databaseviewer.java~2~

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package manager;

import com.sun.rowset.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.sql.rowset.*;

class ResultSetFrame extends JFrame
{
  public ResultSetFrame()
  {
    super("ResultSet");
    setSize(600,200);
    setLocation(250, 250);

    tableNames=new JComboBox() ;
    tableNames.addActionListener(new ActionListener() {
                 public void actionPerformed(ActionEvent e) {
                   try{
                     if(scrollPane!=null) remove(scrollPane);
                     String tableName=(String)tableNames.getSelectedItem();
                     if(rs!=null) rs.close();
                     String query="SELECT * FROM "+tableName;
                     rs=stat.executeQuery(query);
                     if(scrolling) model=new ResultSetTableModel(rs);
                     else {
                       CachedRowSet crs=new CachedRowSetImpl();
                       crs.populate(rs);
                       model=new ResultSetTableModel(crs) ;
                     }
                     JTable table=new JTable(model) ;
                     scrollPane=new JScrollPane(table) ;
                     add(scrollPane,BorderLayout.CENTER);
                     validate();
                   }
                   catch(SQLException ee){}
                 }
               });
    JPanel panel=new JPanel() ;
    panel.add(tableNames) ;
    add(panel,BorderLayout.NORTH);

    try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");}
    catch(ClassNotFoundException ce){ce.printStackTrace();}
    try{
      con=DriverManager.getConnection(
          "jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ=order.mdb");
      DatabaseMetaData meta=con.getMetaData();
      if(meta.supportsResultSetType(ResultSet.TYPE_SCROLL_INSENSITIVE))
      {
        scrolling=true;
        stat=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
            ResultSet.CONCUR_READ_ONLY);
      }
      else
      {
        stat=con.createStatement() ;
        scrolling=false;
      }
      ResultSet tables=meta.getTables(null,null,null,new String[]{"TABLE"}) ;
      while(tables.next())
        tableNames.addItem(tables.getString(3));
      tables.close();
    }
    catch(SQLException sqlE){}
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        try{
          if(con!=null) con.close();
        }
        catch(SQLException sqle){}
      }
    });
  }

  private JScrollPane scrollPane;
  private ResultSetTableModel model;
  private JComboBox tableNames;
  private ResultSet rs;
  private Connection con;
  private Statement stat;
  private boolean scrolling;
}

class ResultSetTableModel extends AbstractTableModel
{
  public ResultSetTableModel(ResultSet aResult)
  {
    rs=aResult;
    try{
      rsmd=rs.getMetaData();
    }
    catch(SQLException e){}
  }
  public String getColumnName(int c)
  {
    try{
      return rsmd.getColumnName(c+1);
    }
    catch(SQLException e)
    {
      return "";
    }
  }
  public int getColumnCount()
  {
    try{
      return rsmd.getColumnCount();
    }
    catch(SQLException e)
    {
      return 0;
    }
  }
  public Object getValueAt(int r,int c)
  {
    try{
      rs.absolute(r+1);
      return rs.getObject(c+1);
    }
    catch(SQLException e)
    {
      return null;
    }
  }
  public int getRowCount()
  {
    try{
      rs.last();
      return rs.getRow();
    }
    catch(SQLException e)
    {
      return 0;
    }
  }
  private ResultSet rs;
  private ResultSetMetaData rsmd;
}