连接MySQl的JavaBean

以下为引用的内容：
package mysql;

import java.sql.*;

public class MySqlCon
{
private String DbName = "";
private String pass = "";
private String url = "";
private Connection con = null;
private Statement stmt = null;
private ResultSet rs = null;

public MySqlCon()
{
}

public void setDbName (String name)
{
this.DbName = name;
}
public void setPass (String pass)
{
this.pass = pass;
}

public void BulidCon()
{
try
{
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
url ="jdbc:mysql://localhost/"+DbName+"?user=root&password="+pass+"&useUnicode=true&characterEncoding=gb2312";
con= DriverManager.getConnection(url);
stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
}
catch (Exception e)
{
}
}

public ResultSet selectLog(String sql)
{
try
{
BulidCon();
rs = stmt.executeQuery(sql);
}
catch(Exception e)
{
System.out.println(e.toString());
}
return rs;
}

public void updateLog(String sql)
{
try
{
BulidCon();
stmt.executeUpdate(sql);
}
catch (Exception e)
{
}
}

public void close()
{
try
{
con.close();
stmt.close();
}
catch (SQLException e)
{
}
}

}