sqltimestampframe.java

JAVA数据库编程实例随书源码

package sqltimestamp;

import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

/**
 * Title:			使用Timestamp类进行数据库操作
 * Description:			教学示范
 * Copyright:			Copyright (c) 2003
 * Company:			北京师范大学计算机系
 * @author			孙一林
 * @version			1.0
 */

public class sqlTimeStampFrame extends JFrame {
  private JPanel contentPane;
  private Label label1 = new Label();
  private TextField nameField = new TextField();
  private Button insertButton = new Button();
  private Button refreshButton = new Button();

  Connection connection = null;                //定义与数据库进行连接的Connection对象
  ResultSet rs = null;                         //定义数据库查询的结果集
  Statement statement = null;                  //定义查询数据库的Statement对象
  boolean lastQuery = false;                   //上次查询是否成功
  Vector vector;                               //定义存储结果集数据的数组
  String[] title = {"姓名","访问时间"};          //定义显示数据表格的标题
  AbstractTableModel tm;                       //定义显示数据表格的抽象类
  JScrollPane scroll;                          //定义装载数据表格的容器

  public sqlTimeStampFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception  {          //初始化用户界面
    contentPane = (JPanel) this.getContentPane();
    refreshButton.setLabel("刷新访问记录");
    refreshButton.setBounds(new Rectangle(206, 308, 111, 28));
    refreshButton.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        refreshButton_actionPerformed(e);
      }
    });
    insertButton.setLabel("添加访问记录");
    insertButton.setBounds(new Rectangle(89, 308, 107, 28));
    insertButton.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        insertButton_actionPerformed(e);
      }
    });
    label1.setText("姓名：");
    label1.setBounds(new Rectangle(105, 19, 39, 25));
    contentPane.setLayout(null);
    this.setSize(new Dimension(400, 385));
    this.setTitle("使用时间戳存取数据库");
    nameField.setBounds(new Rectangle(151, 19, 143, 25));
    contentPane.add(nameField, null);
    contentPane.add(label1, null);
    contentPane.add(refreshButton, null);
    contentPane.add(insertButton, null);
  }

  void initTable() {                           //初始化显示数据集结果的表格
    JTable table;
    vector = new Vector();
    tm = new AbstractTableModel() {            //实现表格抽象类的接口
      public int getColumnCount() {
        return title.length;
      }
      public int getRowCount() {
        return vector.size();
      }
      public Object getValueAt(int row, int column) {
        if(!vector.isEmpty())
        {
          return ((Vector)vector.elementAt(row)).elementAt(column);
        }
        else
        {
          return null;
        }
      }
      public void setValueAt(Object value, int row, int column)
      {

      }
      public String getColumnName(int column)
      {
        return title[column];
      }
      public Class getColumnClass(int c)
      {
        return getValueAt(0,c).getClass();
      }
      public boolean isCellEditable(int row, int column)
      {
        return false;
      }
    };
    table = new JTable(tm);
    table.setToolTipText("Display Query Result");
    table.setAutoResizeMode(table.AUTO_RESIZE_SUBSEQUENT_COLUMNS);
    table.setCellSelectionEnabled(false);
    table.setShowHorizontalLines(true);
    table.setShowVerticalLines(true);
    scroll = new JScrollPane(table);
    scroll.setBounds(50,50,300,200);
    contentPane.add(scroll,null);
  }

  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      try
      {
        connection.close();
      }
      catch(Exception ex)
      {
        ex.printStackTrace();
      }
      System.exit(0);
    }
  }

  void insertButton_actionPerformed(ActionEvent e) { //将用户名以及访问时间插入数据库
    String name = nameField.getText();
    java.sql.Timestamp timestamp = new java.sql.Timestamp(new java.util.Date().getTime()); //创建Timestamp类实例并将当前时间值赋给给此实例
    try
    {
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");   //指定与数据库连接使用JDBC-ODBC桥驱动程序
      String url = "jdbc:odbc:student";                //指定数据源名
      connection = DriverManager.getConnection(url);   //与数据源建立连接
      statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);  //创建Statement接口实例
      String now_Timestamp = timestamp.toString();     //将Timestamp类实例所代表的时间值转换为字符串表示
      String sql = "insert into studentvisiting(姓名,访问时间) values('" + name + "', '" + now_Timestamp + "')";      //创建插入studentvisiting表数据的SQL语句
      statement.executeUpdate(sql);                    //将新的数据插入到数据库
      JOptionPane msg = new JOptionPane();
      JOptionPane.showMessageDialog(this, "添加记录成功", "添加记录成功！", 1);
    }
    catch(SQLException ex){                          //捕捉异常
      System.out.println("\nERROR:----- SQLException -----\n");
      while (ex != null) {
        System.out.println("Message:   " + ex.getMessage());
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
        ex = ex.getNextException();
      }
    }
    catch(Exception ex ) {
      ex.printStackTrace();
    }
    finally {
      try {
        if(statement != null)
        {
          statement.close();                      //关闭Statement接口实例
        }
        if(connection != null)
        {
          connection.close();                   //关闭Connection接口实例
        }
      }
      catch (SQLException ex)  {
        System.out.println("\nERROR:----- SQLException -----\n");
        System.out.println("Message:   " + ex.getMessage());
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
      }
    }
  }

  void refreshButton_actionPerformed(ActionEvent e) {       //使用表格显示数据库数据
    if(lastQuery)                               //若上次查询成功，则首先清除上次查询的表格
    {
      scroll.setVisible(false);
      contentPane.remove(scroll);
    }
    initTable();                               //初始化新的表格
    try
    {
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");   //指定与数据库连接使用JDBC-ODBC桥驱动程序
      String url = "jdbc:odbc:student";                //指定数据源名
      connection = DriverManager.getConnection(url);   //与数据源建立连接
      statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);  //创建Statement接口实例
      String sql = "select * from studentvisiting";    //创建取出studentvisiting表中所有数据的SQL语句
      rs = statement.executeQuery(sql);                //将数据存入结果集中
      vector.removeAllElements();
      tm.fireTableStructureChanged();                  //刷新表格显示结果集中的数据
      while(rs.next())
      {
        Vector rec_vector = new Vector();
        rec_vector.addElement(rs.getString("姓名"));
        rec_vector.addElement(rs.getString("访问时间"));
        vector.addElement(rec_vector);
      }
      tm.fireTableStructureChanged();
      lastQuery = true;                              //数据库查询操作成功
    }
    catch(SQLException ex){                          //捕捉异常
      System.out.println("\nERROR:----- SQLException -----\n");
      while (ex != null) {
        System.out.println("Message:   " + ex.getMessage());
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
        ex = ex.getNextException();
      }
    }
    catch(Exception ex ) {
      ex.printStackTrace();
    }
    finally {
      try {
        if(statement != null)
        {
          statement.close();                      //关闭Statement接口实例
        }
        if(connection != null)
        {
          connection.close();                   //关闭Connection接口实例
        }
      }
      catch (SQLException ex)  {
        System.out.println("\nERROR:----- SQLException -----\n");
        System.out.println("Message:   " + ex.getMessage());
        System.out.println("SQLState:  " + ex.getSQLState());
        System.out.println("ErrorCode: " + ex.getErrorCode());
      }
    }
  }
}