一个完善的班级网站的实现

				//conn.java
				package classnet;
				import java.sql.*;
				public class conn{
				  String sDBDriver="sun.jdbc.odbc.JdbcOdbcDriver";
				  String sConnStr="jdbc:odbc:ClassDB";
				  Connection connect=null;
				  ResultSet rs=null;
				  public conn(){
				      try{
				
				            Class.forName(sDBDriver);
				         }
				      catch(java.lang.ClassNotFoundException e){
				       System.err.print(e.getMessage());
				       }
				    }
				  public ResultSet executeQuery(String sql){
				      try{
				          connect=DriverManager.getConnection(sConnStr);
				          Statement stmt=connect.createStatement();
				          rs=stmt.executeQuery(sql);
				       }
				      catch(SQLException ex){
				       System.err.print(ex.getMessage());
				       }
				       return rs;
				    }
				  public int executeUpdate(String sql){
				  	int temp=0;
				      try{
				          connect=DriverManager.getConnection(sConnStr);
				          Statement stmt=connect.createStatement();
				          temp=stmt.executeUpdate(sql);
				       }
				      catch(SQLException ex){
				       System.err.print(ex.getMessage());
				       }
				       return temp;
				    }
				}