高手，请帮帮我！帮我看看这个javabean这么写对不对,谢谢!

高手，请帮帮我！帮我看看这个javabean这么写对不对,谢谢!如果不对请指出


opendb.java

package opendb;

import java.sql.*;

public class opendb {
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "jdbc:microsoft qlserver://localhost:1433;DatabaseName=zhang";
Connection conn = null;
ResultSet rs = null;
Statement stmt=null;
public opendb()
{
try
{
Class.forName(sDBDriver);
}
catch (java.lang.ClassNotFoundException e)
{
System.err.println("opendb(): " + e.getMessage());
}
}
public void getConnection()
{
try{
conn=DriverManager.getConnection(sConnStr,"sa","");
}catch(Exception e){}
}


public ResultSet executeQuery(String sql)
{
try
{
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
catch (SQLException ex)
{
System.err.println("aq.executeQuery: " + ex.getMessage());
}
return rs;
}

public void executeUpdate(String sql)
{

try
{

stmt = conn.createStatement();
stmt.executeUpdate(sql);
}
catch (SQLException ex) {
System.err.println("aq.executeQuery: " + ex.getMessage());
}


}
public void close()
{
try{
rs.close();
stmt.close();
conn.close();
}catch(Exception e){}
}

}