Retrieve values from database

Question

Hi,
one of the search form contains the select option for country , state and
distributor type.
the country drop down has 2 values - US and canada
the conditions needed to be satisfied are :
(1) if the country selected is US - then the states dropdown should only show the states that are associated with US in the table in the database(TABLE name is - "distributors")
and if country selected is Canada - then should show states in canada only
(2) if canada is selected in the country dropdown, the distributor type which has 2 values - stationary and automotive - should show only the stationary in the dropdown and not show the automotive
This is done with the LocateQueryServlet.java...can someone please tell me how this needs to be updates so that the above conditions are satisfied...
Attaching the code from LocateQueryServlet.java and the prolog.sql
--------------------------------------------------------------------------------------------------LocateQueryServlet.java
package com.dupont.refrigerants.distributorlocator;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import javax.ejb.CreateException;
import javax.naming.NamingException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.proxicom.util.MiscEJBFunctions;
* This servlet displays a query form for locating distributors. It relies on
* the 'countries', 'states' and 'types' tables in the database to fill its
* forms. If a table is empty, it doesn't display the corresponding select
* (pulldown) widget. This only displays the form fragment of HTML, and should
* be included in a complete page, probably with JSP or the like.
* XXX Currently, the form is populated when the servlet is initialized, which
* is a hack because I don't remember the appropriate j2ee idiom.
* @web.servlet name="queryServlet" display-name="Distributor Locator Query
* Servlet" description="Servlet that gets a query form for finding
* distributors in a given region"
* @web.servlet-mapping url-pattern="/queryServlet"
public class LocateQueryServlet extends HttpServlet {
     * Abstract class for converting a java object into
     * an option element for an HTML select form widget.
     private abstract static class Object2Option {
          * Gets the default option at the top of the select.
          * To have no default, override this to return the
          * empty string.
          * @return <code>>option selected='true' value=''<-- Select One -->/option<</code>
          public String getDefault() {
               return "<option selected='true' value=''>-- Select One --</option>";
          * The option element that represents the given info object.
          * @param o the info object
          * @return an unselected HTML option element.
          abstract public String getOptionFor(Object o);
          * Helper method for generating a select option element
          * with the given un-encoded value and text.
          * @param value
          * unencoded string to be passed as the form
          * value when selected
          * @param text
          * unencoded string to be displayed in the select
          * box pulldown
          * @return the concatenated and appropriately escaped
          * option element
          protected static String getOptionWith(String value, String text) {
               return "<option value='" + Utilities.webify(value, false) + "'>"
                         + Utilities.webify(text, false) + "</option>";
     * Function object for generating 'Country' select box items.
     private static class Object2CountryOption extends Object2Option {
          * Converts a CountryInformation object into an appropriate
          * HTML option element.
          public String getOptionFor(Object o) {
               CountryInformation c = (CountryInformation) o;
               return getOptionWith(c.getCode(), c.getName());
     * Function object for generating 'Distributor Type' select box items.
     private static class Object2DistributorTypeOption extends Object2Option {
          * Converts a DistributorTypeInformation object into an appropriate
          * HTML option element.
          public String getOptionFor(Object o) {
               DistributorTypeInformation c = (DistributorTypeInformation) o;
               return getOptionWith(String.valueOf(c.getId()), c.getDescription());
     * Function object for generating 'State/Province' select box items.
     private static class Object2StateOption extends Object2Option {
          * Converts a StateInformation object into an appropriate
          * HTML option element.
          public String getOptionFor(Object o) {
               StateInformation c = (StateInformation) o;
               return getOptionWith(c.getCode(), c.getName());
     private String countries;
     private String states;
     private String types;
     * Constructs a simple locate query servlet.
     public LocateQueryServlet() {
          super();
     * Generates an HTML select form widget for the given list of values.
     * @param formName the name of the widget for the HTML name attribute
     * @param values the values to convert into a list
     * @param factory the method for converting each value into an option.
     * @return the complete 'select' element
     private String generateSelectFor(String formName, List values,
               Object2Option factory) {
          StringBuffer sb = new StringBuffer();
          sb.append("<select name='").append(Utilities.webify(formName, false)).append("'>");
          sb.append(factory.getDefault());
          for (Iterator iter = values.iterator(); iter.hasNext();) {
               sb.append(factory.getOptionFor(iter.next()));
          sb.append("</select>");
          return sb.toString();
     * Initializes the servlet. Actually results in some queries getting run.
