DelSC 删除选课界面;UpdateSC 修改选课界面;SelS 学生查询界面;JPanel pCenter;CardLayout card=null;JLabel label=null;JMenuBar mb=new JMenuBar();//菜单栏JMenu m1=new JMenu("学生管理");JMenuItem add1=new JMenuItem("add   ");JMenuItem updata1=new JMenuItem("update   ");JMenuItem delete1=new JMenuItem("delete   ");JMenu m2=new JMenu("课程管理");JMenuItem add2=new JMenuItem("add   ");JMenuItem updata2=new JMenuItem("update   ");JMenuItem delete2=new JMenuItem("delete   ");JMenu m3=new JMenu("选课管理");JMenuItem add3=new JMenuItem("add   ");JMenuItem updata3=new JMenuItem("update   ");JMenuItem delete3=new JMenuItem("delete   ");JMenu m4=new JMenu("查询管理");JMenuItem 学生查询=new JMenuItem("查询信息   ");JMenuItem m5=new JMenuItem("系统退出");Font t=new Font ("sanerif",Font.PLAIN,12);public Menu (){this.setTitle("学生成绩管理系统");try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){System.err.println("不能设置外观:   "+e);}//组合菜单addMenu1();addMenu2();addMenu3();addMenu4();addJMenuBar();setJMenuBar(mb);label=new JLabel("BJTU成绩管理系统",JLabel.CENTER);label.setFont(new Font("宋体",Font.BOLD,36));label.setHorizontalTextPosition(SwingConstants.CENTER);label.setForeground(Color.blue);//点击事件add1.addActionListener(this);updata1.addActionListener(this);delete1.addActionListener(this);m5.addActionListener(this);add2.addActionListener(this);delete2.addActionListener(this);updata2.addActionListener(this);add3.addActionListener(this);delete3.addActionListener(this);updata3.addActionListener(this);学生查询.addActionListener(this);card=new CardLayout();pCenter=new JPanel();pCenter.setLayout(card);增加学生界面=new AddS();修改学生界面=new UpdateS();删除学生界面=new DelS();增加课程界面=new AddC();删除课程界面=new DelC();修改课程界面=new UpdateC();增加选课界面=new AddSC();删除选课界面=new DelSC();修改选课界面=new UpdateSC();学生查询界面=new SelS();pCenter.add("欢迎界面",label);pCenter.add("增加学生界面",增加学生界面);pCenter.add("修改学生界面",修改学生界面);pCenter.add("删除学生界面",删除学生界面);pCenter.add("增加课程界面",增加课程界面);pCenter.add("删除课程界面",删除课程界面);pCenter.add("修改课程界面",修改课程界面);pCenter.add("增加选课界面",增加选课界面);pCenter.add("删除选课界面",删除选课界面);pCenter.add("修改选课界面",修改选课界面);pCenter.add("学生查询界面", 学生查询界面);add(pCenter,BorderLayout.CENTER);validate();setVisible(true);setBounds(400,150,1200,790);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);addWindowListener(new WindowAdapter(){//关闭程序时的操作public void windowClosing(WindowEvent e){System.exit(0);}});validate();}private void addJMenuBar() {mb.add(m1);mb.add(m2);mb.add(m3);mb.add(m4);mb.add(m5);}private void addMenu4() {m4.add(学生查询);m4.setFont(t);}private void addMenu3() {m3.add(add3);m3.add(updata3);m3.add(delete3);m3.setFont(t);}private void addMenu2() {//将菜单加入到菜单栏中m2.add(add2);m2.add(updata2);m2.add(delete2);m2.setFont(t);}private void addMenu1() {m1.add(add1);m1.add(updata1);m1.add(delete1);m1.setFont(t);//字体}public void actionPerformed(ActionEvent e){Object obj=e.getSource();if(obj==m5){System.exit(0);}else{if(obj==add1){card.show(pCenter,"增加学生界面");}else{if(obj==updata1){card.show(pCenter,"修改学生界面");}else{if(obj==delete1){card.show(pCenter, "删除学生界面");}else{if(obj==add2){card.show(pCenter, "增加课程界面");}else{if(obj==delete2){card.show(pCenter, "删除课程界面");}else{if(obj==updata2){card.show(pCenter, "修改课程界面");}else{if(obj==add3){card.show(pCenter, "增加选课界面");}else{if(obj==delete3){card.show(pCenter, "删除选课界面");}else{if(obj==updata3){card.show(pCenter, "修改选课界面");}else{if(obj==学生查询){card.show(pCenter, "学生查询界面");}}}}}}}}}}}}public static void main(String[] args) {new Menu();}
}


  • 需求分析
    • E-R图
      • 逻辑关系
    • 物理设计和实施
      • 创建包、Add、Del、Update、Sel
  • idea链接数据库
    • 简单SQL语句
      • 答辩

idea链接数据库

File+settings+editor+plugins+database navigator+apply+ok
出现感叹号：
进connection+properties+serverTimezone+Asia/Shanghai+test connection

简单SQL语句

按老师要求还是进行一点语句补充吧(如果觉得费钱就把重复的代码保留一个表的，其他的做文字说明就可以了）

建表：

CREATE TABLE student(
sno CHAR(10),
sname VARCHAR(20),
ssex CHAR(2),
sage INT,
sdept CHAR(15)
);

增：

insert into 表名(属性1，属性2）value ('内容1','内容2')

删：

delete from 表名 where 学号='****'

改：

update  表名  set  成绩=NULL

查：

select student.sno,sname,ssex,sage,sdept,cno
from 学生成绩管理.student,学生成绩管理.sc
where 学生成绩管理.student.sno=学生成绩管理.sc.sno

对成绩的查询：

select student.sname ,grade
from 学生成绩管理.student,学生成绩管理.sc
where 学生成绩管理.student.sno=学生成绩管理.sc.sno


//不优秀的学生学号、课程号、成绩
select sno,cno,grade
from 学生成绩管理.sc
where grade<80;//不优秀课程的学生学号
select distinct sno
from 学生成绩管理.sc
where grade<80;//所有课程信息及选修该课程的学生学号及成绩
select cname,sno,grade
from 学生成绩管理.sc,学生成绩管理.course
where 学生成绩管理.course.cno =学生成绩管理.sc.cno/*选修5号课程成绩80分以上学生学号姓名及成绩
select student.sno,sname,grade
from 学生成绩管理.sc
where 学生成绩管理.student.sno=学生成绩管理.sc.sno
and sc.cno='5'
and sc.grade>80
*///每个学生及选修课程名及成绩
select student.sno,sname,cname,sc.grade
from 学生成绩管理.student,学生成绩管理.sc,学生成绩管理.course
where student.sno=sc.sno
and sc.cno=course.cno

对成绩的统计：
1、使用MAX ()函数统计某个字段最大数据；
2、使用MIN ()函数统计某个字段最小数据；
3、使用COUNT ()函数统计查询结果的行数；
4、使用SUM ()函数统计数据之和；
5、使用AVG ()函数统计平均数。 MySQL MAX () 函数

答辩

好了好了就到这里，答辩讲解需求分析和E-R图为主，明天答辩祝我自己好运，过过过

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