Kindly Help Me in This Servlet...

the error is.. Can not issue data manipulation statements with executeQuery(). i cant.. update my database and also i cant delelete..
what wrong in this servlet..
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Servlet1 extends HttpServlet
Connection con = null;
Statement stat = null;
ResultSet result = null;
public void init(ServletConfig config) throws ServletException
super.init(config);
public void destroy()
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
try
     out.println("<html>");
out.println("<head></head>");
out.println("<body>");
String table = "Employee";
String field1 = "Firstname";
String field1_label = "First Name";
String field2 = "Lastname";
String field2_label = "Last Name";
String field3 = "Middlename";
String field3_label = "Middle Name";
String db_host = "localhost";
String db_user = "root";
String db_pass = "root";
String db = "murach?";
String query = "";
String url = "jdbc:mysql://"+db_host+"/" + db;
String driver = "org.gjt.mm.mysql.Driver";
Class.forName(driver);
con = DriverManager.getConnection(url, db_user, db_pass);
stat = con.createStatement();
String sort = request.getParameter("sort")+"";
String read = request.getParameter("read")+"";
String update = request.getParameter("update")+"";
String delete = request.getParameter("delete")+"";
String field1_value = request.getParameter("field1_value")+"";
String field2_value = request.getParameter("field2_value")+"";
String field3_value = request.getParameter("field3_value")+"";
out.println("<html>");
out.println("<head><title>Products Update</title></head>");
out.println("<script language=\"JavaScript\">");
out.println("function focusform() {");
out.println("document.forms[1].field1_value.focus();");
out.println("}");
out.println("</script>");
out.println("<head>");
out.println("<center><body bgcolor=pink OnLoad=\"focusform()\">");
if (!update.equals("null"))
     //query = "replace into" + table + "("+ field1 +",'"+ field2 +",'"+ field3 +"') values ("+ field1_value+",'"+ field2_value +",'"+field3_value+"')" ;
     query = "update" + table + " set " + field1 + "=\"" + field1_value + "\" , " + field2 + "=\"" + field2_value + "\"," + field3 + "=\"" + field3_value + "\"where Code="+ update;
     result = stat.executeQuery(query);
if (!delete.equals("null"))
     query = "delete from " + table + " where Code=" + delete;
if (!query.equals(""))
     result = stat.executeQuery(query);
query = "select * from " + table;
if (sort.equals("null")) sort=field1;
if (sort.equals("Code")) query+=" order by Code";
if (sort.equals(field1)) query+=" order by " + field1;
if (sort.equals(field2)) query+=" order by " + field2;
if (sort.equals(field3)) query+=" order by " + field3;
if (!read.equals("null"))
query = "select * from " + table + " where Code=" + read;
result = stat.executeQuery(query);
out.println("<table border=1 cellspacing=0>");
out.println("<tr>");
out.println("<td><a href=\"" + request.getRequestURL() + "?sort=Code\">Code</a></td>");
out.println("<td><a href=\"" + request.getRequestURL() + "?sort=" + field1 + "\">" + field1_label + " </a></td>");
out.println("<td><a href=\"" + request.getRequestURL() + "?sort=" + field2 + "\">" + field2_label + "</a></td>");
out.println("<td><a href=\"" + request.getRequestURL() + "?sort=" + field3 + "\">" + field3_label + "</a></td>");
out.println("<td colspan=2>");
out.println("</td>");
out.println("</tr>");
if (read.equals("null"))
while(result.next())
out.println("<tr>");
out.println("<td>");
out.print(result.getString(1));
out.println("</td>");
out.println("<td>");
out.print(result.getString(2));
out.println("</td>");
out.println("<td>");
out.print(result.getString(3));
out.println("</td>");
out.println("<td>");
out.print(result.getString(4));
out.println("</td>");
out.println("<td><a href=\"" + request.getRequestURL() + "?read=" + result.getString(1) + "\">Edit</a></td>");
out.println("<td><a href=\"" + request.getRequestURL() + "?delete=" + result.getString(1) + "\">Delete</a></td>");
out.println("</tr>");
else
while(result.next())
out.println("<form action=\"" + request.getRequestURL() + "\" method=\"post\"> " + "\t <input type=hidden name=update value=" + result.getString(1) + ">");
out.println("<tr>");
out.println("<td>");
out.print(result.getString(1));
out.println("</a></td>");
out.println("<td><input type=text size=10 name=field1_value value=" + result.getString(2) + "></td>");
out.println("<td><input type=text size=10 name=field2_value value=" + result.getString(3) + "></td>");
out.println("<td><input type=text size=15 name=field3_value value=" + result.getString(4) + "></td>");
out.println("<td colspan=2 align=center><input type=submit value=\" Do it! \"></td>");
out.println("</tr>");
out.println("</form> ");
stat.close();
con.close();
out.println("</table>");
catch(ClassNotFoundException e)
     out.println("Couldn't load database driver: " + e.getMessage());
catch(SQLException e)
     out.println("SQLException caught: " + e.getMessage());
finally
     try
          if (con != null) con.close();
     catch (SQLException ignored)
out.close();
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException
processRequest(request, response);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException
processRequest(request, response);
public String getServletInfo()
return "4 Column ProductUpdate Java Servlet using MySQL.";
hope you can help me about this..

what is the entry in the tnsnames.ora for HRMIS? I am accessing thru client machine :
In tnsnames.ora file
HRMIS =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.11.93)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = hrmis)
HRMIS_HRMIS =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = hrmis)(PORT = 1521))
(CONNECT_DATA =
(SID = hrmis)
(SERVER = DEDICATED)
In sqlnet.ora
# sqlnet.ora Network Configuration File: D:\Oracle\product\10.1.0\Client_1\network\admin\sqlnet.ora
# Generated by Oracle configuration tools.
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

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Help me with this servlet....

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excuse me if i repeat a my old post,but now i have more clear ideas about problems.
I've developed an authorization filter in my jsf application that when a page is loaded try to find a visit object in the session,if it doesn't find show login page.
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</filter-mapping>
<servlet>
<servlet-name>FacesServlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/nomedb</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>and index.jsp
<jsp:forward page="/Login.jsf"/>

Thanks....
i've moved all the jsp pages in /pages/protected except Login.
I've added to web.xml
<filter-mapping>
<filter-name>AuthorizationFilter</filter-name>
<url-pattern>/pages/protected/*</url-pattern>
</filter-mapping>
and so filter acts,but when i logged in i see Menu,i select a choice and all the next pages are ever blank!!
I stop the filter and each page compares!
Why?
Can you help me?
A second question is:
what does mean an url like /faces/*?
Each .jsf requests?Or faces is seen as a folder ?
Thanks very much

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