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$conn= mysql_connect("127001", "mysqluser", "mysqlpass"); mysql_select_db("world"); $result= mysql_query("SELECT cicityName, cicountryCode," "cocountryName, ciregionCode, reregionName, " "cipopulation, cilatitude, cilongitude " "FROM cities ci JOIN regions re ON " "cicountryCode=reCountryCode AND ciregionCode=reregionCode " "JOIN countries co ON cicountryCode=cocountryCode " "WHERE cicityName LIKE '%{$desiredCity}%' " "ORDER BY cicityName, cocountryName, reregionName "); echo '< xml version="10" encoding="UTF-8" >'"\n"; echo '<cities>'"\n"; while ($row= mysql_fetch_assoc($result)) { echo ' <city name="'htmlspecialchars($row['cityName'])'">'"\n"; echo ' <country code="'$row['countryCode']'" '; echo 'name="'htmlentities($row['countryName'])'"/>'"\n"; echo ' <region code="'$row['regionCode']'" '; echo 'name="'htmlentities($row['regionName'])'"/>'"\n"; echo ' <coords>'"\n"; echo ' <lat>'$row['latitude']'</lat>'"\n"; echo ' <lon>'$row['longitude']'</lon>'"\n"; echo ' </coords>'"\n"; if ($row['population']>0) { echo ' <pop>'$row['population']'</pop>'"\n"; } echo ' </city>'"\n"; } echo '</cities>'"\n"; >
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Leaving aside (for the moment) the matter of actually getting the XML string, let s study how to process it in GWT
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To use the XML library, you have to add <inherits name="comgooglegwtxml XML"/> to the gwtxml file of your application You convert the string to a XML document by using XMLParserparse() and access its root (<cities>, in this case) with the getDocumentElement( ) method; after this, you are ready to walk through the XML
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GWT s XML parser is based on the browser s own JavaScript DOM routines (This will affect our tests in 13, Testing Your GWT Application ; we won t be able to test with just JUnit any XML using form) Browser parsers often create empty text nodes for each tab or line break, and unless you remove them, your code will encounter unexpected elements, which might even cause your algorithm to fail; always use removeWhitespace() to clean up the generated document before attempting to process it Another quirk: if you expect to process CDATA sections, you ll need to verify whether your browser supportsCDATASection(); if not, those sections will become text nodes, and your XML processing logic will have to vary5 Finally, note that your XML processing code will usually be full of casts; it s up to you to decide what kind of nodes you will process! The Presenter code for our form is as follows The logic also uses HashMap<Integer, ClientCityData> cityList to store the cities data, for later usage when updating the server
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void displayCities(String xmlCities) { clearCities(); if (!xmlCitiesisEmpty()) { final Document xmlDoc = XMLParserparse(xmlCities); final Element root = xmlDocgetDocumentElement(); XMLParserremoveWhitespace(xmlDoc);
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As we said, you must remember to removeWhitespace() from the produced Document; otherwise, you ll have to deal with plenty of empty nodes
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final NodeList cities = rootgetElementsByTagName("city"); for (int i = 0; i < citiesgetLength(); i++) { final Element city = (Element) citiesitem(i); String cityName = citygetAttributeNode("name")getValue(); final Element country = (Element) citygetElementsByTagName("country") item(0); String countryCode = countrygetAttributeNode("code")getValue(); String countryName = countrygetAttributeNode("name")getValue(); final Element state = (Element) citygetElementsByTagName("state") item(0); String stateCode = stategetAttributeNode("code")getValue(); String stateName = stategetAttributeNode("name")getValue();
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5 Keep in mind that GWT s XML parser depends on the underlying browser s parser, so you should be extra careful not to write any code that could depend on functionality not common to all browsers!
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int population = 0; Element popElem = (Element) citygetElementsByTagName("pop")item(0); if (popElem != null) { population = IntegerparseInt(popElemgetFirstChild()getNodeValue()); } Element coords = (Element) citygetElementsByTagName("coords")item(0); Element lat = (Element) coordsgetElementsByTagName("lat")item(0); Element lon = (Element) coordsgetElementsByTagName("lon")item(0); float latitude = FloatparseFloat(latgetFirstChild()getNodeValue()); float longitude = FloatparseFloat(longetFirstChild()getNodeValue());
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After having collected the complete city data, we just have to show it onscreen, by using the setCityData() method and add it to cityList
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getDisplay()setCityData(i + 1, cityName, countryName, stateName, population); /* * Given the usage of cityList, we could have set latitude * and longitude to 00, and it would have worked all the same */ cityListput(i + 1, new ClientCityData(countryCode, stateCode, cityName, "", population, latitude, longitude)); } } }
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Notice the use of getElementsByTagName() to get an array of elements, getAttributeNode() to get at attributes, and getNodeValue() to get the value associated with a node We still have to see how to produce XML (for our city updating service consumes XML too) but let s first finish the matter of getting the data from the server, with two variants
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