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//The < button
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if(currentRecordNumber > 0){
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currentRecordNumber--;
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showRecord(currentRecordNumber);
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if(etargetequals(button2)){
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//The Add record button
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Element elem = dcreateElement(new String("SIGHTING"), ElementELEMENT);
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Element t1 = dcreateElement(new String("BIRD"), ElementELEMENT);
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Element x1 = dcreateElement(null, ElementPCDATA);
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x1setText(text1getText());
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t1addChild(x1, null);
Element t2 = dcreateElement(new String("DATE"), ElementELEMENT);
Element x2 = dcreateElement(null, ElementPCDATA);
x2setText(text2getText());
t2addChild(x2, null);
elemaddChild(t1,null);
elemaddChild(t2,null);
dgetRoot()addChild(elem, null);
maxRecordNumber++;
if(etargetequals(button3)){
//The Save database button
FileOutputStream outstream = null;
try {
outstream = new FileOutputStream("birdsxml");
catch (javaioIOException ex) {
Systemoutprintln("Could not create file input stream");
dsave(outstream);
try {
outstreamclose();
catch (javaioIOException ex) {
Systemoutprintln("IO exception");
if(etargetequals(button4)){
//The > button
if(currentRecordNumber < maxRecordNumber){
currentRecordNumber++;
showRecord(currentRecordNumber);
return true;
void showRecord(int recordNumber)
Element root = dgetRoot();
Element elem = null, elem2 = null;
Enumeration enum = rootgetChildren();
for(int index = 0; index <= recordNumber; index++){
elem = (Element)enumnextElement();
Enumeration enum2 = elemgetChildren();
for(int index = 0; index < 2; index++){
elem2 = (Element)enum2nextElement();
if (elem2getTagName()equals("BIRD")) {
text1setText(elem2getText());
if (elem2getTagName()equals("DATE")) {
text2setText(elem2getText());
class birdsFrame extends Frame
public birdsFrame(String str)
super (str);
public boolean handleEvent(Event evt)
switch (evtid)
case EventWINDOW_DESTROY:
dispose();
Systemexit(0);
return true;
default:
return superhandleEvent(evt);
Listing 54 birdsxml < XML version = "10" > <!DOCTYPE DOCUMENT [ <!ELEMENT DOCUMENT (SIGHTING)*>
<!ELEMENT SIGHTING (BIRD,DATE)> <!ELEMENT BIRD (#PCDATA)> <!ELEMENT DATE (#PCDATA)> ]> <DOCUMENT> <SIGHTING> <BIRD> Robin </BIRD> <DATE> March 2 </DATE> </SIGHTING> <SIGHTING> <BIRD> Sparrow </BIRD> <DATE> April 10 </DATE> </SIGHTING> <SIGHTING>
<BIRD> Eagle </BIRD> <DATE> June 23 </DATE> </SIGHTING> <SIGHTING> <BIRD> Owl </BIRD> <DATE> July 11 </DATE> </SIGHTING> <SIGHTING> <BIRD> Finch </BIRD> <DATE> August 3 </DATE>
</SIGHTING> </DOCUMENT> In the next database example, we'll see how to search through a database for a particular record; searching for records is an important database function, and we'll take a look at the process now
The searcher Example
In this example, searcher, we'll see how to search through a database XML document for a particular record We can use the + document we developed earlier (renamed searcherxml for this example): < XML version = "10" >
<!DOCTYPE DOCUMENT [
<!ELEMENT DOCUMENT (NAME)*>
<!ELEMENT NAME (LASTNAME, FIRSTNAME)>
<!ELEMENT LASTNAME (#PCDATA)>
<!ELEMENT FIRSTNAME (#PCDATA)>
<DOCUMENT>
<NAME>
<LASTNAME>Franklin</LASTNAME>
<FIRSTNAME>Tom</FIRSTNAME>
</NAME>
<NAME>
<LASTNAME>Guertin</LASTNAME>
<FIRSTNAME>Phoebe</FIRSTNAME>
</NAME>
<NAME>
<LASTNAME>Johnson</LASTNAME>
<FIRSTNAME>Frank</FIRSTNAME>
</NAME>
<NAME>
<LASTNAME>Tomlin</LASTNAME>
<FIRSTNAME>Brenda</FIRSTNAME>
</NAME>
<NAME>
<LASTNAME>Edwards</LASTNAME>
<FIRSTNAME>Tina</FIRSTNAME>
</NAME>
</DOCUMENT>
We can let the user search through this database for a match to one of the fields, such as the <FIRSTNAME> field When the user starts the application, we present them with this window: If the user is searching for a record in which the first name is +, they can enter that name in the lower text field this way: When they press the Search for this first name button, we find the record in which the first name is Tom and display that record this way: We will put this example to work now As in the previous two examples, we start by creating the window we'll use, the applet we'll insert in the window, install the applet and call its + method, and add the controls we'll use in the init() method Finally, we read the searcherxml document Note that we set the variable maxRecordNumber to the number of records in the XML document when we load the document: import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javaawt*;
import javanet*;
import javaappletApplet;
public class searcher extends Applet{
static String fileName;
Label firstNameLabel, lastNameLabel;
TextField text1, text2, text3;
Button button1;
Document d;
int maxRecordNumber = 0;
public static void main(String args[])
searcherFrame frame = new searcherFrame("The searcher application");
frameshow();
framehide();
frameresize(320, 300);
searcher applet = new searcher();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
public void init(){
firstNameLabel = new Label("First Name:");
add(firstNameLabel);
text1 = new TextField(24);
add(text1);
lastNameLabel = new Label("Last Name:");
add(lastNameLabel);
text2 = new TextField(24);
add(text2);
button1 = new Button("Search for this first name:");
add(button1);
text3 = new TextField(10);
add(text3);
URL url = null;
try {
url = new URL("file:////c://xml//searcher//searcher
xml");
catch (MalformedURLException e1) {
Systemoutprintln("Cannot create url for: " + fileName);
Systemexit(0);
d = new Document();
try {
dload(url);
catch (ParseException e3) {
dreportError(e3, Systemout);
if (d != null) {
maxRecordNumber = dgetRoot()numElements() - 1;
Now we'll write the + method to handle the actual search process First, we make sure the user has pressed the Search button, button1: public boolean action (Event e, Object o){
if(etargetequals(button1)){
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