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CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
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The remainder of the block creates the visible text field and Add button: <input type="text" name="entry" /> <br /> <input type="submit" value="Add" /> </form> </p> </xsl:otherwise> </xsl:choose> The form appears within the <xsl:choose> element, so it only displays if a valid record exists. Figure 13-11 shows the form as it appears when working at the city level.
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Figure 13-11. Adding a new city
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addnew.php
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If you add new details, the form action calls the addnew.php script. This script inserts the new record into the appropriate table in the database. I ll break down the page and discuss each section. To start with, the page includes weather.php to access the database: < php include_once 'weather.php';
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CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
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It then retrieves the details from the form, including the values in the hidden fields: $into = $_POST['into']; $current = $_POST['current']; $parent = $_POST['parent']; $entry = $_POST['entry']; The page tests to see that users have entered details into the form: if (strlen(trim($entry)) > 0) { If so, it uses the $into variable to determine the appropriate INSERT statement and stores it in the variable $sql: switch ($into) { case 'continent': $sql = 'INSERT into continent (continent) VALUES ("' . htmlspecialchars($entry,ENT_QUOTES) . '")'; break; case 'country': $sql = 'INSERT into country (country, countryContinentID) VALUES ("' . htmlspecialchars($entry,ENT_QUOTES) . '",' . $parent . ')'; break; case 'area': $sql = 'INSERT into area (area, areaCountryID) VALUES ("' . htmlspecialchars($entry,ENT_QUOTES) . '",' . $parent . ')'; break; case 'city': $sql = 'INSERT into city (city, cityAreaID) VALUES ("' . htmlspecialchars($entry,ENT_QUOTES) . '",' . $parent . ')'; break; default: $sql = ''; break; } } else { $sql =''; } Finally, the code checks for a SQL statement, in which case the length of the $sql variable must be greater than 0. It then inserts the new record and redirects to the previous navigation position:
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CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
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if (strlen($sql) > 0) { mysql_query($sql) or die(mysql_error()); } header('Location: index.php ' . $current . '=' . $parent); > The $current variable contains the previous navigation level, while $parent contains the id of that entry. I ve now worked through the code that builds the site navigation. The remainder of the application handles the weather details. The mk_weather.php, weather.xsl, and addweather.php scripts deal with the weather details. The application uses the same approach as it did with the navigation. The mk_weather.php script generates the weather XML, which weather.xsl transforms into XHTML. The addweather.php page allows users to add new weather details.
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mk_weather.php
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The mk_weather.php page generates the XML document containing current weather details. It uses the following template: < xml version="1.0" encoding="UTF-8" > <weather> <city id=""> </city> <temperature> <minimum></minimum> <maximum></maximum> </temperature> <outlook>hot</outlook> <weathertypes> <type id=""> </type> </weathertypes> </weather> There are three possibilities for the structure of the XML document that the application generates: 1. There is no current weather report. 2. The values in the querystring change and cause an error. 3. There is a current weather report. I ll work through each scenario.
CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
Scenario 1: No Current Weather Reports In the first scenario, the selected city has no current weather reports. Figure 13-12 shows how this appears to users.
Figure 13-12. There is no current weather report to display. The XML document describing the weather in this scenario would appear as follows: < xml version="1.0" encoding="UTF-8" > <weather> <city id="4">Perth</city> <weathertypes> <type id="1">hot</type> <type id="2">sunny</type> <type id="3">windy</type> <type id="4">cloudy</type> <type id="5">rain</type> <type id="6">rainstorms</type> <type id="7">snow</type> <type id="8">snowstorms</type> </weathertypes> </weather> The <weather> element is the document element. This element includes the <city> element, which contains the city name as text and an attribute with the id from the database.
CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
The page also contains a form that allows users to add a new weather report. To make life easier, the application provides a list of weather types in a drop-down list. This information comes from the <weathertypes> element. Scenario 2: Changing Querystring Variables The second possibility occurs when users edit the querystring to add an invalid city code. This would produce the following XML document: < xml version="1.0" encoding="UTF-8" > <weather> <city>Error</city> <error>You appear to have selected an invalid city</error> </weather> This document provides users with an error message. Scenario 3: Current Weather Reports Available The final scenario shows a current weather report for the selected city. The XML document needs to include the current weather conditions with the possible weather types: < xml version="1.0" encoding="UTF-8" > <weather> <city id="4">Perth</city> <temperature> <minimum>20</minimum> <maximum>35</maximum> </temperature> <outlook>hot</outlook> <weathertypes> <type id="1">hot</type> <type id="2">sunny</type> <type id="3">windy</type> <type id="4">cloudy</type> <type id="5">rain</type> <type id="6">rainstorms</type> <type id="7">snow</type> <type id="8">snowstorms</type> </weathertypes> </weather> The <temperature> element provides the minimum and maximum temperatures. The <outlook> element is the current outlook for the city. It contains one of the predefined weather types. Now that you ve seen the XML document structures, I ll look at the code that builds these structures from the database.
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