     * @param config
     * @throws ServletException
     public void init(ServletConfig config) throws ServletException {
          try {
               DistributorDBABeanHome distBean = (DistributorDBABeanHome) MiscEJBFunctions.getBeanHomeInterface(null, null, Utilities.EJB_DISTRIBUTOR_DBA_NAME);
               DistributorDBABean dists = distBean.create();
               this.countries = this.generateSelectFor("country", dists.getCountries(),
                         new Object2CountryOption());
               this.states = this.generateSelectFor("state", dists.getStates(),
                         new Object2StateOption());
               this.types = this.generateSelectFor("type", dists.getDistributorTypes(),
                         new Object2DistributorTypeOption());
          } catch (NamingException e) {
               throw new ServletException("Lookup of "
                         + Utilities.EJB_DISTRIBUTOR_DBA_NAME + " failed", e);
          } catch (CreateException e) {
               throw new ServletException(
                         "Error while creating distributor session bean", e);
          } catch (java.rmi.RemoteException e) {
               throw new ServletException(
                         "Error while initializing distributor locator", e);
     * Executes the HTTP request and return the appropriate HTML form fragment.
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     protected void doGet(HttpServletRequest request,
               HttpServletResponse response) throws ServletException, IOException {
          PrintWriter out = response.getWriter();
          response.setContentType("text/html");
          String action = request.getParameter("action");
          if (action == null) {
               action = "where-to-buy-results";
          } else {
               action = Utilities.webify(action, false);
          // Open form and table elements.
          out.println("<form id='distributorLocator' action='" + action + "' method='get'>"
                              + "<table width='100%' border='0' cellpadding='4' cellspacing='0'>");
          // buffer row
          //out.println("<tr><td colspan='2'><hr width='65%' size='1' noshade></td></tr>");
          // 'Country' row
          out.println("<tr><td><div align='right' class='formSubHead'>Country:</div></td>"
                              + "<td>" + this.countries + "</td></tr>");
          // 'States' row
          out.println("<tr><td><div align='right' class='formSubHead'>State/Province:</div></td>"
                              + "<td>" + this.states + "</td></tr>");
          // 'Application' row
          out.println("<tr><td><div align='right' class='formSubHead'>Application:</div></td>");
          out.println("<td>" + this.types + "</td></tr>");
          // or row
          out.println("<tr><td><div align='right'></div></td><td><em><strong>or</strong></em></td></tr>");
          // zip code row
          out.println("<tr><td><div align='right' class='formSubHead'>Zip Code/Postal Code: </div></td>"
                              + "<td><input id='zip' name='zip' type='text' /></td></tr>");
          // buffer row
          out.println("<tr><td colspan='2'><hr width='65%' size='1' noshade></td></tr>");
          // submit row
          out.println("<tr><td> </td><td><input type='submit' value='Find' /></td></tr>");
          // end table and form
          out.println("</table></form>");
prolog.sql
SET DEFINE OFF;
CREATE SEQUENCE distributor_id_seq START WITH 1 INCREMENT BY 1 NOMAXVALUE;
CREATE TABLE countries (code CHAR(2), name VARCHAR(254),
     CONSTRAINT country_pk PRIMARY KEY(code));
CREATE TABLE states (code CHAR(5), name VARCHAR(254), country CHAR(2),
     CONSTRAINT state_pk PRIMARY KEY(code),
     CONSTRAINT fk_country FOREIGN KEY(country) REFERENCES countries(code));
CREATE TABLE distributorTypes (id INTEGER, name VARCHAR(254),
     CONSTRAINT distributorType_pk PRIMARY KEY(id));
CREATE TABLE distributors
     (id INTEGER,
     name VARCHAR(254),
     zip VARCHAR(12),
     country CHAR(2),
     state CHAR(5),
     city VARCHAR(63),
     address1 VARCHAR(254),
     address2 VARCHAR(254),
     fax VARCHAR(32),
     phone VARCHAR(32),
     managers VARCHAR(254),
     type INTEGER,
     email VARCHAR(254),
     url VARCHAR(254),
     CONSTRAINT distributor_pk PRIMARY KEY(id),
     CONSTRAINT fk_dist_country FOREIGN KEY(country) REFERENCES countries(code),
     CONSTRAINT fk_dist_state FOREIGN KEY(state) REFERENCES states(code),
     CONSTRAINT fk_dist_type FOREIGN KEY(type) REFERENCES distributorTypes(id));
CREATE TABLE statesApply (state CHAR(5), distributor INTEGER,
     CONSTRAINT fk_apply_state FOREIGN KEY(state) REFERENCES states(code),
     CONSTRAINT fk_apply_distributor FOREIGN KEY(distributor) REFERENCES distributors(id));
INSERT INTO
          distributorTypes (id, name) VALUES (1, 'Air Conditioning - Stationary and Refrigeration');
INSERT INTO
          distributorTypes (id, name) VALUES (2, 'Air Conditioning - Automotive');
INSERT INTO
          countries (code, name) VALUES ('CA', 'Canada');
INSERT INTO
