How does it connect to the database

can anyone pls tell me how the below coding connect to the database, and if i want to change to use other type of connection, which part of the coding should i use? thank
loginAction.jsp
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<html>
<head>

<title>Untitled Document</title>

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<LINK href="bios.css" type=text/css rel=stylesheet>

</head>
<body leftmargin="0" topmargin="0">
<%@ include file="useAndImport.jsp" %>
<%
String username = (String)session.getAttribute("username");
session.setMaxInactiveInterval(10*60);
boolean isLoggedIn=work.isUsable(username)?true:false;
%>
<table width="100%" height="22" border="0" cellpadding="0" cellspacing="0" bgcolor="#CC3300" class="statusloginsearch">
<tr>
          <SCRIPT LANGUAGE="JavaScript">





</script>
<form action=loginAction.jsp method=POST>
<td width="77%" valign="baseline" nowrap id="statusbar"> <% if (isLoggedIn)
out.println("<img src=images/active.gif width=10 height=15 align=middle><font size=1 color=white face=Verdana, Arial, Helvetica, sans-serif><b>Welcome, " + username + " </b></font>");%> <% if (!isLoggedIn) { %>
<font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Username:</font><font size="1" face="Verdana, Arial, Helvetica, sans-serif">
<input type=text name=username class="form" <%= work.getValueAttribute(username) %> >
<font color="#FFFFFF"> Password:</font>
<input type=password name=password class="form">
<input type="submit" name="action" value="Login" class="formbutton" onfocus="this.blur()" onmouseover="this.className='formbuttonover';" onmouseout="this.className='formbutton';" onmousedown="this.className='formbuttonover';" onmouseup="this.className='formbuttonover';">
<input type="reset" name="action" value="Reset" class="formbutton" onfocus="this.blur()" onmouseover="this.className='formbuttonover';" onmouseout="this.className='formbutton';" onmousedown="this.className='formbuttonover';" onmouseup="this.className='formbuttonover';">
<img src="images/question.gif" alt="what's this?" width="15" height="15" border="0" align="middle">
<% } %>
</font></td>
</form>
<td width="23%" valign="baseline" nowrap id="statusbar"> <div align="right">
<% if (isLoggedIn)
out.println("<form action=SignOut.jsp method=POST><input type=submit name=action value=Logout class=formbutton onfocus=this.blur() onmouseover=this.className='formbuttonover'; onmouseout=this.className='formbutton'; onmousedown=this.className='formbuttonover'; onmouseup=this.className='formbuttonover';></form> <a href=tour.jsp><img src=images/newtothissite.gif border=0 align=middle></a>");%>
  </div></td>
</tr>
</table>
<table width="650" border="0" cellspacing="4" cellpadding="1">
<tr>
<td>
<table width="580" border="0">
<tr>
<td><strong><font color="#CCCCCC" size="+2" face="Arial, Helvetica, sans-serif">ERROR</font></strong></td>
</tr>
</table>
<%-- loginAction.jsp --%>
<%
String username1 = request.getParameter("username");
String password=request.getParameter("password");
boolean isUsername=work.isUsable(username1);
boolean isPassword=work.isUsable(password);
String usernameQuoted=work.getSingleQuoted(username1);
String usernameParam = work.makeUrlParameter("username",username1);
ResultSet resultset;
if(isUsername && isPassword) {
resultset=db.executeQuery
("SELECT * FROM users WHERE USERNAME = " + usernameQuoted);
if (resultset.next() &&
resultset.getString("password").equals(password))
out.println("<font color=green>You are logged on.</font>");
session.setAttribute("username", username1);
String accessLevel = resultset.getString("access_level");
     session.setAttribute("access", accessLevel);
     if(accessLevel.equals("0"))
     response.sendRedirect("Welcome.jsp");
     else if(accessLevel.equals("3"))
     response.sendRedirect("Admin.jsp");
%>
<%
} else {
out.print(work.tryAgain(
"<font size=2 color=red face=Verdana, Arial, Helvetica, sans-serif><b>Your username and/or password are incorrect.</b>",
"Login.jsp"+usernameParam));
} else {
out.print(work.tryAgain(
"<font size=2 color=red face=Verdana, Arial, Helvetica, sans-serif><b>Your login information is incomplete.",
"Login.jsp"+usernameParam));
%>

</td>
</tr>
</table>
</body>
</html>
useAndImport.jsp
<%-- thingsToUseAndImport.jsp --%>
<jsp:useBean id="db"
class="kw.search.DbAccess"
scope="application"/>
<jsp:useBean id="work"
class="kw.search.Worker"
scope="application"/>
<jsp:useBean id="dataB"
class="bb.messageBoard.DataB"
scope="application"/>
<jsp:useBean id="forum"
class="bb.messageBoard.Forum"
scope="application"/>
<%@ page import="java.text.DateFormat, java.util.Vector, java.io.*" %>
DbAccess.java
package kw.search;
import java.sql.*;
public class DbAccess implements java.io.Serializable {
private Connection connection;
private Statement statement;
String db = "btc";
String user = "javauser";
String password = "javauser";
String dbUrl = "jdbc:mysql://localhost:3306/" +db;
//dbUrl = "jdbc:mysql://localhost:3306/"+db;
public DbAccess ()
throws ClassNotFoundException, SQLException
Class.forName("com.mysql.jdbc.Driver");
//connection = DriverManager.getConnection ("jdbc:mysql://localhost:3306/btc?"+"user=javauser&password=javauser");
connection = DriverManager.getConnection
(dbUrl+"?user="+user+"&password="+password);
connection.setAutoCommit(false);
statement = connection.createStatement();
public void executeUpdate(String sqlCommand)
throws SQLException
statement.executeUpdate(sqlCommand);
public ResultSet executeQuery(String sqlCommand)
throws SQLException
return statement.executeQuery(sqlCommand);
public void commit() throws SQLException
connection.commit();
public void rollback() throws SQLException
connection.rollback();
protected void finalize() throws SQLException
statement.close();
connection.close();
}

This section of your code makes the connection:
public DbAccess ()
throws ClassNotFoundException, SQLException
Class.forName("com.mysql.jdbc.Driver");
//connection = DriverManager.getConnection ("jdbc:mysql://localhost:3306/btc?"+"user=javauser&password=javauser");
connection = DriverManager.getConnection
(dbUrl+"?user="+user+"&password="+password);
connection.setAutoCommit(false);
statement = connection.createStatement();
public void executeUpdate(String sqlCommand)
throws SQLException
statement.executeUpdate(sqlCommand);
public ResultSet executeQuery(String sqlCommand)
throws SQLException
return statement.executeQuery(sqlCommand);
public void commit() throws SQLException
connection.commit();
public void rollback() throws SQLException
connection.rollback();
}

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