JAVA学生管理系统 第8页

JAVA学生管理系统 第8页
import java.sql.*;

/**
 * 连接数据库的类
 */
public class Database {
 
 private Statement stmt=null;
 ResultSet rs=null;
 private Connection conn=null;
 String sql;
 String strurl="jdbc:odbc:scmanage";
 
 public Database(){
 }
 
 /**
  * 打开数据库连接
  */
 public void OpenConn()throws Exception{
  try{
   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
   conn=DriverManager.getConnection(strurl);
  }
  catch(Exception e){
   System.err.println("OpenConn:"+e.getMessage());
  }
 }

 /**
  * 执行sql语句，返回结果集rs
  */
 public ResultSet executeQuery(String sql){
  stmt = null;
  rs=null;
  try{
   stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
   rs=stmt.executeQuery(sql);
  }
  catch(SQLException e){
   System.err.println("executeQuery:"+e.getMessage());
  }
  return rs;
 }

 /**
  * 执行sql语句
  */
 public void executeUpdate(String sql){
  stmt=null;
  rs=null;
  try{
   stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
   stmt.executeQuery(sql);
   conn.commit();
  }
  catch(SQLException e){
   System.err.println("executeUpdate:"+e.getMessage());
  }
 }
 
 public void closeStmt(){
  try{
   stmt.close();
  }
  catch(SQLException e){
   System.err.println("closeStmt:"+e.getMessage());
  }
 }

 /**
  * 关闭数据库连接
  */
 public void closeConn(){
  try{
   conn.close();
  }
  catch(SQLException ex){
   System.err.println("aq.closeConn:"+ex.getMessage());
  }
 }
 
 /*
import java.awt.*;
import java.sql.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * 课程信息管理模块
 * 修改课程信息的类
 */
public class DelCourseInfo extends CourseInfo{
 String cNum_str = "";
 public DelCourseInfo() {
  this.setTitle("删除课程信息");
  this.setResizable(false);

  cNum.setEditable(false);
  cNum.setText("请查询课程号");
  cName.setEditable(false);
  cTeacher.setEditable(false);
  cType.setEditable(false);
  cTime.setEditable(false);
  cPlace.setEditable(false);

  //设置运行位置，使对话框居中
  Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
  this.setLocation( (int) (screenSize.width - 400) / 2 ,
      (int) (screenSize.height - 300) / 2 +45);
 }

 public void downInit(){
  searchInfo.setText("查询");
  searchInfo.setFont(new Font("Dialog",0,12));
  downPanel.add(searchInfo);
  deleteInfo.setText("删除");
  deleteInfo.setFont(new Font("Dialog",0,12));
  downPanel.add(deleteInfo);
  clearInfo.setText("清空");
  clearInfo.setFont(new Font("Dialog",0,12));
  downPanel.add(clearInfo);
  eixtInfo.setText("退出");
  eixtInfo.setFont(new Font("Dialog",0,12));
  downPanel.add(eixtInfo);

  contentPane.add(downPanel,BorderLayout.SOUTH);

  searchInfo.setEnabled(true);
  deleteInfo.setEnabled(false);
  eixtInfo.setEnabled(true);

  //添加事件侦听
  searchInfo.addActionListener(this);
  deleteInfo.addActionListener(this);
  eixtInfo.addActionListener(this);
 }
 /**
  * 事件处理
  */
 public void actionPerformed(ActionEvent e) {
  Object obj = e.getSource();
  String[] s = new String[5];

  if (obj == eixtInfo) { //退出
   this.dispose();
  }
  else if (obj == deleteInfo) { //删除
   int ifdel = JOptionPane.showConfirmDialog(null,"真的要删除该信息？","提示信息",JOptionPane.YES_NO_OPTION,JOptionPane.INFORMATION_MESSAGE );
   if(ifdel == JOptionPane.YES_OPTION){
    CrsBean delCrs = new CrsBean();
    delCrs.crsDel(cNum.getText());
    
    this.dispose();

    DelCourseInfo dci = new DelCourseInfo();
    dci.downInit();
    dci.pack();
    dci.setVisible(true);
   }
   else{
    return;
   }
  }
  else if (obj == searchInfo) { //学号查询
   CourseInfoSearchCnum cisc = new CourseInfoSearchCnum(this);
   cisc.pack();
   cisc.setVisible(true);
   cNum_str = cisc.getCnum();

   CrsBean searchCrs = new CrsBean();
   s = searchCrs.crsSearch(cNum_str);
   if(s == null){
    JOptionPane.showMessageDialog(null, "记录不存在！");
    cNum.setText("请查询学号");
    cName.setText("");
    cTeacher.setText("");
    cPlace.setText("");
    cType.setText("");
    cTime.setText("");
        
    cName.setEditable(false);
    cTeacher.setEditable(false);
    cPlace.setEditable(false);
    cType.setEditable(false);
    cTime.setEditable(false);
    deleteInfo.setEnabled(false);
    return;
   }
   else{
    cNum.setText(cNum_str);
    cName.setText(s[0]);
    cTeacher.setText(s[1]);
    cPlace.setText(s[2]);
    cType.setText(s[3]);
    cTime.setText(s[4]);

    cName.setEditable(true);
    cTeacher.setEditable(true);
    cPlace.setEditable(true);
    cType.setEditable(true);
    cTime.setEditable(true);
    deleteInfo.setEnabled(true);   }  } }

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