          countries (code, name) VALUES ('US', 'United States of America');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_AL', 'Alabama');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_KS', 'Kansas');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_ND', 'North Dakota');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_AK', 'Alaska');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_KY', 'Kentucky');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MP', 'N. Mariana Islands');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_AS', 'American Samoa');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_LA', 'Louisiana');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_OH', 'Ohio');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_AZ', 'Arizona');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_ME', 'Maine');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_OK', 'Oklahoma');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_AR', 'Arkansas');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MH', 'Marshall Islands');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_OR', 'Oregon');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_CA', 'California');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MD', 'Maryland');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_PW', 'Palau');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_CO', 'Colorado');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MA', 'Massachusetts');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_PA', 'Pennsylvania');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_CT', 'Connecticut');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MI', 'Michigan');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_PR', 'Puerto Rico');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_DE', 'Deleware');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MN', 'Minnesota');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_RI', 'Rhode Island');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_DC', 'District of Columbia');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MS', 'Mississippi');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_SC', 'South Carolina');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_FM', 'FS Micronesia');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MO', 'Missouri');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_SD', 'South Dakota');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_FL', 'Florida');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_MT', 'Montana');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_TN', 'Tennessee');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_GA', 'Georgia');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_NE', 'Nebraska');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_TX', 'Texas');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_GU', 'Guam');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_NV', 'Nevada');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_UT', 'Utah');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_HI', 'Hawaii');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_NH', 'New Hampshire');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_VT', 'Vermont');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_ID', 'Idaho');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_NJ', 'New Jersey');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_VI', 'Virgin Islands');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_IL', 'Illinois');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_NM', 'New Mexico');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_VA', 'Virginia');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_IN', 'Indiana');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_NY', 'New York');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_WA', 'Washington');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_IA', 'Iowa');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_NC', 'North Carolina');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_WV', 'West Virginia');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_WI', 'Wisconsin');
INSERT INTO
          states (country, code, name) VALUES ('US', 'US_WY', 'Wyoming');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_AB', 'Alberta');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_BC', 'British Columbia');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_MB', 'Manitoba');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_NB', 'New Brunswick');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_NL', 'Newfoundland and Labrador');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_NS', 'Nova Scotia');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_NT', 'Northwest Territories');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_NU', 'Nunavut');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_ON', 'Ontario');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_PE', 'Prince Edward Island');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_QC', 'Qu�bec');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_SK', 'Saskatchewan');
INSERT INTO
          states (country, code, name) VALUES ('CA', 'CA_YT', 'Yukon');
Any immediate help is truly appreciated.
Thanks in advance

Answer 1

I thank you for the link, it's something I've already done several times ....
actually this code tries to manage a key incremental, I am obliged to do that because I am in MS SQL Server and therefore what works for oracle does not work for SQL Server, which is why I want to do it manual, I also posted this in a previous post and I was asked to retrieve the field value by Code: Help please : dbsequence refresh on MS sql server
now admitting that it is not what I want to do and I have the following code:
if (it1.getValue () == null) (
Connection connection = ConnectionManager.getInstance (). GetConnection ();
Statement statement = connection.createStatement ();
ResultSet resultset = statement.executeQuery ("SELECT id FROM WHERE name = spider" it2.getValue + () + "");
while (resultSet.next ())
it1.setValue (resultSet.getInt (1));
BindingContainer getBindings bindings = ();
OperationBinding operationBinding bindings.getOperationBinding = ("Commit");
OperationBinding.execute Object result = ();
if (! operationBinding.getErrors (). isEmpty ()) (
return null;
else (
BindingContainer bindings2 getBindings = ();
OperationBinding operationBinding2 bindings2.getOperationBinding = ("Commit");
OperationBinding2.execute Object result = ();
if (! operationBinding2.getErrors (). isEmpty ()) (
return null;
What code ADF BC I will put in place of jdbc code