201906G102/Test3.java

package C;


 import javax.swing.*;
 import java.util.*;
 import java.awt.*;
 import java.awt.event.*;
 import java.sql.Connection;
 import java.sql.Driver;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 
 public class Test3 extends JFrame implements ActionListener {
     //定义一些控件
     JPanel jp1,jp2;
     JLabel jl1,jl2;
     JButton jb1,jb2,jb3,jb4,jb5;
     JTable jt;
     JScrollPane jsp;
     JTextField jtf;
     StuModel sm;
     //定义连接数据库的变量
     Statement stat = null;
     PreparedStatement ps;
     Connection ct = null;
     ResultSet rs = null;
     
     public static void main(String[] args){
         Test3 test3 = new Test3();
     }
     //构造函数
     public Test3(){
         jp1 = new JPanel();
         jtf = new JTextField(10);
         jb1 = new JButton("查询");
         jb1.addActionListener(this);
         jl1 = new JLabel("请输入设备名称：");
         jp1.add(jl1);
         jp1.add(jtf);
         jp1.add(jb1);
         jb5 = new JButton("返回");
         jb5.addActionListener(this);
         jp1.add(jb5);
 
         jb2 = new JButton("添加");
         jb2.addActionListener(this);
         jb3 = new JButton("修改");
         jb3.addActionListener(this);
         jb4 = new JButton("删除");
         jb4.addActionListener(this);

         
         jp2 = new JPanel();
         jp2.add(jb2);
         jp2.add(jb3);
         jp2.add(jb4);
         //创建模型对象
         sm = new StuModel();
         
         
         //初始化
         jt = new JTable(sm);
         
         jsp = new JScrollPane(jt);
         
         //将jsp放入到jframe中
         this.add(jsp);
         this.add(jp1,"North");
         this.add(jp2,"South");
         this.setSize(600, 400);
         this.setLocation(300, 200);
         this.setDefaultCloseOperation(EXIT_ON_CLOSE);
         this.setVisible(true);
     
     }
     public void actionPerformed(ActionEvent arg0) {
         //判断是哪个按钮被点击
      if(arg0.getSource() == jb1){
          System.out.println("用户希望被查询...");
         //因为把对表的数据封装到StuModel中，可以比较简单的完成查询
         String name = this.jtf.getText().trim();
         //写一个sql语句
         String sql = "select * from stu where 设备名称 = '"+name+"' ";
         //构建一个数据模型类，并更新
         sm = new StuModel(sql);
         //更新jtable
           jt.setModel(sm);        
       }
      else if(arg0.getSource() == jb5){
    	      System.out.println("返回...");
    	      String sql = "select * from stu";
              sm = new StuModel(sql);
              jt.setModel(sm);
       }	      
      
      //一、弹出添加界面
      else if(arg0.getSource() == jb2){
      System.out.println("添加...");
      StuAddDiag sa = new StuAddDiag(this,"添加设备",true);
          
      //重新再获得新的数据模型,
      sm = new StuModel();
      jt.setModel(sm);

      }else if(arg0.getSource() == jb4){
      //二、删除记录
      //1.得到的ID
      int rowNum = this.jt.getSelectedRow();//getSelectedRow会返回给用户点中的行
      //如果该用户一行都没有选，就返回-1
      if(rowNum == -1){
      //提示
      JOptionPane.showMessageDialog(this, "请选中一行");
      return ;
      }
     //得到设备ID
      String 设备Id = (String)sm.getValueAt(rowNum, 0);
      System.out.println("Id：   "+设备Id);
          
      //连接数据库,完成删除任务
      try{
         //1.加载驱动
      Class.forName("com.mysql.jdbc.Driver");    
      //2.连接数据库
      String url = "jdbc:mysql://localhost:3306/spdb1";
      String user = "root";
      String passwd = "qsefthuko";
              
      ct = DriverManager.getConnection(url, user, passwd);
      System.out.println("连接成功");
      ps = ct.prepareStatement("delete from stu where 设备Id = ?");

      ps.setString(1,设备Id);

      ps.executeUpdate();
                       
      }catch(Exception e){
          e.printStackTrace();
      }finally{
      try{
          if(rs!= null){
          rs.close();
          rs = null;
                      
          }
          if(ps!= null){
          ps.close();
          ps = null;
          }
          if(ct != null){
          ct.close();
          ct = null;
          }
      } catch(Exception e){
          e.printStackTrace();
      }
          }
      sm = new StuModel();
     //更新jtable
      jt.setModel(sm); 
      }else if(arg0.getSource() == jb3){
      System.out.println("11111");
      //三、用户希望修改
      int rowNum = this.jt.getSelectedRow();
      if(rowNum == -1){
      //提示
      JOptionPane.showMessageDialog(this, "请选择一行");
      return ;
      }
      //显示对话框
      System.out.println( "12435");
     StuUpDiag su = new StuUpDiag(this, "修改设备", true, sm, rowNum);
     sm = new StuModel();
     jt.setModel(sm);
      }    
     }
 }