mysql数据库学生成绩管理系统

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.*;publicclass 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 whereSC.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 whereSC.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();}}}}}